Showing papers in "Particle Accelerators in 1981"

Capture of Cooling Electrons by Cool Protons

Abstract: Simplified formulae for the capture of low-energy electrons by stationary protons are averaged over Maxwellian and "flattened" Maxwellian electron velocity distributions. The latter distribution is more nearly appropriate for electron beams used in accelerator proton-beam cooling experiments. Flattening increases the capture rate by a factor of about two. Similar formulae for the capture of antiprotons by protons are mentioned.

The attenuation of the neutron dose equivalent in a labyrinth through an accelerator shielding

Abstract: The attenuation of neutron dose equivalent in concrete labyrinths with rectangular bends was studied by means of neutron sources and rem counters. The number of bends, the length of each section, and the width of the labyrinth could be varied. The results of these measurements were compared with the dose equivalent attenuation found in a labyrinth at the DESY 7-GeV electron synchrotron, with published data from a proton accelerator and from a nuclear reactor. An empirical formula describing the neutron dose equivalent is presented.

Electron Cooling in Storage Rings

Abstract: It is found that the effect of '"flattening" of the electron velocity distribution is to increase the rate of cooling of small betatron oscillations by a factor of 2.4, and not by a factor of 4 as often quoted. This is when the cooler magnetic field is ignored. When it is allowed for, in the usual way, the cooling rate involves a divergent integral whose regulation depends on the details of particular cases. to Y. ORLOV

Research on high beam-current accelerators

Abstract: LBL-12210 Preprint ~. UNIVERSITY OF CALIFORNIA Accelerator . . Rese rch lVI U I n To be published in Particle Accelerators RESEARCH ON HIGH BEAM-CURRENT ACCELERATORS Denis Keefe TWO-WEEK lOAN COPY April 1981 This is a library Circulating Copy which may be borrowed for two weeks. For a personal retention copy, call Tech. Info. Diu is ion, Ext. 6782 Prepared for the U.S. Department of Energy under Contract W-7405-ENG-48

Elementary spinor algebra for polarized beams in storage rings

Abstract: Two-component spinors and Pauli matrices can usefully be applied to classical problems of rotations in three dimensions. In particular, they constitute a concise method of analyzing problems of spin motion in storage rings and accelerators. An elementary treatment of spinor algebra is developed and applied to some fundamental kine­ matics of polarized beams in storage rings and to the basic configuration of the Siberian Snake scheme. Further possibilities of the formalism are indicated.