Measurement of the longitudinal parameters of an electron beam in a storage ring
We discuss the determination of the longitudinal parameters of a bunched beam of electrons or positrons circulating in a storage ring. From the analysis of the beam current observed at a fixed azimuthal location, one can learn much about the longitudinal behavior. We present an elementary analysis of the time-dependence of the current. In particular, we discuss the determination of the average current, bunch length, synchrotron oscillation frequency, and the coherent synchrotron oscillation modes associated with longitudinal instabilities. A brief discussion is also given of the incoherent synchrotron oscillations, or Schottky noise. We review the electromagnetic field traveling with a charge in uniform motion, and introduce some of the most common devices used to detect this field: capacitive pick-up, stripline monitor, and DC beam current transformer. Our paper is organized as follows: We discuss the analysis of the time-dependence of the beam current. Then, the measurement of the current is considered. Finally, we describe some measurements of energy spread and bunch lengthening made recently at SLAC on the SLC damping ring. 12 refs., 6 figs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6296352
- Report Number(s):
- BNL-42580; CONF-8810356-1; ON: DE89010570
- Resource Relation:
- Conference: Joint US/Cern accelerator school, Capri, Italy, 20 Oct 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BEAM CURRENTS
STORAGE RINGS
BEAM DYNAMICS
BEAM BUNCHING
ELECTROMAGNETIC FIELDS
ELECTRON BEAMS
INSTABILITY
SYNCHROTRON OSCILLATIONS
TIME DEPENDENCE
BEAMS
CURRENTS
LEPTON BEAMS
OSCILLATIONS
PARTICLE BEAMS
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics