May 16 th 2006M. Bruschi – CSN1 Roma1/20 A. Bertin, M. Bruschi, D. Caforio, S. De Castro, L....

May 16th 2006 M. Bruschi – CSN1 Roma 1/20

A. Bertin, M. Bruschi, D. Caforio, S. De Castro, L. Fabbri, P. Faccioli, B. Giacobbe, F. Grimaldi, I. Massa, M. Piccinini, M. Poli,

C. Sbarra, ASbrizzi, N. Semprini-Cesari, R. Spighi, M. Villa, A. Vitale, A. Zoccoli

Stato del Luminometro (LUCID)

Outline: The Lucid detector Test beam results Tests on Bench The installation scenario The electronics Conclusions


Activities of the Group since Sep.05

Main activities of the Bologna Group in LUCID: development of the electronics Preparation (electronics,daq) Test Beam @ Desy

(Nov. 05) and data analysis Monte Carlo: development and optimization of

the code (to reproduce the test beam results).Simulation of the backgrounds.

Test on bench @ CERN to check the detector performances and tune the MC

Discussion of the detector design and of the installation strategies


LUCID: relative Luminosity MonitoringLUCID : “LUminosity measurement using Cerenkov Integrating DetectorA bundle of ~200 (per end) projective Al Cerenkov tubes around the beam pipe

Cerenkov radiator gas isobutane

Light fed into PMTs via quartz fibres


LUCID position• Planned installation after the Big Wheels A/C.


Test Beam @ Desy (Nov. 05):

The T22 teststand has a SiMS telescope - resolution ≈30µm

The T22 teststand has a SiMS telescope - resolution ≈30µm

(LUCID) (Roman Pot)

Cerenkov tubes

Test beam stand for Roman Pots

Winston cones

window of gas vessel window of gas vessel under pressure test under pressure test

Test Beam stand for LUCID


Test Beam analysisData analysis performed in Bologna together with MC simulations. Fit of a typical ADC spectrum:


Test Beam results

Pressure scan

C4H10

Number of pe’s/Cerenkov-tube for C4H10 at 1 atm. pressure is 5.3 C4F10 pressure scan - essentially the same as that of isobutan Fall of in signal a factor of two in 2 degrees ( nature of LUCID) Disagreement of a factor ~7 w.r.t. MC

Number of pe’s/Cerenkov-tube for C4H10 at 1 atm. pressure is 5.3 C4F10 pressure scan - essentially the same as that of isobutan Fall of in signal a factor of two in 2 degrees ( nature of LUCID) Disagreement of a factor ~7 w.r.t. MC

Angle scan

C4H10

1 bar


Comparison with Monte Carlo

Stage A

Improvements in MC still ongoing (light diffusion, etc.) Checks of the detector performances on bench ongoing

Now MC predictions much closer to RD results: ~10 p.e.


Test on bench: quantities studied


Test on bench @ CERNPerformed under the Bologna responsibility:

Studies on all the different parts of the detector: tube reflectivity between 75% & 95% (depending on the incident angle, typ: 90%), variation up to 10% observed along the tube Not responsible of the poor performances light attenuation along the fibers is about 75% WC – Fiber light collection


Test bench results

All quantities measured on bench.Quite good understanding of the detector performances.


Possible improvements & next steps

Improvements on the detector;• Tubes: improvements in the internal surface (~ 1.1 - 1.2)• Winston cone: new design + internal surface (~ 1.2 - 1.7)• Fibers: improve fiber quality. ~2 less attenuation (at 300

nm), factor of ~2 large angular acceptance plus a larger (core)/(clad) area ratio (0.78 compared to 0.68) ( ~2)

• PM + Fibre: enlarge the light spectrum sensitivity of PM +fibers (UV range) (~ 2)

Possible improvements in light collection: factor ~6/7Next steps:• New tubes + WC + fibers will be delivered @ CERN middle

May Test on bench• Test beam @ CERN end of June to test the new detector• Test beam @ CERN in November to test the final detector


Backup solution (under study)

• Place single miniature PMTs directly onto the end of each Winston cone?

• Advantages:– More light because of direct coupling– Lower electronics cost– Swap quartz fibres for (cheaper) signal

cables• Need to study:

– Radiation hardness of complete PMT system– Background Cerenkov light in window from

primary & secondary particles – Activation– Mechanical design

• Place single miniature PMTs directly onto the end of each Winston cone?

