v. korbel, desy16.11.02, ecfa-desy, prague 1 new results and further plans for the tesla tile hcal...

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



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 ?



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


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


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


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


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


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


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


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


and more

Very proper treatmentis important!!•Reproducibility?•Ageing?

0

1,6

3,2

4,8

6,4

8

9,6

11,2

0

2

4

6

8 10

12

05

1015202530354045

50

55

60

65

resp

onse

to S

r90

x axis (cm) y axis (cm)

60-65

55-60

50-55

45-50

40-45

35-40

30-35

25-30

20-25

15-20

10-15

5-10

0-5

PM

10 x 10 cm2


more on tile sizesn x z N n x z N

1 5,3 5,11 780 18 8,92 8,85 3302 5,37 5,11 780 19 9,02 8,85 3303 5,44 5,11 780 20 9,12 8,85 3304 5,51 5,31 750 21 9,21 8,85 3305 5,59 5,31 750 22 10,25 10,21 2606 5,66 5,31 750 23 10,36 10,21 2607 6,14 5,9 630 24 10,47 10,21 2608 6,22 5,9 630 25 10,58 10,21 2609 6,3 5,9 630 26 10,69 10,21 260

10 6,87 6,64 520 27 12 12,07 19811 6,95 6,64 520 28 12,12 12,07 19812 7,04 6,64 520 29 12,24 12,07 19813 7,12 6,64 520 30 12,36 12,07 19814 7,81 7,58 420 31 12,48 12,07 19815 7,9 7,58 420 32 14,18 16,59 12816 7,99 7,58 420 33 14,47 16,59 11217 8,08 7,58 420 34 14,77 16,59 96

10240 35 15,19 16,59 8036 15,83 16,59 6437 15,88 16,59 4838 19 16,59 32

4170

total sum in HCAL Barrel module: 14410 tiles

38 layers require 38 different tile sizes

casting withminimum number of moulds!


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


Hamamatsu,multianode PM,44mm2pixel

Hamamatsu,APD, 55 mm2

Hamamatsu,APD-array,11 mm2 pixel

MEPHI, Si-PM, 11 mm2 pixel

Detailed investigation of available photodetectors with 55 cm2 scintillator tiles in test beamsMIP 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


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 V100-70% at 800 V100-64% at 750 V100-60% at 700 V100-70% at 650 V

--X-talk from 1 channel to allother 15 cells: 2-6%


0 5 10 15 20 25 30 35 400,0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

0,8

0,9

1,0

10-2

10-1

100

101

102

103

104

105

106

107

108

MIP Detection by one cell ( 3 Tiles + 3 SiPMs)

98% efficiency

Da

rk r

ate

, Hz

Threshold, phe

MIP

de

tect

ion

eff

icie

ncy

Si-PM’s (MEPHI), dark rate and MIP detection

From Elena Popova


APD’sHamamatsu, 3x3mm APD, S5344 ?typical performance:

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


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


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


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


•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


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


Longitudinal HCAL-segmentation

a l(cm) b l(cm) c l(cm) d l(cm)

1 2 1 2 1 2 1 2

0,65 0,65 0,65 0,65

2 2 2 2 2 2 2 2

0,65 0,65 0,65 0,65

3 2 3 2 3 2 3 21 0,65 1 0,65 1 0,65 1 0,65

4 2 4 2 4 2 4 2

0,65 0,65 0,65 0,65

5 2 5 2 5 2 5 2

0,65 0,65 0,65 0,65

6 2 6 2 6 2 6 22 0,65 2 0,65 2 0,65 2 0,65

7 2 7 2 7 2 7 2

0,65 0,65 0,65 0,65

8 2 8 2 8 2 8 2

0,65 0,65 0,65 0,65

9 2 9 2 9 2 9 23 0,65 3 0,65 3 0,65 3 0,65 23,85 1,15

10 2 10 2 10 2 10 3

0,65 0,65 0,65 0,65

11 2 11 2 11 2 11 3

0,65 0,65 0,65 0,65

12 2 12 2 12 2 12 30,65 0,65 4 0,65 4 0,65 10,95 0,56

13 2 13 2 13 2 13 44 0,65 4 0,65 0,65 0,65

14 2 14 2 14 2 14 4

0,65 0,65 0,65 0,65

15 2 15 2 15 2 15 40,65 0,65 5 0,65 0,65

16 2 16 2 16 2 16 40,65 0,65 0,65 5 0,65 18,6 0,99

17 2 17 2 17 2 17 55 0,65 5 0,65 0,65 0,65

18 2 18 2 18 2 18 50,65 0,65 6 0,65 47,7 2,30 0,65

19 2 19 2 19 4 19 5

0,65 0,65 0,65 0,65

20 2 20 2 20 4 20 50,65 0,65 0,65 6 0,65 22,6 1,23

21 2 21 2 21 4 21 66 0,65 55,65 2,68 6 0,65 55,65 2,68 0,65 0,65

22 2 22 4 22 4 22 60,65 0,65 7 0,65 18,6 0,99 0,65

23 2 23 4 23 8 23 6

0,65 0,65 0,65 0,65

24 2 24 4 24 8 24 40,65 0,65 0,65 7 0,65 24,6 1,35

25 2 25 4 25 80,65 7 0,65 18,6 0,99 0,65

26 2 27 6 26 87 0,65 0,65 8 0,65 34,6 1,94

27 2 28 6

0,65 0,65 101 101 5,2228 2 29 6

0,65 0,65

29 2 30 60,65 8 0,65 26,6 1,46 100,6 101 5,3

30 20,65

31 28 0,65 26,5 1,28 NIL rho lambdaxo

32 2 Pb 194 11,4 17,05 0,56

0,65

33 2

0,65 Fe 132 7,87 16,76 1,76

34 2

0,6535 2 PS 81,9 1,03 79,36 42,40

0,65

36 2

0,65

37 2

0,65

38 29 0,65 18,55 0,89

Calorimeter cells

4 different options,withincreasing absorberplate thicknesswith depth:4.84, 9 layers5.13, 8 layers5.22, 8 layers5.27,7 layers

coil ~ 1.8

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


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:


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 ?)


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

v. korbel, desy16.11.02, ecfa-desy, prague 1 new results and further plans for the tesla tile hcal...

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