Photon stimulated desorption from a vacuum chamber at the National Synchrotron Light Source

Kobari, Toshiaki; Halama, H. J.

doi:10.1116/1.574451

Cited by 26 publications

(7 citation statements)

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“…This pollution arises from photochemical reactions of the background gases with the beam. The main gases emitted while irradiating an ultrahighvacuum chamber with a white beam are H 2 , CH 4 , CO and CO 2 (Kobari & Halama, 1987). These species could adsorb on the first mirrors M1 and M2, inducing a carbon deposit that would impair reflectivity over time.…”

Section: Consideration Of Possible Contamination Of the First Mirrorsmentioning

confidence: 99%

DISCO: a low-energy multipurpose beamline at synchrotron SOLEIL

et al. 2009

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DISCO, a novel low-energy beamline covering the spectrum range from the VUV to the visible, has received its first photons at the French synchrotron SOLEIL. In this article the DISCO design and concept of three experimental stations serving research communities in biology and chemistry are described. Emphasis has been put on high flux generation and preservation of polarization at variable energy resolutions. The three experiments include a completely new approach for microscopy and atmospheric pressure experiments as well as a ;classical' synchrotron radiation circular dichroism station. Preliminary tests of the optical design and technical concept have been made. Theoretical predictions of the beam have been compared with the first images produced by the first photons originating from the large-aperture bending-magnet source. Results are also reported concerning the cold finger used to absorb hard X-ray radiation in the central part of the synchrotron beam and to avoid heavy thermal load on the following optics. Wavelength selection using monochromators with different gratings for each experimental set-up as well as beam propagation and conditioning throughout the optical system are detailed. First photons comply very well with the theoretical calculations.

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Section: Consideration Of Possible Contamination Of the First Mirrorsmentioning

confidence: 99%

DISCO: a low-energy multipurpose beamline at synchrotron SOLEIL

et al. 2009

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“…3) After a week of pumping to a. pressure -1 x 10~9 Torr, the water peak in an unbaked stainless cube is desorbed within -10 23 photons nf 1 . In a storage ring this is likely to take longer due to reflected photons, but an in-situ bake out may not be required.…”

Section: Desorption Coefficients -U10 Beam Linementioning

confidence: 99%

NSLS vacuum system operating experience conditioning and desorption yields

Halama

1991

AIP Conference Proceedings

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All straight sections in both the VUV and the X-Ray rings have been filled with various insertion devices, most of them fully operational. Beam Ufa tine in the VUV ring is limited by the Touschek effect to -100 minutes at 800 mA due to the small vertical beam size required by users. With no experiments running, X-Ray beam lifetime is >35 hours at 220 mA and is limited by beam gas scattering. During the past several years the U10 beam line was used to measure PSD yields from various metals to study their relative merits for light sources. These yields were also compared to those measured in X-Ray ring dipoles during initial commissioning when desorption was high.Despite the large differences in critical photon energies, agreement was quite good. Both rings are now fully conditioned and their pressures and lifetimes have reached equilibrium. Well established conditioning procedures are followed after every intervention into their vacuum systems.

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“…Sea Ref. 2, Fig. 8, where it is shown that photon stimulated outgassing is primarily induced by the photo electrons.…”

Section: Couihatosmentioning

confidence: 99%

“…Three runs (2,5,8) were made with the TSP active and with a shield to keep titanium well away from the absorber.…”

Section: Molecular Desorption Yieldsmentioning

confidence: 99%

Measurements of a prototype synchrotron radiation pumped absorber for future light sources

Chou¹,

Foerster²,

Halama³

et al. 1988

AIP Conference Proceedings

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In the new generation of advanced synchrotron light sources, the conventional concept of distributed pumping is no longer suitable for removing the gas load caused by photon stimulated dssorption (PSD). A new concept using a combination of photon absorber and pumping station has been designed, constructed, and installed in the U10B beam line at the VUV ring of the National Synchrotron Light Source. The system consists of an electrically insulated water cooled copper block, a titanium sublimation pump, calibrated BA gauges, a calibrated RGA, and a known conductance. A photon beam 10 milliradian wide and 3.26 milliradian high, hsving critical energy of 500 eV, is directed on the absorber. PSD yield is studied as a function of total beam dose and absorber ;'• surface preparation. The results frost-this experiment, pumpcharacteristics, design of an absorber''pump for future light • sources, and the pressure improvement factors will be presented.

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Photon stimulated desorption from a vacuum chamber at the National Synchrotron Light Source

Cited by 26 publications

References 0 publications

DISCO: a low-energy multipurpose beamline at synchrotron SOLEIL

DISCO: a low-energy multipurpose beamline at synchrotron SOLEIL

NSLS vacuum system operating experience conditioning and desorption yields

Measurements of a prototype synchrotron radiation pumped absorber for future light sources

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