Longitudinal phase space setup for the SLC beams

Conference · Wed Jul 01 04:00:00 EDT 1998

DOI:https://doi.org/10.1109/PAC.1997.749715· OSTI ID:674889

Decker, F J; Bane, K L.F.; Minty, M G; Raimondi, P ^[1]; Holtzapple, R L ^[2]

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1. Stanford Univ., CA (US). Stanford Linear Accelerator Center
2. Cornell Univ., Ithaca, NY (US)

The longitudinal phase space distribution of the SLC beams is affected by many different machine parameters and constraints. By using a technique of over-compression in the ring to linac transfer line, a small energy spread of 0.12% can be achieved at the end of the linac for a bunch length of 1.2 mm ({sigma}). In the final focus a small energy spread is desirable to reduce emittance dilution due to chromatic effects. Optimization of the bunch length is also important as a longer bunch of 1.2 mm can contribute up to 40% luminosity enhancement due to disruption. If there is a correlated energy variation along the bunch, for example due to mistuning of the optimal rf phase with respect to the beam, the bunch will be further compressed as it passes through the SLC Arcs. The resulting bunch can be too short to produce the desired disruption enhancement, but will radiate more beam-strahlung during collisions giving a false indication of higher luminosity. This paper discusses the interplay of these issues from the damping ring to the interaction point.

• Research Organization: Stanford Univ., Stanford Linear Accelerator Center, CA (US)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 674889
• Report Number(s): SLAC-PUB--7892; CONF-970503--; ON: DE98059259
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
DAMPING
DILUTION
DISTRIBUTION
LINEAR ACCELERATORS
LUMINOSITY
OPTIMIZATION
PHASE SPACE