Ion beam divergence from unstable fluctuations in applied‐B diodes

1993 ◽  
Vol 5 (5) ◽  
pp. 1614-1624 ◽  
Author(s):  
R. N. Sudan ◽  
D. W. Longcope
Keyword(s):  
Ion Beam ◽  
1993 ◽  
Vol 21 (5) ◽  
pp. 567-572 ◽  
Author(s):  
S. Miyamoto ◽  
K. Yasuike ◽  
N. Shirai ◽  
K. Imasaki ◽  
C. Yamanaka ◽  
...  

2018 ◽  
Vol 4 (3) ◽  
Author(s):  
Hu Chundong ◽  
Wu Mingshan ◽  
Xie Yahong ◽  
Wei Jianglong ◽  
Yu Ling

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 then heat back plate 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 (SG). And this process produces a large number of electrons. Due to the huge extracted voltage, the secondary electron emission coefficient of the SG surface is also high. As a result, the grids' current grows. According to the measurement of the current of SG and the calculation of the perveance of the corresponding shoot, the effect of ion beam divergence angle on back-streaming electrons can be analyzed. 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 SG. The results can guide the parameters operating on the ion source for Experimental Advanced Superconducting Tokamak-neutral beam injection (EAST-NBI) and find the reasonable operation interval of perveance and 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.


1991 ◽  
Vol 67 (22) ◽  
pp. 3094-3097 ◽  
Author(s):  
M. P. Desjarlais ◽  
T. D. Pointon ◽  
D. B. Seidel ◽  
R. S. Coats ◽  
M. L. Kiefer ◽  
...  
Keyword(s):  
Ion Beam ◽  

1978 ◽  
Vol 49 (6) ◽  
pp. 3091-3101 ◽  
Author(s):  
J. H. Whealton ◽  
L. R. Grisham ◽  
C. C. Tsai ◽  
W. L. Stirling
Keyword(s):  
Ion Beam ◽  

1985 ◽  
Vol 3 (1) ◽  
pp. 93-105 ◽  
Author(s):  
J. P. Vandevender ◽  
J. A. Swegle ◽  
D. J. Johnson ◽  
K. W. Bieg ◽  
E. J. T. Burns ◽  
...  

The Proto-I experiment for a proof-of-principle experiment is described resulting in a beam divergence for ions of only 14mrad at 1·5 MV—420 KA operation and 6 KA/cm2 anode current density before focusing. This is a better beam divergence than required for Sandia National Laboratories' PBFA I and II installations, for which scaling is discussed. Ion source development is reported and the PBFA II experiment described for 30 MV operation with short pulses (10–15 nsec) of lithium ions. Pulses of 50 nsec width and 130 KJ energy have been achieved from the prototype module for PBFA II.


AIAA Journal ◽  
1978 ◽  
Vol 16 (5) ◽  
pp. 516-524 ◽  
Author(s):  
G. Aston ◽  
H. R. Kaufman ◽  
P. J. Wilbur
Keyword(s):  
Ion Beam ◽  

1975 ◽  
Vol 14 (7) ◽  
pp. 1029-1034 ◽  
Author(s):  
Tohru Sugawara ◽  
Yoshihiro Ohara
Keyword(s):  
Ion Beam ◽  

2018 ◽  
Vol 123 (4) ◽  
pp. 043307 ◽  
Author(s):  
A. J. Deka ◽  
P. Bharathi ◽  
K. Pandya ◽  
M. Bandyopadhyay ◽  
M. Bhuyan ◽  
...  

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