MEG 2009 Run

Peter-Raymond KettlePeter-Raymond Kettle MEG Review February 2010MEG Review February 2010 11

MEG 2009 RunMEG 2009 Run

Run Run

Coordinator’sCoordinator’s

View!View!


Review 2009Review 2009Review 2009Review 2009Successfully finished first MEG Physics Run Successfully finished first MEG Physics Run (Sept. – Dec. 2008)(Sept. – Dec. 2008)

However – Major Issues to be Investigated/Rectified:However – Major Issues to be Investigated/Rectified:

• DC: high-voltage stability (He-diffusion problem)DC: high-voltage stability (He-diffusion problem)

• Calorimeter: LXe light-yield LY (reduced absolute LY Calorimeter: LXe light-yield LY (reduced absolute LY ) ) • Calorimeter: PMT gain-drift (reduced gain with >Calorimeter: PMT gain-drift (reduced gain with >QQbeambeam))

• TC: fully functioning fibre detector (new APD readout)TC: fully functioning fibre detector (new APD readout)

APD - electronicsAPD - electronicsAPD - electronicsAPD - electronics

LXe - calibrationLXe - calibrationLXe - calibrationLXe - calibration

DC – HV stabilityDC – HV stabilityDC – HV stabilityDC – HV stability


Situation Spring 2009Situation Spring 2009Post Review February 2009:Post Review February 2009:

Back to “Square One” – Back to “Square One” – TOTAL Detector DISMANTLED TOTAL Detector DISMANTLED for Maintenance/Repair /Improvementfor Maintenance/Repair /Improvement Shutdown 2008 / 2009 Shutdown 2008 / 2009 ++ Kottmann Expt. Front-part Kottmann Expt. Front-part E5E5 Scheduled until Scheduled until mid-July!mid-July!

Back to “Square One” – Back to “Square One” – TOTAL Detector DISMANTLED TOTAL Detector DISMANTLED for Maintenance/Repair /Improvementfor Maintenance/Repair /Improvement Shutdown 2008 / 2009 Shutdown 2008 / 2009 ++ Kottmann Expt. Front-part Kottmann Expt. Front-part E5E5 Scheduled until Scheduled until mid-July!mid-July!

New APD front-end New APD front-end electronicselectronics+ control interface+ control interface(reduced noise (reduced noise + faster -> trig)+ faster -> trig)

Dismantling of all DCs Dismantling of all DCs New anode-printsNew anode-prints + wires ++ wires +extensive extensive tests “aquarium”tests “aquarium”& “He-cabin” +…& “He-cabin” +…(HV stability(HV stability> > ))

Calorimeter –> cooling-power (<LN(<LN22))

Modify purification System – new Getter (< contamination)(< contamination)& Liquid Pump (LY)(LY)


Further planned Implementations 2009Further planned Implementations 2009(I) Upgrading from DRS2 to DRS4(I) Upgrading from DRS2 to DRS4

• differential i/pdifferential i/p• internal clock & synchronizationinternal clock & synchronization• on-board timing calibrationon-board timing calibration• 3.2 GSPS possible XEC-1.6GHz 3.2 GSPS possible XEC-1.6GHz DC DC 0.5 GHz but >0.7GHz 0.5 GHz but >0.7GHz

(2) Change of degrader thickness at BTS focus(2) Change of degrader thickness at BTS focus• 300300m Mylar to 200m Mylar to 200m Mylarm Mylar• to match 6 % air contamination to match 6 % air contamination content in COBRA (previously variable)content in COBRA (previously variable) & centre stopping distribution in target& centre stopping distribution in target

One main aspect which ran in parallel during the first One main aspect which ran in parallel during the first half of the year was the ANALYSIS of 2008 DATA!!!!half of the year was the ANALYSIS of 2008 DATA!!!!


Schedule 2009Schedule 2009

• Kottmann et al. beam time until Kottmann et al. beam time until mid-Julymid-July• DRS4 installation DRS4 installation end-Julyend-July• Parasitic Run (detect. set-up, beam tests e.g. Deg., eParasitic Run (detect. set-up, beam tests e.g. Deg., e++)) beg.-Aug.beg.-Aug. - mid-Sept.- mid-Sept. • ee++-test +-test + CEX calibration run CEX calibration run mid-Sept. – beg-Oct.mid-Sept. – beg-Oct.

• Remainder of year - Physics data-taking expectation ~ 2~ 2½ months½ months


Schedule ModificationSchedule Modification““Exciting Results” fromExciting Results” from

Lamb-shift Expt. Lamb-shift Expt.

CausedCaused a shift ofa shift of MEG start up by MEG start up by

3 weeks!!!3 weeks!!!

