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Title: TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK

Abstract

A271 TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK. Intermittent plasma objectives (IPOs) featuring higher pressure than the surrounding plasma, are responsible for {approx} 50% of the E x B{sub T} radial transport in the scrape off layer (SOL) of the DIII-D tokamak in L- and H-mode discharges. Conditional averaging reveals that the IPOs are positively charged and feature internal poloidal electric fields of up to 4000 V/m. The IPOs move radially with E x B{sub T}/B{sup 2} velocities of {approx} 2600 m/s near the last closed flux surface (LCFS), and {approx} 330 m/s near the wall. The IPOs slow down as they shrink in radial size from 4 cm at the LCFS to 0.5 cm near the wall. The skewness (i.e. asymmetry of fluctuations from the average) of probe and beam emission spectroscopy (BES) data indicate IPO formation at or near the LCFS and the existence of positive and negative IPOs which move in opposite directions. The particle content of the IPOs at the LCFS is linearly dependent on the local density and decays over {approx} 3 cm into the SOL while their temperature decays much faster ({approx} 1 cm).

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
(US)
OSTI Identifier:
813999
DOE Contract Number:  
AC03-99ER54463
Resource Type:
Conference
Resource Relation:
Conference: THIS IS A PREPRINT OF A PAPER TO BE PRESENTED AT THE 44TH ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS, ORLANDO, FL (US), 11/11/2002--11/15/2002; Other Information: PBD: 1 Nov 2002
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASYMMETRY; DISTRIBUTION; DOUBLET-3 DEVICE; ELECTRIC FIELDS; EMISSION SPECTROSCOPY; FLUCTUATIONS; MAGNETIC SURFACES; PHYSICS; PLASMA; PROBES; SOLS; STATISTICS; TRANSPORT

Citation Formats

BOEDO, JA, RUDAKOV, DL, MOYER, RA, MCKEE, GR, COLCHIN, RJ, SCHAFFER, MJ, STANGEBY, PG, WEST, WP, ALLEN, SL, EVANS, TE, FONCK, RJ, HOLLMANN, EM, KRASHENINNIKOV, S, LEONARD, AW, NEVINS, W, MAHDAVI, MA, PORTER, GD, TYNAN, GR, WHYTE, DG, and XU, X. TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK. United States: N. p., 2002. Web.
BOEDO, JA, RUDAKOV, DL, MOYER, RA, MCKEE, GR, COLCHIN, RJ, SCHAFFER, MJ, STANGEBY, PG, WEST, WP, ALLEN, SL, EVANS, TE, FONCK, RJ, HOLLMANN, EM, KRASHENINNIKOV, S, LEONARD, AW, NEVINS, W, MAHDAVI, MA, PORTER, GD, TYNAN, GR, WHYTE, DG, & XU, X. TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK. United States.
BOEDO, JA, RUDAKOV, DL, MOYER, RA, MCKEE, GR, COLCHIN, RJ, SCHAFFER, MJ, STANGEBY, PG, WEST, WP, ALLEN, SL, EVANS, TE, FONCK, RJ, HOLLMANN, EM, KRASHENINNIKOV, S, LEONARD, AW, NEVINS, W, MAHDAVI, MA, PORTER, GD, TYNAN, GR, WHYTE, DG, and XU, X. 2002. "TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK". United States. https://www.osti.gov/servlets/purl/813999.
@article{osti_813999,
title = {TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK},
author = {BOEDO, JA and RUDAKOV, DL and MOYER, RA and MCKEE, GR and COLCHIN, RJ and SCHAFFER, MJ and STANGEBY, PG and WEST, WP and ALLEN, SL and EVANS, TE and FONCK, RJ and HOLLMANN, EM and KRASHENINNIKOV, S and LEONARD, AW and NEVINS, W and MAHDAVI, MA and PORTER, GD and TYNAN, GR and WHYTE, DG and XU, X},
abstractNote = {A271 TRANSPORT BY INTERMITTENCY IN THE BOUNDARY OF THE DIII-D TOKAMAK. Intermittent plasma objectives (IPOs) featuring higher pressure than the surrounding plasma, are responsible for {approx} 50% of the E x B{sub T} radial transport in the scrape off layer (SOL) of the DIII-D tokamak in L- and H-mode discharges. Conditional averaging reveals that the IPOs are positively charged and feature internal poloidal electric fields of up to 4000 V/m. The IPOs move radially with E x B{sub T}/B{sup 2} velocities of {approx} 2600 m/s near the last closed flux surface (LCFS), and {approx} 330 m/s near the wall. The IPOs slow down as they shrink in radial size from 4 cm at the LCFS to 0.5 cm near the wall. The skewness (i.e. asymmetry of fluctuations from the average) of probe and beam emission spectroscopy (BES) data indicate IPO formation at or near the LCFS and the existence of positive and negative IPOs which move in opposite directions. The particle content of the IPOs at the LCFS is linearly dependent on the local density and decays over {approx} 3 cm into the SOL while their temperature decays much faster ({approx} 1 cm).},
doi = {},
url = {https://www.osti.gov/biblio/813999}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {11}
}

Conference:
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