The TileHCAL, studies and time plans, V' Korbel, DESY, 30m

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The Tile-HCAL, studies and time plans,V. Korbel,
DESY, 30m

• The last meetings since ECFA-DESY workshop in
  Prague (Nov. 2002)
• actual status of RD
• scintillators
• WLS-fibres, clear fibres, fibre coupling
• optimisation of tile-fibre system (TFS)
• photodetectors
• preamps
• measurements with the minical
• readout and DAQ
• cosmics,
• noise and pedestals
• LED-calibration
• plans for e-beam test at DESY (summer 2003)
• status of preparations for the 1m3 prototype for
  E-flow beam tests
• photodetectors
• preamps
• VFE RO boards

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The last Tile-HCAL meetings

• Since the Prague ECFA-DESY workshop
• main meetings 4.12.2002, 20.1.2003,
  4.3.2003
• LAL-Orsay, preamps for APDs, dela Taille,
  Cvach,... Dec. 2002
• CERN, VFE for APDs with DUBNA, I. Golutvin, I.
  Tiapkin, F. Sefkow, Dec. 2002
• DUBNA, VFE, I. Golutvin, I. Tiapkin, Y. Gilitski,
  Minsk people,.... Febr. 2003
• ITEP and MEPHI, Moscow, B. Dolgoshein, V.
  Rusinov,..... Febr. 2003
• LAL-Orsay, VFE for APDs, dela Taille, I. Tiapkin,
  F. Sefkow,... Febr. 2003
• ????
• future main meetings 6.5.2003, 17.6.2003 ??? To
  be fixed these days

Documentation 1. tasks, institutes, people,
time plans, meetings, talks and minutes in
Web gtgtgthttp//www.desy.de/korbel/see/tilehacal/.
... 2. detailed Tile-HCAL RD report, Oct. 2002,
available The Tile-HCAL Calorimeter
for the TESLA Detector, a Status Report
on the RD-Studies 3. new web-page with
better guidance is prepared, open next week!
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Presentations for the Tile-HCAL on this workshop

• CALICE collaboration meeting (Monday,31.3.03,NIKHE
  F)
• V. Korbel, Introduction to CALICE Tile-HCAL
  meeting
• Status of the RD, 15
• M. Danilov for ITEP, RD in Russia, 20
• B. Dolgoshein for MEPHI,
• News from the Si-PMs as
  Photodetetctors for the Tile-HCAL, 20
• S. Nemecek for Prague,
• APDs for the HCAL, gain
  stability
• V. Korbel for DESY, LPI
• Tests with the minical, plans
  for prototype, time scale
• DAQ and Trigger meeting
• V. Korbel, DAQ concepts for the minical and
  Tile-HCAL prototype, 10
• P. Daucey, CALICE beam test DAQ
• Calorimeter Session, Hadronic Calorimeter
• V. Korbel, The Tile-HCAL, studies and time plans
• V. Morgunov for DESY, ITEP, Prototype Tile-HCAL
  Simulation with
• Si-PMs as Photodetectors
• P. Dauncey, DAQ for the CALICE beam test

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The plastic scintillators for the tiles

• The different scintillators studied
• PVT -BC-408, BC-404,.....
• PS
• SCSN-81, Kuraray
• new RD scintillators from Kuraray
• ITEP/Vladimir BASF-143, others
• Protvino/LPI SC-306M, SC-307.....
• Charkov
• The PS scintillators based on PS
• show 0.5..0.65 LY of PVT
• but 5 x cheaper
• possibility to cast them in tiles
• (with grooves)
• gtgtgt made studies on
• LY and uniformity, ok?
• gtgtgt decision to select producer

M.Danilov,CALICE main recent measurements in ITEP
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Details of TFS Optimisation Studies
Centre/straight WLS-fibre
Diagonal/bent WLS-fibre
No stress on fibre, fibre refl. tile
reflector

more stress on fibre, fibre refl. tile
reflector
L7.85cm
L7,85cm
L5cm
clear RO fibre to couple 1-3.5m in
detector, light attenuation lt18

• Double looped fibre
• strong fibre bend,
• most stress on fibre,
• probably ageing damages,
• fibre end fibre reflector
• inside tile gtgtgt
• special reflective coating
• needed ?

• 1.1 mm hole in center
• drilled and polished?
• could it be made during tile moulding?

