NDLI: Global DC closed orbit correction experiments on the NSLS X-ray ring and SPEAR

Content Provider	IEEE Xplore Digital Library
Author	Chung, Y. Decker, G. Evans Jr., K. Safranek, J. So, I. Tang, Y. Corbett, W.J. Hettel, R.
Copyright Year	1993
Description	Author affiliation: Argonne Nat. Lab., IL, USA (Chung, Y.; Decker, G.; Evans, K., Jr.)
Abstract	The global closed orbit correction experiments conducted an the NSLS X-ray ring and the SPEAR using the technique of singular value decomposition (SVD) are presented. The beam response matrix, defined as beam motion at beam position monitor (BPM) locations per unit kick by corrector magnets, was measured and then analyzed using SVD. The BPMs and correctors are reconfigured into "transformed" BPMs (t-BPMs) and "transformed" correctors (t-correctors), with each t-BPM coupled to at most one t-corrector and vice versa for orbit correction. The decoupled t-BPMs are used to estimate the limit on orbit correction, while the decoupled t-correctors are used to optimize the corrector strengths. As a result, the vertical r.m.s. orbit error at the BPM locations was reduced from 208 /spl mu/m to 61 /spl mu/m about an arbitrary reference orbit in the NSLS X-ray ring. In SPEAR, the vertical closed orbit was brought to the BPM centers at the selected BPM locations with an r.m.s. error of 215 /spl mu/m reduced from the initial 780 /spl mu/m.
Starting Page	2275
Ending Page	2277
File Size	285710
Page Count	3
File Format	PDF
ISBN	0780312031
DOI	10.1109/PAC.1993.309293
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-05-17
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Particle beams Feedback Laboratories Matrix decomposition Singular value decomposition Monitoring Extraterrestrial measurements Synchrotrons Light sources Storage rings
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Global DC Closed Orbit Correction Experiments on the NSLS X-Ray Ring and SPEAR

Global DC Closed Orbit Correction Experiments on the NSLS X-ray Ring and SPEAR*

Closed orbit correction using singular value decomposition of the response matrix

Global DC Closed Orbit Correction Experiments on the NSLS X-ray Ring and SPEAR* (1993)

Automatic steering of X-ray beams from NSLS insertion devices using closed orbit feedback

Global COD correction of SAGA-LS storage ring

Orbit stability improvement at the NSLS X-ray ring

Electron beam stability and beam peak to peak motion data for NSLS X-ray storage ring

Global DC closed orbit correction experiments on the NSLS X-ray ring and SPEAR

Global DC closed orbit correction experiments on the NSLS X-ray ring and SPEAR

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