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Transcript of 1 Beamline DayTalkPresenterTopic Wed 9 th 1L. HowlettTarget Design Status 2K. WalaronBeamline/Target...
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1
Beamline
Day Talk Presenter Topic
Wed 9th 1 L. Howlett Target Design Status
2 K. Walaron Beamline/Target Diagnostics
3 K. Tilley Status of Muon Beamline design
4 P. Drumm Beamline Engineering
MICE Collaboration Meeting, LBNL, Feb2005
Summaries & Action Items
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Concern over Radiation levels
FIRST assessment of radiation levels.
Using FLUKA code.
800MeV protons, 10x10x1mm3 Ti target.
Flux at 1.4E12
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paul drumm, mutac jan 2003 12
MICE Target work (CB et al)
1. Calculate and review target heating under 1.7x10^12 proton intersections. 1Hz/3Hz.
2. Investigate temperature monitoring schemes for target (thermocouple/IR/IR+modified target topology)
3. Solve position sensing system irregularities
4. Update TRD with current FLUKA radiation level results
5. Continue to assess radiation level & effects on NdFeB / electronics
6. Setup ISIS engineer contact & determine acceptable in-vacuum materials etc.
7. Construct and test full prototype.
Summary• Pre-prototype has been constructed and tested. Experience gained in control electronics, mechanical
mounting & position readout very useful.• First full prototype expected at end of February.• Programme progressing according to Schedule. Problems however with radiation levels, heating &
vacuum conditions remain of concern. Involvement of ISIS engineers essential for tackling some of these.• Some modifications/design iterations expected after prototype constructed.
Actions
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Beamline/Target Diagnostics
Kenny Walaron
University of Glasgow / RAL
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Motivation
• Particle production from target = greatest unknown in experiment (& governs all rates, Good Muons etc)
• Measure proton interceptions / pion&muon production against & up to maximum permissible ISIS beamloss
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Equipment & Position
• Segmented scintillator with double sided read-out to measure dE/dx placed inside ISIS ring
PMTs XP2020 or EM19954
Segmented BC-404
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Simulation: 10m from Target (20m also simulated)
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paul drumm, mutac jan 2003 17
Target Diagnostics (KW et al)
1. Establish if present PMTs are reliable, if not obtain & forward quote for new.
2. Submit experiment proposal to ISIS (PD)
3. Purchase equipment (scintillators…) and construct detectors
4. Source a suitable DAQ system. (basis of a Question to Plenary audience)
5. Mount in position in synchrotron vault - Summer'05 shutdown.
Actions (KW et al)
• Plan drawn up to quantify particle production from target, using dE/dx in scintillator devices.
• Using extension of g4beamline code - proton, (pion/muon) discrimination possible in theory. Actual PID discrimination subject to rates observed, ideas being pursued to handle these.
Summary
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paul drumm, mutac jan 2003 18
Target Diagnostics (KW et al)
1. Establish if present PMTs are reliable, if not obtain & forward quote for new.
2. Submit experiment proposal to ISIS (PD)
3. Purchase equipment (scintillators…) and construct detectors
4. Source a suitable DAQ system.* (basis of a Question to Plenary audience)
5. Mount in position in synchrotron vault - Summer'05 shutdown.
Actions (KW et al)
• Plan drawn up to quantify particle production from target, using dE/dx in scintillator devices.
• Using extension of g4beamline code - proton, (pion/muon) discrimination possible in theory. Actual PID discrimination subject to rates observed, ideas being pursued to handle these.
Summary
"Audience Action"! :-*.(Does any person know of an available DAQ system suitable for this experiment?)
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paul drumm, mutac jan 2003 19
Status of Muon Beamline design work
Kevin Tilley, RAL, 9th Feb
• Including Beamline Materials in new revision
• Reference ('true') momenta/materials effects (g4)
• Fitting TTL representations to 'true' g4 effects.
• Some inclusions in TPT/TTL design codes ….
• The Pb-diffuser position: feasible? / re-examination?
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paul drumm, mutac jan 2003 20
Statement of Problem:SEPT04 & Beamline Materials
SEPT04 Beamline optics & initial momenta designed w/o taking into account effect of materials ie. Vacuum windows, PIDs etc, on beam.
