Quartz Plate Calorimeter Prototype Hardware & Preliminary Test Beam Data Anthony Moeller The University of Iowa

Introduction While working on the “HE Upgrade (Quartz Plate) R&D” 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.

The Fiber Geometry R&D 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.

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.

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.

Test 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.

Test 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.

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.

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.

Amplifiers We have built 3 ten channel amplifiers at Iowa. Ten Channel Amplifiers: –Gain: 30 dB (32 times) –Rise Time: < 2 nsec –Fall Time: < 2 nsec –Noise Figure: ~ 3 dB (~ 10uV) –Bandwidth: 500 MHz –Input SWR: 2:1 (0 – 200 MHz) –Output SWR: < 2:1 (0 – 500 MHz) –Maximum Output: 2 volt peak –Isolation: > 80 dB (0 – 500 MHz) between any two channels We have not used the amplifiers yet.

DAQ Improvement Needed The DAQ we developed with NIM, CAMAC and LabView has two primary deficiencies. –It is too slow for 30 channels. –It doesn’t 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.

Sept 06 Test Fermilab M-Test

Sep 06 Test Fermilab M-Test

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.

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.