On the measurement of the threshold electric field for runaway electron generation in the Frascati Tokamak Upgrade

被引：18
|
作者：
Popovic, Z. [1 ]
Esposito, B. [2 ]
Martin-Solis, J. R. [1 ]
Bin, W. [3 ]
Buratti, P. [2 ]
Carnevale, D. [4 ]
Causa, F. [2 ]
Gospodarczyk, M. [4 ]
Marocco, D. [2 ]
Ramogida, G. [2 ]
Riva, M. [2 ]
机构：
[1] Univ Carlos III Madrid, Ave Univ 30, Madrid 28911, Spain
[2] ENEA Unita Tecn Fus, Via E Fermi 45, I-00044 Rome, Italy
[3] Ist Fis Plasma CNR, Via R Cozzi 53, I-20125 Milan, Italy
[4] Univ Roma Tor Vergata, Dip Ingn Civile & Informat DICII, Via Politecn 1, I-00133 Rome, Italy
来源：
PHYSICS OF PLASMAS | 2016年 / 23卷 / 12期
关键词：
SYNCHROTRON-RADIATION; FLUCTUATIONS; DIFFUSION; TRANSPORT; DYNAMICS;
D O I：
10.1063/1.4968839
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Experiments have been carried out to evaluate the threshold electric field for runaway generation during the flat-top phase of ohmic discharges in the Frascati Tokamak Upgrade tokamak. An investigation of the conditions for runaway electron generation and suppression has been performed for a wide range of plasma parameter values. The measured threshold electric field is found to be significantly larger (similar to 2 - 5 times) than predicted by the relativistic collissional theory of runaway generation, E-R = n(e) e(3) ln Lambda/4 pi e(0)(2) m(e) c(2), and can be explained to a great extent by an increase of the critical electric field due to the effect of the electron synchrotron radiation losses. These findings are consistent with the results of an ITPA joint experiment to study the onset, growth, and decay of relativistic runaway electrons [Granetz et al., Phys. Plasmas 21, 072506 (2014)]. Confirmation of these results for disruptions with high electric field might imply significantly lower requirements on electron densities for suppression and prevention of runaway formation in ITER. Published by AIP Publishing.
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页数：9
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