Luminosity lifetime in the Tevatron

Conference · Thu Jun 09 04:00:00 EDT 1988

OSTI ID:7142456

Jackson, G; Finley, D; Johnson, R P; Kerns, Q; McCarthy, J; Siemann, R; Zhang, P

Since the inauguration of colliding proton-antiproton operations in 1987, the Tevatron has exhibited luminosity lifetimes shorter than expected. During a typical colliding beam storage period, called a store, luminosity is calculated periodically by measuring the charge and emittances of each bunch. The growth of the transverse bunch emittances is the dominant cause of luminosity deterioration. Throughout, this period, the position spectrum of the bunches exhibited betatron signals larger than expected from Schottky noise. A model assuming externally driven betatron oscillations explains both the betatron signals and the emittance growth. A program is underway to improve the Tevatron luminosity lifetime. The abort kickers have been identified as sources of emittance growth, and some quadrupole power supplies are further candidates. Because the horizontal dispersion through the RF cavities is nonzero, RF phase noise has been investigated. Noise in the main dipole regulation circuit has also been studied. 13 refs., 4 figs.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (USA)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 7142456
• Report Number(s): FNAL/C-88/80; CONF-880695-46; ON: DE88014110
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
ACCELERATORS
BEAM EMITTANCE
CYCLIC ACCELERATORS
DATA
EXPERIMENTAL DATA
FERMILAB TEVATRON
INFORMATION
LIFETIME
LUMINOSITY
NOISE
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SYNCHROTRONS