Detection of Instrumental Drifts in the PEP II LER BPM System

Conference · Wed Nov 07 04:00:00 EST 2007 · Conf.Proc.C070625:4261,2007

DOI:https://doi.org/10.1109/PAC.2007.4440089· OSTI ID:919410

Wittmer, W; Fisher, A S; Martin, D J; Sebek, J J

During the last PEP-II run a major goal was to bring the Low-Energy Ring optics as close as possible to the design. A large number of BPMs exhibited sudden artificial jumps that interfered with this effort. The source of the majority of these jumps had been traced to the filter-isolator boxes (FIBs) near the BPM buttons. A systematic approach to find and repair the failing units had been developed and implemented. Despite this effort, the instrumental orbit jumps never completely disappeared. To trace the source of this behavior a test setup, using a spare Bergoz MX-BPM processor (kindly provided by SPEAR III at SSRL), was connected in parallel to various PEP-II BPM processors. In the course of these measurements a slow instrumental orbit drift was found which was clearly not induced by a moving positron beam. Based on the size of the system and the limited time before PEP-II closes in Oct.2008, an accelerator improvement project was initiated to install BERGOZ BPM-MX processors close to all sextupoles.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 919410
• Report Number(s): SLAC-PUB-12974
• Conference Information: Journal Name: Conf.Proc.C070625:4261,2007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
ACCPHY
DESIGN
DETECTION
OPTICS
POSITRON BEAMS
REPAIR