(MAP) Session Report
Date: May 16, 2024
Time: 10:30 – 16:45
Shot#: 191271 – 191399 (129 shots)
Prior wall conditioning: He
Divertor pump: Off
Gas puff: H2, N2, Ne, Ar
Pellet: Impurity pellet, TESPELMay 17, 2024 (K. Mukai)

NBI#(1, 2, 3, 4, 5) = gas(H, H, H, -, -)=P(4.6, 4.2, 4.2, 4.0, 5.6) MWECH(77GHz) = ant(1.5-Uo, 5.5-U, 2-OUR)=P(-, 0.70, 0.38) MW
ECH(154GHz) = ant(2-OLL, 2-OUL, 2-OLR)=P(0.71, 0.89, 0.98) MW
ICH(3.5U, 3.5L, 4.5U, 4.5L) = P(-, -, -, -) MW
Topics
1. Construction of atomic data and plasma modeling toward understanding the origin of heavy elements (D. Kato)
2. Measurement of anisotropy in EVDF with polarization spectroscopy for Argon ion M1 lines (M. Goto)
3. Experimental identification of spectral lines from highly charged heavy ions (C. Suzuki)
4. Study of poloidal and toroidal asymmetries during impurity seeding in LHD (B.J. Peterson)
1Construction of atomic data and plasma modeling toward understanding the origin ofheavy elements D. KatoExperimental conditions:(Rax, Polarity, Bt, γ, Bq) = (3.6 m, CCW, 2.75 T,1.2538, 100.0%), #191274 - #191293, ECH (for start
3.2-3.5s), NBI#1-3 (3.5-5.5s), NBI#4-5(5.5-7.5s), H2
gas
Objectives
Measurements of high-resolution visible spectra ofablation cloud of La and Ce: the first lanthanide
elements identified in kilonova(GW170817/AT2017gfo).
Experiments• Carbon pellets containing each of La and Cepowders (about 200μg in average) were injectedby impurity pellet at 4.0s.
• Visible spectrometers (50cmVis2 and 1.33m),
central wavelength: 394nm, grating: 1800
grooves/mm, slit width: 25um, exposure time: 5 ms.

Preliminary results
The initial ne=1e19 m-3 increased up to 3e19 m-3
by the pellet injection, and it decayed down to 2e19
m-3 in 400 ms.
Figure shows visible spectra of pellet ablation
clouds for successive shots. The black spectrum ofC pellet and the red spectrum of La/C pellet. The
emission lines indicated by the red arrows can beassigned to La emission lines. Line identification isundergoing.

2#191296 – #191330

Ar II
Ar II

(Rax, Polarity, Bt, γ, Bq) = (3.6 m, CW, 2.75 T, 1.2538, 100%)

M. GotoAr XIV

Experimental conditions:

Ar II

Measurement of anisotropy in EVDF withpolarization spectroscopy for Argon ion M1 lines

Motivation and method: We have so far succeeded to detectpolarization in Lyman-alpha line
emission, and anisotropy in EVDF has
been analyzed with an atomic model.
 We attempt to measure polarization ofAr M1 lines due to ECH which areemitted in the core plasma.
Results:
 Ar XIV 441.2 nm (2s22p 2P1/2 – 2P3/2)
was identified.
 Initial analysis shows no clear
modulation insynchronized with
ECH injection.

#189289 (ECH)t (s)#190078 (NBI)t (s)Experimental identification of spectral lines from highly charged heavy ions

Experiment:
The heavy elements were injected into NBI plasmas withelectron density of (3–8)x1019 m-3 and electron temperatureof about 3 keV. Soft X-ray/EUV spectra in various
wavelength ranges were measured by SOXMOS and EUV
spectrometers.
Results:
In particular, we focus on the identification of forbidden(M1) lines of Ga-like ions in the longer wavelength region.
For example, we observed a candidate for such an M1 lineof Sm around 33 nm as shown in the figure.

Ch1(9.5–13.6 nm)

Ch2(27.8–34.0 nm)

Sm31+ (Ga-like)M1 line?

Experimental conditions:(Rax, Polarity, Bt, γ, Bq) = (3.6 m, CW, 2.75 T, 1.2538,100.0%) #191334–191360

Sm33+ (Cu-like)

Sm TESPEL

Sm32+ (Zn-like)

Objective: In order to further extend our database ofexperimental spectra from highly charged heavy ions, we
try to measure soft X-ray/EUV spectra of Pr, Nd and Sm
injected by TESPEL.

C. Suzuki et al.

4Toroidal a/symmetry with Ne and N2 seeding at Rax = 3.6 m, B (CW) B. Peterson and K. Mukai
Background and objective:- Bolometers are installed at 3-O, 6.5-L, 8-O and 10-O ports- Ne and N2 seeding experiment were performed at Rax = 3.6 m andB to investigate the toroidal asymmetry of radiation.
- in the next campaign we hope to repeat experiments with -B to lookat effect of B direction.
Experimental condition:- NBI #1, 2, 3, ne, bar=4 x 1019/m3, N2 or Ne puffing- density is held constant during impurity puff by feedback control- shots # 191361 – 191399 (39 shots)- with LID cancel- # 191372 reference shot with no impurity puff
N2 puffed shots:
Ne puffed shots:- #191366 from 3.5-L- #191382 from 3.5-L- #191367 from 5.5-L- #191383 from 5.5-L- #191368 from 9.5-L- #191381 from 9.5-L- #191369 from 3.5-L and 5.5-L- #191385 from 3.5-L and 5.5-L- #191373 from 9.5-L and 5.5-L- #191386 from 9.5-L and 5.5-L- #191374 from 9.5-L and 3.5-L- #191387 from 9.5-L and 3.5-L- #191388 from 3.5-L, 5.5-L, 9.5-L
Results:
Localized effects of impurity gas puffing observed especially with N2.