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New Results and further Plans for the TESLA Tile HCAL

What did we establish so far ?. New Results and further Plans for the TESLA Tile HCAL. 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

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New Results and further Plans for the TESLA Tile HCAL

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  1. What did we establish so far ? New Results and further Plans for the TESLA Tile HCAL • 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/calor02 http://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/ppt http://www.desy.de/~korbel/see/stmalo.ps 16.11.02, ECFA-DESY, Prague

  2. New Results and further Plans for the TESLA Tile HCAL What did we establish so far ? 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, Proceedings http://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. 2002 http://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. 2002 http://www.desy.de/~korbel/see/tile-hacal-rd2002. 31 pages, with a lot of further references, a draft for a NIM or DESY paper 16.11.02, ECFA-DESY, Prague

  3. What are the next steps ? New Results and further Plans for the TESLA Tile HCAL • 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 16.11.02, ECFA-DESY, Prague

  4. Systematic studies for TFS optimisation, I FPOF=WLS Light emission of different short WLS-fibres illuminated with room light Light emission for BC-91A illumination across fibre diameter spot of 100mm, 0 = fibre center 16.11.02, ECFA-DESY, Prague

  5. Systematic studies for TFS optimisation, II Light source 40 cm Light yield for 3 short WLS-fibres normalised to source photo-current at l = 500 nm >>>only scintillation light with l < 470 nm is useful • LE-peak of: • BC-408: 425 nm, • BC-404: 408 nm 16.11.02, ECFA-DESY, Prague

  6. Systematic studies for TFS optimisation, III Light emission/attenuation in WLS fibres: 10,40,90 cm, BC92,BC91A,Y11 • Study of • light emission and absorption in • commercial WLS and • optical clear fibres • adjustment of spectrum offered to PD • to the specific PD photocathode sensitivity • Niko Kakalis, FH Friedberg, • Diploma Thesis, Prof. Klein and VK 16.11.02, ECFA-DESY, Prague

  7. fibre-fibre connection WLSfibre to clear fibre: standard is gluing with optical glue new procedure: fusing, ~ 80-120oC, heating by 1-2 windings of resistive wire fibres cut, adjusted and pushed together in glass tube of 1.10 mm inner hole diameter few A current for a few sec. >> connection difficult to find by eye no light loss seen at connection first results: 84% transmission assume a large improvement potential is still available in this process 16.11.02, ECFA-DESY, Prague

  8. more on scintillators • Best 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 t • Russian 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 16.11.02, ECFA-DESY, Prague

  9. 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”-experimental • BCF-99-06, red sensitive 16.11.02, ECFA-DESY, Prague

  10. more on tile-fibre couplings This are the fibre coupling shapes finally selected from 10 different geometries. a,b preferred for BC-408 tiles, c for Russian PS tiles and large BC-408 tiles It turns out that proper fibre gluing in grooves is difficult, risk of deteriorating the smooth surface. b a c TFS wrapped with 3M-Superreflector 16.11.02, ECFA-DESY, Prague

  11. and more 10 x 10 cm2 PM • Very proper treatment • is important!! • Reproducibility? • Ageing? 16.11.02, ECFA-DESY, Prague

  12. more on tile sizes 38 layers require 38 different tile sizes casting with minimum number of moulds! 16.11.02, ECFA-DESY, Prague

  13. More on photodetectors • Detailed investigation of available photodetectors: • APD’s: gain 300-500 • CMS-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 16.11.02, ECFA-DESY, Prague

  14. More on photodetectors Detailed investigation of available photodetectors with 55 cm2 scintillator tiles in test beams MIP peaks clearly separated from pedestals. • satisfactory performance • none yet tested in high field • several ( all ?) will be used in prototype to gain operation experience Hamamatsu,multianode PM,44mm2pixel MEPHI, Si-PM, 11 mm2 pixel Hamamatsu,APD, 55 mm2 Hamamatsu,APD-array,11 mm2 pixel 16.11.02, ECFA-DESY, Prague

