JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Aumüller, S. AU - Blaum, K. AU - Bozyk, L.H.J. AU - Spiller, P.J. ED - Herfurth, Frank ED - Schaa, Volker RW TI - Prototype Room Temperature Quadrupole Chamber with Cryogenic Installations J2 - Proc. of HIAT2022, Darmstadt, Germany, 27 June-01 July 2022 CY - Darmstadt, Germany T2 - International Conference on Heavy Ion Accelerator Technology T3 - 15 LA - english AB - The synchrotron SIS100 at FAIR accelerator complex at the GSI Helmholtzzentrum will generate heavy ion beams of ultimate intensities. As medium charge states have to be used, the probability for charge exchange in collisions with residual gas particles of such ions is much lager than for higher charge states. In the last years, several measures have lowered the residual gas density to extreme high vacuum conditions. For example 55% of the circumference of SIS18 have already been coated with NEG, which provides high and distributed pumping speed. Nevertheless, this coating does not pump nobel and nobel-like components, which have very high ionization cross sections. A cryogenic environment at e.g. 50-80K provides a high pumping speed for all heavy residual gas particles. The only typical residual gas particle that cannot be pumped at this temperature is hydrogen. With the pumping speed of an additional NEG coating in these areas, the pumping will be optimized for all residual gas particles. The installation of cryogenic installations in the existing room temperature synchrotron SIS18 at GSI has been investigated. Measurements on a prototype chamber and simulations of SIS18 with cryogenic installations based on these measurements are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 75 EP - 78 KW - cryogenics KW - quadrupole KW - vacuum KW - simulation KW - synchrotron DA - 2022/08 PY - 2022 SN - 2673-5547 SN - 978-3-95450-240-0 DO - doi:10.18429/JACoW-HIAT2022-TUP05 UR - https://jacow.org/hiat2022/papers/tup05.pdf ER -