lc-cal mtg, 09-12-02ecfa-desy 2002 ws summary dhiman chakraborty 1 summary of calorimetry sessions...

LC-cal mtg, 09-12-02 ECFA-DESY 2002 ws summary Dhiman Chakraborty

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Summary of Calorimetry sessions at ECFA-DESY ‘02

http://www-hep2.fzu.cz/ecfadesy/Talks/Calorimetry

Dhiman [email protected]

Northern Illinois University (NIU)/ Northern Illinois Center for

Accelerator and Detector Development (NICADD)

http://nicadd.niu.edu/

American LC calorimetry meeting09 Dec, 2002

mailto:[email protected]

mailto:[email protected]

http://nicadd.niu.edu/


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Distributions discussed at LCD-Soft workshop at NIU, Nov 2002.

Deposited energy by 400 GeV electron in VFE

News

CALICECALICE ECAL silicon-tungsten study

(J-C. Brient, CALICE)


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Impact from dead wafersImpact from non-uniformity (inter-calibration)

Response non-uniformity in ECAL (%) Fraction of dead wafers in ECAL (%)

ECAL silicon-tungsten studyECAL silicon-tungsten studyCALICECALICE


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400

GeV

ele

ctro

n

Simulation of the maximum energy deposited by e.m. showerin a (10m)3 of silicon (input transistor of preamp. in VFE)

Discri. cut

Following this crude estimation, VFE inside seems possibleDefinite conclusion with VFE in beam !!!

ECAL silicon-tungsten studyECAL silicon-tungsten studyCALICECALICE


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CALICECALICE

Tungsten in production at ITEP and IHEP

Silicon wafers In progress at IP-ASCR (See Ondrej) and MSU (very

good IY for the first 30 wafers)VFE

in test for final design at Orsay LAL DAQ

in design in UK (VME)some study on use of PCI (LLR) or even USB slot

(SNU) !!!Mounting / final test bench

in design in at LLR

ECAL silicon-tungsten studyECAL silicon-tungsten study

End 2003 – ready for first cosmics testSummer 2004 – ready for first test beam


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DHCAL R&D in Russia: status & plans

(V. Ammosov) • Tuning of RPC performance– Decided to use glass for anode and cathode – Decrease the charge in the gas gap– Aim: minimize aging effects and maximize

rate-handling capability.– Joint adjustment of detector and RO

electronics.

RPC design for DHCAL

N Item Thick, mm123456789

Anode printed boardInsulated mylarGraphite coverageGlass anodeGas gapGlass cathode Graphite coverageInsulated mylarCathode PB

1.00.10.10.51.20.80.10.20.5

Thickness budget 4.5

Anode PCB – internal surface for pads,external one for RO electronicsCathode PCB – internal surface forlong strips for QDC read out (control)

R&D plans• design and tests of approach-0 for RO electronics (step 1) Dec02

• tuning of RPC performance to Dec02 decrease the gap charge

• design of a small RPC plane Dec02

• construction of this plane with a few hundred RO channels (step 1) Mar03

• beam tests of this plane in IHEP Apr03


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DHCal Energy Resolution(K. Beloous)

• Each distribution is fitted by a Gaussian

• Fit is iterative in the specified interval

/ is used as E resolution

• Some problems at low energies.

• The results of the fitting procedure is not stable with respect to changing low limit of the fitting region.


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Energy resolution

Response for K0L


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Cell sizeNumber of hits strongly depends on the size of the cell.

It reaches rather small value of 17 hits for cell size 5 cm.

This leads to some dependence in energy resolution, more pronounced at low energies.