CONSEQUENCE:CONSEQUENCE:

In order to enough timeIn order to enough timeTo calibrate detectorTo calibrate detector

&&obtain usable statisticsobtain usable statistics

Test beam time reducedTest beam time reduced

to absolute minimumto absolute minimum

• No degrader optimizationNo degrader optimization• No positron beam testsNo positron beam tests


OrganizationOrganization

Total of 55 persons for 592 shifts (Full Run Only)Total of 55 persons for 592 shifts (Full Run Only)Total of 55 persons for 592 shifts (Full Run Only)Total of 55 persons for 592 shifts (Full Run Only)

Basic Run LayoutBasic Run LayoutBasic Run LayoutBasic Run Layout

Full Run Part IFull Run Part ICEX Run +CEX Run + Trigger Trigger

Setup + calibrationsSetup + calibrationsDetector monitoringDetector monitoring

Full Run Part IFull Run Part ICEX Run +CEX Run + Trigger Trigger

Setup + calibrationsSetup + calibrationsDetector monitoringDetector monitoring

Parasitic RunParasitic RunBeam optimizationBeam optimization

in parallel within parallel withDebug, Tune &Debug, Tune &

CalibrateCalibrate

Parasitic RunParasitic RunBeam optimizationBeam optimization

in parallel within parallel withDebug, Tune &Debug, Tune &

CalibrateCalibrate

Full Run Part IIFull Run Part IIPre-physics data checkPre-physics data check

Physics DataPhysics Data(MEG + mixed(MEG + mixed

triggers)triggers)

Full Run Part IIFull Run Part IIPre-physics data checkPre-physics data check

Physics DataPhysics Data(MEG + mixed(MEG + mixed

triggers)triggers)

2 Shift2 ShiftCoordinatorsCoordinators 6 weeks tot.6 weeks tot.

2 Shift2 ShiftCoordinatorsCoordinators 6 weeks tot.6 weeks tot.

13 Shift Coordinators13 Shift Coordinators 1 weeks/person1 weeks/person 13 Shift Coordinators13 Shift Coordinators 1 weeks/person1 weeks/person

Run CoordinatorRun Coordinator Run CoordinatorRun Coordinator

Parasitic RunParasitic RunParasitic RunParasitic Run

Full RunFull RunFull RunFull Run

12 Hr Shifts:12 Hr Shifts: 1 DAY SHIFT (Beam Group) 10:00 – 22:001 DAY SHIFT (Beam Group) 10:00 – 22:00 1 NIGHT SHIFT max. 22:00 – 10:00 1 NIGHT SHIFT max. 22:00 – 10:00

1 Shift Leader Nights1 Shift Leader Nights Manned by Detector ExpertsManned by Detector Experts

12 Hr Shifts:12 Hr Shifts: 1 DAY SHIFT (Beam Group) 10:00 – 22:001 DAY SHIFT (Beam Group) 10:00 – 22:00 1 NIGHT SHIFT max. 22:00 – 10:00 1 NIGHT SHIFT max. 22:00 – 10:00

1 Shift Leader Nights1 Shift Leader Nights Manned by Detector ExpertsManned by Detector Experts

8 Hr Shifts:8 Hr Shifts: 1 DAY SHIFT 07:00 – 15:301 DAY SHIFT 07:00 – 15:30 1 EVENING SHIFT 15:00 – 23:301 EVENING SHIFT 15:00 – 23:30 1 NIGHT SHIFT 23:00 – 07:301 NIGHT SHIFT 23:00 – 07:30

1 Shift Leader + 1 Crew Member1 Shift Leader + 1 Crew Member

8 Hr Shifts:8 Hr Shifts: 1 DAY SHIFT 07:00 – 15:301 DAY SHIFT 07:00 – 15:30 1 EVENING SHIFT 15:00 – 23:301 EVENING SHIFT 15:00 – 23:30 1 NIGHT SHIFT 23:00 – 07:301 NIGHT SHIFT 23:00 – 07:30

1 Shift Leader + 1 Crew Member1 Shift Leader + 1 Crew Member

to allow for flexibility + continuity:to allow for flexibility + continuity:

Staggered & Overlapping shift systemStaggered & Overlapping shift system Daily Run Meetings (on-site)Daily Run Meetings (on-site) Weekly Video Run Meeting (Collaboration-wide) Weekly Video Run Meeting (Collaboration-wide) later, weekly Video Physics Analysis Group Meetinglater, weekly Video Physics Analysis Group Meeting Web-based Schedule + Shift list + “On-call” ListWeb-based Schedule + Shift list + “On-call” List

S

imila

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Simila

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ctur

e to

200

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Practical Additions - MonitoringPractical Additions - Monitoring

Access to all

Access to all

MSCB sub-masters

MSCB sub-masters

MIDAS – DAQ control page:MIDAS – DAQ control page:

• web-access to all MSCB sub-masters & nodes• web-access to FE crates status, temp, fans, ON/OFF• web-access to DC HV-control• web-access to Online Analyzer• improved Offline analysis jobs for shift crew All towards the long-term GOAL of Remote Shifts….All towards the long-term GOAL of Remote Shifts….

Access to FE-crates

Access to FE-cratesA

ccess to DC

-HV


Detector SynopsisDetector Synopsis TCsTCs

DCsDCs

Calo.Calo.

BeamBeam

Calo:Calo:• Liquid & Gaseous Liquid & Gaseous purification success purification success optimal LY achievedoptimal LY achieved• further study PM gain further study PM gain stabilitystability

Calo:Calo:• Liquid & Gaseous Liquid & Gaseous purification success purification success optimal LY achievedoptimal LY achieved• further study PM gain further study PM gain stabilitystability

DCs:DCs:• HV instability problemsHV instability problems solved, fully efficientsolved, fully efficient• Resolutions?Resolutions?

