use of NEG Pumps and Coatings in Large Vacuum Systems - CERN ...
use of NEG Pumps and Coatings in Large Vacuum Systems - CERN ...
use of NEG Pumps and Coatings in Large Vacuum Systems - CERN ...
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CAS May 17-23, 2006<br />
<strong>NEG</strong> coat<strong>in</strong>gs & Photon Induced Desorption (see N.Hilleret’s lecture):<br />
Are these coat<strong>in</strong>gs suitable for the <strong>use</strong> <strong>in</strong> a particle accelertor?<br />
“Variation <strong>of</strong> the effective molecular<br />
desorption yield as a function <strong>of</strong> the<br />
beam <strong>and</strong> photon dose measured on<br />
a TiZrV coated sta<strong>in</strong>less steel<br />
chamber <strong>in</strong>stalled on a beaml<strong>in</strong>e at<br />
ESRF Grenoble.<br />
The getter coat<strong>in</strong>g activation (250 °C<br />
for 20 h) is accompanied by a sharp<br />
decrease <strong>of</strong> the desorption yield<br />
(about a factor 380), due to both<br />
surface clean<strong>in</strong>g <strong>and</strong> pump<strong>in</strong>g.”<br />
C.Benvenuti et al., EVC-6, 1999<br />
F. Mazzol<strong>in</strong>i – The <strong>use</strong> <strong>of</strong> <strong>NEG</strong> <strong>Pumps</strong> <strong>and</strong> <strong>Coat<strong>in</strong>gs</strong> <strong>in</strong> <strong>Large</strong> <strong>Vacuum</strong> <strong>Systems</strong>: Experience <strong>and</strong> limitations
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