Proton accumulator ring injection studies

Conference · Sat Jan 01 04:00:00 EST 1977

OSTI ID:5446176

Cooper, R K; Neil, V K

Protons may be created in an accelerator or storage ring by stripping electrons from neutral hydrogen atoms that have been injected into the machine. Because Liouville's theorem is violated by this type of injection, particles may be continually injected into a region of phase space that is already populated, and the density in that region increases with time. A computational investigation was made of the evolution of the distribution of particles in longitudinal phase space during such an injection process for a storage ring operating below the transition energy. In one calculation, an rf cavity is present in the ring and particles are injected into the stable phase region once each revolution. The purpose of this calculation is to determine the rf voltage necessary to overcome the longitudinal self-forces and contain the particles within the region of stable phase. In a second calculation, the rf is turned off, so that there is spreading in azimuth of the injected particles (i.e., de-bunching). The de-bunching occurs because of the initial energy spread and the action of the self-forces. One purpose of the calculation is to determine the total energy spread after a given number of revolutions. Another purpose is to elucidate the effect of finite resistance in the vacuum tank walls. For sufficiently high current, the finite resistance can cause bunching of a beam that is initially uniform in azimuth. Therefore it might be expected that the finite resistance would inhibit or prevent de-bunching once the number of particles injected reaches some threshold, and that this threshold would depend upon the energy spread in the beam.

• Research Organization: Los Alamos Scientific Lab., N.Mex. (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5446176
• Report Number(s): LA-UR-77-1291; CONF-770709-2
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430400* -- Particle Accelerators-- Storage Rings
BEAM BUNCHING
BEAM DYNAMICS
BEAM INJECTION
BEAMS
CALCULATION METHODS
CAVITY RESONATORS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MATHEMATICAL MODELS
MATHEMATICAL SPACE
NUCLEON BEAMS
PARTICLE BEAMS
PHASE SPACE
PHYSICAL PROPERTIES
PROTON BEAMS
SPACE
STORAGE RINGS
VACUUM SYSTEMS