DCs:DCs:• HV instability problemsHV instability problems solved, fully efficientsolved, fully efficient• Resolutions?Resolutions?

TCs:TCs:• APD electronics induces too APD electronics induces too higher noise level in DCs higher noise level in DCs Switched OFFSwitched OFF• APD DAQ control problemsAPD DAQ control problems• still Laser temp. control problemsstill Laser temp. control problems

TCs:TCs:• APD electronics induces too APD electronics induces too higher noise level in DCs higher noise level in DCs Switched OFFSwitched OFF• APD DAQ control problemsAPD DAQ control problems• still Laser temp. control problemsstill Laser temp. control problems Beam:Beam:

• BTS He cold leak around JT- BTS He cold leak around JT- valve solved temporarily forvalve solved temporarily for runrun• Degrader change from Degrader change from 200200m to 300m to 300m during Runm during Run stopping distribution problemstopping distribution problem

Beam:Beam:• BTS He cold leak around JT- BTS He cold leak around JT- valve solved temporarily forvalve solved temporarily for runrun• Degrader change from Degrader change from 200200m to 300m to 300m during Runm during Run stopping distribution problemstopping distribution problem


Trigger + DAQ SynopsisTrigger + DAQ Synopsis Trigger+ Splitters Trigger+ Splitters

Online ClusterMegonxx

Online ClusterMegonxx Trigger:Trigger:

Full Complement of 29 Triggers with pre-scaling usedFull Complement of 29 Triggers with pre-scaling used EE-resolution improved 20% (7.5%FWHM @ 55MeV) -resolution improved 20% (7.5%FWHM @ 55MeV)

> thresh.> thresh. Z-resolution ZZ-resolution Zrecrec- Z- ZTCTC(Q(Qratioratio) improved ~23% (5.5cm) ) improved ~23% (5.5cm)

Direction matching Direction matching ee with fibreswith fibres still missingstill missing !!! !!! APD(OFF) APD(OFF) XEC(PMT-index) + TC-bar(index,z) XEC(PMT-index) + TC-bar(index,z) where z from bar charge-ratio where z from bar charge-ratio

Implementation of Implementation of -trigger during beam=“ON” <T-trigger during beam=“ON” <TCALIBCALIB

Trigger#0 TC eff. loss ~25% due broken LVDS transmitter Trigger#0 TC eff. loss ~25% due broken LVDS transmitter

for first-part of the runfor first-part of the run

Trigger:Trigger: Full Complement of 29 Triggers with pre-scaling usedFull Complement of 29 Triggers with pre-scaling used EE-resolution improved 20% (7.5%FWHM @ 55MeV) -resolution improved 20% (7.5%FWHM @ 55MeV)

> thresh.> thresh. Z-resolution ZZ-resolution Zrecrec- Z- ZTCTC(Q(Qratioratio) improved ~23% (5.5cm) ) improved ~23% (5.5cm)

Direction matching Direction matching ee with fibreswith fibres still missingstill missing !!! !!! APD(OFF) APD(OFF) XEC(PMT-index) + TC-bar(index,z) XEC(PMT-index) + TC-bar(index,z) where z from bar charge-ratio where z from bar charge-ratio

Implementation of Implementation of -trigger during beam=“ON” <T-trigger during beam=“ON” <TCALIBCALIB

Trigger#0 TC eff. loss ~25% due broken LVDS transmitter Trigger#0 TC eff. loss ~25% due broken LVDS transmitter

for first-part of the runfor first-part of the runlcmeg05lcmeg05lcmeg05lcmeg05

lcmeg04lcmeg04lcmeg04lcmeg04




OfflineClusterlcmeg

OfflineClusterlcmeg

DAQ:DAQ:• LT~84%, DAQ inter-run time reduced by > 4x LT~84%, DAQ inter-run time reduced by > 4x • DAQ online monitoring & control - many additionsDAQ online monitoring & control - many additions• Online (backend) 2 TB storageOnline (backend) 2 TB storage• Offline (lcmeg) 64 CPUs + now 150 TB disk Offline (lcmeg) 64 CPUs + now 150 TB disk • “ “Lazylogger” autocopy Online Lazylogger” autocopy Online Offline Offline factor 2 compression offlinefactor 2 compression offline

DRS4 + part DRS3DRS4 + part DRS3

FE-electronics: mostly NEW!FE-electronics: mostly NEW!

DRS4 teething problems: synchronization + jitterDRS4 teething problems: synchronization + jitter

FE-electronics: mostly NEW!FE-electronics: mostly NEW!

