Experimental studies of cryocooler based cryopump with indigenous activated carbon cryopanels

A Cryosorption pump is the only possible pump that can be used to pump helium and hydrogen isotopes in fusion devices, in our attempt to develop cryosorption pumps and to benchmark the performances of indigenous activated carbon based cryopanels, we have experimentally evaluated the performances of the indigenous activated catbon panels in comparison with that of the commercial one used in CTi Cryosorption pump (model Cryotorr 7). The panels are mounted at the second stage cold head of the GM cryocooler, which reaches 11K, with the first stage reaching ∼ 50 K. With no gas influx, an ultimate pressure of 2.3E-7 mbar is reached. The pumping speeds of different gases such as nitrogen, argon, hydrogen and helium have been studied both for the commercial o and indigenous charcoal based cryopanels. These studies serve as guidelines for benchmarking the indigenous activated carbon based cryopanels towards their performance improvements.