Title: Test of bootstrap current models using high-β_p EAST-demonstration plasmas on DIII-D

Abstract

Magnetic measurements together with kinetic profile and motional Stark effect measurements are used in full kinetic equilibrium reconstructions to test the Sauter and NEO bootstrap current models in a DIII-D high-$${{\beta}_{\text{p}}}$$ EAST-demonstration experiment. This aims at developing on DIII-D a high bootstrap current scenario to be extended on EAST for a demonstration of true steady-state at high performance and uses EAST-similar operational conditions: plasma shape, plasma current, toroidal magnetic field, total heating power and current ramp-up rate. It is found that the large edge bootstrap current in these high-$${{\beta}_{\text{p}}}$$ plasmas allows the use of magnetic measurements to clearly distinguish the two bootstrap current models. In these high collisionality and high-$${{\beta}_{\text{p}}}$$ plasmas, the Sauter model overpredicts the peak of the edge current density by about 30%, while the first-principle kinetic NEO model is in close agreement with the edge current density of the reconstructed equilibrium. Furthermore, these results are consistent with recent work showing that the Sauter model largely overestimates the edge bootstrap current at high collisionality.

Authors:

Ren, Qilong ^[1]; Lao, Lang L. ^[2]; Garofalo, Andrea M. ^[2]; Holcomb, Christopher T. ^[3]; Solomon, Wayne M. ^[4]; Belli, Emily A. ^[2]; Smith, Sterling P. ^[2]; Meneghini, Orso ^[2]; Qian, Jinping ^[1]; Li, Guoaqiang ^[1]; Wan, Boanian ^[1]; Ding, Siye ^[1]; Gong, Xianzu ^[1]; Xu, G. ^[1]

---

+ Show Author Affiliations

1. Chinese Academy of Sciences, Hefei (People's Republic of China)
2. General Atomics, San Diego, CA (United States)
3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Publication Date:

Mon Jan 12 00:00:00 EST 2015

Research Org.:

General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:

National Magnetic Confinement Fusion Program of China; USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1367537

Alternate Identifier(s):

OSTI ID: 1769155

Report Number(s):

LLNL-JRNL-752084
Journal ID: ISSN 0741-3335

Grant/Contract Number:  

FC02-04ER54698; FG02-95ER54309; AC52-07NA27344; AC02-09CH11466

Resource Type:

Accepted Manuscript

Journal Name:

Plasma Physics and Controlled Fusion

Additional Journal Information:

Journal Volume: 57; Journal Issue: 2; Journal ID: ISSN 0741-3335

Publisher:

IOP Science

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high poloidal beta; kinetic equilibrium reconstruction; bootstrap current