Quartz Plate Calorimeter Prototype Hardware

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Quartz Plate Calorimeter Prototype Hardware
Preliminary Test Beam Data

• Anthony Moeller
• The University of Iowa

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Introduction

• While working on the HE Upgrade (Quartz Plate)
  RD we started to plan a Quartz Plate
  Calorimeter Prototype.
• We constructed and tested six layers of the
  prototype at Fermilab M-Test area (Feb. 2006).
• We constructed and tested twenty layers of the
  prototype at Fermilab M-Test area (Sept. 2006).
• The full quartz plate calorimeter prototype will
  be tested for the first time this November at
  CERN.

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The Fiber Geometry

• RD results and the initial model shaped the
  prototype.
• The final design
• 20cm x 20cm, 20 layers, 70 mm iron,
• 5 mm quartz
• Should be portable for tests at CERN, Fermilab,
• and Iowa.
• We used the bar geometry on the prototype.
• The signal is read by Hamamatsu R7525 PMTs.
• The fibers are 1mm diameter Bicron wavelength
• shifting fibers. They absorb photons down
• to 280 nm, emit 435 nm.
• The fibers go 20 cm out of the quartz.

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Plate Frames
Fibers

• The quartz plates are put into an aluminum
  frame.
• All quartz plates with fibers are wrapped with
• Tyvek and black tape.
• Then they are put into a frame, and
• wrapped again to make them light-tight.

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The Rail System

• All quartz plates and absorbers are on a rail
  system.
• The frames carry the PMTs.
• We constructed the first 6 layers of the
  prototype, with 3 Quartz Silica plates from
• Polymicro, and 3 UVT plates prepared in the Iowa
  machine shop.

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Test Beam _at_ Fermilab M-Test

• In February 06, we took beam at the Fermilab
  M-Test Area for a week.
• We had 120 GeV and 66 GeV positive beams. The 120
  GeV beam was mostly protons, but the 66 GeV
  contains pions and kaons.
• Although we have only 6 layers, we recorded data
  at different depths (up to 70 cm of iron).
• We developed our own DAQ with NIM, CAMAC and
  LabView.

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Test Beam _at_ Fermilab M-Test

• With a limited number of layers we observed a
  shower profile at 120 GeV.
• The 66 GeV has very low statistics.
• We compared the quartz plates with the original
  HE scintillators at different shower depths.
• At the CERN Test Beam, we will have at least 10
  layers of HE scintillators.

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Changed Plate Frames

• The position from which fibers exit the frame is
  no longer centered.
• This allows the plates to be tested with less
  iron between them.
• 1 cm iron plates will be available for use at
  CERN for electron beams.

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All 20 Layers and the Table

• 20 quartz plates, one at each layer.
• 10 HE scintillator plates, one every other layer.
• 5 cm iron absorber between layers.
• We constructed a table to support the entire rail
  system containing the calorimeter prototype.

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Amplifiers

• We have built 3 ten channel amplifiers at Iowa.
• Ten Channel Amplifiers
• Gain 30 dB (32 times)
• Rise Time lt 2 nsec
• Fall Time lt 2 nsec
• Noise Figure 3 dB ( 10uV)
• Bandwidth 500 MHz
• Input SWR 21 (0 200 MHz)
• Output SWR lt 21 (0 500 MHz)
• Maximum Output 2 volt peak
• Isolation gt 80 dB (0 500 MHz) between any two
  channels
• We have not used the amplifiers yet.

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DAQ Improvement Needed

• The DAQ we developed with NIM, CAMAC and LabView
  has two primary deficiencies.
• It is too slow for 30 channels.
• It doesnt record enough information.
• It only records the sum of the hits in each bin
  of each ADC channel.
• The DAQ currently does not record event by event
  data.
• A new DAQ using VME is currently in development
  to solve these issues.
• The results that follow are very preliminary, and
  should be improved with more statistics and by
  using event by event data.

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Sept 06 Test Beam _at_ Fermilab M-Test
Preliminary
Preliminary
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Sep 06 Test Beam _at_ Fermilab M-Test
Preliminary
Preliminary
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CERN Test Beam

• At CERN we will have1cm absorber plates.
• This will allow us to work with a variety of
  different depths.
• Will be able to use smaller depths which will be
  useful for electron runs.
• We will be using the HCAL DAQ at CERN, this
  should eliminate many of our problems stemming
  from an inefficient DAQ.

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Future Test Beams at Fermilab

• The new VME DAQ will be ready. We will collect
  event by event data, and we anticipate a higher
  rate of data collection.
• M-Test is currently undergoing a renovation that
  should allow us to have a larger variety of
  energies.
• We will have beam cerenkov detectors in the
  upstream for particle identification.