Evaluation of neutron spectrometer techniques for ITER using synthetic data

被引:9
|
作者
Sunden, E. Andersson [1 ]
Ballabio, L. [2 ,3 ]
Cecconello, M. [1 ]
Conroy, S. [1 ]
Ericsson, G. [1 ]
Johnson, M. Gatu [1 ]
Gorini, G. [2 ,3 ]
Hellesen, C. [1 ]
Ognissanto, F. [2 ,3 ]
Ronchi, E. [1 ]
Sjoestrand, H. [1 ]
Tardocchi, M. [2 ,3 ]
Weiszflog, M. [1 ]
机构
[1] EURATOM VR Assoc, Dept Phys & Astron, Uppsala, Sweden
[2] EURATOM ENEA CNR Assoc, Ist Fis Plasma, Milan, Italy
[3] CNR CNISM, Milan, Italy
来源
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2013年 / 701卷
关键词
Neutron spectroscopy; Neutron spectrometry; ITER; High resolution neutron spectrometer; Time resolution; DT PLASMAS; ENERGY RESOLUTION; EMISSION; JET; SPECTRA; DESIGN;
D O I
10.1016/j.nima.2012.10.041
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A neutron spectrometer at ITER is expected to provide estimates of plasma parameters such as ion temperature, T-i, fuel ion ratio, n(t)/n(d), and Q(thermal)/Q(tot), with 10-20% precision at a time resolution, Delta t, of at least 100 ms. The present paper describes a method for evaluating different neutron spectroscopy techniques based on their instrumental response functions and synthetic measurement data. We include five different neutron spectrometric techniques with realistic response functions, based on simulations and measurements where available. The techniques are magnetic proton recoil, thin-foil proton recoil, gamma discriminating organic scintillator, diamond and time-of-flight. The reference position and line of sight of a high resolution neutron spectrometer on ITER are used in the study. ITER plasma conditions are simulated for realistic operating scenarios. The ITER conditions evaluated are beam and radio frequency heated and thermal deuterium-tritium plasmas. Results are given for each technique in terms of the estimated time resolution at which the parameter determination can be made within the required precision (here 10% for T-i and the relative intensities of NB and RF emission components). It is shown that under the assumptions made, the thin-foil techniques out-perform the other spectroscopy techniques in practically all measurement situations. For thermal conditions, the range of achieved Delta t in the determination of T-i varies in time scales from ms (for the magnetic and thin-foil proton recoil) to s (for gamma discriminating organic scintillator). (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:62 / 71
页数:10
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