• Advantages:– More light because of direct coupling– Lower electronics cost– Swap quartz fibres for (cheaper) signal

cables• Need to study:

– Radiation hardness of complete PMT system– Background Cerenkov light in window from

primary & secondary particles – Activation– Mechanical design

HAMAMATSU R4296

PMT


Detector installation• The installation of the detector early in

2007 is becoming tight. Need to wait for the test beam results. Problems for the electronic design until the detector performances are fixed.Detailed planning available. Still possible, but no contingency

• Investigating alternative scenarios for a reduced detector (e.g. 1 ring per side). Detector Completion at the first long shut-down (end 2008 ?). Presently under discussion.


Purposes of the LUCID electronics

The Cerenkov tubes based ATLAS luminosity detector has the following main goals:

1. To measure the integrated luminosity per BX2. To measure the luminosity per BX3. To provide a trigger for interaction (at machine low

luminosity) and for diffractive physics

Logic blocks needed to achieve these three points:

• 1) ad hoc front end card• 2) ad hoc readout card • 3) ad hoc trigger card and a detector acceptance as

big as possible


Changes in the electronics design since

fall 2005A very general scheme to fulfill the readout and trigger needs for LUCID was developed in fall 2005Since then, some important changes were achieved:

• Rearrangement of the main logic blocks between the detector and USA 15 (the readout will not be placed in an intermediate rack)

• Front end components (MAPMT, fibers, fed cards, cables) deployment in the nose shielding

• The front end system is now modular so allowing scalability

• A readout and trigger scheme for the backup solution is now available


System Architecture

FRONT END (FEPCB)

Similar to Roman Pot FE:OPERA/MAROC chip Input: MAPMTOutput: DIGITIZEDINFORMATION onoptical Links (~1.5 Gb/s)

Analog Information onCoaxial (or diff. on tw. Pair)

19x2

MAPMT

GOL

LINKS+coax

LHC sync:TTCrq, CTRL sign.,etc

ROS

ROD

ROD

ROD

ROD

TRIGG.

CARD

HV FE CONTROL

PC


The LUCID FED cards

•The front end system is now modular so allowing scalability•The MAROC Boards will be developed by LUND (thanks!)

TX Digital BoardGOL, FPGA, TX

ConnectorsBoard(HV,LV,RX,TX,analog)

MAROC Boards

Base board(only connectors andsignals routing)

ANALOG board(ampl.+line driv.)

RX Digital BoardTTCRQ, volt. reg.


Conclusions/detector LUCID can rely on quite settled technologies both on the detector & the electronics side

Detailed studies on the detector in test-beam and laser tests and a lot more is known (simulation, mechanics, light detection, fiber readout, cabling, electronics placement, readout, etc…). Good chances to improve the light emission by about a factor 6-7.

Improved detector version will be tested in May on bench and in the test beam of June

Large impact of the Bologna Group on all the ongoing activities

Different installation scenarios under discussion. Aim for installation of LUCID in 2007.


Conclusions/electronics The design of the front-end electronics has been

started (although we need a confirmation of the performances of the detector)

The front end electronics (both for the baseline and the backup solution) should be reasonably ready for february 2007

The project is now modular and can easily adapted in case we will decide for the LUCID readout backup solution

The development of the readout and trigger electronics could be a bit relaxed since we can use already available pieces of DAQ to give a luminosity measurement as soon as the front end electronics will be available

First version of MAROC chip including modifications for LUCID submitted on March 6th


Backup slides on detector


LUCID position:

MBTSTILE

ηMAX = 6.073ηMIN = 5.374

Detector goals: provide a relative luminosity measurement

(integrated and bunch by bunch) Provide η-coverage for diffractive physics


Parametrization of PMT spectra


Improvements: Winston cone


Improvements: new fibers


Fiber efficiencyA transmission has been made on the fibers used in the TB.

The quartz fibers have a better transmission than the plastic fibers but this is compensated for by a larger numerical aperture of the plastic (0.51) compared with the quartz (0.37). Same number of p.e. in the test beam


BACKUP SLIDES on electronics


12 m

24 m 12 m

2 m(wall)

Rack?12 m

8 m(MAPMT out)

From MAPMT out to USA15 Total Cable Length: 8+12+12+24+12+2 = 70 mInside USA15: <25 m 80 m < Total Cable Length < 100 m


Baseline Readout Scheme

LUCID1

Nose Sh. USA15~4m ~80-100 m

Optical fibers

MAPMTMAROCDRIVERS

COAX (or tw. pair) +Optical fibers

READOUTTRIGGER

Total number of channels: 168x7x2=2352 for 19x2 MAPMT


Electronics and Cables placement


Electronics

GOL

First version of MAROC chipincluding modifications for LUCIDsubmitted on March 6 th(thanks to the ORSAY group!)


