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Study of Abnormal Vertical Emittance Growth in ATF Extraction Line

Conference · · Conf.Proc.C0806233:mopp003,2008
OSTI ID:1028688
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Since several years, the vertical beam emittance measured in the Extraction Line (EXT) of the Accelerator Test Facility (ATF) at KEK, that will transport the electron beam from the ATF Damping Ring (DR) to the future ATF2 Final Focus beam line, is significantly larger than the emittance measured in the DR itself, and there are indications that it grows rapidly with increasing beam intensity. This longstanding problem has motivated studies of possible sources of this anomalous emittance growth. One possible contribution is non-linear magnetic fields in the extraction region experimented by the beam while passing off-axis through magnets of the DR during the extraction process. In this paper, simulations of the emittance growth are presented and compared to observations. These simulations include the effects of predicted non-linear field errors in the shared DR magnets and orbit displacements from the reference orbit in the extraction region. Results of recent measurements using closed orbit bumps to probe the relation between the extraction trajectory and the anomalous emittance growth are also presented.
Research Organization:
SLAC National Accelerator Laboratory (SLAC)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-76SF00515
OSTI ID:
1028688
Report Number(s):
SLAC-PUB-14684
Conference Information:
Journal Name: Conf.Proc.C0806233:mopp003,2008
Country of Publication:
United States
Language:
English

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Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATOR FACILITIES
ACCELERATORS
Accelerators
ACCPHY
BEAM EMITTANCE
BEAM EXTRACTION
BEAM TRANSPORT
BEAMS
DAMPING
ELECTRON BEAMS
JAPANESE ORGANIZATIONS
MAGNETIC FIELDS
MAGNETS
MEETINGS
TEST FACILITIES