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E/E = 6% + 101% / E

E/E = 0% + 160% / E

Energy resolution for different Cell sizes

13ECFA-DESY 2002 ws summary Dhiman Chakraborty

LC-cal mtg, 09-12-02

•Some resolution improvement when increasing the efficiency

•The improvement has almost the same order of magnitude for different energies

Read-out efficiency


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Signal overlapping

• Charge leakage - ionization produced by a particle could induce charge not only on the nearest Pad but on some of it neighbors

• Crosstalk - read-out of the channel could cause other channels to be fired

under assumption that signal overlapping does not depend on particle energy or position and therefore stays the same for each hit


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• Number of additionally fired cells is calculated through Poisson distribution

• Energy resolution practically does not depend on signal overlapping


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Conclusion

• Some obvious dependencies of energy resolution– decreasing when the cell size increases– small improvement when the read-out

efficiency increases

• Energy resolution practically does not depend on signal overlapping

• Choosing of the cell size can done after studying the reconstruction.


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The tile Scintillator-Si LC cal project

(P. Checchia, INFN)

•Prototype description

•Production

•Beam test results

•Future plans

A lot of interesting material, see original slides online.


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Detector Assembly:45 Layers calorimeter prototype completely built and ready for test

Fibres grouped into 25x4 bundles making a 4-fold longitudinal segmentation.

Slots for the insertion of the 3 Si pad planes (Motherboard).

Mechanical support for photodetectors almost ready (Frascati)


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Test beam* resultsSet up:

•2 planes Si μstrip telescope

•2 trigger Scintillators

•Calorimeter first segment (2 X0) read by PM

•1 Si pad detector

*CERN SPS H4

beamcal

e- 40 / 50 GeV

π 50/150 GeV (used as m.i.p.)


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Test beam results CALORIMETER (2.1 X0)

4 layers

m.i.p.→check light output and uniformity in Light collection:

Ratio signal/sigma →lower limit for photoelectrons

Nphe>5.1 /layer

→ cal(45layers):>220 phe/m.i.p. ± 20%

good uniformity:

Simulated Light collection disunifority(20%)


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Test beam results: Si pad detector (Energy Measurement)

No saturation!

m.i.p. Signal >4 sigmas (coherent noise subtraction not optimized)

Pedestals

e/ behaviour clearly

different

50 GeV electrons

150 Gev

50 GeV electrons


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Test beam results: Si pad detector (Position Meas.)

10 GeV simulated electrons

Position resolution < 2mm in agreement with Monte Carlo

50 GeV electrons

40 GeV electrons


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Future Plans

• insert Si planes (this month)

• go to test beam (low energy Frascati, high energy DESY/CERN)

• analyse two particle impact

• substitute the absorber: Pb to W (next year)(?)

• study new optical device (i.e. multianod PM’s)

• combined test with HCAL(?!)

•Why do not insert other (Prague) Si detectors(?)


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Conclusions• The proposed prototype is going to be completed (just

insert Si planes)• A preliminar beam test at CERN with a partial set up gave

reasonable and incouraging results• Tests with the complete detector are necessary to answer to

all questions (be patient for some months)• …. but it they will be successfully answered, why do not

include a calorimeter made following this technique into the general LC simulation and Pattern recognition? (this is also a PRC recommendation)


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TESLA tile Hcal: status and plans(V. Korbel, DESY)

• Many interesting ideas and results, see original slides online.

• Also another talk about Korbel’s findings from his visits to several industrial vendors in Russia.

New Results and further Plans for the

TESLA Tile HCAL What did we establish so far ?

Found:•scintillators with sufficient light yield•tile reflectors with >98% reflectivity•WLS fibres with acceptable secondary light production•TFS coupling geometry with good LY and response uniformity•a couple of photodetectors with good signal/noise ratio for MIP’s•a half dozen preamp prototypes are in design or available

Documented in:V. Korbel, The Tile-HCAL Calorimeter for the TESLA Detector,a Status Report, CALOR2002, Pasadena, March 2002, http://3w.hep.caltech.edu/calor02http://www.desy.de/~korbel/see/pasadena.ps

