(Special, MAP) Session Report
Date: Mar. 21, 2024
Time: 10:41 – 14:26
Shot#: 187893 – 187968 (76 shots)
Prior wall conditioning: None
Divertor pump: On
Gas puff: H2, Ar
Pellet: TESPEL

Mar. 22, 2024 (G. Motojima)

NBI#(1, 2, 3, 4, 5) = gas(H, H, H, H, H)=P(3.8, 3.8, 4.0, 3.6, 2.8) MW
ECH(77GHz) = ant(1.5-Uo, 5.5-U, 2-OUR)=P(0.689, 0.38, -) MW
ECH(154GHz) = ant(2-OLL, 2-OUL, 2-OLR)=P(0.705, -, -) MWICH(3.5U, 3.5L, 4.5U, 4.5L) = P(0.7, 0.61, 0.62, 0.7)MWTopics
1. ECH/ICH Commissioning (R. Yanai, T. Seki) will be reported next week.
2. Impurity behaviour study with triple TESPEL injection (M. Kubkowska(IPPLM), N. Tamura)Impurity behaviour study in LHD plasmas in experiment with triple TESPEL injection(M. Kubkowska, N. Tamura, M. Gruca, Ch. Suzuki et al.)Magnetic configuration: (Rax, Polarity, Bt, γ, Bq) = (3.60 m, CCW, 2.75 T, 1.2538, 100.0%)
Shots: #187926 - #187965
Backgroundl In the recent LHD experiment, a successful TESPELs with Ti/V/Mn, Fe/Ni/Cu injection was obtained for an electron
density of 1 – 5 ×1019 m-3. In some cases for higher density experiment was not conducted or the plasma was collapsed.
The main aim of this experiment is to obtain the data by using TESPELs containing Ca (CaAl2O4), Si (SiB6) and Cu tocomplete the data obtained in the last experimental campaigns and for comparison with the future results in W7-X. Theinjection of Si(14)/Ca(20)/Cu(29) elements allowed to study impurity behaviour in various plasma conditions. Calcium
has not been injected yet into the W7-X plasma, it will be interesting to study its behaviour at LHD, to properly prepare
the experiment at the W7-X.
Objectives
l Estimate the impurity decay time based on the line intensity evolution for injected elementsl Estimate the impurity decay time based on the line intensity evolution for various electron density of plasma (1-5E19).
l The identification of the spectra will be supported by the simulations using Flexible AtomicCode (using the CollisionalRadiative CR model).

Impurity behaviour study in LHD plasmas in experiment with triple TESPEL injection(M. Kubkowska, N. Tamura, M. Gruca, Ch. Suzuki et al.)Resultsl TESPELs are successfully injected into the ECR-heated LHD H plasmas with neup to 4.5E19 m-3
l Density scan was possible to achived
Element ¥ ne

1.5E192.5E194.5E19CaAl2O4✓✓✓

SiB6Cu

✓
✓

✓
✓

✓
✓

l Emission lines from Si(14)/Ca(20)/Cu(29) have been observed clearly, Ca Be- andLi-like lines, Si Li-like line and Cu Mg- and Na-lines à To be analyzedImpurity behaviour study in LHD plasmas in experiment with triple TESPEL injection(M. Kubkowska, N. Tamura, M. Gruca, Ch. Suzuki et al.)Ca XVIII@30.22 nm
Li-like 2s-2p

Ca XVII@19.28 nm
Be-like 2s2-2s2p

In the experiment with CaAl2O4 injection, Ca Be- andLi-like spectral lines are clearly observed in SOXMOS
dataImpurity behaviour study in LHD plasmas in experiment with triple TESPEL injection(M. Kubkowska, N. Tamura, M. Gruca, Ch. Suzuki et al.)Si XII@49.94 nm
Li-like 2s-2p

In the experiment with SiB6 injection, Si Be- and Lilike spectral lines are clearly observed in SOXMOS
dataImpurity behaviour study in LHD plasmas in experiment with triple TESPEL injection(M. Kubkowska, N. Tamura, M. Gruca, Ch. Suzuki et al.)Cu XIX@27.35 nm
Na-like 3s-3p

Cu XVIII@ 23.420 nm
Mg-like 3s2-3s3p

In the experiment with Cu injection, Cu Be- and Nalike spectral lines are clearly observed in SOXMOS
data