Investigation of hydrogen recycling in long-duration discharges and its modification with a hot wall in the spherical tokamak QUEST

K Hanada, N Yoshida, T Honda, Z Wang… - Nuclear …, 2017 - iopscience.iop.org
Fully non-inductive plasma maintenance was achieved by a microwave of 8.2 GHz and 40
kW for more than 1 h 55 min with a well-controlled plasma-facing wall (PFW) temperature of …

Role of energetic electrons during current ramp-up and production of high poloidal beta plasma in non-inductive current drive on QUEST

S Tashima, H Zushi, M Isobe, K Hanada, H Idei… - Nuclear …, 2014 - iopscience.iop.org
A scenario for non-inductive current ramp-up has been demonstrated using electron
cyclotron waves in the spherical tokamak QUEST. The configuration was characterized by a …

Particle balance investigation with the combination of the hydrogen barrier model and rate equations of hydrogen state in long duration discharges on an all-metal …

K Hanada, N Yoshida, M Hasegawa… - Nuclear …, 2019 - iopscience.iop.org
The fuel particle balance during long duration discharges in the Q-shu University
Experiment with steady state spherical tokamak (QUEST) was investigated. QUEST has all …

A tritium permeation 'short cut'for plasma-facing components of fusion reactors

HS Zhou, HD Liu, L Wang, X Yang, Y Oya… - Nuclear …, 2018 - iopscience.iop.org
In ITER and other fusion reactors, plasma-facing components (PFCs) will be subjected to
intense plasma/neutral fluxes and tritium (T) permeation issue will be raised. In the present …

Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak

A Kuzmin, H Zushi, I Takagi, SK Sharma… - Journal of Nuclear …, 2015 - Elsevier
Hydrogen wall pumping is studied in steady state tokamak operation (SSTO) of QUEST with
all metal plasma facing materials PFMs at 100° C. The duration of SSTO is up to 820 s in …

Atomic and ionic hydrogen flux probe for quantitative in-situ monitoring of hydrogen recycling

A Kuzmin, K Miura, M Kobayashi, K Hanada… - Fusion Engineering and …, 2023 - Elsevier
A new combination diagnostic as a hydrogen recycling monitor in harsh conditions is
proposed. Combining permeation membrane probe with a Langmuir probe provides a …

[HTML][HTML] Spatial distribution of atomic and ion hydrogen flux and its effect on hydrogen recycling in long duration confined and non-confined plasmas

A Kuzmin, H Zushi, I Takagi, SK Sharma… - Nuclear Materials and …, 2017 - Elsevier
In order to understand the atomic hydrogen distribution in different kinds of plasma and its
influence on the recycling, two kinds of plasmas were used: non-confined annular electron …

Experimental study of breakdown time in a pulsed 2.45-GHz ECR hydrogen plasma reactor

OD Cortázar, A Megía-Macías… - IEEE transactions on …, 2012 - ieeexplore.ieee.org
An electron cyclotron resonance (ECR) plasma reactor developed at the European
Spallation Source Bilbao has been operated in pulsed mode at 50 Hz to study the …

Hydrogen flux measurements with permeation probes in spherical tokamak QUEST

A Kuzmin, H Zushi, I Takagi, SK Sharma, Y Hirooka… - Vacuum, 2016 - Elsevier
Poloidal and radial distributions of the hydrogen flux, both atomic and ion, to the plasma
facing materials (PFMs) are measured with four fixed and one movable PdCu membrane …

Design and development of hydrogen isotope sensor in liquid PbLi

A Sircar, SK Sharma, RB Patel, PA Rayjada - Fusion Engineering and …, 2014 - Elsevier
Indian LLCB–TBM uses liquid Lead-Lithium (Pb-Li) as tritium breeder, neutron multiplier and
coolant. Tritium bred in liquid PbLi stream has to be recovered by tritium extraction system …