Operation of PEP longitudinal feedback system
In order to suppress longitudinal coupled-bunch oscillations which might limit the capabilities of PEP, the 18 GeV e/sup +/e/sup -/ storage ring at SLAC, a longitudinal feedback system is utilized. A frequency domain feedback system was chosen with the frequency spectrum of the stored beam being sampled close to a symmetry point in the ring where the feedback cavity itself is also located. The symmetry point chosen is symmetry point 5 which lies half-way between interaction regions 4 and 6. The system has been installed in PEP and is now operational. However, at stored currents up to the maximum stored in PEP to date at 14.5 GeV (approximately 40 mA in 6 bunches), the ring has been stable to all modes of longitudinal coupled-bunch oscillations both barycentric and the other fundamental modes. By deliberately detuning the main accelerating cavities, small multibunch oscillations can be introduced which, in turn, can be damped by the feedback system. Under optimized beam conditions the feedback system could be adjusted to positive feedback and excite oscillations with relatively small power to the feedback cavity. This will be described along with other details of the system.
- Research Organization:
- Stanford Linear Accelerator Center, CA (USA)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6505671
- Report Number(s):
- SLAC-PUB-2670; CONF-810314-155; PEP-NOTE-351; TRN: 81-009439
- Resource Relation:
- Conference: Particle accelerator conference, Washington, DC, USA, 11 Mar 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PEP STORAGE RINGS
BEAM BUNCHING
BEAM MONITORS
ELECTRON BEAMS
FEEDBACK
GEV RANGE 10-100
PERFORMANCE
PHASE STABILITY
POSITRON BEAMS
BEAM DYNAMICS
BEAMS
ENERGY RANGE
GEV RANGE
LEPTON BEAMS
MEASURING INSTRUMENTS
MONITORS
PARTICLE BEAMS
STABILITY
STORAGE RINGS
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics