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Title: Turn-by-Turn Imaging of the Transverse Beam Profile in PEP-II

Abstract

During injection or instability, the transverse profile of an individual bunch in a storage ring can change significantly in a few turns. However, most synchrotron-light imaging techniques are not designed for this time scale. We have developed a novel diagnostic that enhances the utility of a fast gated camera by adding, inexpensively, some features of a dual-axis streak camera, in order to watch the turn-by-turn evolution of the transverse profile, in both x and y. The beam's elliptical profile is reshaped using cylindrical lenses to form a tall and narrow ellipse--essentially the projection of the full ellipse onto one transverse axis. We do this projection twice, by splitting the beam into two paths at different heights, and rotating the ellipse by 90{sup o} on one path. A rapidly rotating mirror scans these vertical ''pencils'' of light horizontally across the photocathode of the camera, which is gated for 3 ns on every Nth ring turn. A single readout of the camera captures 100 images, looking like a stroboscopic photograph of a moving object. We have observed the capture of injected charge into a bunch and the rapid change of beam size at the onset of a fast instability.

Authors:
; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
896414
Report Number(s):
SLAC-PUB-11851
TRN: US0700838
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at 12th Beam Instrumentation Workshop (BIW06), Fermilab, Batavia, Illinois, 1-4 May 2006
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM PROFILES; CAMERAS; IMAGES; INSTABILITY; LENSES; MIRRORS; PHOTOCATHODES; STORAGE RINGS; STREAK CAMERAS; Accelerators, Instrumentation,ACCPHY, INST

Citation Formats

Fisher, Alan A., Petree, Mark, and /SLAC. Turn-by-Turn Imaging of the Transverse Beam Profile in PEP-II. United States: N. p., 2006. Web.
Fisher, Alan A., Petree, Mark, & /SLAC. Turn-by-Turn Imaging of the Transverse Beam Profile in PEP-II. United States.
Fisher, Alan A., Petree, Mark, and /SLAC. Mon . "Turn-by-Turn Imaging of the Transverse Beam Profile in PEP-II". United States. doi:. https://www.osti.gov/servlets/purl/896414.
@article{osti_896414,
title = {Turn-by-Turn Imaging of the Transverse Beam Profile in PEP-II},
author = {Fisher, Alan A. and Petree, Mark and /SLAC},
abstractNote = {During injection or instability, the transverse profile of an individual bunch in a storage ring can change significantly in a few turns. However, most synchrotron-light imaging techniques are not designed for this time scale. We have developed a novel diagnostic that enhances the utility of a fast gated camera by adding, inexpensively, some features of a dual-axis streak camera, in order to watch the turn-by-turn evolution of the transverse profile, in both x and y. The beam's elliptical profile is reshaped using cylindrical lenses to form a tall and narrow ellipse--essentially the projection of the full ellipse onto one transverse axis. We do this projection twice, by splitting the beam into two paths at different heights, and rotating the ellipse by 90{sup o} on one path. A rapidly rotating mirror scans these vertical ''pencils'' of light horizontally across the photocathode of the camera, which is gated for 3 ns on every Nth ring turn. A single readout of the camera captures 100 images, looking like a stroboscopic photograph of a moving object. We have observed the capture of injected charge into a bunch and the rapid change of beam size at the onset of a fast instability.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Dec 18 00:00:00 EST 2006},
month = {Mon Dec 18 00:00:00 EST 2006}
}

Conference:
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