Scintillator HCal

1
Scintillator HCal

• Vishnu V. Zutshi
• For
• NICADD/NIU

2
Tile-Fiber Optimization

• Exhaustive study of material, shape, size,
  grooving, thickness, surface treatment etc.
  finished.
• Results summarized in 2 publications
• TNS-Vol51-No.4 (2004), J.
  Phys.G30N1(2004)
• Would algorithms prefer any particular cell shape
  (e.g. square vs hexagonal)

3
Photodetectors

• Propose to use on-board solid-state
  photodetectors
• Extensive experience with Si-PM and MRS.
• Results summarized in 2 papers
• Investigation of a solid-state
  photodetector submitted to NIM A
• Effect of a strong B-field on MRS in
  preparation
• Working with the vendors to refine some design
  aspects of these devices based on our experience

4
Test Beam Prototype

• Based on the hardware and software studies of NIU
  and our European colleagues.
• technology demonstration, shower MC
  validation,digital-analog,algo development

38 layers, 1m x 1m active area, 3x3, 6x6 and
12x12 cm2 cells
5
Support so far.

• DoE Advanced Detector Research grant, 2002
• UCLC preparation grant, 2003.
• DoE/NSF, 2004

6
The RD needs to continue

• It is already clear that some of design elements
  of the prototype not optimized for the full
  detector.
• The 2-3 yr test program being planned for the LC
  test beam implies that incremental modifications
  can be made and tested.
• Will be crucial for the demonstration of the full
  technical viability of the device.

7
Test Beam Operation

• Since the LC test beam will occur at Fermilab we
  will have major role in commissioning and
  maintenance of the scintillator-hcal.
• Manpower will also be needed for processing,
  calibration and analysis of the test beam data.

8
Electronics

• Further integration of the readout
• At the moment the SiPM signals are transported by
  co-axial cables to the outside world where they
  are digitized
• Intend to design and fabricate electronics
  (amplifier/digitizer/temp. monitor etc) that sits
  inside the detector
• Still keep layers down to 6.5 mm
• Plan to test a few layers of the prototype with
  the new electronics in test beam

9
Calibration

• Will develop alternative calibration schemes that
  can be tested in the test beam.
• The prototype calibration system is LED based
  which in its current form may not be practical
  for the full detector
• RD will focus on developing schemes using
  sources (wires? droplets?) and investigate the
  direct illumination of tiles with the LEDs.