μ+ central momentum in Tracker1 – design 206 MeV/c
μ+ central momentum in Tracker1 – achieved (g4bl) 183 MeV/c
hence:-
+ exist probable further differences ie. MATCHING ('Good Muons'), EMITTANCE etc between design goal & g4bl evaln.
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paul drumm, mutac jan 2003 21
Deduction of correct 'Reference' Initial Momenta's/Material Effects
(Thks to KW, using g4bl/g4)
Aimed @ 207.31 after 2x Tkr Planes, for p-ref=200MeV/c
Q1'
Q2'
Q3'
B1
DecS
Q4
Q5
Q6
Q7
Q8
Q9
ECSS
Arrive @ Muon source momentum.
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paul drumm, mutac jan 2003 22
Element Momentum Before (MeV/c) Momentum After (MeV/c) momDiff g4 √θ2 (mrad)
TrackerPlanesX2 208.05 207.31 0.74 5.97TrackerWindow 208.566 208.05 0.516 8.12AIRDiffuser_trackerWindow 208.582 208.566 0.016 0.71Diffuser 219.862 208.582 11.28 86.68AIRTOF1_diffuser 220.012 219.862 0.15 2.59TOF1 232.162 220.012 12.15 24.76AirCkov1_TOF1 233.832 232.162 1.67 11.47Ckov1 241.812 233.832 7.98 23.60AirTOF0_Ckov1 242.252 241.812 0.44 3.95TOF0 253.892 242.252 11.64 22.11AIRprotAbs_TOF0 255.422 253.892 1.53 6.72ProtAbs 265.832 255.422 10.41 18.98AIRdecSolWin_ProtAbs 265.952 265.832 0.12 1.82DecSolWinDS 266.2 265.952 0.248 3.82
Hence…Ref set of Beamline Muon Momentas & 2
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paul drumm, mutac jan 2003 23
Element Momentum Before (MeV/c) Momentum After (MeV/c) momDiff g4 √θ2 (mrad)
TrackerPlanesX2 208.05 207.31 0.74 5.97TrackerWindow 208.566 208.05 0.516 8.12AIRDiffuser_trackerWindow 208.582 208.566 0.016 0.71Diffuser 219.862 208.582 11.28 86.68AIRTOF1_diffuser 220.012 219.862 0.15 2.59TOF1 232.162 220.012 12.15 24.76AirCkov1_TOF1 233.832 232.162 1.67 11.47Ckov1 241.812 233.832 7.98 23.60AirTOF0_Ckov1 242.252 241.812 0.44 3.95TOF0 253.892 242.252 11.64 22.11AIRprotAbs_TOF0 255.422 253.892 1.53 6.72ProtAbs 265.832 255.422 10.41 18.98AIRdecSolWin_ProtAbs 265.952 265.832 0.12 1.82DecSolWinDS 266.2 265.952 0.248 3.82
Hence…Ref set of Beamline Muon Momentas & 2
…. pion channel in progress …
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paul drumm, mutac jan 2003 24
TTL Model Fitting:- Example - 2" TOF0
Fitted TTL model. Choose to prioritise fit to delta-p, vary density --> & find density 0.892
ie. Now p-totout = 242.252MeV/c. ~ 16.9 mrad (cf. g4bl 22.1mrad)2
INPUT:
OUTPUT:
p-tot X'
√θ2TTL ~ 0.76.√θ2
g4bl
Basic TTL model does not give same p-totout, or ,so,2
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paul drumm, mutac jan 2003 25
Hence…table of ready TTL/TPT materials-fit data
Element Momentum Before (MeV/c) Momentum After (MeV/c) momDiff TTL/TPT √θ2 (mrad) g4 √θ2 (mrad)
TrackerPlanesX2TrackerWindowAIRDiffuser_trackerWindowDiffuserAIRTOF1_diffuser 220.012 219.862 0.15 2.06 2.59TOF1 232.162 220.012 12.15 20.66 24.76AirCkov1_TOF1 233.832 232.162 1.67 7.596 11.47Ckov1 241.812 233.832 7.98 19.836 23.60AirTOF0_Ckov1 242.252 241.812 0.44 3.5 3.95TOF0 253.892 242.252 11.64 16.91 22.11AIRprotAbs_TOF0 255.422 253.892 1.53 6.357 6.72ProtAbs 265.832 255.422 10.41 14.68 18.98AIRdecSolWin_ProtAbs 265.952 265.832 0.12 1.22 1.82DecSolWinDS 266.2 265.952 0.248 3.42 3.82
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paul drumm, mutac jan 2003 26
Illustration of some of the Muon channel materials in TPT:-
Q4
Q5
Q6
Q7
Q8
Q9
TOF0
AT0C
CKV1
TOF1
Q4
Q5
Q6
Q7
Q8
Q9
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paul drumm, mutac jan 2003 27
The Pb-position: Feasible? / Re-examine?
