Multiplication of runaway electrons in discharges with repeated fuel pellet injection

1999 ◽  
Vol 25 (8) ◽  
pp. 606-609 ◽  
Author(s):  
B. V. Kuteev ◽  
A. Yu. Kostryukov
Keyword(s):  
Fuel Pellet ◽  
Runaway Electrons ◽  
Pellet Injection

scholarly journals Characteristics of Post-Disruption Runaway Electrons with Impurity Pellet Injection

2005 ◽  
Vol 81 (8) ◽  
pp. 593-601 ◽  
Author(s):  
Yasunori KAWANO ◽  
Tomohide NAKANO ◽  
Akihiko ISAYAMA ◽  
Nobuyuki ASAKURA ◽  
Hiroshi TAMAI ◽  
...  
Keyword(s):  
Runaway Electrons ◽  
Pellet Injection

scholarly journals Влияние градиента концентрации плазмы на возбуждение ионно-циклотронных колебаний в омических разрядах токамака ТУМАН-3М

2019 ◽  
Vol 45 (18) ◽  
pp. 27
Author(s):  
А.А. Белокуров ◽  
Г.И. Абдуллина ◽  
Л.Г. Аскинази ◽  
Н.А. Жубр ◽  
В.А. Корнев ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Density Gradient ◽  
Initial Level ◽  
Fuel Pellet ◽  
Plasma Parameters ◽  
Cyclotron Instability ◽  
Ion Cyclotron ◽  
Pellet Injection ◽  
Magnetic Probes ◽  
Excitation Conditions

In TUMAN-3M tokamak ohmic hydrogen and deuterium discharges oscillations with ion cyclotron (IC) frequency were detected. Fast magnetic probes poloidal array in TUMAN-3M is capable of detecting several harmonics of IC frequency of main plasma isotope. Fuel pellet injection significantly reduces IC oscillations intensity, though after complete pellet evaporation returns to initial level. IC oscillations localization and excitation conditions are of certain interest. Based on drift-cyclotron instability excitation theory and numerical modeling of scenarios with ohmic LH-transition and pellet-injection plasma parameters (density gradient primarily) effect on IC oscillations excitation was studied.

Physics of runaway electrons with shattered pellet injection at JET

2022 ◽  
Author(s):  
Cedric Reux ◽  
Carlos Paz-Soldan ◽  
Nicholas W. Eidietis ◽  
Michael Lehnen ◽  
Pavel Aleynikov ◽  
...  
Keyword(s):  
Gas Injection ◽  
Runaway Electrons ◽  
Large Area ◽  
Reliable Operation ◽  
Mhd Instability ◽  
Current Collapse ◽  
Pellet Injection ◽  
Heat Loads

Abstract Runaway electrons created during tokamak disruptions pose a threat to a reliable operation of future larger machines. Experiments using Shattered Pellet Injection (SPI) have been carried out at the JET tokamak to investigate ways to prevent their generation or suppress them if avoidance is not sufficient. Avoidance is possible if the SPI contains a sufficiently low fraction of high-Z material, or if it is fired early in advance of a disruption prone to runaway generation. These results are consistent with previous similar findings obtained with Massive Gas Injection. Suppression of an already accelerated beam is not efficient using High-Z material, but deuterium leads to harmless terminations without heat loads. This effect is the combination of a large MHD instability scattering runaway electrons on a large area and the absence of runaway regeneration during the subsequent current collapse thanks to the flushing of high-Z impurities from the runaway companion plasma. This effect also works in situations where the runaway beam moves upwards and undergoes scraping-off on the wall.

Analysis of an arc-driven railgun for fusion fuel pellet injection

1990 ◽  
Vol 26 (6) ◽  
pp. 3097-3101 ◽  
Author(s):  
B. Azzerboni ◽  
E. Cardelli ◽  
M. Raugi ◽  
A. Tellini
Keyword(s):  
Fuel Pellet ◽  
Pellet Injection

Fuel pellet injection into heavy-ion inertial fusion reactor

2020 ◽  
Vol 35 ◽  
pp. 100741
Author(s):  
H. Nakamura ◽  
T. Kubo ◽  
T. Karino ◽  
H. Kato ◽  
S. Kawata
Keyword(s):  
Fusion Reactor ◽  
Heavy Ion ◽  
Fuel Pellet ◽  
Inertial Fusion ◽  
Pellet Injection

scholarly journals 10-Hz beads pellet injection and laser engagement

2021 ◽  
Author(s):  
Yoshitaka Mori ◽  
Katsuhiro Ishii ◽  
Ryohei Hanayama ◽  
Shinichiro Okihara ◽  
Yoneyoshi Kitagawa ◽  
...  
Keyword(s):  
Fusion Energy ◽  
Free Fall ◽  
Laser Pulses ◽  
Intense Laser ◽  
Injection System ◽  
Fuel Pellet ◽  
Inertial Fusion ◽  
Inertial Fusion Energy ◽  
Pellet Injection ◽  
Γ Ray

Abstract Laser Inertial Fusion Energy reactor requires repetitive fuel pellet injection and laser engagement to fuse fusion fuel beyond a few Hz. We demonstrate 10 Hz free-fall bead pellets injection and laser engagement with γ-ray generation. Diameter of 1 mm deuterated polystyrene beads were engaged by counter illuminating ultra-intense laser pulses with intensity of 5 x1017 W/cm2 at 10 Hz. The spatial distribution of free-fall beads was 0.86 mm in horizontal, and 0.18 mm in vertical. The system operated beyond 5 minute, 3500 beads supply with achieved frequencies of 2.1 Hz for illumination on bead and 0.7 Hz for γ-ray generation, these frequencies increments three times in relation to the previous 1 Hz injection system. The operation duration was limited by pellet supply. This injection and engagement system can apply for Laser Inertial Fusion Energy research platform.

Effect of fuel pellet injection velocity on the energy parameters of a tokamak reactor

1979 ◽  
Vol 19 (12) ◽  
pp. 1619-1625 ◽  
Author(s):  
N.N. Vasil'ev ◽  
V.Eh. Lukash ◽  
A.V. Nedospasov
Keyword(s):  
Fuel Pellet ◽  
Injection Velocity ◽  
Tokamak Reactor ◽  
Energy Parameters ◽  
Pellet Injection

scholarly journals Mitigation of divertor heat flux by high-frequency ELM pacing with non-fuel pellet injection in DIII-D

2017 ◽  
Vol 12 ◽  
pp. 1030-1036 ◽  
Author(s):  
A. Bortolon ◽  
R. Maingi ◽  
D.K. Mansfield ◽  
A. Nagy ◽  
A.L. Roquemore ◽  
...  
Keyword(s):  
Heat Flux ◽  
High Frequency ◽  
Fuel Pellet ◽  
Pellet Injection
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