New X-ray BPM data acquisition system for the APS

Lenkszus, F.; Laird, R.; Decker, G.; Singh, Om V.; Hahne, Michael; Erwin, L.

doi:10.1109/pac.2001.987496

Cited by 2 publications

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“…As a result of an upgrade to the X-BPM data acquisition and processing electronics in May 2001, these units provide clean, anti-aliased signals for inclusion in orbit control algorithms [4,5]. Each beamline has two XBPMs in the front-end area, located 11 and 18 m, respectively, downstream of the source point for bending magnet beamlines, and 16 and 20 m for the two ID XBPMs.…”

Section: Beam Stabilitymentioning

confidence: 99%

Strategy for achieving true sub-micron orbit stabilization at the Advanced Photon Source

Decker

Singh²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The Advanced Photon Source was commissioned in March 1995 to provide high-brightness ultrastable x-ray photon beams to its user community. The original beam stability specifications were that the source points not move more than 4.5 microns rms vertically and 17 microns rms horizontally. Reductions in coupling, together with planned reductions in emittance and increasing beamline user sophistication, are pushing the envelope of presently achievable beam stabilization methods. While beam stability below the 2-micron rms level is achieved routinely in the band from .016 Hz to 30 Hz in both the vertical and horizontal planes, much remains to be done to reduce this level below 1 micron rms. An additional challenge is to maintain the beam stability for longer time periods, i.e., days to weeks. This paper discusses progress to date on these issues and suggests methodologies for further improvements.

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Section: Beam Stabilitymentioning

confidence: 99%

Strategy for achieving true sub-micron orbit stabilization at the Advanced Photon Source

Decker

Singh²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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“…With the new data acquisition and control hardware [2,3], XBPM-based orbit control is now possible and commissioning is in progress. Several bending magnet (BM) beamlines are now routinely employing XBPMbased orbit feedback, with others to be completed by the end of calender year 2001.…”

Section: Introductionmentioning

confidence: 99%

Operational experience with X-ray beam position monitors at the Advanced Photon Source

Singht

Decker²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Photoemission-based x-ray beam position monitors (XBPMs) have been employed in each of the bending magnet (BM) as well as insertion device (ID) beamline front-ends in the Advanced Photon Source storage ring. The position data derived from the BM XBPM blades have been achieved at the few-micron rms level. Insertion device XBPM-based position data have historically been plagued with problems resulting from background stray radiation impinging on the blades. A method that involves introducing chicanes into the lattice at both sides of the ID was proposed and implemented in APS sector 34 in December 1998, resulting in the elimination of most of the unwanted radiation. The effects of the remaining background radiation were further reduced by a background subtraction procedure.New DSP-based data acquisition and control hardware has been installed that allows the smooth integration of XBPM data with the existing storage ring rf-BPM system. XBPM-based orbit feedback, for a fixed ID gap, has resulted in vertical pointing stability of 0.2 µrad rms over a 24-h time period. Because of these good results, chicanes have been introduced for six more beamlines and several more are planned in the future. Operational experience with these beamlines is presented and progress on methodologies for reducing gap-dependent orbit motions is discussed.

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New X-ray BPM data acquisition system for the APS

Cited by 2 publications

References 2 publications

Strategy for achieving true sub-micron orbit stabilization at the Advanced Photon Source

Strategy for achieving true sub-micron orbit stabilization at the Advanced Photon Source

Operational experience with X-ray beam position monitors at the Advanced Photon Source

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