Noise reduction efforts for the ALS infrared beamlines

Scarvie, T.; Andresen, Nord; Baptiste, K.; Byrd, J.; Chin, M.; Martin, Michael; McKinney, Wayne R.; Steier, C.

doi:10.1016/j.infrared.2004.01.009

Cited by 16 publications

(9 citation statements)

References 6 publications

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“…5 The feedback system reduces the effects of the top-off mode injections and is particularly good at correcting the longer decay (~20 ms) of the electron beam back to the normal orbit. The feedback system, however, is not fast enough (rolloff at ~1 kHz) to correct for the initial transient of the injection event.…”

Section: Resultsmentioning

confidence: 99%

Reconciling FTIR Spectroscopy with Top-off Operations at the Advanced Light Source

Vernoud¹,

Bechtel²,

Borondics³

et al. 2010

AIP Conference Proceedings

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Abstract. Top-off operations is a quasi-continuous injection mode that increases the flux and brightness of a synchrotron source and improves thermal stability of optical components by maintaining a constant current in the storage ring. Although the increased and constant flux is advantageous for FTIR measurements, the frequent injections (about one every 30 seconds in the ALS case) introduce artifacts into the spectrum by creating spikes in the interferogram data. These spikes are caused by brief beam motion during the injection event. Here, we describe our efforts to minimize the effects of top-off generated interferogram spikes on several FTIR spectrometers. They include using a fast feedback mirror system to correct for beam motion and a gating signal to inhibit interferogram collection during a top-off injection.

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Section: Resultsmentioning

confidence: 99%

Reconciling FTIR Spectroscopy with Top-off Operations at the Advanced Light Source

Vernoud¹,

Bechtel²,

Borondics³

et al. 2010

AIP Conference Proceedings

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show abstract

“…It ensures a collimated beam and steers the beam downward at an angle of 90 degrees through the high vacuum beampipe. A set of active feedback systems developed at ALS is installed after toroidal mirror T2 [16]. It is used to reduce the infrared beam motion and correct for several noise sources in the far-infrared region.…”

Section: The Beamline Opticsmentioning

confidence: 99%

The status of the first infrared beamline at Shanghai Synchrotron Radiation Facility

Tong

Zhu

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…While early synchrotron sources had beam stability issues, the high electron beam stability of modern third-generation machines and/or the use of optical beam stabilizing techniques [25] provide the required beam stability for high-quality FTIR spectroscopy.…”

Section: [ ( F I G U R E _ 3 ) T D $ F I G ]mentioning

confidence: 99%