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DOE OSTI · 1059480

Q{sub weak} target performance

Smith, Gregory R.
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Abstract

The Q{sub weak} Experiment at Jefferson Laboratory aims to measure the parity violating ep scattering asymmetry at low Q2 to a statistical precision of only 5 ppb. Such precision presents many challenges for the liquid-hydrogen target used in the experiment. The 35 cm long Q{sub weak} target was designed to withstand 180 #mu#A of beam current. Although this is the highest power cryotarget ever built, the target must also provide < 50 ppm of target noise under these demanding conditions, which makes it the lowest noise target ever built at the same time. These seemingly mutually exclusive goals have both been met. The target will be described, and measurements of its performance will be presented.

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BibTeXRIS

Smith, Gregory R.. 2012-07-01. Q{sub weak} target performance. https://doi.org/10.1393/ncc%2Fi2012-11297-2

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