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Agenda for Tile-HCAL main meeting, 2.7.03, 8:30-17:00

Agenda for Tile-HCAL main meeting, 2.7.03, 8:30-17:00. Introduction VK Status of TFS R&D ITEP/MEPhI M. Danilov LPI A. Terkulov

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Agenda for Tile-HCAL main meeting, 2.7.03, 8:30-17:00

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  1. Agenda for Tile-HCAL main meeting, 2.7.03, 8:30-17:00 • Introduction VK • Status of TFS R&D • ITEP/MEPhI M. Danilov • LPI A. Terkulov • DESY A. Terkulov, S. Reiche • Status of: • --Photodetectors • MA-PMs S. Reiche • SiPMs E. Popova • APDs J. Cvach • --Preamps I. Polak, VK, ... • --Other topics V.K., ..... • --HV/LV power supplies and voltage distribution • --minical installations • --LED monitoring, calibration • The minical DAQ, overview Erika Garrutti • First results from minical multi-cell studies with LED, cosmics N.N. • The DESY electron test beam, • resume from yesterdays meeting V.K. • The program of the minical tests V.K. • contribution of external institutes to analysis of test data ...., discussion Continued >>> V. Korbel, DESY

  2. Program of the Japan ECAL tests at DESY V.K. • Status of scint. Calo studies at NIU Vishnu Zutshi • Future: speakers, volunteers...? • --Simulation • plans for simulation studies R. Poeschl • programs available for simulation studies V. Morgunov • --The status of PPT h/w V.K., all • the stack structure, granularity studies, design • active equipped detector volume • which scintillator tiles to use • which quantities of photodetectors to use • materials to order!!!! Discussion,.... • tail catcher N.N • --VFE RO board, status of Dubna studies Igor Tiapkin • --the DAQ h/w for the PPT beam tests Paul Dauncey • --concepts of DAQ s/w for beam test .... • --global detector network ? .... • Conclusions, next main meeting, V.K. • proposed: 14.8.03, DESY?? Agenda for Tile-HCAL main meeting, II V. Korbel, DESY

  3. Talks of: • Jae Yu, Univ. of Texas at Arlington, GEM chambers for Digical, 3M, 40 000$/m2 • Vishnu Zutshi, scint. Digical >> today • V. Ammosov, status of RPC, FE • I. Tiapkin, Digital FE electronics • J. Repond, FE for RPC type PPT, 6250 ASIC’s (64 channels each) , FNAL • VK, PPT stack structure, >> see today's meeting • V. Gapienko, simulation studies, digital gas/scint. vs analogue HCAL • J. Repond, simulation studies from L.Xia, (Argonne), • radial shower shapes in gas and scint. • >> all talks will be in the web these days... • Next meeting of DHCAL end Oct. 03, day later Tile-HCAL main ? • Some remarks: • mean shower radius is larger in scint. than in gas Digical • this comparisons are irrelevant for the analogue Tile-HCAL • where we measure energy instead of pad patterns • 400 000 channels needed for 1x1 cm2 cell Digical (~200 000 Euro) • agreement found to use common PPT stack structure with fixed gap width • 2 identical (?) stacks needed ( 6 t each) for 2 different test-beams • nobody thinks so far on FE for semi-digital RO, 2-3 bit/channel? DHCAL meeting at the 30.6.03 V. Korbel, DESY

  4. What has been achieved so far ? • TFS in production at DESY and ITEP: • 117 TFS with SiPM’s in ITEP/MEPHI, scint from Vladimir • 126/126 TFS from BC-408/SC-306(Protvino) • diagonal curved grooves, machined at DESY • 60 cm WLS-fibres are ready and polished • BC-408 ready, TFS production is under way • Protvino tiles machined in 2 weeks? • first TFS studies in minical with BC-408 and 3MA-PMs now • 36 pixels with 3/4 fibres to pixel in this month • minical modification in 1-2 weeks, • support bars for tilt to beam and crane handling • increase gap width by 0.6mm (to confirm by measurements) • minical electronic window ready, carries 3 MA-PMs and 36 pre-amps • DAQ software is set up, needs data for improvements and optimisation • Have plans/concept to put actual data on web for distributed analysis V. Korbel, DESY

  5. What next? • 14+(6) APD’s arrived at DESY, 20 more to be handed over in Prague • APD test at CERN/CMS, 4.-5-7-03, 20 APD’s only • other 20 to test in 2 weeks in Prague or CERN? • 25 pre-amp-chips from LAL arrive the 26.6.03 ??? • Pre-amp cards designed and ordered in Prague • pre-amp cards (3 with 18 channels each) available end July • need to order soon more super-reflector, new type? V. Korbel, DESY

  6. APD-test at CERN • With use of CMS test lab. and standard CMS preamps: • gain vs bias voltage • can we achieve a gain of 200 (500) ?? • capacity vs bias voltage (in 25 pF range?) • dark current vs bias voltage • excess noise??? • >> need quick answer whether we accept these APD‘s V. Korbel, DESY

