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 …

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 …

After several experimental campaigns in the Kyushu University Experiment with Steady-state
Spherical Tokamak (QUEST), the originally stainless steel plasma-facing wall (PFW) …

Successful production of high β p plasmas (εβ p⩾ 1) fully non-inductively (NI) and their long
pulse sustainment with the help of modest power (< 100 kW) of electron cyclotron waves is …

In tokamaks, the temperature of the plasma-facing wall is an important parameter for
achieving particle balance and therefore steady-state operation. QUEST, which is a middle …

A new combination diagnostic as a hydrogen recycling monitor in harsh conditions is
proposed. Combining permeation membrane probe with a Langmuir probe provides a …

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 …

The plasma control system (PCS) of QUEST is developed according to the progress of
QUEST project. Since one of the critical goals of the project is to achieve the steady-state …

This research investigated fuel particle balance during long duration discharge in an all-
metal plasma facing wall (PFW) through intensive QUEST execution. A simple wall model …

A permeation probe is a useful device for detecting the atomic hydrogen flux to plasma-
facing walls. Recently, we developed a new type of probe using 60Pd-40Cu alloy (PdCu) as …