ACT2: a High Heat Flux Test Facility Using Electron Beam for Fusion Application

Abstract

ACT2 (Active Cooling Teststand 2), a high heat flux test facility using electron beam has been upgraded from ACT facility and started the operation. A new electron gun enables the steady state and transient heat load on actively cooled samples. ACT2 can achieve large loaded area with steady state reactor relevant heat flux (∼ 20 MW/m 2 ) up to 200 × 200 mm 2 and simulation of edge localized modes with short pulse length (∼ 100 µs).Beam profile was obtained about 9 mm with graphite probes. The heat flux is obtained by water calorimetry and measurement of the current through the samples.

High heat removal technique for a lithium neutron generation target used for an accelerator-driven BNCT system

“…The heat removal experiments were conducted using the active cooling test stand 2 (ACT2) in the National Institute for Fusion Science [15]. Figure 2 depicts the experimental setup for the heat removal experiment.…”

“…The present work intends to evaluate the heat transfer coefficient of the water-cooling channel with a V-shaped staggered rib (ribbed channel) in the target system of the accelerator driven neutron source. Heat load tests were performed to experimentally evaluate the heat transfer coefficient by setting a target base plate with the same water-cooling transfer system in an active cooling test stand [15] and an irradiating electron beam on the target plate. The target plate and cooling water temperatures were monitored by thermocouples.…”

Overview of Fusion Engineering Research in Japan Focusing on Activities in NIFS and Universities

“…High heat load test machine ACT2 (Active Cooling Teststand 2), with 40 keV and ~300 kW electron beam, has been used for characterizing high heat flux test components and materials 30 .…”

“…High Heat Flux Test (ACT2) 30 Ion Beam Surface Analysis 33 High heat flux test of W/Cu-alloy joints 31 Properties of re-solidified W 32 RBS for ion-implanted RAFM 33 Tritium Control of low level tritium…”

Pulse Shape Dependence of Vapor Shielding Efficiencies During Transient Heat Loads

“…Thus, erosion caused by the transient loads should be well investigated. High heat flux tests have been conducted by electron beam devices [6][7][8] and plasma guns [9][10][11]. These studies revealed that the erosion amounts can be summarized in the heat flux factor F HF = ε ⊥ τ −0.5 where author's e-mail: kibano@eei.eng.osaka-u.ac.jp ε ⊥ is the energy density into the target surface and τ is the heat pulse duration [1,12].…”