Injecting a Kapchinskij-Vladimirskij distribution into a proton synchrotron

Conference · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:83105

Crosbie, E ^[1]; Symon, K ^[2]

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1. Argonne National Lab., IL (United States)
2. Wisconsin Univ., Madison, WI (United States). Dept. of Physics

Recently it has been suggested that the Kapchinskij Vladimirskij (KV) distribution may be of practical interest for high intensity machines in that it may provide the maximum space charge limit for such a machine. One can be make a plausible argument that the maximum beam intensity is obtained for a distribution for which all particles have the same tune, at least when the resonance is approached. Therefore, the following steps should be taken: first, reduce the chromaticity of the accelerator ring as much as possible, and second, make the betatron frequencies independent of amplitude, i.e., make the focusing forces linear. One way to make the focusing forces linear is to start with external focusing forces which are linear, and then make the space charge forces also linear by using a K-V distribution. Sections II and III describe two injection scenarios which produce a KV distribution (if we neglect beam-beam interactions during the injection process.) Simulations of these injection scenarios verify that the resulting distribution produces a uniform circular beam in xy-space. A simulation code was written which also includes the space charge interactions between the 500 injected turns in the proposed scenarios; the results are given in section IV. The space charge forces have a substantial effect on the resulting distribution.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 83105
• Report Number(s): ANL/ASD/CP--85051; CONF-950512--229; ON: DE95013759
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM EMITTANCE
BEAM INJECTION
COMPUTERIZED SIMULATION
PROTON BEAMS
SPACE CHARGE
SYNCHROTRONS