T-1018 UCLA Spacordion Tungsten Powder Calorimeter Page: 7 of 19
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MOU for Spacordion Tungsten Powder Calorimeter
2.3 EXPERIMENTAL CONDITIONS
2.3.1 AREA INFRASTRUCTURE
The apparatus is table-size, measuring about 20x20x50cm and weighs approximately 80 kg. It
will be placed on facility motion table #1 which exceeds the requirements of a remote controlled
XY staging platform, about 30x50 cm and able to move +/-10 cm in each direction with 1 mm
reproducibility, and able to support a load of approximately 100 kg.
A single 19" rack of electronics plus a PC will operate inside the enclosure within 3 meters of the
apparatus. The experimenters will control data-taking from another PC in the control room
through a single Ethernet connection.
The experiment would make use of the FTBF Cerenkov detector to tag electrons, and one
MWPC station for tracking.
2.3.2 ELECTRONICS NEEDS
CAMAC crate (experimenter's controller)
Lecroy 1440 with 32 channels of negative HV up to -2.5 kV, see Appendix II for summary of
PREP equipment pool needs.
If wire chamber information is available for beam particles, it may be possible to increase the
efficiency of data-taking by incorporating this data stream into the DAQ system.
2.3.3 DESCRIPTION OF TESTS
PMT voltage adjustment and signal timing will be mostly accomplished prior to test beam using
cosmic rays. The absolute calibration of all channels will be determined using single
The tests will begin by centering a beam of energy E-10 GeV on a reference tower. After
checking timing and dynamic range, the gain of all 16 towers will be equalized. As the array is
-4 times the size of the beam, this will require -20 short runs to cross-calibrate overlapping
groups of towers.
Once all towers gains are equalized, the experimenters will re-center the array on the beam and
take a series of long runs at beam energies from 1-32 GeV. Another energy scan will be made
after rotating the device by 2 degrees. These tests will be repeated for the 3 other prototype
designs. Several short accesses may be required between runs on each type of prototype.
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Trentalange, Stephen; Tsai, Oleg; Igo, George; Huang, Huan; Pan, Yu Xi; Dunkelberger, Jay et al. T-1018 UCLA Spacordion Tungsten Powder Calorimeter, report, November 16, 2011; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc847035/m1/7/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.