Helium resource is finite and decreasing rapidly now days. Helium users face periodic helium shortages as well as high and continuously increased helium prices. Liquid helium free (dry) or zero boil off (ZBO) systems, such as SQUIDs system, DR, ADR, SC magnet and STM, etc., become more and more popular. This talk will introduce key technologies using for these cryogenic systems, which include:
1. Background Introduction: helium resource and liquid helium solutions with 4 K cryocoolers.
2. Working principle of GM and pulse tube cryocoolers.
3. GM and pulse tube cryocoolers operating below 4 K.
4. Compact 2 K cryocooler development
5. Enable technologies for cryocooler integration: vibration and vibration damping; temperature oscillation and temperature damping, magnetic distortion and free intermediate precooling at 4-20K from pulse tube cryocooler.
6. Examples of some systems in the low temperature range of 0.01 K to 4K.
Dr. Wang received his Ph.D. degree from Xian’An Jiaotong University in 1993. Between 1993 and 1996, he was a post-doctoral researcher and later became an associate professor at Cryogenic Lab, CAS. He then received an A.v. Humboldt research fellowship for study at the University of Giessen, Germany. Since 1998, he has been employed as Director of R&D and Chief Scientist at Cryomech, Inc. He is currently a board director of Cryomech, Inc. He was elected as a Board of Director of International Cryocooler Conference. He was awarded Cryogenic Prize from Elsevier Science Ltd for the best paper published in cryogenics (1998) and Roger W. Boom Award for 2000 from Cryogenic Society of America. He was honored as Guest Professor of Shanghai Jiaotong University.
He developed and commercialized the world’s first 4 K two-stage pulse tube cryocoolers as well as some pioneering cryogenic systems, which have been widely used in many fields around world. He also collaborates with many laboratories worldwide to develop the advanced cryogenic solutions. He has published more than 90 scientific papers.
Host: Canhua Liu canhua.liu@sjtu.edu.cn