Conveners
C1PoD - Pumps, Compressors and Expanders
- Rich Dausman (Cryomech, Inc.)
- Sonny Yi (The Aerospace Corporation)
Gas bearings are an appealing technology which is widely used in turbo-machine in large cryogenic systems due to its inherent characteristic of oil-free and high-speed capability. The hydrodynamic gas bearings are more effective to cryogenic system but less load capacity and dynamic stability by compared with externally pressurized gas bearings. Etching some grooves on shaft or bearing is...
The twin screw compressor unit has become more and more popular than other types compressor units in large helium cryogenic system. And the new application with helium as the working medium for the screw compressor unit has some technologies to be refreshed for adapting the large helium cryogenic system. The technologies refer to the rotor profiles, oil-injection parameters, oil separation...
The Cold Compressor (CC) is used to lower the saturation temperature of liquid helium (LHe) in varying heat load condition from the application side i.e. Superconducting Magnet and Cryopumps for large tokamak machine. The CC is a key component of typical cold box, attached to the LHe bath, compresses and transfers the vapor generated during the heat exchange via Heat Exchangers as well as the...
Fusion reactors are generating energy by nuclear fusion between deuterium and tritium. In order to evacuate the high gas throughputs from the plasma exhaust, large pumping speed systems are required. Within the European Fusion Programme, the Karlsruhe Institute of Technology (KIT) has taken the lead to design a three-stage cryogenic pump, featuring an 80 K thermal radiation shield, and two...
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) has built and commissioned an independent Cryogenic Test Facility (CTF) in support of testing in the Radio-frequency Test Facility (RFTF). Superconducting Radio-frequency Cavity (SRF) testing was initially conducted with the CTF cold box at 4.5 K. A Kinney vacuum pump skid consisting of a roots blower with a liquid...
Introduction of application and characteristics of active magnetic bearing for helium centrifugal cold compressor is present. With the analysis and simulation of control system, a final solution of the magnetic bearing structure is obtained through entire scheme of AMB design and parameter selection for a cold compressor with helium mass flow 30g/s, which is now being developed at TIPC, CAS....
Recently a prototype of 4.5K helium refrigerator with capacity of 250W cooling power is under developing in Technical Institute of Physics and Chemistry (TIPC), CAS China. The helium refrigerator is a modified Claude cycle refrigerator, two helium turbo expanders were dedicatedly designed and fabricated to meet the requirements of Claude cycle helium refrigerator. Reliable static gas bearings...
It is an important factor the resonance between the compressive piston and expansive piston that influence the performance of stirling cooler. Moreover, the seal clearance between the displacer and expansive shell influences the resonance characteristic of displacer. There may be contact and friction between the displacer and expansive shell because of their slight seal clearance. It could...
