Thermal model and associated novel approach for synchrotron radiation liner with end cooling

An end conductive cooling approach has been developed to reduce the radial space budget of a synchrotron radiation liner to permit the maximum possible liner tube inner diameter (1D). A thermal model has also been developed to analyze the thermal performance of such liners. This approach is found to be acceptable for a liner in a 5 m long quadrupole magnet and 3 m long spool piece, but not for a longer 15 m dipole. The heat transfer and temperature distribution were calculated respectively along the axis of two different liner model: 20 K and 80 K liner with different thicknesses (0.5-2 mm) of liner tubes and different emissivities (0.05-0.3) of liner surface for a variety of magnets. The thermal model is also applied to the case of an 80 K liner connected directly to a 4 K beam position monitor (BPM). In order to utilize the end cooling, a good thermal joint and a compact heat exchanger are designed