Initial beam extraction results of a prototype long pulse ion source for the KSTAR NBI heating system

2003 ◽  
Author(s):  
D.H. Chang ◽  
C.S. Seo ◽  
Y.W. Jun ◽  
B.H. Oh ◽  
S.H. Jeong ◽  
...  
Keyword(s):  
Heating System ◽  
Ion Source ◽  
Beam Extraction ◽  
Initial Beam ◽  
Long Pulse

scholarly journals Long Pulse H[sup −] Beam Extraction With A RF Driven Ion Source With Low Fraction Of Co-Extracted Electrons

2009 ◽  
Author(s):  
W. Kraus ◽  
M. Berger ◽  
U. Fantz ◽  
P. Franzen ◽  
M. Fröschle ◽  
...  
Keyword(s):  
Ion Source ◽  
Beam Extraction ◽  
Long Pulse

Long pulse beam extraction with a prototype ion source for the KSTAR neutral beam system

2008 ◽  
Vol 79 (2) ◽  
pp. 02C101 ◽  
Author(s):  
Byung-Hoon Oh ◽  
Doo-Hee Chang ◽  
Seung Ho Jeong ◽  
Kwang-Won Lee ◽  
Sang-Ryul In ◽  
...  
Keyword(s):  
Ion Source ◽  
Neutral Beam ◽  
Beam Extraction ◽  
Pulse Beam ◽  
Beam System ◽  
Long Pulse

scholarly journals Spatial Distributions of Charged Particles and Plasma Potential before and during Beam Extraction in a Negative Hydrogen Ion Source for NBI

2015 ◽  
Vol 10 (0) ◽  
pp. 3405016-3405016 ◽  
Author(s):  
Shaofei GENG ◽  
Katsuyoshi TSUMORI ◽  
Haruhisa NAKANO ◽  
Masashi KISAKI ◽  
Yasuhiko TAKEIRI ◽  
...  
Keyword(s):  
Charged Particles ◽  
Plasma Potential ◽  
Ion Source ◽  
Hydrogen Ion ◽  
Spatial Distributions ◽  
Beam Extraction ◽  
Negative Hydrogen Ion

Beam extraction from a compact Ku-band electron cyclotron resonance ion source with double resonance modes

2000 ◽  
Vol 71 (2) ◽  
pp. 1110-1112
Author(s):  
E. Tojyo ◽  
M. Oyaizu ◽  
S. C. Jeong ◽  
H. Ishiyama ◽  
Y. Ishida ◽  
...  
Keyword(s):  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Double Resonance ◽  
Ion Source ◽  
Electron Cyclotron ◽  
Beam Extraction ◽  
Band Electron ◽  
Resonance Modes ◽  
Ku Band

scholarly journals Development of Long Pulse Arc Driven Ion Source for iBNCT

2021 ◽  
Author(s):  
Takanori Shibata ◽  
Takashi Sugimura ◽  
Kiyoshi Ikegami ◽  
Akira Takagi ◽  
Masaharu Sato ◽  
...  
Keyword(s):  
Ion Source ◽  
Long Pulse

Spatial distribution of the charged particles and potentials during beam extraction in a negative-ion source

2012 ◽  
Vol 83 (2) ◽  
pp. 02B116 ◽  
Author(s):  
K. Tsumori ◽  
H. Nakano ◽  
M. Kisaki ◽  
K. Ikeda ◽  
K. Nagaoka ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Charged Particles ◽  
Ion Source ◽  
Negative Ion ◽  
Beam Extraction

Analysis of the Effect of Beam Divergence Angle on Back-Streaming Electron Region in Ion Source for EAST-NBI

2017 ◽  
Author(s):  
Chundong Hu ◽  
Mingshan Wu ◽  
Yahong Xie ◽  
Jianglong Wei ◽  
Ling Yu
Keyword(s):  
Cross Section ◽  
Secondary Electron Emission ◽  
Circular Cross Section ◽  
Ion Source ◽  
Beam Divergence ◽  
Divergence Angle ◽  
Beam Extraction ◽  
Emission Surface ◽  
Ion Emission ◽  
Beam Divergence Angle

During the process of beam extraction in positive ion source under high voltage region, a large number of electrons are produced in the gaps of grids. After back-streaming acceleration, these electrons go back to arc chamber or impinge grids and heat electron dump or grids, which are harmful for the safety of ion source. Under the situation of poor beam extraction optics, a large part of the primary beam ions bombard the surface of suppressor grid. And this process produces a large number of electrons. Due to the huge extracted voltage, the secondary electron emission coefficient of the suppressor grid surface is also great, when beam ions bombard on it. As a result, the grids’ current grows. The curvature of ion emission surface and equipotential surface nearby are mainly connected to the perveance and plasma grid geometry. In order to optimize the beam performance of high current ion source and increase the mean arc efficiency, the plasma grid of accelerator is already replaced from circular cross section grid to diamond cross section grid. As a result, the shape of ion emission surface is only connected to the perveance. According the measurement of the current of suppressor grid and the calculation of the perveance of the corresponding shoot, we can analyze the effect of beam divergence angle on back-streaming electron. When the beam divergence angle increases, the number of back-streaming electrons increases rapidly, and grids current changes significantly, especially the current of gradient grid and suppressor grid. The results can guide the parameters operating on the ion source for EAST-NBI and find the reasonable operation interval of perveance and the best one to ensure the safety and stable running of the ion source, which has great significance on the development of long pulse, high power ion source.

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