(IA) Session Report
Date: Apr. 17, 2024
Time: 10:30 – 16:45
Shot#: 189669 – 189790 (122 shots)
Prior wall conditioning: NONE
Divertor pump: off
Gas puff: H2, He
Pellet: LiF
NBI#(1, 2, 3, 4, 5)=gas(H, H, H, H, H)=P(4.8, 4.2, 4.5, 3.9, 4.3, 5.6) MWECH(77GHz)=ant(5.5U-Out, 2O-UR)=P(0.698, 0.380) MW
ECH(154GHz)=ant(2-OLL, 2-OUL, 2-OLR)=P(0.705, 0.889, 0.982) MWECH(56GHz)=ant(1.5U)=P(-)kW
ICH(3.5U, 3.5L, 4.5U, 4.5L)=P(-, -, -, - )MW

Apr. 18, 2024 (K. Ogawa)

Topics
1. Observation of gamma-ray emission from Li-H reaction for fast ion diagnostics (H. Matsuura(Kyushu Univ.), K. Ogawa)
2. Understanding the dependence of fast ion distribution on various magnetic field configurations using
the newly installed Imaging Neutral Particle Analyzer (INPA) (S. Sangaroon (Mahasarakham Univ.), K.
1Ogawa)Observation of gamma-rays emitted by Li-hydrogen isotope reactions for fast ion diagnostics
H. Matsuura, K. Ogawa et al.

Experimental conditions: : (Rax, Polarity, Bt, γ, Bq) = (3.6 m, CCW, 2.75 T, 1.2538, 100)
⁓1.3 mm（ #189671 - #189742）
Background and motivation:

Observation of gamma rays from the 6Li(p,γ)7Be
and 6Li(d,pγ)7Li reactions was carried out tounderstand fast-ion diagnostics using gamma-rays,e.g. α-d, α-Be reactions in the future fusion plasma.
Results:○ At 4.0 (or 3.8) s after the beginning of plasma
discharge, a 6LiF pellet was injected into ahydrogen plasma with H-NBs (#1 + 2 + 3).
○ Net γ-ray counts during the 0.2 seconds after pellet
injection for 41 shots were piled up.
○ The 0.43 (0.48) MeV γ-rays which may be emitted
from the 6Li(p, γ)7Be (6Li(d, pγ)7Li) reactions were
measured with sufficient accuracy (count rate).

Cylindrical 6LiF
sintered pellet#189724⁓0.5 mm

Pellet injection#189724

0.48 MeV

measured

0.43 MeV

net count(b.g. excluded)

Understanding the dependence of fast ion distribution on various magnetic field
configurations using the newly installed Imaging Neutral Particle Analyzer (INPA)
S. Sangaroon (MSU), K. Ogawa (NIFS), M. Isobe (NIFS), W. Paenthong (SOKENDAI), X.D. Du (GA),
A. Wisitsorasak (KMUTT), N. Poolyarat (TINT), B. Chatthong (PSU), T. Onjun (TINT)

Experimental conditions: (Rax, Polarity, Bt, γ, Bq) =(3.60 m, CCW, 2.75 T, 1.2538, 100.0%) Shots: #189746 - #189766(3.75 m, CCW, 2.64 T, 1.2538, 100.0%) Shots: #189767 - #189789*On 29/04/2024, we have: 3.6 m, CW, 2.750 T for density scan.
*On 16/04/2024, we have: 3.9 m, CW, 2.538 T for density scan.
Motivation & Objectives• This proposal aims to achieve a deeper understanding ofenergetic particle behavior during P-NB injection in theLHD, utilizing the newly installed INPA across a range ofmagnetic field configurations. This includes variations inmagnetic field strength (Bt), magnetic axis position (Rax),and plasma density (ne).
Results• We successfully observed helically trapped beam ion
behavior during P-NB injection while conducting density
scans ranging from 1 to 4 x 1019 m-3 under various magnetic
field configurations.
3.6 m, CW, 2.75 T

1 x 1019 m-3

2 x 1019
m-3

3.6 m, CCW, 2.75 T
1 x 1019 m-3

1.5 x 1019 m-3

2 x 1019 m-3

3 x 1019 m-3

3.5 x 1019 m-3

4 x 1019 m-3

3.75 m, CCW, 2.64 T
1 x 1019 m-3

1.5 x 1019 m-3

2 x 1019 m-3

3 x 1019 m-3

3.5 x 1019 m-3

4 x 1019 m-3

3.9 m, CW, 2.538 T

1 x 1019
m-3

2 x 1019
m-3

2.5 x 1019 m-3

2.5 x 1019 m-3