Abstract
A 1-D kinetic collisional radiative model with state-of-the-art atomic data is developed and employed to simulate line emission to evaluate the Thermal Helium Beam (THB) diagnostic on NSTX-U. This diagnostic is currently in operation on RFX-mod, and it is proposed to be installed on NSTX-U. The THB system uses the intensity ratios of neutral helium lines 667.8, 706.5, and 728.1 nm to derive electron temperature (eV) and density (cm-3) profiles. The purpose of the present analysis is to evaluate the applications of this diagnostic for determining fast (∼4 μs) electron temperature and density radial profiles on the scrape-off layer and edge regions of NSTX-U that are needed in turbulence studies. The diagnostic is limited by the level of detection of the 728.1 nm line, which is the weakest of the three. This study will also aid in future design of a similar 2-D diagnostic system on the divertor.
| Original language | English |
|---|---|
| Article number | 053302 |
| Journal | Physics of Plasmas |
| Volume | 23 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 1 2016 |
Funding
The work at Johns Hopkins University was supported by the U.S. Department of Energy (DoE) under Grant No. DES0000787. The work at PPPL was supported under U.S. DoE Grant No. DE-AC02-09ch11466. The work at University of Wisconsin-Madison was supported under U.S. DoE Grant No. DE-SC0012315. The authors wish to acknowledge the support of the RFX-mod team, and also Dr. Stewart J. Zweben from PPPL for all his guidance and support.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | DES0000787, DE-SC0012315, DE-AC02-09ch11466 |
| Johns Hopkins University | |
| Horizon 2020 Framework Programme | 633053 |
| Princeton Plasma Physics Laboratory |
