Abstract
The extravagant waste of expensive liquid helium into the air and the frequent need of liquid helium transfer have been the two major factors to prevent wide spread usage of MEG (Magnetoencephalography). So, we have developed an efficient cooling system to collect evaporated helium gas, cool it down to liquid and return it into a dewar using a small cryocooler without making any disturbing noise to the MEG.The key idea is not to use liquid helium directly to keep the dewar cooled down, but to utilize relatively high temperature helium gas (about 40K) cooled by the first stage of the cryocooler to get rid of invading heat to the dewar. The gas is fed at the neck tube of the dewar. The evaporated helium gas in the dewar is collected swiftly while it is in the low temperature and is returned to liquid without using much energy. A very special transfer tube that passes the liquid helium, the low temperature helium gas (about 5K) and the relatively high temperature helium gas (about 40K) has been developed to ...
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