V. Korbel, Status report on the TESLA Tile-HCAL, ECFA-DESY workshop, St. Malo, April 2002,http://www-daphnia.cea.fr/ecfadesy-stmalo/Sessions/korbel/ppthttp://www.desy.de/~korbel/see/stmalo.ps

9 3/5/02

V.Korbel, DESY


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New Results and further Plans for the TESLA Tile HCAL

continued........J.Cvach, Calorimetry at a Future e+e- Collider, ICHEP02, Amsterdam, July 2002,http://www.desy.de/~korbel/see/ichep02-cvach.ps

V. Korbel, Progress Report on the TESLA Tile-HCAL, LCWS2002, Jeju Island, Korea, September 2002, Proceedingshttp://www.desy.de/~korbel/see/lcws2002_korbel.pdf

The CALICE Collaboration, Progress Report on Calorimeter R&D for the Future Linear Collider,Memorandum from the CALICE Collaboration to the DESY-PRC, Oct. 2002http://www.desy.de/~korbel/see/PRC_Oct2002_docu.pdf

V. Korbel for the TESLA Tile-HCAL group, The Tile-HCAL Calorimeter for the TESLA Detector, a Status Report on the R&D-Studies for the DESY-PRC, Oct. 2002http://www.desy.de/~korbel/see/tile-hacal-rd2002.31 pages, with a lot of further references, a draft for a NIM or DESY paper

What did we establish so far ?

New Results and further Plans for the TESLA Tile HCAL

What are the next steps ?

Study:•performance and improvement of cheaper Russian scintillators•optimisation ideas for the optical transmission path•tile production technologies: casting, extruding, machining...•optimal tile sizes, arrangement in detector layers, granularity of cells•final design of the HCAL prototype structure•improvement of possible photodetectors in performance, package density and cost•appropriate preamps to be optimised for the different photodetectors•operation of a pre-prototype (mincal) at DESY


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more on scintillatorsBest scintillator: is BC-408 on base of Poly-Vinyl-Toluene >>> 25 pe/tile(5x5 cm2) measured in Hamamatsu MA-PM >>> about 600 photons on photocathode but BC-408 is rather expensive, need 6950 m2, ~ 36 tRussian scintillators:(Protvino and Vladimir)

•production factories and good experience available•scintillator is 5x cheaper than Kuraray, Bicron•LY is about 60-70%, •Cleaner material: Dow Chemical STYRON 663 (P-Nr 35886)•better surfaces ?

investigations to get


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more on fibres

ITEP:Study again effect of varied fibre doting:

Y11(100), Y11(200), Y11(300)find optimum

FH Friedberg:Study 2 new Bicron fibres:

“DAYGLO”-experimentalBCF-99-06, red sensitive


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more on tile-fibre couplingsThis are the fibre coupling shapesfinally selected from 10 different geometries.a,b preferred for BC-408 tiles,c for Russian PS tiles and large BC-408 tilesIt turns out that proper fibre gluing in grooves is difficult,risk of deteriorating the smooth surface.

TFS wrapped with3M-Superreflector

a

b

c


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Detailed investigation of available photodetectors:

APD’s: gain 300-500CMS-type, 5x5mm2

S5344, 3x3mm2, S5355, 5x5mm2 S8664-55, 5x5mm2

S8550, 32 pixels of 1.6x1.6mm2

Si-PM’s: gain 105

MEPHI, 1x1mm2, MA-PM’s: gain 106

H8711-10, 16 pixels of 4x4mm2 R5900-00M16, 16 pixels of 4x4mm2

800-1200 Photodetectors needed (APD or MA-PM’s)3200-4800 Si-PM’s of 1x1mm2 needed alternatively

More on photodetectors


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more on preamplifiersCMS/DESY

APD’s: trans-impedance type, tested with APD’s, cheapPM’s: voltage preamps, 10x gain, from H1 FPS, cheap

Minsk/Protvino:2 types tested with APD and MIP’s10 preamps available100 preamps in february 2003, ~ 3 Euro/channeldesign of 16 channel multilayer PC: ~ 8000 Euro needed

OPERA/Orsay/Calice ECAL:prototype: ~10 mm2 preamp chip, OPERA type for APD and PMsNov./Dec. specification of modifications, Prague/Orsay activitythan submission of test production order, ca 4000 Eurodelivery May/2003 about 15 boards with 16 preamps?

Prague: for APD’s,see Ivos talk


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MINICAL set up, November 2002

Operation start up at 14.11.02•Position in test beam area, with connections from beam-test equipment•2 trigger counters, 20x20 cm2, with own PM’s, movable position in stack•4 tile planes with individual TFS to insert•Tile plane: millimeter paper to ease adjustment of TFS, double side glue scotch to fix TFS•Connection to PD’s via ~50 cm long WLS fibres•16 PM-channels, =1 Hamamatsu H8711-10 first than ~ 10 APD’s with CMS/DESY-preamps•than 1 more Hamamatsu H8711-10•also ~ 16 Si-PM’s•preamps from DESY, ITEP, Orsay, Prague

The MINICAL studies, 1


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•Calibration with LED pulsesLight pulses of a single LED distributed to PM’s via additional calibration fibres PM-masks (Prague) with 4mm hole, to hold to 4 fibres at once:(3 signal fibres from tiles, 1 LED fibre)

•LED signal amplitude measured also by a photodiode stable vs T and U shift •To study:

LY (>15pe) Uniformity (<3-4%) Gain Noise separation from MIP peak (>4) Stability (<1%) Calibration precision with MIP’s (< 2%) Useful rates (> 0.1Hz?)

The MINICAL studies, 2


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The MINICAL studies, via web

Install in minical:different•scintillators•fibres•photodetectors•preamps•supply voltages•trigger conditions

Look for:•gain•stability•signal width•signal noise separation•calibration with MIP’s•run parameter file

LED monitoring

Study the results of up to 64 channels with MIP’s

ITEPLPIMEPHIPragueProtvinoDESY....

At DESY:

via web:

Start run withnew componentsor new settingsall 24 hours.

very similar later during prototype running in


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The structure (from top to bottom):•plastic air bag layer, 500 m ?•support layer (steel or C-fibre)•long RO fibres•reflector layer•tile-WLS fibre arrangement•glue•reflector layer•glue•support layer (steel or C-fibre)

The Tile-Detector-Cassette

a

a= 6.5 cmb=1.12-1.67mc= 2.75 m

b

c

The structure:


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time schedule for the HCAL prototype (2003/2004), I

1. Selection of appropriate photodetectors (APD’s and Si-PM’s) up to January, followed by ordering larger quantities for tests in minical (Febr.)

2. Selection of Russian scintillator to use, up to March

3. find optimal cell and tile sizes, from software and hardware studies, decision February

4. ordering Bicron BC-408 for the larger tile sizes, about 10 m2, up to February

5. studies and development of integrated preamplifier/shaper circuits, up to February

6. design of the PT stack, May

7. building of stack steel absorber structure > August (in ITEP ?)


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time schedule for the HCAL prototype (2003/2004), II

8. casting/machining of tiles or tile-plates up to September, (in factory ?, machining at DESY?)

9. a detailed tile-plate assembly concept has to be defined (July)

10. assembly of the TFS in detector cassettes, October

11. connection with photodet. and preamps, November-December

11. RO via CAMAC as long as British DAQ not available, end 2003

12. winter 2003/2004 operation studies with LED gain monitoring, and calibration studies with cosmic muons

13. setting up RO and reconstruction software up to spring 2004

14. transport to CERN in spring 2004

15. first test-beam runs at CERN in May/June 2004

lc-cal mtg, 09-12-02ecfa-desy 2002 ws summary dhiman chakraborty 1 summary of calorimetry sessions...

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deposited energy

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