The introduction of trajectory oscillations to reduce emittance growth in the SLC linac
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
- National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Inst. of Nuclear Science
Emittance growth of accelerated beams in the 50 GeV linear accelerator of the Stanford Linear Collider (SLC) arises from the effects of transverse wakefields and momentum dispersion. These effects are caused by small misalignments of the beam position monitors, lattice quadrupoles, and accelerating structure and by the energy spectrum of the beam which changes along the accelerator. The introduction of strategically placed trajectory oscillations over finite lengths of the linac has been used to generate beam errors which cancel the emittance accumulation from these small unknown, random alignment errors. Induced oscillations early in the linac cancel effects which filament along the accelerator affecting mostly the beam core. Induced oscillations located at the center of the accelerator or beyond cancel wakefield and dispersion errors which do not completely filament but cause the beams to have, in addition, an apparent betatron mismatch and transverse tails. The required induced oscillations of a few hundred microns are reasonably stable over a period of several weeks. Of course, the optimum induced oscillations depend upon the beam charge. Emittance reductions of 30 to 50% have been obtained.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6834269
- Report Number(s):
- SLAC-PUB-5705; CONF-920706-49; ON: DE93006925
- Resource Relation:
- Conference: International conference on high energy accelerators, Hamburg (Germany), 20-24 Jul 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STANFORD LINEAR COLLIDER
BEAM EMITTANCE
ALIGNMENT
BEAM MONITORS
COLLIDING BEAMS
OPERATION
OSCILLATIONS
STABILITY
TRAJECTORIES
ACCELERATOR FACILITIES
ACCELERATORS
BEAMS
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
MONITORS
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics