120702997
POSITIVE PION PRODUCTION BY POLARIZED BREMSSTRAHLUNG
By selecting bremsstrahlung produced in a 0.003-in. aluminum radiator at a small angle from the original electron direction, a beam of polarized bremsstrahlung has been obtained from the Stanford linear accelerator. The variation of the polarization and intensity with angle was studied and compared with theoretical predictions. The polarized beam has been used to study pi /sup +/-meson production at 90 deg c.m. angle and photon energies of 242, 296. 337. and 376 Mev. The ratio of meson production along and at right angles to the electric field vector has been measured and compared wiih the values predicted by the relativistic dispersion relation. (auth)
120702997
POSITIVE PION PRODUCTION BY POLARIZED BREMSSTRAHLUNG
By selecting bremsstrahlung produced in a 0.003-in. aluminum radiator at a small angle from the original electron direction, a beam of polarized bremsstrahlung has been obtained from the Stanford linear accelerator. The variation of the polarization and intensity with angle was studied and compared with theoretical predictions. The polarized beam has been used to study pi /sup +/-meson production at 90 deg c.m. angle and photon energies of 242, 296. 337. and 376 Mev. The ratio of meson production along and at right angles to the electric field vector has been measured and compared wiih the values predicted by the relativistic dispersion relation. (auth)
430568
SMALL-ANGLE PION FLUX PRODUCED IN A THICK BERYLLIUM TARGET BY HIGH-ENERGY ELECTRONS.
The pion yield produced by 16-GeV electrons in a 0.6 radiation length beryllium target was studied at laboratory angles of 0.2’ to 1. lo. The experimental yields are somewhat larger than those estimated using the Drell and p -diffraction models for pion photoproduction, and they do not appear to decrease at small angles as expected from the theoretical models. (Submitted to Physical Review Letters) * Work supported by the U. S. Atomic Energy Commission. ‘On leave from CERN.
121680831
MULTIPLE SCATTERING OF 600-Mev ELECTRONS IN THIN FOILS
The beam of the Stanford Mark III linear accelerator was used to measure the width of the angular distribution of electrons multiply scattered in thin Dc, Al, and Au foils. The results are in agreement with the predictions of the Moliere theory. (auth)
8937485
Deep inelastic scattering: The Early years
The 1990 Nobel Prize for Physics lecture is reprinted. The author discusses the early research at the High Energy Physics Laboratory at Stanford in the 1950's and the building of the Stanford Linear Accelerator Center in the 1960's. (AIP)
126354165
ELECTRON - PROTON SCATTERING AT LOW MOMENTUM ENERGIES
882195
MAGNETIC MEASUREMENTS OF QUADRUPOLE FOCUSING MAGNETS AT SLAC*
\ A rotating coil technique was used to find the m gnetic centers of l?r quadrupole magnets used in the final focus of high en gy-electron and positron beams in the SLAC Linear Collider at the Stanford Linear Accelerator Center. These methods provide interesting applications of classical electromagnetic theory for use in the undergraduate class. Submitted to The American Journal of Physics. * Work supported by Department of Energy contract DE-AC03-76SFOO515. I. THE STANFORD LINEAR COLLIDER The newest experiments at Stanford Linear Accelerator Center (SLAC) use the SLAC Linear Collider, the SLC. Electrons and positrons, accelerated in the two-mile-long 50 GeV linear accelerator, crash head on in a prolific burst of subnuclear particles. To help capture and study the results of these collisions, physicists at SLAC and 32 other institutions have constructed a state of the art particle detector, the SLC Large Detector, or SLD. One of the most sophisticated machines in the world using the newest technology in detectors, SLD began receiving the first beams in mid-1991. In order to achieve the highest possible luminosity, the electron beams must be focused down to a very tiny spot at the interaction point. But the large magnetic fields (0.6 T) employed in this detector, along with the need to put instrumentation as close to the interaction point as possible, precludes the use of iron in the final focusing magnets.1 Thus the decision was made to use superconductors in the final focusing magnets, the so-called Superconducting Final Focus. Superconductors avoid the use of iron, which would distort the detector’s own magnetic field. Additionally, superconductors provide the ability to use extremely high currents to produce larger magnetic fields than can be obtained conventionally. Larger magnetic fields produce stronger focusing, so that the beam can be reduced to a much smaller spot, enhancing the probability of collisions. The