Visible Bremsstrahlung measurements on TEXTOR for the determination of Z(eff) under different discharge and heating conditions
Applying ICRH on a NB heated plasma (deuterium beam in deuterium plasma) on TEXTOR leads to significant increases of the neutron yield, which may reach 80% when the auxiliary heating powers P(RF) and P(NI) are equal. The increase in the neutron emission comes partly from the increase in the electron and ion temperature and from the change in density of the target plasma but a residual contribution remains unexplained. Direct acceleration of ions of the beam by RF fields could be responsible for this augmentation. The experimental set-up is described. The original calibration procedure used is based on the neutron estimation at the switch on of the neutral injection. This calibration has the advantage of being dependent on well known plasma parameters. The neutron yield is measured during combined co-injection of deuterium and ICRH. The increase in neutron production due to direct acceleration of the ions of the beam by the RF field is estimated using a simple model.
Bibliographic Reference: Paper presented: 17th European Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN 35804 ORA
Record Number: 199011633 / Last updated on: 1994-12-02
Original language: en
Available languages: en