IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Vacuum Science & Technology Monday Sessions
       Session VST-MoA

Paper VST-MoA7
Compact Trapping Device Integrated with a Throttle-Cycle Cooler Operating with Mixed Refrigerant

Monday, October 29, 2001, 4:00 pm, Room 125

Session: Dry, Cryo & Other Forms of Pumping
Presenter: M. Boiarski, IGC-APD Cryogenics Inc.
Authors: M. Boiarski, IGC-APD Cryogenics Inc.
A. Khatri, IGC-APD Cryogenics Inc.
S.B. Nesterov, Moscow Power Engineering Institute, Russia
A. Androsov, Moscow Power Engineering Institute, Russia
Correspondent: Click to Email
Trapping devices integrated with a throttle-cycle cooler operating with mixed refrigerant provide advantages in various applications. These devices can be efficient for water trapping at the inlet of turbo-molecular pumps and for oil trapping when used in combination with diffusion pumps. In addition, a mixed refrigerant cooler can provide predetermined temperature profiles of the trapping surface that can be used for selective trapping of desired substances. The refrigeration capacity and the power consumption of such coolers are discussed based on generalized experimental and theoretical data. Data on the refrigeration performance is presented for temperature ranges selected from 80 to 200 K for coolers operating with single-stage compressors. Experimental data is also presented for cooldown time. A rapid cooldown cooler can be designed with minor modifications of the existing low-cost coolers. Both the water pumping speed and nitrogen conductance are taken into account for the optimal design of the baffles. A comparative performance is given for the baffles of different configurations. The test particle Monte-Carlo method is used for simulation of gas flow in a high-vacuum system. A comparison of the calculated and experimental data was conducted for a water trap design consisting of parallel plates installed on the flattened cold finger. Experimental and calculated data on the nitrogen pumping speed are in good agreement. The deviation is less than 5%. This allows optimized configuration of the baffles using the software. Test data obtained for the water-trapping device integrated with turbo molecular pumps proves the performance to be reliable without a special temperature regulation system.