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AAIL/Tob/C-/J /-7/
Design of the Beam Shut-off Current Monitor
Upgrade for the Advanced Photon Source*
0
Anthony F. Pietryla and Glenn A. Decker
Advanced Photon Source, Argonne National Laboratory A
9700 S. Cass Ave., Argonne, IL 60439 i
Abstract. Plans to eliminate the positron accumulator ring (PAR) from the Advanced Photon
Source (APS) injector complex have created the need for a device to limit the allowable beam
charge injected into the APS injector synchrotron. The beam shut-off current monitor
(BESOCM) was chosen to provide this function. This new application of the BESOCM provided
the opportunity to explore new design philosophies. Two design goals were to de-emphasize
reliance on external signals and to become insensitive to timing variations. Both of these goals
were accomplished by deriving the trigger directly from the beam. This paper will discuss the
features of the new BESOCM design and present data demonstrating its function.
INTRODUCTION
The BESOCM system, in general, is designed to prevent excessive beam charge
from being accelerated. The previous design is currently used in two locations, at the
end of the APS linac and in the linac-to-PAR (LTP) transport line. Figure 1 shows
their locations. Both the linac BESOCM [1] and the LTP BESOCM are used to limit
the charge in a single macropulse to a specific level. If the level is exceeded, a set of
relay contacts will be opened signaling the Access Control and Interlock System
(ACIS) to interrupt generation of beam. These systems have been operational for more
than six years and have demonstrated exceptional reliability.
Plans are underway to remove the positron accumulator ring (PAR) from
operational use. When this occurs, electrons will be injected directly into the injector
synchrotron from the APS linac, which means the LTP BESOCM will not be used
during operations. Elimination of the PAR from operational use provided the
opportunity to upgrade the BESOCM system. The goals of the new design were to
become less susceptible to timing variations, decrease the sensitivity to one-time
events, and make the verification process simpler.
The BESOCM upgrade was commissioned in August 1999. The system so far has
only been used during direct injection studies. To date it has provided trouble-free
performance.
Work supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under contract
no. W-31-109-ENG-38.
The submitted manuscript has been created by the University of Chicago as operator of Argonne National Laboratory ("Argonne") under Contract No. w-31-109-ENG-38
with the U.S. Department of Energy. The U.S. Government retains for itself, and others acting on its behalf, a paid-up, nonexclusive, irrevocable worldwide license in said
article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government.
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Pietryla, A. & Decker, G. Design of the beam shut-off current monitor upgrade for the Advanced Photon Source, article, May 5, 2000; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc702486/m1/1/: accessed June 12, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.