General Comments• The TDC in the readout block will be

probably be replaced by a simple gated coincidence

• In case the LUCID readout backup solution would be preferred, then:

- The MAROC chip will not be used

- The FED cards will contain only the ANALOG board

- The STRU unit of the readout card will be simplified


Single Tube Readout Unitfor PMT (1 channel)

15 nsint

10 nsreset

25 ns

time

time

LHC Clock

LHC Int. Time

ADC GATE

TDC START

to thetrigger

unit

FanOut

TDC

GI+

ADC

Multiplicity per Tube

LUT

8

8

3

PMT output

STRU

Discr. (Prog.

Thr+NR)

TDC START

STOP

ADC GATE


Possible Initial DAQ scheme for MAPMT readout (digital

part)

SBC

LTP

TTCVI

TTCEX

TTCOC

CTP

FilarCards(PCI IF)

ROS

EthernetLink

To LUCIDFED

2 ServerComputers

from LUCIDFED


Q.ty Units MIN MAX MIN MAX

MAPMT 2 unit/ROD 1300 1400 2600 2800

MAROC 2 unit/ROD 25 500 50 1000 a multiproject of 20 keuro (shared?) is assumed

CONNECTIONS (incl. connectors)

coax cables 20 100m/ROD 80 80 1600 1600 suhner gx 02272 + SMB connectorsoptical fibers 1 100m/ROD 700 700 700 700 Optical fiber with connectors (bundle of 12)optical fiber 1 100m/ROD 100 100 100 100 Optical fiber for TTCRQHV cables 4 100m/ROD 100 100 400 400TOTAL CONNECTIONS 2800 2800FRONT END (FE)

GOL 9 unit/ROD 15 15 135 135TTCRQ 1 unit/ROD 100 100 100 100FPGA 1 unit/ROD 200 200 200 200Amplifier, drivers, voltage reg., etc 1 unit/ROD 300 300 300 300Agilent TX 1 unit/ROD 500 500 500 500Samtec connectors 8 unit/ROD 10 10 80 80TOTAL FRONT END (MATERIAL)/ROD 1315 1315

READ-OUT BOARD (ROD)

LHCb PS Gated Integrators 5 unit/ROD 100 150 500 750 purchased directly by LHCb outlet (2500 chip)8 bit ADC 40 MSPS 20 unit/ROD 5 10 100 200 investigate LHCb PS FE solutionTDC 10 unit/ROD 20 35 200 350 gated coincidence or CERN HPTDCTTCRQ 1 unit/ROD 100 100 100 100

S-LINK (incl. cable) 1 unit/ROD 200 200 200 200VME IF FPGA 1 unit/ROD 50 50 50 50CTRL LOGIC FPGA 1 unit/ROD 75 75 75 75STRU LUT,DPRAM,EVENT BUFF. FPGA 20 unit/ROD 75 100 1500 2000GOL 9 unit/ROD 15 15 135 135Agilent RX 1 unit/ROD 500 500 500 500TOTAL ROD (MATERIAL) 3360 4360

TRIGGER BOARD (TB)

TTCRQ 1 unit/TB 100 100 100 100

S-LINK (incl. cable) 1 unit/TB 200 200 200 200VME IF FPGA 1 unit/TB 50 50 50 50CTRL LOGIC FPGA 1 unit/TB 75 75 75 75TRIGGER PROCESSING UNIT FPGA 1 unit/TB 1500 1500 1500 1500TOTAL TB 1925 1925

VME+PC

VME 9U CRATES 2 unit 7500 7500 15000 15000VME CPU 2 unit 4000 4000 8000 8000PC 2 unit 1700 1700 3400 3400TOTAL SYSTEM 26400 26400

Item CommentsUNIT COST

(EURO)

TOTAL COST

(EURO)

ITEM UNITS PROD MIN MAXFACTOR (EURO) (EURO)

MAPMT 38 49400 53200MAROC 38 950 19000

FE 20 2 52600 52600ROD 20 2 134400 174400TB 1 2 3850 3850

CABLING 20 56000 56000

VME+PC 1 26400 26400

TOTAL 323600 385450

COSTS SUMMARY

COSTESTIMATE

(must be updated With MAROC boardsCost ~ 10k€)


FED TIME SCHEDULE for FED


Single PMT readout• The candidates PMT are Hamamatsu R2496

with quartz window• <IA> < 15 A (could be 30 A with active

divider) with HV=1250 V• Number of photons @ 1 bar 400 (MC/8 Feb.

