A neon-charged CLHP integrated with a G-M cryocooler was designed and investigated. The CLHP can realize the supercritical startup with an auxiliary heat load of 1.5 W. Maximum heat transport capability of the CLHP was 4.5 W over a distance of 0.6 m. There existed an optimum auxiliary heat load to expedite the supercritical startup. There existed an optimum charged pressure to reach the largest heat transfer limit.