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Ion instability experiments on the ALS

Conference ·
OSTI ID:491584
;  [1]; ; ; ; ; ;  [2];  [3]
  1. Lawrence Berkeley National Lab., CA (United States)
  2. Stanford Linear Accelerator Center, Menlo Park, CA (United States)
  3. CERN, Geneva (Switzerland). PS Div.
+ Show Author Affiliations
The authors report the results of experiments to study ion effects at the Advanced Light Source (ALS) in two pressure regimes. At the nominal pressure of 0.25 nTorr, they observe small vertical coherent beam oscillations for the nominal filling pattern (2.5% gap) that correlate with the expected ion frequency for nitrogen or carbon monoxide. The signals disappear for larger gaps in the filling pattern. They observe little increase in vertical beam size. They have also made experiments to look for unconventional ion effects at elevated gas pressures that may be important for future accelerators. In these experiments, they introduce a single gas species (helium) into the storage ring, raising the pressure approximately two orders of magnitude above the nominal pressure. For filling patterns with gaps in the bunch train large enough that conventional ion trapping should not play a role, they observe roughly a doubling of the vertical beam size along with coherent beam oscillations. They compare the results of the experiments with the predictions of one possible mechanism: the fast beam-ion instability.
Research Organization:
Stanford Linear Accelerator Center, Menlo Park, CA (United States); Lawrence Berkeley National Lab., CA (United States)
Sponsoring Organization:
USDOE Office of Energy Research, Washington, DC (United States); European Organization for Nuclear Research, Geneva (Switzerland)
DOE Contract Number:
AC03-76SF00515; AC03-76SF00098
OSTI ID:
491584
Report Number(s):
SLAC-PUB--7389; CONF-9609198--8; ON: DE97006458
Country of Publication:
United States
Language:
English

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Related Subjects

43 PARTICLE ACCELERATORS
ADVANCED LIGHT SOURCE
BEAM DYNAMICS
BEAM EMITTANCE
ELECTRON BEAMS
INSTABILITY
IONS
PRESSURE DEPENDENCE
VACUUM SYSTEMS