V. Korbel, DESY 16.11.02, 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
26
Embed
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.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
V. Korbel, DESY 16.11.02, 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/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
V. Korbel, DESY 16.11.02, 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, 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 ?
V. Korbel, DESY 16.11.02, 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
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 4
Light emission of different short WLS-fibresilluminated with room light
Light emission for BC-91Aillumination across fibre diameterspot of 100mm,0 = fibre center
Systematic studies for TFS optimisation, I
FPOF=WLS
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 5
Systematic studies for TFS optimisation, II
Light yield for 3 short WLS-fibresnormalised 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
V. Korbel, DESY 16.11.02, 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 sensitivityNiko Kakalis, FH Friedberg, Diploma Thesis, Prof. Klein and VK
Light emission/attenuation in WLS fibres: 10,40,90 cm, BC92,BC91A,Y11
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 7
fibre-fibre connection
WLSfibre to clear fibre:standard is gluing with optical gluenew procedure: fusing, ~ 80-120oC, heating by 1-2 windings of resistive wirefibres cut, adjusted and pushed together in glass tube of 1.10 mm inner hole diameterfew A current for a few sec.
>> connection difficult to find by eye no light loss seen at connection first results: 84% transmissionassume a large improvement potentialis still available in this process
V. Korbel, DESY 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 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
V. Korbel, DESY 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”-experimentalBCF-99-06, red sensitive
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 10
more on tile-fibre couplings
This 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
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 11
and more
Very proper treatmentis important!!•Reproducibility?•Ageing?
M= 50 100Id 600pA 1.2nAC 28pF 28pF30 samples by Jan. 2003, FOR TESTsamples will be in S8664-55 PKG.60 EURO for 1500 pcs
C
GAIN M
Id
500 V
10
100Hamamatsu S8664-55
0
50
100
150
200
250
0 50 100 150 200 250 300 350 400
bias voltage
gain
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 18
more on preamplifiers
CMS/DESYAPD’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
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 19
the DESY APD-preamp test:
Peter Smirnov:APD: Hamamatsu S8664-55, 5x5 mm2, Ub~400V
Ui
APD’s
Ub
preamps
Bias network: •a la H1/SPACAL, 16 channels,•adjust gain of individual channels with MIP’s, LED?
Hamamatsu S8664-55
0
50
100
150
200
250
0 50 100 150 200 250 300 350 400
bias voltage
ga
in
V. Korbel, DESY 16.11.02, 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 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
V. Korbel, DESY 16.11.02, ECFA-DESY, Prague 21
•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
V. Korbel, DESY 16.11.02, 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
ITEPLPIMEPHIPragueProtvinoDESY....
At DESY:
via web:
Start run withnew componentsor new settingsall 24 hours.
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
V. Korbel, DESY 16.11.02, 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 cmb=1.12-1.67mc= 2.75 m
b
c
The structure:
V. Korbel, DESY 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 ?)
V. Korbel, DESY 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