A High Power Hydrogen Target for Parity Violation Experiments

Details A High Power Hydrogen Target for Parity Violation Experiments A High Power Hydrogen Target for Parity Violation Experiments

1996-02-14

arxiv.org/abs/nucl-ex/9602002v1

Nucl.Instrum.Meth. A378 (1996) 383-391

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 9 postscript figures

Scientific paper

10.1016/0168-9002(96)00489-5

Parity-violating electron scattering measurements on hydrogen and deuterium, such as those underway at the Bates and CEBAF laboratories, require luminosities exceeding $10^{38}$cm$^{-2}$s$^{-1}$, resulting in large beam power deposition into cryogenic liquid. Such targets must be able to absorb 500 watts or more with minimal change in target density. A 40~cm long liquid hydrogen target, designed to absorb 500~watts of beam power without boiling, has been developed for the SAMPLE experiment at Bates. In recent tests with 40~$\mu$A of incident beam, no evidence was seen for density fluctuations in the target, at a sensitivity level of better than 1\%. A summary of the target design and operational experience will be presented.

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