Flight-type-probe for measuring hot core plasmas

Uehara, Kazuya; Sadamoto, Yoshiro*; Amemiya, Hiroshi*; Oyama, Koichiro*; Nagashima, Yoshihiko*

no journal, , 

In the hot and dense fusion plasma, the application of the electrostatic and/or magnetic probe is limited to such a localized region as the scrape off layer (SOL), since the conventional probe would be destroyed in the core plasma region due to the great heat damage and/or the electromagnetic force during the plasma disruption. In order to make the best use of probe methods having a high spatial and time resolution, we consider a flight-type-probe (FTP), in which the probe circuit and memory elements for the signal are installed in a capsule to be thrown into the core hot plasma from one side port with a very fast speed. The data acquired are transmitted through rf antenna to outside observers and/or are saved in the CPU memory elements to be analyzed after reproduction. The dimension of the FTP is designed as small as possible and the launching mechanism is used for a pellet injection or a rail gun. The preliminary design of the FTP is inspected in this issue.