Impurity pellet injector
T.Oishi, S. Morita, M. Gotoe-mail: oishi@nifs.ac.jp

1.

Purpose / Application[1] Impurity transport study[2] Spectral identification[3] Improvement of ion temperature

2.

Name of analysis (Kaiseki) data / module of MyView2
noneGeneral Description (Port, field line, time resolution, spatial resolution, number ofchannels, etc.)
3.1. Impurity pellet injector- Pellet size: 0.6-1.8 mm in diameter and height- Pellet shape: cylinder, coaxial, sphere and hemisphere- Pellet speed: ~200 m/s- Pellet injection: 1 pellet/shot- Pressure of He gas for pellet acceleration: 10-20 atm
3.2. Port assembly3.

- #10-O port (see Fig. 1)- A pellet is injected at the equatorial plane with an angle of 12° from the normal to thetoroidal magnetic field.

(a)Figure 1 (a) Top View of the port arrangement. (b) Side view of the pellet injector.

(b)

4.

Requirement in use- Before experiment: loading pellets in the pellet disk, supplying pressurized He gas andturning on power supply of the controller.
-After experiment: Lowering He gas pressure and turning off power supply of the controller.

5.

Description of analysis (Kaiseki) data / module of MyView2
none

6.

Others- Example of structure of coaxial pellets (see Fig. 2).

Figure 2 Photos of (a) W-in-polyethylene and (b) W-in-carbon coaxial pellets. The yellow dashed lines
denote the position of tungsten wire.

- Example of ion temperature improvement by injection of a carbon pellet (see Fig. 3).

Figure 3 Discharge waveforms of (a) NBI power, (b) line-averaged electron density, (c) central
electron and ion temperatures, (d) plasma stored energy and (e) total radiation power. Cylindricalcarbon pellet with a size of 1.4φ mm × 1.4Lmm is injected at t=1.82 s as indicated by arrow.

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