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최연석(Y.S. Choi),김명수(M.S. Kim),김동락(D.L. Kim),복민갑(M.G. Bok),전종수(J.S. Jeon),이종현(J.H. Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The natural circulation loop is designed for cryogenic insert in the Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer. Sensitivity is the key parameter of a FT-ICR mass spectrometer and the cryo-cooling of preamplifier can reduce the thermal noise level and thereby improve the signal-to-noise ratio. The preamplifier consisted of non-magnetic materials is thermally connected to the cooling loop which is passing through the flange maintaining ultra-high vacuum in the ion trap. The cryogenic liquid passes through inside of the loop in order to cool the preamplifier indirectly. At the other end, a two-stage cryocooler is located to recondense cryogenic vapor generated due to the heat from the preamplifier. The vapor is condensed and flows back to the preamplifier through the loop. The circulating cryo-fluid removes heat from the preamplifier or heat source and transports it to the cryocooler or heat sink. In this paper, the natural circulation loop for cryogenic preamplifier is introduced and the detail of design is presented for improving the sensitivity of detector.