DRS4 teething problems: synchronization + jitterDRS4 teething problems: synchronization + jitter


2009 Run Conditions 2009 Run Conditions

- target - target inclinationinclinationangleangle

1.1. Target Angle:Target Angle: - similar slant angle - similar slant angle as 2008 as 20081.1. Target Angle:Target Angle: - similar slant angle - similar slant angle as 2008 as 2008

Target Inclination 2009 Target Inclination 2009 = (20.0 = (20.0 ± 0.3)° ± 0.3)° provisional provisional Target Inclination 2009 Target Inclination 2009 = (20.0 = (20.0 ± 0.3)° ± 0.3)° provisional provisional

• Conventional = (20.6 Conventional = (20.6 ± 0.2)°± 0.2)°• PhotogrammetricPhotogrammetric (outside COBRA) = (outside COBRA) = (20.4 (20.4 ± 0.2)°± 0.2)°• PhotogrammetricPhotogrammetric (inside COBRA) = (inside COBRA) = (20.3 (20.3 ± 0.3)°± 0.3)°

• Conventional = (20.6 Conventional = (20.6 ± 0.2)°± 0.2)°• PhotogrammetricPhotogrammetric (outside COBRA) = (outside COBRA) = (20.4 (20.4 ± 0.2)°± 0.2)°• PhotogrammetricPhotogrammetric (inside COBRA) = (inside COBRA) = (20.3 (20.3 ± 0.3)°± 0.3)°

3.3. Beam Intensity:Beam Intensity: - on average 10% > I - on average 10% > IPROTPROT compared 2008 compared 2008 2 main modes tuned 2 main modes tuned

“ “Normal” – same slits as 2008 & “Normal*8” – slits diff., same absolute rate as 2008Normal” – same slits as 2008 & “Normal*8” – slits diff., same absolute rate as 20083.3. Beam Intensity:Beam Intensity: - on average 10% > I - on average 10% > IPROTPROT compared 2008 compared 2008 2 main modes tuned 2 main modes tuned

“ “Normal” – same slits as 2008 & “Normal*8” – slits diff., same absolute rate as 2008Normal” – same slits as 2008 & “Normal*8” – slits diff., same absolute rate as 2008

ModeMode RR Measured Rate COBRA at 2mAMeasured Rate COBRA at 2mA

200200m Degraderm Degrader

RR Rate COBRA at 2mA Rate COBRA at 2mA


““Normal” (slits 115)Normal” (slits 115) 4.34.3101077 ++ss-1-1 (2009) (2009) 3.73.7101077 ++ss-1 -1 (2008)(2008)

““Normal*8” (slits 105)Normal*8” (slits 105)

( physics data)( physics data)

3.73.7101077 ++ss-1 -1 (2009)(2009) 3.23.2101077 ++ss-1 -1 interp. (2009)interp. (2009)

2008 <2008 <> = (20.5 > = (20.5 0.3) 0.3)ºº

2.2. Degrader:Degrader: two settings used during Run two settings used during Run 200200m & 300m & 300m Mylar & 94%He/6%Airm Mylar & 94%He/6%Air2.2. Degrader:Degrader: two settings used during Run two settings used during Run 200200m & 300m & 300m Mylar & 94%He/6%Airm Mylar & 94%He/6%Air

Stopping rate for physics Run (300m degrader) at 2.2 mA ~ 2.9·107+s-1


Degrader Question 200Degrader Question 200mm

GEM 2008GEM 2008 4.3% Air4.3% Air

GEM Monte-Carlo 2008 Shows stopping US of target centre by > 50GEM Monte-Carlo 2008 Shows stopping US of target centre by > 50m CHm CH22

for a target thickness of 205 for a target thickness of 205 m 4.3% Airm 4.3% Air

Equivalent to 140 Equivalent to 140 m CHm CH22

Along l or ~ 100Along l or ~ 100 Mylar Mylar l=585 l=585 mm

t=205 t=205 mm

Remember 100Remember 100m of degraderm of degrader Equivalent to ~ Equivalent to ~ 24% of target thickness ONLY!!!24% of target thickness ONLY!!!Therefore should just shift peak of Therefore should just shift peak of stopping distribution inside of targetstopping distribution inside of target


Conclusion: Conclusion: Remove 100Remove 100m of Mylar i.e. go to 200m of Mylar i.e. go to 200m thickness to centre stopping distributionm thickness to centre stopping distribution

2009 Physics Run started with 200m Degrader since optimization skipped due to time

VerticalProfile0.5 mm Aare

VerticalProfile0.5 mm Aare

HorizontalProfile0.8 mm high

HorizontalProfile0.8 mm high

Vertex DistributionVertex Distribution Using MichelsUsing MichelsVertex DistributionVertex Distribution Using MichelsUsing Michels

MeasuredMeasured MeasuredMeasured 200200mm


GEM vs DataGEM vs Data

GEM 2009 – GEM 2009 – confirms central shift confirms central shift BUT!!!BUT!!!Data features not allData features not allreproduced e.g. reproduced e.g.

• AsymmetriesAsymmetries• stopping with no targetstopping with no target

200 200 m Degraderm DegraderExample MEG-trigger Data 2009Example MEG-trigger Data 2009 Run# 53000Run# 53000


TIC-asymmetry DS/US ~ 4.3TIC-asymmetry DS/US ~ 4.3TIC-asymmetry DS/US ~ 4.3TIC-asymmetry DS/US ~ 4.3

Timing problem TC-USTiming problem TC-USEnhances AsymmetryEnhances AsymmetryFor MEG-dataFor MEG-data



TIC-asymmetry DS/US ~ 1.3TIC-asymmetry DS/US ~ 1.3TIC-asymmetry DS/US ~ 1.3TIC-asymmetry DS/US ~ 1.3

GEM/Data:GEM/Data: MCMC Trg# 22 dataTrg# 22 data Trg# 0 dataTrg# 0 data

300 micron Deg.300 micron Deg. 1.661.66 1.371.37 1.41.4

200 micron Deg.200 micron Deg. 1.71.7 3.03.0 4.64.6******

*** US-TC*** US-TCenhancementenhancement

200200200200

GEM 2009GEM 2009

6% Air6% Air

300300300300

100100100100

strong asymmetry in TC US/DS hit-maps seen???strong asymmetry in TC US/DS hit-maps seen???


