1. Monitoring impact of the LLD Adam McLean, ORNL T. Gray, R. Maingi Lithium, TSG group preliminary research forum PPPL, B252 Nov. 23, 2009 NSTX Supported by College W&M Colorado Sch Mines Columbia U CompX General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U Old Dominion U ORNL PPPL PSI Princeton U Purdue U SNL Think Tank, Inc. UC Davis UC Irvine UCLA UCSD U Colorado U Illinois U Maryland U Rochester U Washington U Wisconsin Culham Sci Ctr U St. Andrews York U Chubu U Fukui U Hiroshima U Hyogo U Kyoto U Kyushu U Kyushu Tokai U NIFS Niigata U U Tokyo JAEA Hebrew U Ioffe Inst RRC Kurchatov Inst TRINITI KBSI KAIST POSTECH ASIPP ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep U Quebec

2. NSTX McLean Li TSGNov. 23, 2009 2 Monitoring the LLD: Regular ‘reference’ discharge Proposal: Perform a daily ‘reference’ discharge at the start of operations each run day –Daily reference shot (DRS) part of regular operations at DIII-D since 2006 Powerful tool for study of wall recycling, conditioning, edge parameters and their impact on plasma performance –LSN, includes L- and H-mode phases, tri. TBD –Provides important data for long-term observation of PSI phenomena –Particular motivation to do so in NSTX with the LLD Long fill-time may lead to significant long-term changes in surface chemistry/content, erosion, recycling, transport, etc. –Key candidate shots for modeling Many shots with similar parameters gives >> data to utilize

3. NSTX McLean Li TSGNov. 23, 2009 3 Monitoring the LLD: Regular spectroscopic observation Proposal: Regular observation of spectral emissions/regions with available spectrometers and related diagnostics –New divertor spectrometer, VIPS-1 and VIPS-2 Use one (or more) device nearly full-time on one spectral region of interest, e.g.: –430 nm region with simultaneous emissions from DI, CD, CII, LiI and LiII) –Regions where D 2, LiD, Li 2 emissions are sufficiently strong for detection, analysis –Compliment regular DI and HeII observations (Vlad) –SPRED –Filterscopes –…along with other typical diagnostics (CHERS, MPTS, IR, LPs, etc.) Provides detailed, long-term observations of edge processes as LLD is filled, enabling relation to plasma performance