1. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 1 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/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

2. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 2 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, 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 What did we establish so far ?

3. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 3 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

4. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 4 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 Systematic studies for TFS optimisation, I FPOF=WLS

5. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 5 Systematic studies for TFS optimisation, II Light yield for 3 short WLS-fibres normalised to source photo-current at = 500 nm >>>only scintillation light with  < 470 nm is useful 40 cm Light source LE-peak of: BC-408: 425 nm, BC-404: 408 nm

6. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 6 Systematic studies for TFS optimisation, III 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 Light emission/attenuation in WLS fibres: 10,40,90 cm, BC92,BC91A,Y11

7. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 7 fibre-fibre connection WLSfibre to clear fibre: standard is gluing with optical glue new procedure: fusing, ~ 80-120 o C, 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

8. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 8 more on scintillators Best scintillator: is BC-408 on base of Poly-Vinyl-Toluene >>> 25 pe/tile(5x5 cm 2 ) measured in Hamamatsu MA-PM >>> about 600 photons on photocathode but BC-408 is rather expensive, need 6950 m 2, ~ 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

9. V. Korbel, DESY16.11.02, 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

10. V. Korbel, DESY16.11.02, 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. TFS wrapped with 3M-Superreflector a b c

11. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 11 and more Very proper treatment is important!! Reproducibility? Ageing? PM 10 x 10 cm 2

12. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 12 more on tile sizes 38 layers require 38 different tile sizes casting with minimum number of moulds!

13. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 13 Detailed investigation of available photodetectors: APD’s: gain 300-500 CMS-type, 5x5mm 2 S5344, 3x3mm 2, S5355, 5x5mm 2 S8664-55, 5x5mm 2 S8550, 32 pixels of 1.6x1.6mm 2 Si-PM’s: gain 10 5 MEPHI, 1x1mm 2, MA-PM’s: gain 10 6 H8711-10, 16 pixels of 4x4mm 2 R5900-00M16, 16 pixels of 4x4mm 2 800-1200 Photodetectors needed (APD or MA-PM’s) 3200-4800 Si-PM’s of 1x1mm 2 needed alternatively More on photodetectors

14. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 14 Hamamatsu,multianode PM,4  4mm 2 pixel Hamamatsu,APD, 5  5 mm 2 Hamamatsu,APD-array,1  1 mm 2 pixel MEPHI, Si-PM, 1  1 mm 2 pixel Detailed investigation of available photodetectors with 5  5 cm 2 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 More on photodetectors

15. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 15 Multianode-PM’s At DESY: Performance studies: H8711-10, 16 pixels of 4x4mm 2 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. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 16 Si-PM’s (MEPHI), dark rate and MIP detection From Elena Popova

17. V. Korbel, DESY16.11.02, 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 C GAIN M Id 500 V 10 100

18. V. Korbel, DESY16.11.02, 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 mm 2 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

19. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 19 the DESY APD-preamp test: Peter Smirnov: APD: Hamamatsu S8664-55, 5x5 mm 2, U b ~400V UiUi APD’s UbUb preamps Bias network: a la H1/SPACAL, 16 channels, adjust gain of individual channels with MIP’s, LED?

20. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 20 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 cm 2, 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

21. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 21 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  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

22. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 22 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 ITEP LPI MEPHI Prague Protvino DESY.... At DESY: via web: Start run with new components or new settings all 24 hours. very similar later during prototype running in

23. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 23 Longitudinal HCAL-segmentation Calorimeter cells 4 different options,with increasing absorber plate thickness with depth: 4.84, 9 layers 5.13, 8 layers 5.22, 8 layers 5.27 ,7 layers coil ~ 1.8 TDR cell structure: 3 x 3 layer cells, 5x5 cm 2, 3 x 4 layer cells, 5x5 cm 2, 2 x 5 layer cells, 10x10 cm 2, 1 x 7 layer cells, 15x15 cm 2

24. V. Korbel, DESY16.11.02, ECFA-DESY, Prague 24 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 cm b=1.12-1.67m c= 2.75 m b c The structure:

25. V. Korbel, DESY16.11.02, 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 m 2, 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 ?)

26. V. Korbel, DESY16.11.02, 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