Degrader ConclusionsDegrader Conclusions Motivation:Motivation:Originally 2008 degrader of 300 microns changed to 200 microns in 2009 to optimizeOriginally 2008 degrader of 300 microns changed to 200 microns in 2009 to optimizestop-distribution to centre of the target for now fixed 6% Air-admixture stop-distribution to centre of the target for now fixed 6% Air-admixture amongst other information, this was supported by GEM Monte-Carloamongst other information, this was supported by GEM Monte-Carlo

200200 Physics Data: 29/10 – 23/11 DAQ-time: 14.0D Physics Data: 29/10 – 23/11 DAQ-time: 14.0D300300 Physics Data. 26/11 – 23/12 DAQ-time: 21.2D Physics Data. 26/11 – 23/12 DAQ-time: 21.2D200200 Physics Data: 29/10 – 23/11 DAQ-time: 14.0D Physics Data: 29/10 – 23/11 DAQ-time: 14.0D300300 Physics Data. 26/11 – 23/12 DAQ-time: 21.2D Physics Data. 26/11 – 23/12 DAQ-time: 21.2D

However – strong asymmetry in TC US/DS hit-maps seen??? Changed back to 2008 situation during RunHowever – strong asymmetry in TC US/DS hit-maps seen??? Changed back to 2008 situation during Run

RunCondition

Relative Muon Stopping Statistics 2009/2008:Relative Muon Stopping Statistics 2009/2008:

(i)(i) DAQ-time 2009/2008 = DAQ-time 2009/2008 = 0.732 Dominant factor!0.732 Dominant factor!(ii)(ii) Relative time-weighted stopping-rates 2009/2008 = Relative time-weighted stopping-rates 2009/2008 = 0.866 0.866 (all 300(all 300 data = 0.94) data = 0.94)

(2009: (2009: stopstop200200~56%, ~56%, stopstop

300300~82%) – ~82%) – relative values from Michel datarelative values from Michel data

Relative Stopping Statistics: SSRelative Stopping Statistics: SS20092009/SS/SS20082008 = = 0.634 0.634 Dominated by run time!Dominated by run time!

However true relative statistics 2009 much better since spectrometer tracking efficiencyHowever true relative statistics 2009 much better since spectrometer tracking efficiency& trigger efficiency much better than 2008!& trigger efficiency much better than 2008! factor ~3.5 x 0.634 = ~ Factor 2.2 factor ~3.5 x 0.634 = ~ Factor 2.2

Relative Muon Stopping Statistics 2009/2008:Relative Muon Stopping Statistics 2009/2008:

(i)(i) DAQ-time 2009/2008 = DAQ-time 2009/2008 = 0.732 Dominant factor!0.732 Dominant factor!(ii)(ii) Relative time-weighted stopping-rates 2009/2008 = Relative time-weighted stopping-rates 2009/2008 = 0.866 0.866 (all 300(all 300 data = 0.94) data = 0.94)

(2009: (2009: stopstop200200~56%, ~56%, stopstop

300300~82%) – ~82%) – relative values from Michel datarelative values from Michel data

Relative Stopping Statistics: SSRelative Stopping Statistics: SS20092009/SS/SS20082008 = = 0.634 0.634 Dominated by run time!Dominated by run time!

However true relative statistics 2009 much better since spectrometer tracking efficiencyHowever true relative statistics 2009 much better since spectrometer tracking efficiency& trigger efficiency much better than 2008!& trigger efficiency much better than 2008! factor ~3.5 x 0.634 = ~ Factor 2.2 factor ~3.5 x 0.634 = ~ Factor 2.2

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Conclusion:Conclusion: MC does not support “strong leakage” from DS-face for 200 MC does not support “strong leakage” from DS-face for 200m case m case detailed check & MC-study underwaydetailed check & MC-study underway

Necessary to perform optimization beam test using different degrader thicknessesNecessary to perform optimization beam test using different degrader thicknesses Will be performed spring 2010Will be performed spring 2010

• measuring stopping-rate by counting Michel emeasuring stopping-rate by counting Michel e++ using reconstructed tracks using reconstructed tracks originating from the target volume vs. several degrader thicknessesoriginating from the target volume vs. several degrader thicknesses

• measure “No-target” stop distribution for above degrader thicknesses to comparemeasure “No-target” stop distribution for above degrader thicknesses to compare with & tune/optimize MCwith & tune/optimize MC

Degrader Conclusions cont.Degrader Conclusions cont.


