Advances in radiated power control at DIII-D

被引：29

作者：

Eldon, D. ^{[1
,2
]}

Kolemen, E. ^{[2
]}

Humphreys, D. A. ^{[1
]}

Hyatt, A. W. ^{[1
]}

Jarvinen, A. E. ^{[3
]}

Leonard, A. W. ^{[1
]}

McLean, A. G. ^{[3
]}

Moser, A. L. ^{[1
]}

Petrie, T. W. ^{[1
]}

Walker, M. L. ^{[1
]}

机构：

[1] Gen Atom, POB 85608, San Diego, CA 92186 USA

[2] Princeton Univ, Princeton, NJ 08544 USA

[3] Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA

来源：

NUCLEAR MATERIALS AND ENERGY | 2019年 / 18卷

关键词：

Plasma control; Radiation; Tokamak; Fusion; Divertor; DIVERTOR; DISCHARGES;

D O I：

10.1016/j.nme.2019.01.010

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Feedback control of radiated power from the lower divertor P-rad,P- (div,) (L) has been implemented in the DIII-D Plasma Control System (PCS). A realtime sensor for P-rad,P- (div,) (L )has been constructed from 12 foil bolometer channels which agrees with standard post-shot analysis to within 20%. Results with the 12-channel sensor are compared to initial proof-of-concept tests with a single channel as a proxy for P-rad,P- (div,) (L )showing that the upgraded sensor is necessary to overcome limitations of the proxy channel strategy in DIII-D. Using N-2 seeding under feedback control, P-rad,P- (div,) (L )has been increased by up to 150% above unseeded levels, and a radiated power fraction f(rad) of 80% has been demonstrated, although feedback controlled gas flow is steadier at f(rad) = 55%. Spatial coverage is broad enough to enable P-ra(d) control during the strike point sweeps which are commonly used to generate pseudo-2D divertor Thomson measurements in DIII-D divertor experiments. Use of this control reveals challenges that may affect next step devices, which will require actively controlled extrinsic impurity seeding in order to manage heat loads. When operating at high f(rad), changes in pedestal T-e (caused by ELMs in these experiments but could come from other disturbances) resulted in large perturbations to P-rad which were destabilizing to the feedback controller.

引用

页码：285 / 290

页数：6

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