L31,4cm
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The WLS-fibres
1 mm diameter, double clad, BC-91A BC-92 BC-Daygl
o, red range extended Kuraray, Y-11(100-500ppm)
WLS shifting component polishing of fibre
end fibre end reflector attenuation
length conversion efficiency stability against
bends, loops (2.4 mm radius) ageing agains bend
stress, in radiation field gtgtgtgt Y-11(300) for
short fibres Y-11(500) for long
fibres material available for all minical channels
University Friedberg/Giessen
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The coupling of WLS-fibres to scintillator
, similar to BC-408, 404
Have selected Kuraray Y11(300)
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TFS LY measurements at ITEP
M.Danilov,CALICE main
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The actual achieved LY for the TFS
Scintillator BC-408,
, Kuraray, WLS-fibre
3M-Super Radiant Reflector
Light yield/tile/MA-PM

• 22/-1.5 pe (BC-408, Aug. 2002)
• gtgt 26 (new results from ITEP)
• both Russian scintillators
• have 2/3 of BC-408 LY
• 20 more LY can be expected
• by improving polishing
• of WLF-fibre end,
• no gluing needed anymore

All together
100 reflectivity at fibre end
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Light attenuation measurement in RO-fibres
WLS-fibre, Kuraray
10,20,50 and100 cm
clear-fibres, Bicron and Kuraray

• attenuation in clear RO-fibres minimal
• BC-98 0,65 db/m 40 for 5m fibre
• no damage observed for bent fibres
• (d5 cm)
• no ageing during 1 day observed
• gtgtgt Y11(300), on tile BC-98 RO-fibre

(ITEP)
Photocathode sensitivity of APD
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WLS fibre-clear fibre connection

• WLS-fibre gtgtclear fibre
• standard is gluing with optical glue
• better procedure
• thermo-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.
• gtgt connection difficult to find by eye
• no light loss seen at connection
• first results 84 transmission
• improvement potential
• still available in the fusing procedure
• Well established procedure at FNAL
• for CDF calorimeter, 90 transmission
• gtgtproduction parameters
• can be optimised

Pressure, temperature, time guide tube diameter ?
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Photodetectors
The remaining candidate photodetectors APDs
S8664-55spl, 3x3mm2, S8550, 32 pixels of
1.6x1.6mm2 at test in
Prague Si-PMs (MEPhI) gain 2106
photocathode eff. 15-20 sizes 1x1mm2,
576 and 1000 pixels/mm2 -800-1200
Photodetectors needed (APDs) with 3-7 tiles
combined to calo cells or -3200-4800 Si-PMs of
1x1mm2 needed alternatively -decision to use both
detectors in prototype
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APDs
Hamamatsu, 3x3mm APD, S8664-55spl package is same
as S8664-55 (5x5 mm APD)'s with
resin coating. Delivery time takes 1.5 months for
30 pcs typical performance gain 50 100
gt1000 possible Id 600pA 1.2nA C 28pF
28pF have 6 APDs for tests 170 Euro per piece,
for 30 122 Euro per piece, for 300 60 Euro per
piece, for 1500 25 Euro ? for gt 100 000 APDs?
Future plan (Hamamatsu) APD Array try to
make low capacity type, proceed with "3 x 3
mm, 4 x 4 ch APD-array". target characteristic is
as follows. C 15 pF Variation of
gain /- 20 to 30
GAIN M
C
100
Id
10
500 V
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SiPMs, Silicon Photomultiplier
RD at MEPHI (Moscow), B. Dolgoshein, together
with PULSAR (Russ. Industry)

• Some features
• Sensitive size 1x1mm2 on 1.5x1.5 mm2
• Gain 2?106 at Ubias 50V
• Recovery time 100 ns/pixel
• Nuclear counter effect negligible
• (due to Geiger mode operation)
• Number of pixels 576, now 1000/mm2
• Dynamic range gt 200

For further details see Advanced study of
SiPM http//www.slac.stanford.edu/pubs/icfa/fall0
1.html
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Performance of SiPMs with 1 scint.Tile
minical
4-8 pe 576 px 53-55V
15 pe 1000 px Si-PM on tile
10 pe, 576 px 54V
DESY e-test beamwith various Si-PMs (MEPHI)
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Si-PMs, dark rate and MIP detection
Sum of 3 tiles,e-beam test DESY
576pix/mm2 From Elena Popova, MEPhI
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Minical array
Stack and Tile structure

• Assembled with up to
• 27 scintillator layers,
• of 9 tiles each,
• 5x5X0.5 cm3
• 243 scintillator tiles
• or
• 81 cells of 3 tiles
• read out by
• 50 cm WLS fibres to
• photo-detectors
• APDs 3 tiles/APD
• MA-PMs 16fold, 3 tiles/pixel
• Si-PMs 1 tile/Si-PM
• also1x32 M-APD array (Pra

• Aim of this device is
• cosmics, study of
• LY
• uniformity of response
• calibration with MIPs
• stability of MIP signals
• different photodetectors
• long term ageing
• LED monitoring
• stability
• dynamic range
• e-beam, study of
• energy resolution
• constant term

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Minical, pictures
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Minical, pictures
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Where are we?

