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Title CEBAF injector achieved world's best beam quality for three simultaneous beam sith a wide range of bunch charges
Abstract The CEBAF accelerator provides interleaved 499 MHz electron beams, spanning 5 decades in beam intensity (a few nA to 200 mA), to three experimental halls simultaneously. The physics program became more challenging when the G0 experiment was approved, requiring more than six times higher bunch charge than is routine. This experiment requires up to 8 million electrons per bunch at a reduced repetition rate of 31 MHz, while the lowest current hall simultaneously receives 100 electrons per bunch. A bunch destined for one hall may experience significant space charge forces, while the next bunch may have negligible space charge. This disparity in beam intensity must be maintained while delivering ¿best ever¿ values in rms beam quality, including relative energy spread (<2.5x10-5) and normalized transverse emittance (<1 mm-mrad). Space charge difficulties emerge in the 10m long, 100 keV section of the CEBAF injector during initial bunch formation and spin manipulation. A series of changes was
Author(s) Reza Kazimi, Kevin Beard, Jay Benesch, Arne Freyberger, Joe Grames , Tommy Hiatt , Andrew Hutton, Geoffrey Krafft , Lia Merminga, Matthew Poelker, Mike Spata, Michael Tiefenback, Byung Yunn, Yuhong Zhang
Publication Date July 2004
Document Type Meeting
Primary Institution Thomas Jefferson National Accelerator Facility, Newport News
Affiliation / /
Funding Source
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-ACO-04-251 OSTI Number: 827516
LANL Number: Other Number:
Associated with an experiment No
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Meeting / Conference
Meeting Name EPAC 2004
Meeting Date 7/5/2004
Document Subtype Poster
Attachments/Datasets/DOI Link
Document(s)
TUPLT164final.pdf (STI Document)
Dataset(s) (none)
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