  15. Multianode-PM’s At DESY: Performance studies: H8711-10, 16 pixels of 4x4mm2 Pavel Murin, Stefan Valkar --gain variation: all signal within 100-74% at 850 V 100-70% at 800 V 100-64% at 750 V 100-60% at 700 V 100-70% at 650 V --X-talk from 1 channel to all other 15 cells: 2-6% 16.11.02, ECFA-DESY, Prague

  16. Si-PM’s (MEPHI), dark rate and MIP detection From Elena Popova 16.11.02, ECFA-DESY, Prague

  17. APD’s Hamamatsu, 3x3mm APD, S5344 ? typical performance: M= 50 100 Id 600pA 1.2nA C 28pF 28pF 30 samples by Jan. 2003, FOR TEST samples will be in S8664-55 PKG. 60 EURO for 1500 pcs GAIN M C 100 Id 10 500 V 16.11.02, ECFA-DESY, Prague

  18. more on preamplifiers • CMS/DESY • APD’s: trans-impedance type, tested with APD’s, cheap • PM’s: voltage preamps, 10x gain, from H1 FPS, cheap • Minsk/Protvino: • 2 types tested with APD and MIP’s • 10 preamps available • 100 preamps in february 2003, ~ 3 Euro/channel • design of 16 channel multilayer PC: ~ 8000 Euro needed • OPERA/Orsay/Calice ECAL: • prototype: ~10 mm2 preamp chip, OPERA type for APD and PMs • Nov./Dec. specification of modifications, Prague/Orsay activity • than submission of test production order, ca 4000 Euro • delivery May/2003 about 15 boards with 16 preamps? • Prague: • for APD’s,see Ivos talk 16.11.02, ECFA-DESY, Prague

  19. the DESY APD-preamp test: Peter Smirnov: APD: Hamamatsu S8664-55, 5x5 mm2, Ub~400V Ub Ui • Bias network: • a la H1/SPACAL, 16 channels, • adjust gain of individual channels • with MIP’s, LED? APD’s preamps 16.11.02, ECFA-DESY, Prague

  20. The MINICAL studies, 1 • 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 16.11.02, ECFA-DESY, Prague

  21. The MINICAL studies, 2 • Calibration with LED pulses • Light 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 DT and DU shift • To study: • LY (>15pe) • Uniformity (<3-4%) • Gain • Noise separation from MIP peak (>4s) • Stability (<1%) • Calibration precision with MIP’s (< 2%) • Useful rates (> 0.1Hz?) 16.11.02, ECFA-DESY, Prague

  22. The MINICAL studies, via web Study the results of up to 64 channels with MIP’s • Install in minical: • different • scintillators • fibres • photodetectors • preamps • supply voltages • trigger conditions At DESY: LED monitoring Start run with new components or new settings all 24 hours. via web: • Look for: • gain • stability • signal width • signal noise separation • calibration with MIP’s • run parameter file ITEP LPI MEPHI Prague Protvino DESY .... very similar later during prototype running in 16.11.02, ECFA-DESY, Prague

  23. Longitudinal HCAL-segmentation Calorimeter cells TDR cell structure: 3 x 3 layer cells, 5x5 cm2, 3 x 4 layer cells, 5x5 cm2, 2 x 5 layer cells, 10x10 cm2, 1 x 7 layer cells, 15x15 cm2 4 different options,with increasing absorber plate thickness with depth: 4.84, 9 layers 5.13, 8 layers 5.22, 8 layers 5.27 l, ,7 layers coil ~ 1.8 l 16.11.02, ECFA-DESY, Prague

  24. The Tile-Detector-Cassette c a b a= 6.5 cm b=1.12-1.67m c= 2.75 m • The structure (from top to bottom): • plastic air bag layer, 500 mm ? • 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 structure: 16.11.02, ECFA-DESY, Prague

  25. 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 ?) 16.11.02, ECFA-DESY, Prague

  26. 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 16.11.02, ECFA-DESY, Prague

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