Speaker
Mr
Yuriy Trunev
(Budker INP SB RAS)
Description
In Budker Institute of Nuclear Physics are studied the dynamics of tungsten erosion by pulsed electron beam with parameters of heat loads close to the ELM-type events in ITER. For these studies used a number of sophisticated optical measurements such as laser scattering, high-speed photography and so on, but one must also to clearly understand which part of the energy of the beam is absorbed in the target for each shot of the electron gun. Surprisingly, the issue of absorption of electron beam with such intense power density of 10 GW/m$^2$ and energy of 50-100 keV is not enough studied, in contrast to the "classical" measurement of absorption of electron beams in the matter, to determine their albedo and stopping power. It is connected both to the complexity of the formation of beams with such "exotic" parameters as well as difficult to take into account variety of processes on the target like: phase transitions of tungsten in the heating area, electrons interaction with plasma plume form target, the formation of droplets, etc.
This report presents an experimental and numerical study of the absorption of the electron beam with a heat power of 10 GW/m$^2$ on the tungsten target with linear dimensions of 30 mm for 70 mm and a thickness of 3 mm. Beam parameters were obtained by various diagnostics such as: the voltage in the diode, currents in the accelerator gap, on the Faraday cylinder and on the target. Also, X-ray power from the target was measured by a sensor based on BGO scintillator and photomultiplier. Calorimetric measurements of the tungsten sample were made by temperature sensor LM35, and temporal dynamics of surface temperature was fixed by infrared detector. Experimentally obtained heating of tungsten samples, were compared with a three dimensional calculations. Initial conditions of last one were taken from one-dimensional model taking into account all phase transitions in the area of beam absorption.
Primary author
Mr
Yuriy Trunev
(Budker INP SB RAS)
Co-authors
Prof.
Aleksandr Burdakov
(Budker INP SB RAS)
Dr
Aleksey Arakcheev
(Budker INP SB RAS)
Alexander Vasilyev
(Budker INP SB RAS, Novosibirsk State University)
Mr
Alexandr Kasatov
(Budker INP SB RAS)
Dr
Andrey Shoshin
(Budker INP SB RAS)
Dr
Dmitriy Skovorodin
(Budker INP SB RAS)
Mr
Igor Kandaurov
(Budker INP SB RAS)
Dr
Leonid Vyacheslavov
(Budker INP SB RAS)
Mr
Victor Kurkuchekov
(Budker INP SB RAS)
Mr
Vladimir Popov
(Budker INP SB RAS)
Peer reviewing
Paper
Paper files:
