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AbstractAbstract
[en] Confinement properties of a reversed field pinch (RFP), TPE-1RM20, are intensively presented. Plasma current, Ip, dependencies of confinement properties are particularly shown in comparison with the forerunner machine, TPE-1RM15. The results without any active density controls are presented in this paper. It is shown that both machines have almost the same, relatively high, I/N values (<= 12 x 10-14 Am) and the poloidal beta, Βp (= 0.1) and they do not change very much with Ip, where N is the column density. The energy confinement time, τE, linearly increases with Ip and the behavior of the resistive part of the loop voltage has an important role to the Ip dependence of τE. 8 refs., 3 figs
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6. international Toki conference on plasma physics and controlled nuclear fusion: Research for advanced concepts in magnetic fusion; Toki-city (Japan); 29 Nov - 2 Dec 1994; CONF-941182--
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AbstractAbstract
[en] A one-dimensional position sensing device is described which produces an electrical signal proportional to the position of maximum light intensity imaged upon its light detecting element. The device uses a segmented photodiode but the position resolution is significantly better than the segment width, which is the resolution that would be obtained using a purely digital circuit. The device is also quite fast with a delay plus rise time of about 50 nsec
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Journal Article
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Review of Scientific Instruments; v. 48(7); p. 778-782
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Quinn, W.E.; Bailey, A.G.; Chandler, G.I.; Hansborough, L.D.; Lillberg, J.W.; Machalek, M.D.; Seibel, F.T.
LASL Controlled Thermonuclear Research Program. Progress report, January--December 19741975
LASL Controlled Thermonuclear Research Program. Progress report, January--December 19741975
AbstractAbstract
[en] The Scylla IV-P is a flexible, linear experiment to support the toroidal Scyllac experiments and to investigate high-density, linear theta-pinch concepts. The experimental arrangement and construction status are described
Original Title
Experimental arrangement and construction status
Primary Subject
Source
Ribe, F.L. (comp.); Los Alamos Scientific Lab., N.Mex. (USA); p. 54-58; Aug 1975
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Report
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Progress Report
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McKenna, K.F.
Los Alamos Scientific Lab., N.Mex. (USA)1976
Los Alamos Scientific Lab., N.Mex. (USA)1976
AbstractAbstract
[en] Scylla I-C is a small scale (1-meter) research theta pinch developed for the experimental investigation of basic plasma physics processes and advanced concepts. The properties and stability characteristics of the Scylla I-C plasma, over a range of initial fill pressure from 100-500 mTorr D2, are discussed
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Aug 1976; 11 p; Available from NTIS. $3.50.
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Report
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Buffa, A.; Shchepetov, A.V.; Kuznetsov, A.B.
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
AbstractAbstract
No abstract available
Primary Subject
Source
Goutych, I.F.; Gresillon, D.; Sitenko, A.G.; AN Ukrainy, Kiev (Ukraine). Inst. Teoreticheskoj Fiziki; 488 p; 1996; p. 192; 23. European physical society conference on controlled fusion and plasma physics; Kyiv (Ukraine); 24-28 Jun 1996
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Miscellaneous
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AbstractAbstract
[en] In this paper, the effect of the conduction wall on reversed field pinch (RFP) plasma is modeled by a mean radial magnetic field Br < 0 or Br > 0, respectively, relevant to the experiments with insertion of limiters or removal of limiters. It is shown that when Br < 0, the mean magnetic field energy is converted into the mean velocity field energy, which is dissipated by the viscosity of ions and when Br > 0, the contrary is the case. In the former case, if the ion and electron thermal loss rates are unchanged, the electron temperature will decrease and the ion temperature, plasma resistance and loop voltage will increase. In the latter case, the magnetic energy is dissipated by the resistivity of electrons. As a result, the electron temperature increases and the ion temperature, plasma resistance and loop voltage decrease. Especially, when Br ≅ 0, the oscillations in the ion and electron temperatures, the plasma resistance and the loop voltage take place. (author)
Primary Subject
Source
Sugai, H. (Nagoya Univ. (Japan). Faculty of Engineering); Hayashi, T. (eds.); 2147 p; ISBN 4-9900586-1-5;
; ISBN 4-9900586-2-3;
; 1997; p. 1218-1221; ICPP96: 1996 international conference on plasma physics; Nagoya (Japan); 9-13 Sep 1996


