Search academic texts

Information × Registration Number 0220U102145, 0119U101343 , R & D reports Title Studies in the torsatron U-2M and U-3M of the structure of the plasma cord, MHD plasma activity and HF methods of creating and heating the plasma. popup.stage_title Head Moiseienko Volodymyr Ye., Registration Date 10-03-2020 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2 The study of ultra-short pulsed electron cyclotron resonance heating (ECCR) was proposed and started. The purpose of the ECRF's ultra-short pulses is to improve the cleaning of walls at Wendelstain-7ex (B-7ex). The proposal to clean the walls with hydrogen plasma is based on the production of atomic hydrogen in the plasma, which chemically interacts with impurities adsorbed on the surface of the chamber. At the beginning of the W1-X OP1.2b experimental campaign, successful discharges were performed according to the proposed scenario, using one and four ECCR start pulses using pre-ionization: - A single 3 msec ECR pulse generates a half-density plasma compared to a previous pulse that ended 0.9 s earlier; - there are indications that the plasma is not completely ionized (the behavior of optical lines, half the plasma density), and the generation of atomic hydrogen is expected; - the plasma decays fairly quickly. It is more a recombination than a diffusion. This allows for a high repetition rate (5 Hz); - H-alpha indicates bulk plasma during pulses; - The 4 pulse chain, which is accompanied by gas tightening, is successful. Such a circuit can be the basis for the ECRI wall conditioning scenario. The first experimental study of the operation of a dual-loop antenna similar to B-7ex was performed in the mode of creating a stellarator-type plasma Hurricane-2M (U-2M).   Product Description popup.authors GRECOV Dmitry L KOVTUN Yuriy V. KOZULYA Mykhaylo M. KOROVIN Valeriy B. KRASYUK Oleksandr Yu. KULIK Yulia S. LYSTOPAD Viktor M. LOZIN Oleksiy V. MAZNICHENKO Sergey M MOISEENKO Vladimir E. ROMANOV Vladislav S. SUSKO Evgeny V popup.nrat_date 2020-04-02 Close