Lifetime and performance of NSLS storage rings

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7004133

Halama, H J

The performance of synchrotron light sources is measured primarily in terms of beam lifetime, beam size, and the recovery of normal operation after a section of the machine has been brought to atmospheric pressure. The beam lifetime and the beam size depend on the following phenomena: Beam gas interaction which can be either elastic or inelastic scattering on residual gas nuclei or electrons. With the exception of low energy machines, this phenomenon represents the main limiting factor on lifetime; Beam interaction with trapped ions causing both beam loss and defocussing. Residual gas molecules are ionized both by circulating beam and synchrotron radiation. The cross sections for both processes are comparable. The effects of this phenomenon are most troublesome at low energies. The problem can be eliminated by switching to positron beams. Installing clearing electrodes has also been successful; Intrabeam scattering (Touschek effect) is caused by Coulomb scattering among electrons of the same bunch as they execute betatron oscillations. The Touschek effect is strongly dependent on energy and in general is a problem only in low energy machines; and Various instabilities causing both slow and fast beam decay which have been observed in both NSLS rings. A special case due to dust particles that fall into the electron beam is commonly observed in early stages of conditioning. Coherent collective instabilities will not be discussed in this paper. 19 refs., 4 figs., 1 tab.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7004133
• Report Number(s): BNL-41554; CONF-880552-5; ON: DE88015716
• Resource Relation: Conference: Topical conference on vacuum design of advanced and compact synchrotron light sources, Upton, NY, USA, 16 May 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
STORAGE RINGS
PERFORMANCE
EXTREME ULTRAVIOLET RADIATION
INSTABILITY
LIFETIME
LIGHT SOURCES
NSLS
SCATTERING
X-RAY SOURCES
ACCELERATORS
CYCLIC ACCELERATORS
ELECTROMAGNETIC RADIATION
EQUIPMENT
RADIATION SOURCES
RADIATIONS
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
ULTRAVIOLET RADIATION
X-RAY EQUIPMENT
430400* - Particle Accelerators- Storage Rings