Further Aspects of 2009 RunFurther Aspects of 2009 Run• BTS: He transfer-line coupling + Joule-Thompson Fore-valve region, cold-leakBTS: He transfer-line coupling + Joule-Thompson Fore-valve region, cold-leak (meant BTS had to be warmed-up & JT-tower opened + additional pump-stand introduced(meant BTS had to be warmed-up & JT-tower opened + additional pump-stand introduced that could work in B-field environment)that could work in B-field environment)

Fore-valveFore-valve

isolation vacuumisolation vacuum

OPENOPEN

CLOSEDCLOSED

He leak DetectionHe leak DetectionOpen: 3Open: 3·10·10-7-7mblsmbls-1-1

Closed: >Closed: >77·10·10-6-6mblsmbls-1-1

FV-OPENFV-OPEN

FV < 7.5%FV < 7.5%

JT-TowerJT-Tower

BTSBTS

Problem solved for Run:• New In-coupling transfer line

• New additional pump-stand for isolation vacuum

Transfer-lineTransfer-linecouplingcoupling


FE-ElectronicsFE-Electronics• FE-Electronics:FE-Electronics: (teething problems with DRS4 implementation took much longer than anticipated(teething problems with DRS4 implementation took much longer than anticipated involving both software & hardware modifications involving both software & hardware modifications also the new architecture 4-chips/2-chips -also the new architecture 4-chips/2-chips - necessitated the total re-doing of the zero-suppression algorithm; physical displacement ofnecessitated the total re-doing of the zero-suppression algorithm; physical displacement of cross-associated anode & cathode channels to different modules)cross-associated anode & cathode channels to different modules)

(i)(i) DRS4 clock synchronizationDRS4 clock synchronization(ii)(ii) DRS4 large dispersion in inter –channel, -chip, -board, -crate time-jitterDRS4 large dispersion in inter –channel, -chip, -board, -crate time-jitter(iii)(iii) DRS4 spike & ripple suppression DRS4 spike & ripple suppression (iv)(iv) DC zero-suppression algorithm DC zero-suppression algorithm

• Noise problems:Noise problems: (Fourier power spectrum analysis –showed various source frequencies- high frequency (Fourier power spectrum analysis –showed various source frequencies- high frequency range associated with APD electronics resulting in TC fibre system not being used)range associated with APD electronics resulting in TC fibre system not being used)

(i)(i) Environmental noise – seen by DC & TC systemsEnvironmental noise – seen by DC & TC systems(ii)(ii) New APD Fe-electronics producer/propagator of high noise-levels on DCNew APD Fe-electronics producer/propagator of high noise-levels on DC readoutreadout

Details S

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Details S

tefan talk

Details Flavio

talk

Details Flavio

talk


LXe AspectsLXe Aspects Calorimeter:Calorimeter: 2008 Light-yield < expected both for s & s (Q/A)/(Q/A)~ 1.25 expect LP ~ 1.92!!! Contamination? new purifier installed Liquid & Gaseous & No purification scenarios studied

Calorimeter:Calorimeter: 2008 Light-yield < expected both for s & s (Q/A)/(Q/A)~ 1.25 expect LP ~ 1.92!!! Contamination? new purifier installed Liquid & Gaseous & No purification scenarios studied

• Light-yield proved to be stable @ 1% level during 2009 Run

• Achieved absolute LY gammas & alphas as expected

• long-term PMT gain-drift still not understood ~ 6% drop over run monitored extensively by many tools – can be compensated for with HV-adjustment if necessary – problem still being studied• gain-variation with beam-loading well understood –new ideas

(Q/A)(Q/A)/(Q/A)/(Q/A) ~ 1.92 !!!~ 1.92 !!!

R9869 Gain Shift vs SKB

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R9869 Gain Shift vs SKB

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GainGain ChronologyChronology 2009 Run2009 Run

SKB = cathode blue sensitivityvs. serial no – shows possible link of gain to too much alkali?

SKBSKB

Rel gain-shiftRel gain-shift

Serial NoSerial No


Beam Time/DataBeam Time/DataIn view of the extremely tight schedule for starting from “scratch” with the set up in In view of the extremely tight schedule for starting from “scratch” with the set up in E5,E5,also with Lamb-shift extension + numerous detector/electronics etc. problems to be also with Lamb-shift extension + numerous detector/electronics etc. problems to be solved … solved … Managed (in real days) 55% of 2008 physics data-takingManaged (in real days) 55% of 2008 physics data-taking & approximately same number of triggers& approximately same number of triggers

In view of the extremely tight schedule for starting from “scratch” with the set up in In view of the extremely tight schedule for starting from “scratch” with the set up in E5,E5,also with Lamb-shift extension + numerous detector/electronics etc. problems to be also with Lamb-shift extension + numerous detector/electronics etc. problems to be solved … solved … Managed (in real days) 55% of 2008 physics data-takingManaged (in real days) 55% of 2008 physics data-taking & approximately same number of triggers& approximately same number of triggers

Parasitic RunParasitic Run:: 11stst September- 15 September- 15thth September ~ September ~ 2 weeks2 weeks Beam Tests/Tuning (Beam Tests/Tuning (~1 week~1 week))Full Run Part 1Full Run Part 1:: 1616thth Sept. – 30 Sept. – 30thth October ~ October ~6 weeks6 weeks CEX 12CEX 12th th October– 24October– 24thth October ( October (12 days12 days))Full Run Part 2Full Run Part 2:: 2525thth October – 22 October – 22ndnd December ~ December ~88½½ weeks weeks Physics Data 200Physics Data 200m Degrader ~17.5 Daysm Degrader ~17.5 Days Physics Data 300Physics Data 300m Degrader ~25.5 Daysm Degrader ~25.5 Days

Parasitic RunParasitic Run:: 11stst September- 15 September- 15thth September ~ September ~ 2 weeks2 weeks Beam Tests/Tuning (Beam Tests/Tuning (~1 week~1 week))Full Run Part 1Full Run Part 1:: 1616thth Sept. – 30 Sept. – 30thth October ~ October ~6 weeks6 weeks CEX 12CEX 12th th October– 24October– 24thth October ( October (12 days12 days))Full Run Part 2Full Run Part 2:: 2525thth October – 22 October – 22ndnd December ~ December ~88½½ weeks weeks Physics Data 200Physics Data 200m Degrader ~17.5 Daysm Degrader ~17.5 Days Physics Data 300Physics Data 300m Degrader ~25.5 Daysm Degrader ~25.5 Days

Normal Physics Data-taking:Normal Physics Data-taking:• MEG 12-mixed trigger MEG 12-mixed trigger 6 Hz Trigger Rate, LT~84%6 Hz Trigger Rate, LT~84% 300 300m Degraderm Degrader 10 Hz, 75% LT 10 Hz, 75% LT 200200m Degraderm Degrader• Daily LED-calibration beam “on-off”Daily LED-calibration beam “on-off”• 3/week Full-calibration LED beam “on” +LED beam “off”3/week Full-calibration LED beam “on” +LED beam “off” + C-W (Li) + C-W (B) + + C-W (Li) + C-W (B) + ss

Normal Physics Data-taking:Normal Physics Data-taking:• MEG 12-mixed trigger MEG 12-mixed trigger 6 Hz Trigger Rate, LT~84%6 Hz Trigger Rate, LT~84% 300 300m Degraderm Degrader 10 Hz, 75% LT 10 Hz, 75% LT 200200m Degraderm Degrader• Daily LED-calibration beam “on-off”Daily LED-calibration beam “on-off”• 3/week Full-calibration LED beam “on” +LED beam “off”3/week Full-calibration LED beam “on” +LED beam “off” + C-W (Li) + C-W (B) + + C-W (Li) + C-W (B) + ss

MEGMEG DATADATA200200m (Runs# 51824-57184)m (Runs# 51824-57184) 5313 Runs a 2k events5313 Runs a 2k events 10.64 M Triggers10.64 M Triggers Time 14:00.31.17Time 14:00.31.17

300300m (Runs# 57582-64482)m (Runs# 57582-64482) 5775 Runs a 2k events5775 Runs a 2k events 11.63 M Triggers11.63 M Triggers Time 21.05.25.07Time 21.05.25.07

MEGMEG DATADATA200200m (Runs# 51824-57184)m (Runs# 51824-57184) 5313 Runs a 2k events5313 Runs a 2k events 10.64 M Triggers10.64 M Triggers Time 14:00.31.17Time 14:00.31.17

300300m (Runs# 57582-64482)m (Runs# 57582-64482) 5775 Runs a 2k events5775 Runs a 2k events 11.63 M Triggers11.63 M Triggers Time 21.05.25.07Time 21.05.25.07

Total of 93 TB DataTotal of 93 TB DataTaken 2009Taken 2009

Total of 93 TB DataTotal of 93 TB DataTaken 2009Taken 2009

Run 2009Run 2009Run 2009Run 2009

93 TB data93 TB data93 TB data93 TB data


Conclusions 2009Conclusions 2009

• Of the original expected ~11Of the original expected ~11½ weeks of physics data-taking (MEG Schedule) minus½ weeks of physics data-taking (MEG Schedule) minus the 3 weeks extension granted to Lamb-shift expt. We managed to take ~ 8 weeks of the 3 weeks extension granted to Lamb-shift expt. We managed to take ~ 8 weeks of MEG data!MEG data!

• The major problem encounter during the 2008 Run (DC HV-instability) was solved and the The major problem encounter during the 2008 Run (DC HV-instability) was solved and the chambers ran with “full efficiency”chambers ran with “full efficiency”

• The LY of the calorimeter also “plateaued” at its expected value allowing The LY of the calorimeter also “plateaued” at its expected value allowing //-discrimination-discrimination with beam “on” enabling continuous monitoring during MEG data-taking – LY stable over with beam “on” enabling continuous monitoring during MEG data-taking – LY stable over extended period of time to ~ 1% level extended period of time to ~ 1% level WITHOUT further purification!!!WITHOUT further purification!!!

• The LXe PMT long-term gain-drift is not understood yet though enough tools available to The LXe PMT long-term gain-drift is not understood yet though enough tools available to monitor & sufficient HV-reserve so not problematic. Beam correlated gain variations well monitor & sufficient HV-reserve so not problematic. Beam correlated gain variations well studied – strategy for UCN beam structure being further studied.studied – strategy for UCN beam structure being further studied.

