R. D. Ehrlich

A source of highly polarized electrons at the stanford linear accelerator center

Abstract A polarized electron source based upon photoionization of a state-selected 6 Li atomic beam has been developed as an injection gun for the Standford two-mile electron linear accelerator. The source (PEGGY) produces a pulsed beam of electrons with a maximum intensity of 2.6×10 9 electrons per pulse, a polarization of 0.85, a pulse length of 1.6 μs, and a repitition rate of 180 pulses/s. Since its installation at SLAC in July 1974, PEGGY has been used in several energy electron-nucleon scattering experiments.

Measurements of polarization in K−p elastic scattering at low energies

Abstract The polarization parameter has been measured in K−p elastic scattering at eight incident beam momenta between 650 MeV/c and 1071 MeV/c throughout a center of mass angular range of −0.75 cos θ ∗ . Experimental results and coefficients of Legendre polynomial fits to the data are presented and compared with other measurements and partial wave analysis.

A Search for Parity Violation in the Inelastic Scattering of Polarized Electrons from Deuterium at 19.4-GeV

A search for partity violating effects in the inelastic scattering of polarized electrons off an unpolarized deuterium target at 19.4 GeV has recently been performed at SLAC. Using the 20‐GeV/c and 8‐GeV/c spectrometers, two kinematical points with Q2 values of 1.2 GeV/c2 and 4.2 GeV/c2, respectively, were measured. Statistical accuracy of the measurements approaches the level of the weak interactions. Systematic errors and the present status of the data analysis are discussed.