2006)• QE ~ 20%• 15 A>400x0.2x1.6x10-19xGPMTx40MHzx0.3

GPMT≤105 QMAX~1.3 pC (signal duration 10 ns) Vsig ~ 13 mV


stru 1stru 2

stru 20

SUM_OUT 1_1

SUM_OUT 1_2

SUM_OUT 2_10

GOL 1

GOL 2

GOL 9

GOLRX

LVDSS/P

3

3

3

LVDS 1_1 (to trig. unit)




stru 2

TTCRQ i.f.opt. lnkfrom TTCEX

VME P1VME I.F

DPRAMDPRAM

DPRAM

CTRLLOGIC

6 Bytes

6 Bytes

6 Bytes

EVENTBUFFER

s-LINKto ROS

from CTRL LOGICfrom CTRL LOGIC

160 MB/s

s-LINK Busy

LUCID ROD BOARD (22 units + spares) – VME 9U

Analog_In 1

Analog_In 2

Analog_In 20

GOL_In 1

GOL_In 2

GOL_In 9

~200 Bytes/ev


SignalBuffer

TTCRQ i.f.opt. lnkfrom TTCEX

VME P1VME I.F

CTRLLOGIC

s-LINKto ROS 160 MB/s

s-LINK Busy

LUCID TRIGGER BOARD (1 unit + spares) – VME 9U

Detector

1

Detector

2

LVDS 1_1

LVDS 1_2

LVDS 22_1

LVDS 22_2

1

2

43

44

LVDS 23_1

LVDS 23_2

LVDS 44_1

LVDS 44_2

1

2

43

44

SignalBuffer

FPGA basedTRIGGER

PROCESSINGUNIT

44 ser. Inp594 bit/BX

44 ser. Inp594 bit/BX

to the L1 trigger

~200 Bytes/ev

Algorithm:MC simulations are needed


MAPMT readout• The candidates MAPMT are Hamamatsu

H-7546-03 with UV glass (or quartz?)

• <IA> < 100 A (8 stage boosted divider) with HV=1000 V

• Number of p.e. per channel: 5

• (100 A/64)>5x1.6x10-19xGPMTx40MHzx0.3

GPMT≤1.6x105 QMAX~0.13 pC (signal duration 10 ns) Vsig ~ 1.3 mV


MAROC analog output characteristics

• 25 mV/160 fC typical output from single fiber (130 fC)

~ 20 mV • Typical output from 7 fibers ~ 140 mV


Cabling

• The readout of the front includes both analog and digital signals transmission

• For the analog ones:single ended on coaxial (but: differential on twisted pairs under consideration)

• For the digital ones: optical fiber is the baseline


( )4

( )( , ( ), ) 2(3)

(2 10, . . )9 1 10 10 1

63 80 5.04

CABLES multiconductorHV

MAPMTCABLES LV power

LV GNDMAPMT

SUM MONITOR SIGNALS COAX CABLE sh tw pairsANALOG

MAPMT MAPMT MAPMT MAPMT MAPMT

Mbit GbitDIGITAL

MAPMT M

( )4

1.5 CABLES CABLES fibers

APMT Gbit MAPMT

Cables Summary

•Globally we will have 2x19=38 MAPMT


General Considerations-III• For the description of the readout electronics I will refer essentially to the

baseline of the detector described in the LOI

• Detector:formed by two parts each one consisting of 200 Cherenkov counters (tubes) 5 layers/section x 40 tubes/layer x 7 fibers/tube x 2 sections = 2800 fibers

• Signal:Prompt particles coming from the IP (primaries) will traverse the full length of the counter and generate a large amplitude signal in the photo-detector

• Background I: Particles originating from secondary interaction of prompt particles in the

detector material and beam-pipe (secondaries) are softer and will traverse the counters at larger angles (multiple reflections), with shorter path lengths

Background I significantly smaller than signal• Background II:

Particles crossing the readout fibers will produce light only on the crossed fibers

Background II will have different pattern of hit fibers wrt signal

May 16 th 2006M. Bruschi – CSN1 Roma1/20 A. Bertin, M. Bruschi, D. Caforio, S. De Castro, L....

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Transcript of May 16 th 2006M. Bruschi – CSN1 Roma1/20 A. Bertin, M. Bruschi, D. Caforio, S. De Castro, L....