• A scheme had been drawn for supporting the Pb. diffuser in its present position.
Geoffs plot /
• We have a prescription, using a number of codes (G4MICE/BL & TPT/TTL) to re-examine this position if necessary.
0.76cm Pb.
1.2245 m
(Upstream) EndCoil
Pb.
Q9 Downstream Mirror Plate
Q9 Body
Tracker.
0.76cm Pb.
1.2245 m
(Upstream) EndCoil
Pb.
Q9 Downstream Mirror Plate
Q9 Body
Tracker.
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paul drumm, mutac jan 2003 28
Re-examining the Pb-position: 'How-to'
• Can make crude re-est. again in TPT/TTL - checking matched εn for different d
• But to do properly, use G4MICE/G4BL as well as TPT/TTL :-
– New factors (since CERN CM: March'04) :-
• Better comprehension of εn !
• The presence of the upstream iron detector shield.
– The procedure:-
• Work backwards from matched εn=10π (or other max) beam with certain preferred Pb position 'p'. Also choose detector shield position as a variable 'd'? Use G4MICE/G4BL.
• Q: Can beamline supply this beam ? (Use TPT/TTL for quick answer)
• Re-run above test with different detector shield positions 'd' if needed.
• If beamline cannot supply beam, bring Pb position 'p' closer to solenoid & repeat until beamline can supply beam. Finish with the
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paul drumm, mutac jan 2003 29
Beamline design & evaluation
1. Complete geant4 materials reference table. (KW)
2. Complete TTL fitting to materials (KT)
3 Complete MICE-note of above materials modelling work (KT/KW)
4 Produce new beamline design & evaluate (KT/KW)
5. Establish if present Pb-position feasible & proposed mounting (GB/PD/KT)
6. Evaluate impact of chromatic abberations / off-momentum matching (KT)
7. Re-examine beam matching under detector shielding environment (if time) (KT/KW/…?)
Actions
Summary • Progress made modelling beamline materials, and including first few into
TPT/TTL. Progress towards new revision however slower than hoped.• Mechanical support scheme for present Pb position available. Procedure for re-
examining position exists (using G4MICE/BL & TPT/TTL) if so needed.
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paul drumm, mutac jan 2003 30
Beamline engineering talk
P. Drumm, RAL, 9th Feb
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paul drumm, mutac jan 2003 31
Beamline Engineering
Discussion Items • Beamline vacuum system outlined:
– ISIS Vacuum, Air-gap, Beamline Vacuum, Decay Solenoid Vacuum. UHV?– No vacuum system in Muon Channel (Air only, He?)
• Beamline magnet mounting & alignment– Quad Triplets aligned together, girder, away from beamline.– Mounting stands need to be designed
• Radiation shielding concept:– Light concrete wall partitioning off entry area of beamline into MICE-Hall– Steel only in direct line of sight from MICE-Hall to synchrotron RF cavity. (protecting from fast neutrons)– Work ongoing with MCNPX
• Coordinate systems:– Number of coordinate system, potentially confusing (TPT system, MICE-centre)
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paul drumm, mutac jan 2003 32
Beamline Engineering
Actions
Summary • Number of beamline engineering issues presented: vacuum system concept,
magnet mounting, hall radiation shielding (using MCNPX).• Point raised about existence of number of different (& therefore potentially
confusing?) coordinate systems. (TPT system, MICE-centre…)
1. Estimate physical space/mounting needed for beamline diagnostic devices (KW/KT)
2. Identify Target monitoring, controls & services needs. Determine physical location & possible commonalities eg. with other control equipment. (CB/PD)
3 Resolve radiation shielding needs (PD)
4. Provide TRD subsection explaining relation of TPT coordinate system to MICE coordinate system. (example=Pb position) (KT)
5. Ensure beamline engineering update at June Collaboration meeting (some topics = stands, alignment, target, cyro, quad-refurbishment…) (PD)