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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
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

new results and further plans for the tesla tile hcal1
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

new results and further plans for the tesla tile hcal2
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

systematic studies for tfs optimisation i
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

systematic studies for tfs optimisation ii
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

systematic studies for tfs optimisation iii
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

fibre fibre connection
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

more on scintillators
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

more on fibres
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

more on tile fibre couplings
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

and more
and more

10 x 10 cm2

PM

  • Very proper treatment
  • is important!!
  • Reproducibility?
  • Ageing?

16.11.02, ECFA-DESY, Prague

more on tile sizes
more on tile sizes

38 layers

require

38 different tile sizes

casting with

minimum number

of moulds!

16.11.02, ECFA-DESY, Prague

more on photodetectors
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

more on photodetectors1
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

multianode pm s
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

si pm s mephi dark rate and mip detection
Si-PM’s (MEPHI), dark rate and MIP detection

From Elena Popova

16.11.02, ECFA-DESY, Prague

apd s
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

more on preamplifiers
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

the desy apd preamp test
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

the minical studies 1
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

the minical studies 2
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

the minical studies via web
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

longitudinal hcal segmentation
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

the tile detector cassette
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

time schedule for the hcal prototype 2003 2004 i
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

time schedule for the hcal prototype 2003 2004 ii
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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