Ionization chambers for the TRIUMF parity violation experiment
- and others
Transverse field ionization chambers (TRICs) have been constructed and tested for the TRIUMF parity violation experiment, which will measure the longitudinal polarization asymmetry A{sub z} in p-p elastic scattering at 230 MeV to an accuracy of {+-} 2x10{sup -8}. In order to obtain this accuracy, detector currents from ionization chambers rather than individual scattered protons will be measured. A universal curve was obtained for the TRIC response, when the normalized output was plotted versus applied voltage/pressure/{radical}beam current. Statistical fluctuations in the TRIC output are mainly due to spallation products from the entrance windows, delta rays, and space charge effects. The TRICs have been designed to minimize these effects. Fluctuations were measured by comparing the signals from two collector plates; results show that the required statistical accuracy can be obtained in 300 hours at a proton beam current of 500 nanoamps with a 40 cm LH2 target.
- OSTI ID:
- 387145
- Report Number(s):
- CONF-931044--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
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