Direct measurement of divertor exhaust neo enrichment in DIII-D
Conference
·
OSTI ID:383042
- Oak Ridge National Lab., TN (United States)
- Oak Ridge Associated Universities, Inc., TN (United States)
- Association Euratom-CEA, Centre d`Etudes de Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee
- Institut National de la Recherche Scientifique, Varennes, PQ (Canada)
- Lawrence Livermore National Lab., CA (United States)
We report first direct measurements of divertor exhaust gas impurity enrichment, {eta}{sub exh}=(exhaust impurity concentration){divided_by}(core impurity concentration), for both unpumped and D{sub 2} puff-with-divertor-pump conditions. The experiment was performed with neutral beam heated, ELMing H-mode, single-null diverted deuterium plasmas with matched core and exhaust parameters in the DIII-D tokamak. Neon gas impurity was puffed into the divertor. Neon density was measured in the exhaust by a specially modified Penning gauge and in the core by absolute charge exchange recombination spectroscopy. Neon particle accounting indicates that much of the puffed neon entered a temporary unmeasured reservoir, inferred to be the graphite divertor target, which makes direct measurements necessary to calculate divertor enrichments. D{sub 2} puff into the SOL (scrape-off layer) with pumping increased {eta}{sub exh} threefold over either unpumped conditions or D{sub 2} puff directly into the divertor with pumping. These results show that SOL flow plays an important role in divertor exhaust impurity enrichment.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; AC05-96OR22464; W-7405-ENG-48
- OSTI ID:
- 383042
- Report Number(s):
- GA--A22343; CONF-960569--12; ON: DE97000111
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiative and SOL experiments in open and baffled divertors on DIII-D
Modeling of DIII-D noble gas puff and pump experiments
Results from the DIII-D advanced divertor program
Conference
·
Sat Oct 31 23:00:00 EST 1998
·
OSTI ID:296835
Modeling of DIII-D noble gas puff and pump experiments
Conference
·
Fri Aug 01 00:00:00 EDT 1997
·
OSTI ID:510443
Results from the DIII-D advanced divertor program
Conference
·
Wed Mar 31 23:00:00 EST 1993
·
OSTI ID:10163604