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Persistent URL http://purl.org/net/epubs/work/53254
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Record Id 53254
Title Ion induced pressure instability in the ILC positron DR
Abstract Ion induced pressure in stability is a potential problem for the ILC positron damping ring (DR)if the chosen pumping scheme does not provide sufficient pumping. The ion induced pressure instability effect results from ionisation of residual gas molecules by the beam particles, their acceleration in the field of the beam towards the vacuum chamber walls, causing ion induced gas desorption from vacuum chamber walls; these gas molecules in their turn can also be ionised, accelerated and cause further gas desorption. If the pumping is insufficient, this effect may cause a pressure instability, in which the pressure in the beam chamber grows rapidly to an unacceptable level. To analyse the ion in­duced pressure in stability in the ILC positron DR the energy gained by ions was calculated for the appropriate beam parameters; it was found that the energy gain of ions will be about 300 eV. The ion induced gas desorption was esti­mated, and pumping solutions to avoid the ion induced pressure in stability are suggested. The cheapest and most ef­ficient solution is to use NEG coated vacuum chamber.
Organisation ASTeC , ASTeC-VS , CI , ILC , STFC
Keywords Physics , Linear Collider , pressure instability , vacuum
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Language English (EN)
Type Details URI(s) Local file(s) Year
Paper In Conference Proceedings In 1st International Particle Accelerator Conference (IPAC10), Kyoto, Japan, 23-28 May 2010, (2010): 3566-3568. http://accelconf.…0/papers/wepe093.pdf 2010