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Book
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Hansborough, L.D.; Cole, T.R.; Commisso, R.J.; Williamson, K.D. Jr.
Los Alamos Scientific Lab., N.Mex. (USA)1977
Los Alamos Scientific Lab., N.Mex. (USA)1977
AbstractAbstract
[en] Scylla IV-P is a 5-m linear theta pinch at the Los Alamos Scientific Laboratory primarily used to study end effects of linear theta-pinch plasmas. One method that may be used to reduce plasma end loss from linear theta pinches is to insert material end plugs. Two different assemblies that insert end plugs have been fabricated and installed on Scylla IV-P. The presence of the material end plugs have been found to increase the plasma confinement time by 20 to 30 percent; the plasma stability is increased (the m = 1 wobble is suppressed), and the neutron production is not degraded. The design of the end plug insertion mechanisms is described in some detail and information is presented on end plug erosion. Material eroded from the end plug must be either removed by the vacuum system or it plates out on the vacuum system surfaces. A condensed gas end plug has been proposed to eliminate problems associated with ablated solid material; a third end plug assembly for this is being designed which inserts a cryostat coated with a condensed gas. A prototype of this cryogenically cooled end plug (cryo-plug) has been fabricated and tested. These data are presented and the insertion mechanism described
Primary Subject
Source
1977; 5 p; 7. symposium on fusion research project; Knoxville, TN, USA; 25 - 29 Oct 1977; CONF-771029--27; Available from NTIS., PC A02/MF A01
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Report
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AbstractAbstract
[en] New data from the Reversed Field eXperiment (RFX) are presented and analysed, which provide a deeper understanding of pellet experiments in a reversed field pinch. In particular, evidence on the ablation cloud density, ablation rate and homogenization process are given by the measurements of two mid-infra-red interferometers located at different toroidal locations, one of which is at the same poloidal plane as the pellet injector. For each pellet, the measurement of the latter interferometer displays a huge peak, which is due to the crossing of the interferometer chord by the ablation cloud. Its analysis yields information on the cloud dimension and radial density distribution. The typical cloud density is much lower than that measured in tokamaks. Due to such a low density, the stopping power of the ionized part of the ablation cloud is weak. As a result the ablation rate is higher than in tokamaks. Another characteristic of the density increase measured by both of the interferometers is the absence of dense plasma structures propagating for long distances along field lines. This proves that the distance necessary for the ablated material to become incorporated into the plasma is less than about 4 m in the core of the discharge, due to a rapid mixing of the ablated material. Despite the different features displayed by pellet injection experiments in reversed-field pinches and tokamaks, the ablation and homogenization of the deposited material can be described within the same general frame for both magnetic configurations. The differences arise mainly because of the different magnetic field topologies and values of the transport coefficients in the two machines. (author)
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Available online at the Web site for the journal Plasma Physics and Controlled Fusion (ISSN 1361-6587) http://www.iop.org/; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Plasma Physics and Controlled Fusion; ISSN 0741-3335;
; v. 43(3); p. 225-248

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Zanca, P.; Terranova, D.; Valisa, M.; Dal Bello, S., E-mail: paolo.zanca@igi.cnr.it2007
AbstractAbstract
[en] A cross-check analysis of the plasma wall interaction in RFX-mod is presented. Different methods to determine the footprint of the interaction are compared. The issue is particularly important for the plasma performances, due to the presence of a quasi-stationary distortion of the plasma surface related to the phase locking of the dynamo modes. We show a good agreement between the different analysis and an important reduction of the phenomenon in the discharges with active feedback control of the magnetic boundary
Primary Subject
Source
17. International conference on plasma-surface interactions in controlled fusion devices; Hefei, Anhui (China); 22-26 May 2006; S0022-3115(07)00128-6; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] The results leading to the identification of coherent structures emerging from the background turbulence in the edge region of the reversed field pinch experiments EXTRAP-T2R and RFX are reviewed. These structures have traits of vortices in velocity field and blobs in density, and the reconstruction of their spatial structure and of their time evolution is discussed focusing on the analysis tools applied. The role of these structures in the particle anomalous transport is addressed, showing that their collisions can contribute up to 50% the total particle losses. This process is shown to be responsible for bursts in particle flux and it is found to set a characteristic collision time, which is in agreement with the statistical properties of laminar times for particle flux bursts
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3. Nordic Symposium on Plasma Physics; Oslo (Norway); 4-7 Oct 2004; Available from DOI: http://dx.doi.org/10.1088/0031-8949/2006/T122/002; 39 refs., 6 figs.
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Journal Article
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Physica Scripta. T; ISSN 0281-1847;
; v. 122; p. 1-7

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