Zobrazeno 1 - 10
of 34
pro vyhledávání: '"J. A. C. Cabral"'
Autor:
Ricardo Magnus Osorio Galvao, Carlos A. Silva, I. S. Nedzelskiy, H. F. C. Figueiredo, J. A. C. Cabral, C.A.F. Varandas
Publikováno v:
Nuclear Fusion. 44:799-810
Edge polarization experiments were carried out on ISTTOK using an emissive electrode. The dependence of the bias current on the radial electric field, measured by a radial array of Langmuir probes, is in qualitative agreement with the expression deri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e42b3a8bb334af5f9ad3e7ec4e0a34a
https://doi.org/10.1088/0029-5515/44/7/012
https://doi.org/10.1088/0029-5515/44/7/012
Autor:
B. Gonçalves, C.A.F. Varandas, A.V. Melnikov, J. A. C. Cabral, S. V. Perfilov, I. Nedzelsky, L. I. Krupnik, O. A. Yudina, L.G. Eliseev, A. Malaquias
Publikováno v:
Review of Scientific Instruments. 74:1857-1860
In this article, we address the major physics principles and the engineering issues associated with the implementation of a heavy ion beam diagnostic for the International Tokamak Experiment Reactor (ITER) for the edge measurements of the plasma elec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05bc44ad5c83325a8c45c2ec530b8410
https://doi.org/10.1063/1.1538507
https://doi.org/10.1063/1.1538507
Autor:
A. D. Komarov, L. I. Krupnik, C. A. F. Varandas, A. Malaquias, A. L. Kozachok, J. A. C. Cabral, B. Gonçalves, I. S. Bondarenko, S. M. Khrebtov, I. S. Nedzelskiy
Publikováno v:
Review of Scientific Instruments. 74:1853-1856
The initial injection system of the heavy-ion-beam diagnostic (HIBD) of the tokamak ISTTOK provides a 2 mm diameter and 3.6 mrad divergence beam of Cs+ or Xe+ ions, after extraction from a plasma ion source and acceleration up to 20 keV by a gap lens
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24c35b89efd0de1c6c0a1df4ccf10ccb
https://doi.org/10.1063/1.1538342
https://doi.org/10.1063/1.1538342
Autor:
C. A. F. Varandas, Milan Tichý, Horacio Fernandes, J. Stöckel, G. Van Oost, J. A. C. Cabral, H. F. C. Figueiredo, C. Ioniţă, J. Adamek, Martin Hron, Emilio Martines, P. Balan, Roman Schrittwieser
Publikováno v:
Review of Scientific Instruments. 74:1583-1587
The plasma potential Φpl and its fluctuations Φpl were measured by electron emissive probes in the edge plasma regions of two fusion experiments: the Instituto Superior Tecnico Tokamak (ISTTOK) (Lisbon, Portugal), and the Czech Academy of Sciences
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b37f1c19fa6d7a58466bb50ca9185bd
https://doi.org/10.1063/1.1527258
https://doi.org/10.1063/1.1527258
Publikováno v:
Review of Scientific Instruments. 74:2071-2074
A high dispersion, multichannel, visible spectrometer has been developed for the ISTTOK tokamak, aiming at measuring the evolution of both the edge ion temperature and plasma poloidal velocity, by analysis of a CIII spectral line. It is based on a do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::901518307898f297bf0b6812c766a996
https://doi.org/10.1063/1.1537039
https://doi.org/10.1063/1.1537039
Publikováno v:
Review of Scientific Instruments. 74:1807-1810
Measurements of the electron temperature using standard diagnostics, like electron cyclotron emission or soft x-ray diagnostics, tend to be inadequate due to the natural limitations of these methods at low-toroidal magnetic field (B0⩽0.5 T) and pla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41943c7c9b115372434308f452201a3f
https://doi.org/10.1063/1.1538366
https://doi.org/10.1063/1.1538366
Publikováno v:
Plasma Physics and Controlled Fusion. 44:2021-2031
Low plasma density discharges at high longitudinal electric fields (E0≥1 V m-1) in the ISTTOK tokamak revealed characteristic features for the runaway (RA) generation process. The increase in soft x-ray emission was detected at the onset of the RA
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c4469aac6264d6dd0eb503610b1719cd
https://doi.org/10.1088/0741-3335/44/9/316
https://doi.org/10.1088/0741-3335/44/9/316
Autor:
C.A.F. Varandas, F. Serra, Horacio Fernandes, P. Belo, Franciscarlos Gomes da Silva, P Malinov, J. A. C. Cabral, M. P. Alonso, Roberta Lima Gomes, R Canário, Amílcar Soares, A. Malaquias
Publikováno v:
Plasma Physics and Controlled Fusion. 40:1001-1019
Experimental results concerning the plasma response to the biasing of the tokamak ISTTOK localized limiters, on a strong flat-top plasma current reference discharge, are reported. Modifications of central beta as well as of energy confinement time ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e075ba40d46a49f747e6dca282db65b
https://doi.org/10.1088/0741-3335/40/6/008
https://doi.org/10.1088/0741-3335/40/6/008
Autor:
Amílcar Soares, Horacio Fernandes, P. H. M. Vaessen, J. A. C. Cabral, P. Belo, A. Malaquias, J Pires, C.A.F. Varandas, Carlos A. Silva, Jorge Ferreira, Roberta Lima Gomes, João M. C. Sousa, A Praxedes, M. P. Alonso, C. J. Freitas, R Canário
Publikováno v:
Plasma Physics and Controlled Fusion. 38:51-70
This paper describes the temporal evolution of the major internal plasma parameters during a complete sawtooth cycle of the tokamak ISTTOK discharges, with emphasis on the time-resolved determination of the plasma density profile by heavy-ion beam pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f3bb90a8c3cf4533ee25b4c3e89c7c3
https://doi.org/10.1088/0741-3335/38/1/002
https://doi.org/10.1088/0741-3335/38/1/002
Autor:
B. Gonçalves, L A Pereira, J. A. C. Cabral, S. M. Khrebtov, L. I. Krupnik, I. S. Nedzelskiy, C. A. F. Varandas, A. Malaquias, Carlos A. Silva, N. B. Dreval, J. L. dePablos, C. Hidalgo
Publikováno v:
Review of Scientific Instruments. 75:3511-3513
A multiple cell array detector (MCAD) has been developed to investigate the spatial structure of plasma turbulence in fusion plasmas. This system is expected to provide simultaneous measurements of edge and core density fluctuations with both tempora
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3df6c30b0519cfdf5b136d1e7dcd0fb
https://doi.org/10.1063/1.1785276
https://doi.org/10.1063/1.1785276