Potential formation in a collisionless plasma produced in an open magnetic field in presence of volume negative ion source

2014 ◽  
Vol 21 (8) ◽  
pp. 084504 ◽  
Author(s):  
Ananya Phukan ◽  
K. S. Goswami ◽  
P. J. Bhuyan
Keyword(s):  
Magnetic Field ◽  
Collisionless Plasma ◽  
Ion Source ◽  
Negative Ion ◽  
Potential Formation ◽  
Open Magnetic Field

Collisionless plasma transport mechanisms in stochastic open magnetic field lines in tokamaks

2021 ◽  
Author(s):  
Min-Gu Yoo ◽  
Weixing Wang ◽  
Edward A Startsev ◽  
Chenhao Ma ◽  
S Ethier ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Collisionless Plasma ◽  
Plasma Transport ◽  
Transport Mechanisms ◽  
Field Lines ◽  
Open Magnetic Field

Dependence of H− extraction probability on filter magnetic field and gas pressure of a volume-type negative ion source

2006 ◽  
Vol 506-507 ◽  
pp. 522-526 ◽  
Author(s):  
Y. Matsumoto ◽  
M. Nishiura ◽  
K. Matsuoka ◽  
M. Sasao ◽  
M. Wada ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ion Source ◽  
Gas Pressure ◽  
Negative Ion

scholarly journals Numerical Simulations and the Design of Magnetic Field-Enhanced Electron Impact Ion Source with Hollow Cylinder Structure

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Guochen Qi ◽  
Di Tian ◽  
Guolun Gao ◽  
Guangda Liu ◽  
Chunling Qiu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Impact ◽  
Hollow Cylinder ◽  
Impact Ionization ◽  
Transmission Efficiency ◽  
Ion Source ◽  
Ionization Efficiency ◽  
Negative Ion ◽  
Ionization Source ◽  
Electron Intensity

An electron impact ion source-adopted magnetic field-enhanced technology has been designed for enhancing the electron intensity and the ionization efficiency. Based on the ion optic focus mechanism, an electron impact ionization source was designed, and the electron entrance into the ionization chamber was designed with a hollow cylinder structure to improve the ion extraction efficiency. Numerical simulation and optimal geometry were optimized by SIMION 8.0 to provide higher electron intensity and ion transmission efficiency. To improve the electron intensity, the influence of the filament potential and magnetic intensity was investigated, and the values of 70 eV and 150 Gs were chosen in our apparatus. Based on the optimal parameters, the air in the lab and oxygen gas was detected by the homemade apparatus, and the ion intensity was detected in the positive and negative ion modes, respectively. The homemade electron impact ion source apparatus has the potential to enhance ionization efficiency applied in the mass spectrometer ionization source.

Cross-field plasma acceleration and potential formation induced by electromagnetic waves in a magnetized plasma

2001 ◽  
Vol 66 (3) ◽  
pp. 143-155 ◽  
Author(s):  
R. SUGAYA
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Electric Field ◽  
Electromagnetic Waves ◽  
Collisionless Plasma ◽  
Magnetized Plasma ◽  
Propagating Waves ◽  
Potential Formation ◽  
Dynamo Effect ◽  
The Magnetic Field

A single-particle theory is developed to investigate particle acceleration along and across a magnetic field and the generation of an electric field transverse to the magnetic field induced by electromagnetic waves in a magnetized plasma. The almost perpendicularly propagating waves accelerate particles via their Landau and cyclotron damping, and the ratio of parallel and perpendicular drift velocities vs∥/vd can be proved to be proportional to k∥/k⊥. Simultaneously, an intense cross-field electric field E0 = B0×vd/c is generated via the dynamo effect owing to perpendicular particle acceleration to satisfy the generalized Ohm’s law. This means that this cross-field particle drift in a collisionless plasma is identical to E×B drift. It is verified that the transport equations obtained are exactly equivalent to those derived from the θ-dependent quasilinear velocity-space diffusion equation obtained from the Vlasov–Maxwell equations.

Improvement of uniformity of the negative ion beams by tent-shaped magnetic field in the JT-60 negative ion source

2014 ◽  
Vol 85 (2) ◽  
pp. 02B314 ◽  
Author(s):  
Masafumi Yoshida ◽  
Masaya Hanada ◽  
Atsushi Kojima ◽  
Mieko Kashiwagi ◽  
Larry R. Grisham ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Ion Beams ◽  
Ion Source ◽  
Negative Ion
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