Double rf system for bunch shortening

Conference · Thu Nov 01 00:00:00 EST 1990

OSTI ID:6185482

Chin, Yong Ho

It was suggested by Zisman that the combination of the two systems (double rf system) may be more effective to shorten a bunch, compromising between the desirable and the undesirable effects mentioned above. In this paper, we demonstrate that a double rf system is, in fact, quite effective in optimizing the rf performance. The parameters used are explained, and some handy formulae for bunch parameters are derived. We consider an example of bunch shortening by adding a higher-harmonic rf system to the main rf system. The parameters of the main rf system are unchanged. The double rf system, however, can be used for another purpose. Namely, the original bunch length can be obtained with a main rf voltage substantially lower than for a single rf system without necessitating a high-power source for the higher-harmonic cavities. Using a double rf system, the momentum acceptance remains large enough for ample beam lifetime. Moreover, the increase in nonlinearity of the rf waveform increases the synchrotron tune spread, which potentially helps a beam to be stabilized against longitudinal coupled-bunch instabilities. We will show some examples of this application. We discuss the choice of the higher-harmonic frequency.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6185482
• Report Number(s): LBL-29622; CONF-9010276-3; ON: DE91009094; TRN: 91-008203
• Resource Relation: Conference: International workshop on accelerators for asymmetric B-factories, Tsukuba (Japan), 4-6 Oct 1990
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM BUNCHING
RF SYSTEMS
BEAM PROFILES
COLLIDING BEAMS
HAMILTONIANS
HARMONICS
PERFORMANCE
PHASE SPACE
STORAGE RINGS
SYNCHROTRON OSCILLATIONS
BEAM DYNAMICS
BEAMS
MATHEMATICAL OPERATORS
MATHEMATICAL SPACE
OSCILLATIONS
QUANTUM OPERATORS
SPACE
430303* - Particle Accelerators- Experimental Facilities & Equipment
430200 - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics