Abstract
TOTal Elastic and diffractive cross section Measurement (TOTEM) is an experiment at the CERN Large Hadron Collider (LHC) to measure the total pp cross section and elastic scattering of protons. For the detection of the elastically scattered particles at very small angles with respect to the beams edgeless silicon detectors will be contained in 36 small vacuum vessels called “roman pots” to be installed inside the LHC beam vacuum pipe. This chapter reviews different cooling methods and investigates their practicality for the LHC collider environment. Compared to the rather complex forced flow systems the proposed design mainly applies passive elements for heat extraction and transport with heat pipes and a pulse tube refrigerator. It seems to be particularly suited for the LHC tunnel hostile environment. To allow the operation of the TOTEM cooling system at different temperature ranges a design feature permits to empty and change the working fluid for adaptation. This is done with valves installed at the pipe appendix after the condenser allowing the evacuation of the fluid and the refill with a different one. A prototype will be constructed for tests at the CERN SPS accelerator.
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