First observations of a fast beam-ion instability at the ALS

Technical Report · Thu May 01 00:00:00 EDT 1997

DOI:https://doi.org/10.2172/521635· OSTI ID:521635

Byrd, J.; Thomson, J. ^[1]; Chao, A.; Heifets, S.; Minty, M.; Seeman, J.; Stupakov, G.; Zimmermann, F. ^[2]; Raubenheimer, T. O. ^[3]

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1. Lawrence Berkeley National Lab., CA (United States)
2. Stanford Linear Accelerator Center, Menlo Park, CA (United States)
3. CERN, Geneva (Switzerland). PS Div.

The authors report the results of experiments on a fast beam-ion instability at the Advanced Light Source (ALS). This ion instability, which can arise even when the ions are not trapped over multiple beam passages, will likely be important for many future accelerators. In the experiments, the authors filled the ALS storage ring with helium gas, raising the pressure approximately two orders of magnitude above the nominal pressure. With gaps in the bunch train large enough to avoid conventional (multi-turn) ion trapping, they observed a factor 2--3 increase in the vertical beam size along with coherent beam oscillations which increased along the bunch train.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 521635
• Report Number(s): SLAC-PUB-7512; CONF-970503-258; ON: DE97006829; TRN: 97:018450
• Resource Relation: Conference: 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997; Other Information: PBD: May 1997
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ADVANCED LIGHT SOURCE
BEAM DYNAMICS
TRAPPING
PHASE SPACE
INSTABILITY
EXPERIMENTAL DATA
BEAM BUNCHING
BEAM PROFILES