  7. Design of pre-amps for APD‘s • 18 channel pre-amp cards • 3 cards needed + 1 spare • 2 mask for 9 APD‘s each, 5 mm sockets • APD photo-cathode is 3x3 mm2 • 4 holes in mask for mixing of 4 TFS-fibres • + 1 hole for LED-fibre • 5 masks to produce... • 18 potentiometers to adjust bias voltage • coupling capacitors to pre-amps (10 nF, 500V) • socket for 18 channel special LAL-pre-amp • line drivers to feed 30m LEMO cables to ADC’s V. Korbel, DESY

  8. DESY test-beam, „Strahl 21“ • energy 0.5 to 7 GeV, 1KHz (3 GeV) to ~1Hz (~ 7GeV) • need vacuum beam line in test area to get proper >5 GeV ?? • rates sufficient to get >10000 event samples • spill structure: 1 MHz, 80 msec periods, • repetition rate: 12.5 Hz • beam availability in 2003/2004/2005 • test in magnetic field? Which field strength? 2 solenoids, 1.0T • free diameter ~70cm • test in H1-compensator, 4T, free diameter? • all information on beams, energy resolution, rates, operation,.... • >>> folder of collected documents, copy in counting room • groups interested: • KEK/Tokio (Sept. 2003) • CALICE ECAL (later this year?) • Univ. of Texas, digital scint. (2004?) • Most groups of RPC or GEM digital HCAL V. Korbel, DESY

  9. can we use drilled center hole? V. Korbel, DESY

  10. Manpower for minical test at DESY V. Korbel, DESY

  11. The minical program V. Korbel, DESY

  12. The minical program V. Korbel, DESY

  13. purpose of the beam test at DESY in 2003 • Tohru Takeshita of Shinshu University • Yoshiaki Fujii, KEK • (1) co-working with people who are interested in plastic tile calorimeter. • (2) to test the performance of the direct attached APD shower-max • detector by electron beams. Especially the position resolution. • (3) to test the fine segmented pre-shower detector whose read • out is via optical fibers by electron beams. Especially the • position resolution. • (4) to train young students having experienced at DESY. • (5) we need your detector to measure the energy behind ours. • (6) would like to use the Tile-HCAL DAQ KEK, the minical program V. Korbel, DESY

  14. KEK, the minical program • Pre-shower, A and B: • 2x20 strips, 20x1x1cm3, • RO with MA-PMs • 2x20 strips, 20x1x1cm3, • RO with 5x5mm2 HPK 8664-55 APD • fibre grooves in centre of strips • 3M radiant mirror film V. Korbel, DESY

  15. Tail catcher 1.8 l coil HCAL ECAL Studies for a CALICE HCAL V. Korbel, DESY

  16. Studies for a CALICE HCAL, some details Single absorber plate handling Adjustment bolts with distance disks Support frame V. Korbel, DESY

  17. 29 layers minical • 3x3 tiles, 5x5cm2 each • thickness: • 5mm tile, • 1mm fibre, • 0.5mm tolerances • 3mm aluminium The active layer Cassette for minical • Questions for PPT: • real overall gap width: 9.0 +/-0.5mm? • thickness of insertion frame: 8.5cm? • 5.0+1.0+0.5 • + 2x1.0mm steel for frame +18mm abs? • stiffness requirements? • material of insertion frame, steel? • less Fe in absorber, more in cassettes? • e.g. 2x2.0mm steel walls and 16mm abs? • size of individual frames, ~1 m2 ? V. Korbel, DESY

  18. Energy weighting optimisation; Simulation study to set to limits to reach: ----split each calo tile in 2 tile-buffers, one for hadronic energy fraction, other for elm. fraction 1. Reconstruct energy without weighting, just sum all tiles 2. ...... With weighting of elm. fraction, optimise weighting to get best energy resolution (s ) of event sample 3. Add elm. and hadr. energy of cells (2 tiles behind each other) try to find cells with dominant elm. contribution, try amplitude dependent weighting, opt. s of sample 4. Compare with 2., optimise identification of “cells to weight” (containing sizeable fraction of elm. energy) 5. Vary cell granularity (1-4 tiles) find optimum s of sample 6. Vary tile sizes, start again at 3. V. Korbel, DESY

  19. Tile-HCAL, Prototype channels, inner core: V. Korbel, DESY

  20. Studies for a CALICE HCAL • PPT: • inner and outer active volume? • tile granularity inside? • cell granularity inside ? • coarse tile/cell granularity outside • ~ 20*20*x cm3 ? V. Korbel, DESY

  21. Studies for a CALICE PPT-HCAL Weight of 38 abs. plates is 6 t ! • Questions to discuss/fixe: • material of absorber plates: • steel • stainless steel • flatness requirements, costs • gap width • gap tolerances • gaps adjustable? • cassettes, material, sizes? • cassette thickness vs absorber plate thickness • final construction of stack module • 1 or 2 modules for different test beams? • Who builds stacks? • test in magnetic field? Which field strength? Probably mini-minical in e-beam V. Korbel, DESY

  22. Minical Outlook Here we are VII, 2003 Prelim. design Final Tile-HCAL concept August 2003 ? HCAL prototype to be built for I, 2004 • Hard work to do soon: • simulation/reconstruction studies • HCAL stack prototype design/construction • specification of TC needed, # of layers,cells • decide on # of photodetectors: • APD’s,Si-PM’s ... V. Korbel, DESY

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