CalorimetryNICADD.next2yrs

1
Calorimetry_at_NICADD.next2yrs

• Vishnu V. Zutshi
• For the NICADD team

2
Introduction

• The goal
• Where we are
• The road ahead
• Sincere thanks to NICADD personnel for providing
  advice and input for this
• My personal opinions to start the discussions

3
The Goal

• Take a leadership role in calorimeter RD for the
  Linear Collider Detector
• Focus on scintillator-based (semi)digital hadron
  calorimeter
• Develop simulations and algorithms to fully
  exploit the power of the proposed calorimeters
  (Dhimans talk)

4
Linear Collider Detector
ECAL and HCAL inside coil
5
Single Particle Resolutions
6
Where We Are

• Light yield
• Tile-fiber system optimization
• Layer stack
• Photo-detectors

7
MIP Light Yield
9.4 cm2 cells with sigma grooves, 0.94 mm fiber,
readout w/ 16-channel PMT. Avg. MIP LY 11
p.e. Very sensitive function of tile-fiber
specifics.
8
Tile-Fiber Studies
9
In Progress
10
Light Yield Dispersion
Within 15 desired
11
Layer Stack
12
Reading out the Layer Stack
4 layers being read out
13
Layer Stack Next Steps

• Understand the response of the 4 layers currently
  being readout
• Readout all 84 channels with pmts
• Gradually replace some layers with solid-state
  photo-detectors like Si-PMs, APD or MRS
• May need to replace the cells

14
Avalanche Photo Diodes
32 channel Hamamatsu matrix. 80 QE, gains in the
low 100s.
15
APD Gain Studies
16
APD Next Steps

• Wrap up gain measurements (both APDs)
• Fabricate APD box
• Cross calibrate with PMT
• Alternate test-stand
• Try to obtain mip signal for a single channel
• Multi-channel readout
• Study temperature dependence

17
Si-PMs
1K pixels on 1mm2
18
Preliminary Results with Si-PMs
MRS devices expected end of the month
19
Manpower
LC Muon MUCOOL D0

• Tile-Fiber System Sasha, Peter (leaving soon)
• Layer Stack Kurt, Donna
• APD Dimitri
• Si-PM Victor
• Electronics Manuel, Victor
• Electrical and Mechanical Shops

Extruder
Doing coursework
Intends to teach
20
Funding Requests
10K planning grant awarded
21
The Road Ahead

• Test Beam
• Collaboration
• Tail-Catcher
• Electronics
• Additional funding
• Papers

22
Test Beam

• Fully test the detection and readout chains
• Gain experience with
• Detailed verification of GEANT4
• Testing Eflow algorithms
• Low to moderate E pions (1-20 GeV)
• Place Fermi? Protvino? ?
• 1m x 1m x 1m prototype needed

23
Collaboration with DESY?

• The other scintillator option
• 1m3 prototype late 04 to early 05
• Should we seek partnership with them?
• In my opinion we do not have much choice if we
  want to go beyond the layer stack
• the lack of a technology alternative
• cost of fully instrumented 1m3 prototype

24
Projected Funding Profile
25
Testbeam Layout
26
Test Beam Simulation
s/E measured w.r.t. full 9cm2 grid
27
Tail-Catcher
Overlaps muon RD

• Also functions as a muon system
• 5 of the tracks deposit energy outside the
  calorimeters
• Prob./event gt 20GeV (in tail-catcher)4
• For the test-beam however, it is an exclusive
  piece of apparatus
• Do we want to build this and how?

28
Tail-Catcher for the Testbeam

• 2-3 l thick, 1.5 x 1.5 m2
• Iron/Steel as absorber
• Extruded strips (X-Y ?)
• 4-5 layers
• PMT or Si-PM readout
• Do we want to make it such that it also serves as
  a muon-prototype?

10 cm thick Fe
WLS
5mm thick scint.?
29
Electronics

• Development of semi-digital readout electronics
• Must smoothly interface into the CALICE test beam
  DAQ

30
A Possible Course of Action

• Take part in CALICE testbeam
• Instrument 15-20 layers of 3x3 grid (1500-2000
  cells 12-15K)
• Take responsibility for the tail-catcher (major
  infrastructure cost is iron 0-10K 2-5K for
  photodetectors labor transportation ? ask
  DESY or Fermilab)
• Design and fabricate semi-digital electronics

31
DOE Funding?

• Possibility exists of getting DOE support for LC
  related calorimeter RD
• Cannot ask money for the same things eventhough
  the money being earmarked for them is not enough
• Possible projects
• Instrumentation and/or electronics for n
  layers
• tail-catcher

32
Papers

• IEEE Transactions (November)
• mostly on tile-fiber system optimization
  some motivation from simulation
• NIM (early 2004)
• hardware and simulation paper establishing
  the feasibility of a scintillator-based
  (semi)digital hcal
• Test-beam related articles (late 2004)