A bunch killer for the NSLS x-ray electron storage ring

Technical Report · Thu Jul 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/10173324· OSTI ID:10173324

Nawrocky, R J; Bergmann, U; Siddons, D P

In the NSLS x-ray electron storage ring, which operates at a harmonic number of 30, the beam may be stored in many different bunch patterns. The minimum spacing between bunches is approximately 19 nsec. While most of the experimenters are primarily interested in photon flux, some experiments are sensitive to bunch spacing. Time resolved nuclear resonance scattering experiments, for example, need pulses of x-rays spaced of the order of 100 nsec apart and a very low noise floor (10{sup {minus}6}) between pulses. Perhaps even more important than the level of the background is that it be reproducible and homogeneous in time. It has been found in practice that a small number of electrons always get trapped in the ``empty`` rf buckets during injection into the storage ring and remain as low level stray bunches. These extra bunches produce an unacceptable temporally localized, non-reproducible background which is difficult if not impossible to correct for. A ``bunch killer`` system based on the rf knockout technique has been developed and installed on the ring to remove the unwanted bunches. The authors describe the operation of this system and present experimental results to illustrate its effectiveness.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 10173324
• Report Number(s): BNL-49149; CONF-930511-263; ON: DE93017585; TRN: 93:016743
• Resource Relation: Conference: PAC `93: international particle accelerator conference,Washington, DC (United States),17-20 May 1993; Other Information: PBD: [1993]
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
NSLS
BACKGROUND NOISE
CONTROL
STORAGE RINGS
BEAM BUNCHING
BEAM INJECTION
EXPERIMENTAL DATA
PERFORMANCE
OPERATION
BETATRON OSCILLATIONS
FUNCTION GENERATORS
COLLISIONS
KICKER MAGNETS
AMPLIFIERS
RF SYSTEMS
PLASTIC SCINTILLATION DETECTORS
SYNCHRONIZATION
AUTOMATION
BEAM DYNAMICS
MODIFICATIONS
430400
430300
AUXILIARIES AND COMPONENTS