Speaker
Mr
Vladimir Batkin
(Budker INP SB RAS)
Description
GOL-NB facility [1] is now developing for investigation of confinement of plasma with moderate turbulence in multi-mirror magnetic trap. Neutral injection is considered in this project as a main mean of heating plasma. The report presents status of GOL-NB team working on neutral injectors. In developing these injectors it was took into account experience of application neutral beam in GOL-3 installation [2] and data of modeling the result of applying modern injectors in this facility [3]. The main difference GOL-NB from GOL-3 is volume central cell of magnetic trap and improved evacuation, which must reduce charge exchange losses of fast particles.
Two injectors with beam focus distance 1.6 m initially destined for GOL-3 were applicable for the central cell of GOL-NB without significant modernization. Design parameters of these injectors are next. Energy of atomic beam is 25 keV, power – 2∙0.75 MW, time duration – 5 ms. Injectors structure is based on main units (arc ion source, beam forming multi-aperture structure with geometric focusing) previously tested in products placed on the number of facilities. The main attention was paid to the optimization of power and control injectors in relation to the experimental conditions on GOL3-NB facility. Technical launch of injectors held, now produced their debugging.
Injector power system includes the source of accelerating voltage, block of high-potential equipment, block of low-voltage equipment and control system. High-voltage equipment is mounted separately for each injector; low-voltage equipment is integrated. The source of accelerating voltage (AV) is made of full-featured modular sources of 1 kV voltage with interchange at full voltage 25 kV in the power and control circuits. Amplitude and front of voltage pulse is provided by appropriate modules switching. AV Controller implements the function of system restart after the electrical breakdown. Arc discharge power unit uses chopper circuit to form pulse of stabilizes current with up to 1 kA amplitude. Discharge ignition is performed by interrupting the current in the connected in parallel to the discharge gap resistive load. Injectors are managed by using a dedicated server. One can use any connected to the information network workstation to control periodic or single injection event.
[1] V.V. Postupaev, A.V. Burdakov, A.A. Ivanov // Fusion Science and Technology, vol. 68, No.1, 2015, pp. 92-98.
[2] V.T. Astrelin, V.I. Batkin, A.V. Burdakov, et al., Abstracts of XXXV International (Zvenigorod) Conference on Plasma Physics and Controlled Fusion, Zvenigorod, 2008, p.35.
[3] V.I. Batkin, V.B. Bobylev, A.V. Burdakov, et al., Fusion Science and Technology, V.59, No 1T, 2011, p.262-264.
Primary author
Mr
Vladimir Batkin
(Budker INP SB RAS)
Co-authors
Prof.
Aleksandr Burdakov
(Budker INP SB RAS)
Ms
Elfrida Bambutsa
(Budker INP SB RAS)
Mr
Marat Gafarov
(Budker INP SB RAS)
Mr
Renat Voskoboynikov
(Budker INP SB RAS)
Dr
Vladimir Burmasov
(Budker INP SB RAS; Novosibirsk State University)