• Status now, for minical tests
• WLS-fibres ordered and delivered, 500m(Y11-300)
  and 100m(Y11-500)
• 3M super-reflector foil available
• minical now modified by Prague group
• 9 mm gaps, larger housing,
  windows for feed-through, light tight,
• easier access to interior
• 6 new Hamamatsu APDs (3x3 mm2, 190 Euro/piece)
  now at DESY
• to be inserted in minical for MIP tests, yield
  next 3 weeks ?
• Si-PM production/delivery schedule (see Boris
  talk)
• next 30 available, than 100 up to June,
  1000 pixels/mm2
• TFS geometry, reduce variety soon, up to end
  April
• design/build cassettes, for 9 tiles, 9 mm tick,
  27 pieces for July tests
• preamps to design/order gtgt LAL Orsay 7.4.03,
  delivery 30.6.03
• RD for Minsk/Gilitski, Prague, DESY/Smirnov
  types goes on
• APDs and Si-PMs to order gtgt 30 APDs and 100
  Si-PMs (with 1000pixels)
• HV distribution to design/order/build
• 380-420V, APD, 30 channels
• and 55-68 V, Si-PM, 100 channels

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minical-tasks, TFS production details

• The TFS for the minical
• --81 tiles with Si-PMs, short WLS-fibres, SI-PM
  inserted, from Vladimir/ITEP
• --81 tiles from Protvino, with cylindrical
  holes??,
• cast in moulds, together with the tiles or
  drilled, to insert the WLS-fibres
• --81 tiles from BC-408, cut and polished at DESY,
  with
• a) WLS-fibres in cylindrical, drilled
  central holes, 50 cm more fibre to APDs
• b) WLS fibres in curved diagonal grooves,
  also 50cm to APDs
• Hope to have a technology to replace the
  WLS-fibre
• outside the tiles by fused clear fibres,
  who does it?
• Can ITEP prepare also the 81 Protvino tiles?
• gtgtI.e. make grooves or holes, insert fibres,
  wrap tiles, test in black box?
• A special gt5 cm long drill of 1.1 mm diameter is
  in preparation at DESY.
• We need to group tiles with equal (/-5) LY,
• 3 tiles of same response to one APD. Thus LY
  of all 81 TFS to be measured
• with a source. To do at DESY with help of
  Protvino/LPI people.
• Our Time scheme
• Production of tiles in April/mid May
• Machining/Wrapping in May/ mid June
• Tests and selection in June/mid July

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Support frames for TFS
For APDs
For SI-PMs
MEPhI, ITEP
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Direct TFS readout with SiPM
in minical at DESY
M.Danilov,CALICE main
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Shower containment in minical, DESY e-beam
1 section, 9 layers, 81 cells
MIP peak used for calibration
Shower leakage to correct with the middle
section of minical
Studies by V. Andreev gtgtgt
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Energy resolution in minical, DESY e-beam

• s/Ea/sqrt(E) () c
• Aim is to study
• the effects contributing
• to the constant term
• LY fluctuations within tiles
• lat. non-uniformity of response
• MIP calibration precision
• stabilty of calibration
• noise
• dead gaps between tiles
• leakage

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Energy resolution in minical, Si-PM, 576 pixels
Saturation curve number of fired pixels
vs number of photons x photo-conversion
efficiency s/Ea/sqrt(E) () c
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Calibrating the minical cells
BC-408 scintillator single tile, diagonal bend
groove, cosmic m-peak, 60 cm WLS fibre
RO MA-PM 23,1-26,2 pe

• Noise, randoms
• cosmics
• LED-pulses

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Calibrating minical cells, studying LY
BC-408 scintillator single tile, diagonal bend
groove, cosmic m-peak, 60 cm WLS fibre RO to
MA-PM 23,1-26,2 pe
Random and pedestal subtracted cosmic m-peak
spectra of some PS-scintillators from
Protvino/LPI 9-13.3 pe
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Remote web access to the measurements
Study the results of up to 64 channels with MIPs

• Install in minical
• different
• scintillators
• fibres
• photodetectors
• pre-amps
• supply voltages
• trigger conditions

At DESY
LED monitoring
Start run with new components or new settings all
24 hours.

• Look for
• gain
• stability
• signal width
• signal noise separation
• calibration with MIPs
• run parameter file

• via web
• sw-tools
• F. Krivan
• V. Dodolov
• A.Terkulov
• S. Karakash

ITEP LPI MEPHI Prague Protvino DESY ....
very similar situation later during prototype
running in beam test at other laboratories
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HCAL prototype for E-flow studies

• Required volume 1 m3
• 800-1200 calorimeter cells
• Fe-structure can accept
• analogue
• or digital HCAL??

