Synchrotron light source measurements of photon stimulated desorption from vacuum chamber Materials

Foerster, C. L.

doi:10.1080/08940889808260954

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…It can be seen that, as already known from published literature [6], the Al chambers are characterized by higher SR-induced gas loads when compared to the SS ones. It should be noted that the dP/dI values shown here are not measured directly on the ID chambers, but rather on the pumping ports placed immediately upstream and/or downstream of them.…”

Section: Comparisonsupporting

confidence: 72%

Comparison of ESRF and Elettra vacuum evolution, troubleshooting and success

Kersevan

Miertusova²

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

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A comparison of the performance of some key components of the vacuum systems of the third generation synchrotron radiation (SR) light sources ESRF and Elettra is made. It is shown that, following routine vacuum interventions, both accelerators reach suitably high gas-scattering beam lifetimes in a matter of few tens of ampere·hours of integrated beam doses. The impact of the installation of narrow-gap vacuum chambers is discussed. Some failures and their impact on the operation of the accelerators are described in detail.

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Section: Comparisonsupporting

confidence: 72%

Comparison of ESRF and Elettra vacuum evolution, troubleshooting and success

Kersevan

Miertusova²

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

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“…In the second scenario we used a reduced current of 10mA and a wider gap to calculate the photon flux (green curve in figure 2). The photon dose related development of the photo desorption yield can be written [3] as:…”

Section: Photo Desorption and Gas Loadmentioning

confidence: 99%

“…The value of α was estimated as -0.5 from ref. [3]. This approach does not account for the difference between our copper alloy (Glidcop ® )system and the referenced stainless steel data.…”

Section: Photo Desorption and Gas Loadmentioning

confidence: 99%

Simulations of the pressure profiles of the PETRAIII frontends

Amann

Uhahn

Hesse

et al. 2008

J. Phys.: Conf. Ser.

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PETRA III will be a high brilliance third generation synchrotron radiation source [1]. The undulators will provide photon beams with small beam size and therefore the components in the frontend are as compact as feasible. The resulting narrow cross sections of the vacuum system will yield a small conductance in the whole beamline. The design of the frontends has reached an advanced state so that the initial design of the vacuum system can be finalized now. The vacuum specification of the beamline components [2] demands for a hydrocarbon and dust free vacuum systems. To provide this, the beamline will be initially pumped down with dry pumping stations [9] to a pressure of at least 10 -6 mbar. At this pressure a set of ion pumps will be switched on to pump the beamline continuously. For lifetime reasons of the ion pumps it is necessary that during operation the pressure in the pumps is below 10 -6 mbar. During the start up of the beamline system a high amount of gas will be photo desorbed especially at the high power slit systems. To cope with this, the pumping concept of the beamline has been revised. Monte Carlo simulations of the pressure profiles in the beamline show that additional pumping near the slit systems is mandatory for a long lifetime of the ionpumps. The paper reports the layout process of the pumping system.

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