• Reduction of the timing-jitter from DRS4 channels on different boards is being studiedReduction of the timing-jitter from DRS4 channels on different boards is being studied together with the possibility of running at higher frequencytogether with the possibility of running at higher frequency

• TC fibre-detectors which could not be used in 2009 due to large induced noise on the DCTC fibre-detectors which could not be used in 2009 due to large induced noise on the DC electronics are being modified & expected to be fully functional for 2010electronics are being modified & expected to be fully functional for 2010

• Of the original expected ~11Of the original expected ~11½ weeks of physics data-taking (MEG Schedule) minus½ weeks of physics data-taking (MEG Schedule) minus the 3 weeks extension granted to Lamb-shift expt. We managed to take ~ 8 weeks of the 3 weeks extension granted to Lamb-shift expt. We managed to take ~ 8 weeks of MEG data!MEG data!

• The major problem encounter during the 2008 Run (DC HV-instability) was solved and the The major problem encounter during the 2008 Run (DC HV-instability) was solved and the chambers ran with “full efficiency”chambers ran with “full efficiency”

• The LY of the calorimeter also “plateaued” at its expected value allowing The LY of the calorimeter also “plateaued” at its expected value allowing //-discrimination-discrimination with beam “on” enabling continuous monitoring during MEG data-taking – LY stable over with beam “on” enabling continuous monitoring during MEG data-taking – LY stable over extended period of time to ~ 1% level extended period of time to ~ 1% level WITHOUT further purification!!!WITHOUT further purification!!!

• The LXe PMT long-term gain-drift is not understood yet though enough tools available to The LXe PMT long-term gain-drift is not understood yet though enough tools available to monitor & sufficient HV-reserve so not problematic. Beam correlated gain variations well monitor & sufficient HV-reserve so not problematic. Beam correlated gain variations well studied – strategy for UCN beam structure being further studied.studied – strategy for UCN beam structure being further studied.

• Reduction of the timing-jitter from DRS4 channels on different boards is being studiedReduction of the timing-jitter from DRS4 channels on different boards is being studied together with the possibility of running at higher frequencytogether with the possibility of running at higher frequency

• TC fibre-detectors which could not be used in 2009 due to large induced noise on the DCTC fibre-detectors which could not be used in 2009 due to large induced noise on the DC electronics are being modified & expected to be fully functional for 2010electronics are being modified & expected to be fully functional for 2010


Conclusions 2009 cont.Conclusions 2009 cont.

• Fine-tuning of the degrader with beam and a check of the range-straggling in COBRA Fine-tuning of the degrader with beam and a check of the range-straggling in COBRA without a target, for MC comparison/tuning, will be undertakenwithout a target, for MC comparison/tuning, will be undertaken

• The postponed test of a monochromatic positron beam which would allow the energy The postponed test of a monochromatic positron beam which would allow the energy dependent study of our positron spectrometer resolutions as well as the relative dependent study of our positron spectrometer resolutions as well as the relative acceptances, will be scheduledacceptances, will be scheduled

• Many of the outstanding questions concerning detector performance: DC cathode foil Many of the outstanding questions concerning detector performance: DC cathode foil aging,TC fibre detector noise suppression, DC-survey position, magnetic field symmetry, aging,TC fibre detector noise suppression, DC-survey position, magnetic field symmetry, chamber resolutions etc. are now being addressed or to be answered soon!chamber resolutions etc. are now being addressed or to be answered soon! – – MORE TIME NEEDED!MORE TIME NEEDED!

This overview was meant as an introduction to the following “Expert” talksThis overview was meant as an introduction to the following “Expert” talks

• Fine-tuning of the degrader with beam and a check of the range-straggling in COBRA Fine-tuning of the degrader with beam and a check of the range-straggling in COBRA without a target, for MC comparison/tuning, will be undertakenwithout a target, for MC comparison/tuning, will be undertaken

• The postponed test of a monochromatic positron beam which would allow the energy The postponed test of a monochromatic positron beam which would allow the energy dependent study of our positron spectrometer resolutions as well as the relative dependent study of our positron spectrometer resolutions as well as the relative acceptances, will be scheduledacceptances, will be scheduled

• Many of the outstanding questions concerning detector performance: DC cathode foil Many of the outstanding questions concerning detector performance: DC cathode foil aging,TC fibre detector noise suppression, DC-survey position, magnetic field symmetry, aging,TC fibre detector noise suppression, DC-survey position, magnetic field symmetry, chamber resolutions etc. are now being addressed or to be answered soon!chamber resolutions etc. are now being addressed or to be answered soon! – – MORE TIME NEEDED!MORE TIME NEEDED!

This overview was meant as an introduction to the following “Expert” talksThis overview was meant as an introduction to the following “Expert” talks


FinallyFinallyA substantial portion of the year was A substantial portion of the year was ALSO utilized to analyze our ALSO utilized to analyze our 2008 Physics Data 2008 Physics Data In parallel to solving the previous In parallel to solving the previous outstanding problems.outstanding problems.

The Preprint:The Preprint:

Is now ready for submissionIs now ready for submission for publication!for publication!

MEG 2009 Run

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Transcript of MEG 2009 Run