Real-time wall conditioning by controlled injection of boron and boron nitride powder in full tungsten wall ASDEX Upgrade

被引：52

作者：

Bortolon, A. ^{[1
]}

Rohde, V ^{[2
]}

Maingi, R. ^{[1
]}

Wolfrum, E. ^{[2
]}

Dux, R. ^{[2
]}

Herrmann, A. ^{[2
]}

Lunsford, R. ^{[1
]}

McDermott, R. M. ^{[2
]}

Nagy, A. ^{[1
]}

Kallenbach, A. ^{[2
]}

Mansfield, D. K. ^{[1
]}

Nazikian, R. ^{[1
]}

Neu, R. ^{[2
]}

机构：

[1] Princeton Plasma Phys Lab, 100 Stellarator Rd,POB 241, Princeton, NJ 08543 USA

[2] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany

来源：

NUCLEAR MATERIALS AND ENERGY | 2019年 / 19卷

关键词：

HIGH-CONFINEMENT; BORONIZATION;

D O I：

10.1016/j.nme.2019.03.022

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：

In ASDEX Upgrade with full-tungsten wall, boronization is an important tool to control tungsten sources and allow reliable operation at low collisionality. The duration of the beneficial effects is limited by the erosion of the boron layer, in particular on the tungsten ion-cyclotron antenna limiters. We report results from experiments exploring injection boron-rich powders in tokamak plasmas as a way to replenish boron coating and extend the lifetime of boronization effects. Pure boron and boron nitride powders were introduced gravitationally in plasma discharges at rates up to 60 mg/s for durations up to 3 s. Boron injection with cumulative amounts >100 mg appeared to improve wall conditions similarly to boronization, with indications of reduced influx of oxygen and tungsten from the antenna limiter. Moreover, cumulative injection of 340 mg of B appeared sufficient to enable successful execution of low collisionality scenarios critically relying on freshly boronized walls.

引用

页码：384 / 389

页数：6

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