Low Z impurity ion extraction from Tokamak Fusion Test Reactor ion sources

1993 ◽  
Vol 64 (10) ◽  
pp. 2729-2736 ◽  
Author(s):  
J. H. Kamperschroer ◽  
L. R. Grisham ◽  
R. A. Newman ◽  
T. E. O’Connor ◽  
T. N. Stevenson ◽  
...  
Keyword(s):  
Ion Sources ◽  
Ion Extraction ◽  
Test Reactor ◽  
Impurity Ion

scholarly journals Low Z impurity ion extraction from TFTR ion sources

1993 ◽  
Author(s):  
J.H. Kamperschroer ◽  
L.R. Grisham ◽  
R.A. Newman ◽  
T.E. O'Connor ◽  
T.N. Stevenson ◽  
...  
Keyword(s):  
Ion Sources ◽  
Ion Extraction ◽  
Impurity Ion

scholarly journals Low Z impurity ion extraction from TFTR ion sources

1993 ◽  
Author(s):  
J.H. Kamperschroer ◽  
L.R. Grisham ◽  
R.A. Newman ◽  
T.E. O`Connor ◽  
T.N. Stevenson ◽  
...  
Keyword(s):  
Ion Sources ◽  
Ion Extraction ◽  
Impurity Ion

Impurity ion production in alkali ion sources

1990 ◽  
Vol 61 (4) ◽  
pp. 1338-1339 ◽  
Author(s):  
M. J. Hogan ◽  
P. P. Ong
Keyword(s):  
Ion Sources ◽  
Ion Production ◽  
Impurity Ion ◽  
Alkali Ion

Effect of Coulomb collision on the negative ion extraction mechanism in negative ion sources

2016 ◽  
Vol 87 (2) ◽  
pp. 02B918 ◽  
Author(s):  
I. Goto ◽  
K. Miyamoto ◽  
S. Nishioka ◽  
S. Mattei ◽  
J. Lettry ◽  
...  
Keyword(s):  
Ion Sources ◽  
Negative Ion ◽  
Coulomb Collision ◽  
Extraction Mechanism ◽  
Ion Extraction

scholarly journals Factors influencing parameters of laser ion sources

2007 ◽  
Vol 25 (2) ◽  
pp. 199-205 ◽  
Author(s):  
L. Láska ◽  
J. Badziak ◽  
F.P. Boody ◽  
S. Gammino ◽  
K. Jungwirth ◽  
...  
Keyword(s):  
Laser Beam ◽  
State Energy ◽  
Ion Sources ◽  
The Self ◽  
Longitudinal Structure ◽  
Linear Processes ◽  
Ion Extraction ◽  
Factors Influencing ◽  
Influencing Parameters ◽  
Irradiation Angle

Various applications demand various kinds of ions. Charge state, energy and the amount of laser produced ions depend, primary, on the wavelength, the energy, the pulse duration, and the focusing ability of the laser used. Angle of the target irradiation, angle of the ion extraction (recording), and mainly the focus setting may significantly influence especially the portion of ions with the highest charge states. The participation of non-linear processes on the generation of ions with extremely high parameters is demonstrated. The observed effects support the idea of a longitudinal structure of the self-focused laser beam with a space period of ∼200 µm.

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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