Abstract
Two stainless-steel vacuum chambers, after putting them through a usual laboratory ultrahigh vacuum processing, have been exposed to a white synchrotron radiation photon beam, 3.75 keV critical energy at DCI. However, no “in-situ” bake out was performed on the vessels before the irradiation. The first test chamber was a simple 130 mm diameter circular tube 3.6 m in length. Beam scrubbing for a photon dose of 2.3×10 23 photons m −1 was found to decrease the molecular yields to below 10 −5 molecule per photon for the main relevant gas species CO and CO 2. Wall pumping speeds developed by irradiation for these gas species have been measured. The second test chamber, a prototype vacuum vessel for the quadrupole section of the future synchrotron radiation source SOLEIL, was irradiated in a similar situation. The results of this test, which are close to the real conditions of a ring vacuum chamber, are compared to those obtained on the first test chamber.
Published Version
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