10 GeV pions
100 cm
Leakage detector needed!
100 GeV pions
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The Prototype stack

• Design/Construction Studies
• TDR
• LC-notes
• K. Gadow, VK
• DESY, Jan. 2003
• Need now to come to decisions
• how to build?
• Steel, ss?
• 2 half modules (magn.field?)
• Where?

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more on tile sizes and total numbers
38 layers require 5000 tiles with 38 different
tile sizes casting with minimum number of
moulds! Need to fix tile sizes soon!
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Prototype channels
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The fraction of prototype cells fired
Simulation studies for single pions beam
energies 10, 40, 100 GeV RO threshold cuts 0,
0.25, 0.5 MIP standard granularity 5x5cm2,
3 cells deep(3/9) 6x6cm2, 3 cells deep(4/12)
8x8cm2, 2 cells deep(2/10) 12x12cm2, 1 cell
deep (1/7) 969 cells in total
By V. Andreev
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Energy sharing between ECAL and HCAL-PT
The following studies from V. Andreev ECAL and
TC have effect on energy resolution 45-55 of
events depose more than 2 GeV in ECAL
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Prototype TC for energy resolution
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The contribution of the TC to the energy
measurement
E(ECAL) E(HCAL) lt--gt E(TC)/(E(ECAL) E(HCAL))
Epion5,10,20,30,50 GeV
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The VFE-ROB-scheme, APDs
Online/Offline Gain/HV monitoring?
DAC-signals
PIN diode for LED monitoring
LED signals
beam
cosmic
HV, 380-420V dV/V10-4
Trigger/ RO clock
DAC
Charge injection
pedestals
Array of single APDs or matrices
pulse shapers
Sample hold
Multi plexer (analog)
charge sensitive preamps
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Time Planing, 4.3.2003, I

• 1. Pre-selection of appropriate photodetectors
• available APDs(6) and Si-PMs(10)
• ordering larger quantities for more tests in
  minical (March).
• Need 30 APDs and 162 Si-PMs in total, Si-PMs
  (1000 pixels!)
• 2. studies and development of integrated
  preamplifier/shaper circuits,
• and MEPhI Si-PM with FE preamps.up to end
  April.
• Operation in Minical.
• 3. For minical decide on the optimal APD-preamp
  type, end March
• ---study Minsk and Prague preamps with APDs
  in minical,
• --- important get noise contribution to
  MIP-peak (noise vs MIP efficiency)
• ---order/loan 2 prototype CALICE-ECAL PCI
  preamp boards
• (which should later integrate the
  photodetector connections)
• 4. Concept/design final preamp prototype boards
  for
• the 1000 channel test prototype, ....all and
  DUBNA?, (April)
• 5. design prototype boards for all APD and Si-PM
  channels, DUBNA?,(May)
• 6. Up to May to decide, which photodetectors in
  which quantity to use
• 1000 APDs or 5000 Si-PMs,
• or both types in relevant quantities e.g.
  200/2500
• 7. order of all photodetectors for the Tile-HCAL
  prototype, June

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Time Planing,II
9. Need Russian scintillators for tests in
minical, (20 each, March) 10. ordering Bicron
BC-408 for the larger tile sizes, 8 m2, up to
Summer 11. define optimal cell and tile sizes,
from software and hardware studies, decision
up to end of April 12. Prepare 300 tile minical
test at DESY, (100/100/100) May 13. design of the
prototype stack, April/May 14. a detailed
tile-plate assembly concept has to be defined,
July 15. Minical test at DESY, with final
photodetector types, July-September 16. building
of stack steel absorber structure, in ITEP or
Prague? gtAugust 17. casting/machining of 3700
tiles up to September, (in factory ? or
machining at DESY, or elsewhere?) 18. assembly of
the TFS in tile plates (detector cassettes),
November 19. TFS connection with photodet. and
preamps, start November-December 20. RO via CAMAC
as long as British DAQ not available, end
2003 21. winter 2003/2004 operation studies with
LED gain monitoring, and calibration
studies with cosmic muons, with increasing
number of calorimeter cells as assembled.
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Outlook

• 1. Enough LY from TFS (200 photons at
  photodetector)
• 2. APDs and SI-PMs are the photodetectors which
  do the task
• 3. Preamplifiers with low noise are essential
  (MIP-noise separation,calibration)
• 4. Minical test to establish calibration
  precision in summer
• 5. Now design of prototype boards for APD and
  Si-PMs, DUBNA
• 6. Photodetectors, large quantity to order in
  summer
• 1000 APDs or
• 5000 Si-PMs or
• both types in relevant quantities e.g.
  250/3500
• 7. Prototype stack (1m3) will be build in summer
• 8. Assembly of PT-stack with TFS starts in Jan.
  2004
• 9. Spring 2004 is used to set up and calibrate
  all channels with cosmics.

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