Measured optimum BNS damping configuration of the SLC linac
Transverse wakefield (or BNS{sup 1}) damping has been successfully used in the linac of the Stanford Linear Collider (SLC) to reduce emittance enlargement from beam trajectory jitter coupled with transverse wakefields. The authors are presently in the process of raising the bunch intensities from 3 x 10{sup 10} particles per bunch to over 4 x 10{sup 10}. With these higher currents the RF phasing configuration which produces BNS damping must be improved. Too little damping allows excessive emittance growth from jitter but too much damping increases emittance growth from chromatic effects and produces an unacceptable loss of overall energy. Several experiments were performed to find the optimum settings for the present situation. An empirical optimum was found with a combination of (1) somewhat stronger BNS RF phase settings in the upstream section of the linac and (2) a stronger quadrupole lattice in the downstream section.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 10114929
- Report Number(s):
- SLAC-PUB--6204; CONF-930511--506; ON: DE94005236
- Country of Publication:
- United States
- Language:
- English
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