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Hall C

is the first experimental area to become operational. The initial equipment includes two general purpose magnetic spectrometers: the High Momentum Spectrometer (HMS), which has a large solid angle, a moderate resolution (), and a maximum momentum of 6 GeV/c; and the Short Orbit Spectrometer (SOS), which has a large momentum acceptance and a very short (7.4 meter) optical path for use in detecting particles having a short lifetime, such as low momentum 's and K’s. The HMS has already achieved its design specifications and the SOS spectrometer will begin operation shortly. The initial experimental program will include an investigation of the validity of quark counting rules in the photodisintegration of the deuteron, measurements of the neutron electric form factor, and studies of kaon electro-production.

Hall C is also the area foreseen for the installation of specialized detectors designed to investigate specific problems. For example, a prototype spectrometer system is being constructed to investigate the feasibility of performing hypernuclear physics experiments. Another planned specialized apparatus is the G0 spectrometer, an 8-sector focusing spectrometer to be used in precision measurements of parity violation in the scattering of polarized electrons from protons to investigate their weak neutral current structure and possible contributions from strange quarks.


cardman@cebaf.gov