Bunch lengthening in the SLC (Stanford Linear Collider) damping rings

Conference · Wed Jan 31 23:00:00 EST 1990

OSTI ID:7004020

Bane, K L.F.

A high level of current dependent bunch lengthening has been observed on the North damping ring of the Stanford Linear Collider (SLC). At currents of 3 {times} 10{sup 10} this behavior does not appear to degrade the machine's performance significantly. However, at the higher currents that are envisioned for the future one fears that its performance could be greatly degraded due to the phenomenon of bunch lengthening. This was the motivation for the work described in this paper. In this paper we calculate the longitudinal impedance of the damping ring vacuum chamber. More specifically, in this paper we find the response function of the ring to a short Gaussian bunch, which we call the Green function wake. In addition, we try to estimate the relative importance of the different vacuum chamber objects, in order to see how we might reduce the ring impedance. This paper also describes bunch length measurements performed on the North damping ring. We use the Green function wake, discussed above, to compute the bunch lengthening. Then we compare these results with those obtained from the measurements. In addition, we calculate the current dependence of the tune distribution.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 7004020
• Report Number(s): SLAC-PUB-5177; CONF-8910357--2; ON: DE90010174
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
ACCELERATOR FACILITIES
ACCELERATORS
BEAM BUNCHING
BEAM DYNAMICS
CALCULATION METHODS
ELECTRIC IMPEDANCE
FUNCTIONS
GREEN FUNCTION
HAMILTONIANS
IMPEDANCE
LINEAR ACCELERATORS
MATHEMATICAL OPERATORS
QUANTUM OPERATORS
STANFORD LINEAR COLLIDER
TURBULENCE