Abstract
Bunch length and energy-$z$ correlation measurements were performed on the high energy (28.5 GeV) electron test beam of the A-line and End Station A (ESA) facilities at the SLAC National Accelerator Laboratory. The longitudinal profile of each bunch was measured by imaging the synchrotron light emitted as the electrons traversed a highly dispersive bend after being streaked by a transverse rf deflecting cavity. In addition, high frequency diodes and pyroelectric detectors placed at a ceramic gap in the beam line were used to measure the length of the bunch in ESA.
Highlights
While it is normally quite simple to image the transverse profile of a beam, measuring the longitudinal profile is considerably more difficult
This paper presents two methods for the measurement of the length of a bunch, including one that provides the momentum-z correlation that exists within the bunch
ABSOLUTE MEASUREMENT The absolute measurement of the bunch length and energy spread at the end of the linac was accomplished by imaging the synchrotron light emitted from the beam as it moved around the A-line bend
Summary
While it is normally quite simple to image the transverse profile of a beam (e.g. by having the beam impact a phosphorescent screen), measuring the longitudinal profile is considerably more difficult. This paper presents two methods for the measurement of the length of a bunch, including one that provides the momentum-z correlation that exists within the bunch (where z is the longitudinal position coordinate). Of these two methods, one provides an absolute measurement of the bunch length and momentum spread, but requires a relatively special setup of the machine optics that may make it unsuitable in a lot of situations, while the second method provides a relative measure of changes in the length of the bunch, but has fewer limitations on the locations in which it can be used
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