skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Longitudinal motion of the beam in the Fermilab booster

Abstract

When the Fermilab Booster Accelerator is operated at or above 1.5 x 10/sup 12/ protons per pulse (extraction current about 155 mA) large amplitude coupled bunch longitudinal dipole oscillations occur between transition and extraction times. The oscillations do not contribute to beam loss in the booster but, because the beam is transferred synchronously into preexisting buckets in the Main Ring, the oscillations contribute to a deterioration of beam quality in the main ring. Two mode numbers have been established for the instabilities and the primary source frequencies have been isolated, although the offending objects have not. Operation of one of the eighteen accelerating cavities at a harmonic number one unit lower than the operating value (83 instead of 84) effectively damps the motion by the introduction bunch to bunch synchrotron tune spread.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab., Batavia, IL (USA)
OSTI Identifier:
7307593
Report Number(s):
CONF-770313-108
TRN: 77-013182
DOE Contract Number:  
EY-76-C-02-3000
Resource Type:
Conference
Resource Relation:
Conference: Particle accelerator conference, Chicago, IL, USA, 16 Mar 1977
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; FERMILAB ACCELERATOR; BEAM DYNAMICS; BEAM BUNCHING; DAMPING; INSTABILITY; OSCILLATIONS; PARTICLE BOOSTERS; ACCELERATORS; CYCLIC ACCELERATORS; SYNCHROTRONS; 430200* - Particle Accelerators- Beam Dynamics, Field Calculations, & Ion Optics

Citation Formats

Ankenbrandt, C M, Griffin, J E, Johnson, R P, Lackey, J, and Meisner, K. Longitudinal motion of the beam in the Fermilab booster. United States: N. p., 1977. Web.
Ankenbrandt, C M, Griffin, J E, Johnson, R P, Lackey, J, & Meisner, K. Longitudinal motion of the beam in the Fermilab booster. United States.
Ankenbrandt, C M, Griffin, J E, Johnson, R P, Lackey, J, and Meisner, K. Sat . "Longitudinal motion of the beam in the Fermilab booster". United States. https://www.osti.gov/servlets/purl/7307593.
@article{osti_7307593,
title = {Longitudinal motion of the beam in the Fermilab booster},
author = {Ankenbrandt, C M and Griffin, J E and Johnson, R P and Lackey, J and Meisner, K},
abstractNote = {When the Fermilab Booster Accelerator is operated at or above 1.5 x 10/sup 12/ protons per pulse (extraction current about 155 mA) large amplitude coupled bunch longitudinal dipole oscillations occur between transition and extraction times. The oscillations do not contribute to beam loss in the booster but, because the beam is transferred synchronously into preexisting buckets in the Main Ring, the oscillations contribute to a deterioration of beam quality in the main ring. Two mode numbers have been established for the instabilities and the primary source frequencies have been isolated, although the offending objects have not. Operation of one of the eighteen accelerating cavities at a harmonic number one unit lower than the operating value (83 instead of 84) effectively damps the motion by the introduction bunch to bunch synchrotron tune spread.},
doi = {},
url = {https://www.osti.gov/biblio/7307593}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {1}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: