Gold beam losses at the AGS Booster injection

Author

Zhang, S.Y. ; Ahrens, L.A.

Author_Institution

AGS Dept., Brookhaven Nat. Lab., Upton, NY, USA

Volume

5

fYear

1999

fDate

1999

Firstpage

3294

Abstract

Gold beam injection efficiency decreases in proportional to the beam loss in the AGS Booster. A close look shows that large number of electrons, ions, and neutral particles are created when the gold beam scrapes wall. To investigate the neutral particle production due to the beam loss, local vacuum measurement was made during the 1998 run. It shows that the pressure created by the Booster Au³¹⁺ beam loss at injection has a 35 ms decay time constant. The beam loss created pressure bump in the ring is about 20 meters long. When 3×10⁹ gold ions scrapes wall, a pressure higher than 10^-7 Torr was created. The beam lifetime calculated using these parameters is in agreement with the observed one

Keywords

booster injectors; ion accelerators; particle beam injection; particle beam stability; synchrotrons; AGS Booster injection; Au³¹⁺ beam loss; beam lifetime; beam loss created pressure bump; gold beam injection efficiency; gold beam losses; local vacuum measurement; neutral particle production; Capacitance; Computer crashes; Electrons; Gold; Particle beam injection; Particle production;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.792281

Filename

792281