scholarly journals 3D numerical simulations of negative hydrogen ion extraction using realistic plasma parameters, geometry of the extraction aperture and full 3D magnetic field map

2014 ◽  
Vol 85 (2) ◽  
pp. 02B301 ◽  
Author(s):  
S. Mochalskyy ◽  
D. Wünderlich ◽  
B. Ruf ◽  
P. Franzen ◽  
U. Fantz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Simulations ◽  
Hydrogen Ion ◽  
Plasma Parameters ◽  
Ion Extraction ◽  
Negative Hydrogen Ion

Negative hydrogen ion extraction and electron control in a multipole ion source

1986 ◽  
Vol 57 (10) ◽  
pp. 2396-2401 ◽  
Author(s):  
M. P. S. Nightingale ◽  
A. J. T. Holmes ◽  
J. D. Johnson
Keyword(s):  
Ion Source ◽  
Hydrogen Ion ◽  
Ion Extraction ◽  
Negative Hydrogen Ion

Optimization of plasma parameters with magnetic filter field and pressure to maximize H− ion density in a negative hydrogen ion source

2016 ◽  
Vol 87 (2) ◽  
pp. 02B136 ◽  
Author(s):  
Won-Hwi Cho ◽  
Jeong-Jeung Dang ◽  
June Young Kim ◽  
Kyoung-Jae Chung ◽  
Y. S. Hwang
Keyword(s):  
Ion Source ◽  
Hydrogen Ion ◽  
Plasma Parameters ◽  
Ion Density ◽  
Magnetic Filter ◽  
Negative Hydrogen Ion

Transient Behavior of Negative Hydrogen Ion Extraction from Plasma

2013 ◽  
Vol 15 (9) ◽  
pp. 945-949 ◽  
Author(s):  
Chaohui Lan ◽  
Yufei Peng ◽  
Zhen Yang ◽  
Jidong Long
Keyword(s):  
Transient Behavior ◽  
Hydrogen Ion ◽  
Ion Extraction ◽  
Negative Hydrogen Ion

Numerical simulation on multi-peak magnetic field configuration for negative hydrogen ion source

2011 ◽  
Vol 23 (10) ◽  
pp. 2767-2772 ◽  
Author(s):  
王小敏 Wang Xiaomin ◽  
杨超 Yang Chao ◽  
刘大刚 Liu Dagang ◽  
王学琼 Wang Xueqiong
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Field Configuration ◽  
Ion Source ◽  
Hydrogen Ion ◽  
Magnetic Field Configuration ◽  
Negative Hydrogen Ion

scholarly journals Negative Hydrogen Ion Sources for Fusion: From Plasma Generation to Beam Properties

2021 ◽  
Vol 9 ◽  
Author(s):  
U. Fantz ◽  
S. Briefi ◽  
A. Heiler ◽  
C. Wimmer ◽  
D. Wünderlich
Keyword(s):  
Negative Ions ◽  
Source Area ◽  
Current Drive ◽  
Ion Sources ◽  
Hydrogen Ion ◽  
Reliable Operation ◽  
Plasma Generation ◽  
Ion Extraction ◽  
Main Challenge ◽  
Negative Hydrogen Ion

The neutral beam injection systems for the international fusion experiment ITER used for heating, current drive, and diagnostic purposes are based on RF-driven negative hydrogen ion sources with a source area of roughly 0.9 m × 1.9 m. The sources operate at 0.3 Pa in hydrogen and in deuterium using a total available RF generator power of 800 kW per source at a frequency of 1 MHz. In order to fulfill the challenging requirements for ITER and beyond (like a DEMOnstration power plant, DEMO), worldwide developments are underway addressing the topics of plasma generation, ion extraction together with the issue of reducing and stabilizing the co-extracted electron current, and the beam properties. At the example of the activities at the ITER prototype source and the size scaling experiment ELISE, the present status and its challenges are summarized. The RF power transfer efficiency of these sources is only about 65% in maximum, giving significant room for improvements to relax the demands on the RF generator and ensure reliable operation. The plasma uniformity in front of the large extraction system is the result of plasma drifts. They have a huge impact on the nonuniformity of the co-extracted electrons and influence the ions and thus the beam properties as well. Understanding the optics of such large beams composed of hundreds of beamlets is a crucial task and is under continuous improvement. The main challenge, however, is still the fulfillment of the ITER requirements for deuterium, in particular, for long pulses. The management of caesium, which is evaporated into the source to generate sufficient negative ions by the surface conversion process, is one of the keys for stable and reliable operation.

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