Major test facilities

  1. Electron beam test facility (JEBIS)
  2. Ion beam test facility (PBEF)
  3. Low energy ion beam test facility (SLEIS)

1. Electron beam test facility (JEBIS)

JAEA Electron Beam Irradiation Stand.

 The construction of the electron beam test facility, JEBIS, was finished in March 1988.
 This facility can perform not only disruption simulation experiments of divertor armor materials but also high heat flux experiments of middle-scale divertor mock-ups.


Major performance of JEBIS is summarized as follows;

Output 400kW
Max. acceleration voltage 100kV
Max. electron beam current 4A
Electron beam pulse duration 1ms - CW
Max. heat flux 2GW/m2 (in 0.8cm2)
Max. heating area 1800cm2 (at 0.2MW/m2)
Coolant system Closed loop, purified water, 4MPa


Overall view of JEBIS


High heat flux experiment of divertor mockups in JEBIS
Detachment of the armor tiles on both edge begins. Detachment of the central armor tile also begins.
Detachment of the armor tile on left edge progresses. Just after the heating
8 seconds after the heating Disruption simulation experiment taken from a high speed camera (1000 frames/s)

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2. Ion beam test facility (PBEF)

Particle Beam Engineering Facility.

 This facility has a positive ion source as a heat source. PBEF was originally developed as a prototype of JT-60 neutral beam injectors (JT-60 NBI). Vacuum vessel of PBEF has been modified to perform high heat flux tests of divertor mock-ups. There are two ion sources available. One is similar to the hydrogen ion source used in JT-60 NBI. The other is a large ion source for the high heat flux tests of full-scale ITER divertor mock-ups. This large ion source, namely "KAMABOKO source", was developed in JAEA, based on the R&Ds on the negative ion source.

Major performance of PBEF is summarized as follows;

Output 1.5 MW
Max. acceleration voltage 50kV
Max. ion beam current 30A
Ion beam pulse duration up to 1,000s



Picture (left) : vacuum vessel (light green) and X-ray shield room (yellow)
Picture (right) : close up view of the vacuum vessel (Main door is opened.)



Picture (left) : large ion source
Picture (right) : installation of the large ion source

(Click here for the side elevation of the large ion source)

Full-scale ITER divertor mock-ups

Divertor mock-ups in operation

(The hydrogen ion beam extracted from an ion source is shown as a white band.)

(The large ion source was used in this experiment.)

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3. Low energy ion beam test facility (SLEIS)

Super Low Energy particle Irradiation System.

In ITER, PFCs are designed as components needing periodic replacement since the armor materials of the PFCs are eroded by particle flux, such as fuel gas and helium ash, from the plasma. The frequency of the replacement strongly depends on the durability of the armor materials against the particle flux. SLEIS was developed to perform erosion experiments of armor materials. This device can generate high ion flux with an order of 1020H/m2s(Max5.3×1020H/m2s).

Major performance

Ion species : Hydrogen, Deuterium, Helium

Energy : 55-204 eV (28 - 102 eV/H)

Ion flux (Max):5.3×1020H/m2s (at 82eV/H)

Irradiation area : 25mm x 25mm~

Controllable specimen temperature : 100 - 700 (deg-C)

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