TY - JOUR

T1 - Operation modes of hot-cathode plasma source for linear devices

AU - Akhmetov, Timur D.

AU - Davydenko, Vladimir I.

AU - Ivanov, Alexandr A.

AU - Shulzhenko, Grigory I.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Operation of a plasma source with a hot disk cathode and a cylindrical hollow anode in axial magnetic field is sensitive to the cathode-to-anode diameter ratio. When the cathode edge maps along magnetic field lines to the inner anode surface, the discharge voltage is relatively low, and the plasma stream with moderate density occupies the entire cross-section of the anode bore. By contrast, when the cathode projection is fully inside the anode bore with the radial cathode-to-anode gap ~ 1 cm, the discharge voltage jumps to much higher values exceeding 250 V. The plasma density profile becomes Gaussian-like with the width matching the cathode radius according to magnetic flux surfaces. The plasma density in the high-voltage cross-field discharge reaches 10 13 cm -3 , and the discharge parameters almost do not change with magnetic field up to 1.5 kG in the anode area. This plasma source is suitable for the use in linear devices for plasma-material interaction studies.

AB - Operation of a plasma source with a hot disk cathode and a cylindrical hollow anode in axial magnetic field is sensitive to the cathode-to-anode diameter ratio. When the cathode edge maps along magnetic field lines to the inner anode surface, the discharge voltage is relatively low, and the plasma stream with moderate density occupies the entire cross-section of the anode bore. By contrast, when the cathode projection is fully inside the anode bore with the radial cathode-to-anode gap ~ 1 cm, the discharge voltage jumps to much higher values exceeding 250 V. The plasma density profile becomes Gaussian-like with the width matching the cathode radius according to magnetic flux surfaces. The plasma density in the high-voltage cross-field discharge reaches 10 13 cm -3 , and the discharge parameters almost do not change with magnetic field up to 1.5 kG in the anode area. This plasma source is suitable for the use in linear devices for plasma-material interaction studies.

KW - Cross-field discharge

KW - Hollow anode

KW - Lanthanum hexaboride cathode

KW - Linear plasma device

KW - cross-field discharge

KW - linear plasma device

KW - lanthanum hexaboride cathode

KW - hollow anode

UR - http://www.scopus.com/inward/record.url?scp=85063607315&partnerID=8YFLogxK

U2 - 10.1585/pfr.14.2406004

DO - 10.1585/pfr.14.2406004

M3 - Article

AN - SCOPUS:85063607315

VL - 14

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

SN - 1880-6821

IS - Specialissue1

M1 - 2406004

ER -