Status of the top-off upgrade of the ALS

Steier, C.; Bailey, B.; Baptiste, K.; Barry, W.; Biocca, A.; Byrne, W.; Chin, Michael; Donahue, R.; Duarte, Robert; Fahmie, M.; Gath, B.; Jacobson, S.; Julian, J.; Jung, Jin‐Young; Kwiatkowski, S.; Marks, S.; Mueller, R.; Nishimura, Hiroshi; O'Neill, J.; Prestemon, S.; Robin, D.; Rossi, S.; Sannibale, F.; Scarvie, T.; Schlueter, R.; Shuman, D.; Stover, G.; Timossi, C.; Warwick, Tony; Weber, J.; Williams, E.

doi:10.1109/pac.2007.4441028

Cited by 3 publications

(2 citation statements)

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“…Synchrotrons have traditionally operated in decay mode, in which the storage ring is filled to a specified current and then allowed to decay to nominally half the original value before refilling, typically 2-3 times or more per day. In recent years, most synchrotron facilities have been upgrading to "top-off" or "top-up" operations, [26] a mode where electrons are quasi-continuously injected into the storage ring to maintain a constant current. This mode of operation has obvious advantages over decay operation in terms of increased flux, constant brightness, thermal stability, and uninterrupted light.…”

Section: Synchrotron Infrared Radiation: Broadband Bright and Spatially Coherentmentioning

confidence: 99%

Synchrotron infrared nano-spectroscopy and -imaging

Bechtel

Johnson

Khatib

et al. 2020

Surface Science Reports

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Infrared (IR) spectroscopy has evolved into a powerful analytical technique to probe molecular and lattice vibrations, low-energy electronic excitations and correlations, and related collective surface plasmon, phonon, or other polaritonic resonances. In combination with scanning probe microscopy, near-field infrared nano-spectroscopy and -imaging techniques have recently emerged as a frontier in imaging science, enabling the study of complex heterogeneous materials with simultaneous nanoscale spatial resolution and chemical and quantum state spectroscopic specificity. Here, we describe synchrotron infrared nano-spectroscopy (SINS), which takes advantage of the low-noise, broadband, high spectral irradiance, and coherence of synchrotron infrared radiation for near-field infrared measurements across the mid-to far-infrared with nanometer spatial resolution. This powerful combination provides a qualitatively new form of broadband spatio-spectral analysis of nanoscale, mesoscale, and surface phenomena that were previously difficult to study with IR techniques, or even any form of microspectroscopy in general. We review the development of SINS, describe its technical implementations, and highlight selected examples representative of the rapidly growing range of 2 applications in physics, chemistry, biology, materials science, geology, and atmospheric and space sciences.

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Section: Synchrotron Infrared Radiation: Broadband Bright and Spatially Coherentmentioning

confidence: 99%

Synchrotron infrared nano-spectroscopy and -imaging

Bechtel

Johnson

Khatib

et al. 2020

Surface Science Reports

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“…Radiation safety was the most important and most challenging area of the top-off upgrade [4]. The radiation dose rate of even one bunch of electrons propagating down a synchrotron light beamline could be dangerously high, therefore this case had to be excluded with absolute certainty.…”

Section: Radiation Safetymentioning

confidence: 99%

Successful Completion of the Top-off Upgrade of the Advanced Light Source

Steier¹,

Bailey²,

Baptiste³

et al. 2010

AIP Conference Proceedings

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Abstract.An upgrade of the Advanced Light Source to enable top-off operation has been completed during the last four years. The final work centered around radiation safety aspects, culminating in a systematic proof that top-off operation is equally safe as decaying beam operation. Commissioning and transition to full user operations happened in late 2008 and early 2009. Top-off operation at the ALS provides a very large increase in time-averaged brightness (by about a factor of 10) as well as improvements in beam stability. The following sections provide an overview of the radiation safety rationale, commissioning results, as well as experience in user operations.

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