TJ-I

The TJ-I tokamak was the first magnetic confinement device at CIEMAT (then JEN). Its name is an abbreviation for 'Tokamak de la Junta' (de Energía Nuclear, i.e., JEN) number I. It started operation in 1983, and has been operational until 1995. Ohmic heating was used.

TJ-I at the end of its life

This device has been the subject of many research programmes dedicated to the study of physical processes in tokamak plasmas:

basic confinement studies (transport, electric fields, isotope effect)
edge physics
turbulence studies (driving mechanisms, turbulent transport)
plasma-wall interaction (carbonization, boronization)
diagnostic development (microwave reflectometry, radiation detectors, probes, atomic beams,...)

Parameter	Value	Unit
Major radius, R₀:	0.30	m
Mean plasma radius, a:	0.10	m
Plasma current, I_p:	30	kA
Toroidal field, B_T:	1.0 - 1.4	T
Electron density, n_e:	1.3 10¹⁹	m^-3

External links

TJ-I

References

B. Zurro, C. Pardo and J.L. Alvarez Rivas, A study of the bolometric capabilities of quartz for hot plasmas, J. Physics D: Applied Phys 19 (1986) 1895
E. Anabitarte, E.G. Bustamante, M.A.G. Calderon, J.M. Senties, A.P. Navarro and J. Sánchez, Determination of the electron density profile and its fluctuations by broad-band microwave reflectometry in the TJ-1 tokamak, J. Phys. D.: Appl. Phys. 21 (1988a) 1384
B. Zurro, B. García-Castañer, C. Hidalgo, S. Pérez, and L. Pallás, Simple ion temperature diagnostics for a short tokamak discharge, Rev. Sci. Instrum. 59 (1988) 1509
B. Zurro, C. Pardo and F. Mompean, Observation of neoclassical particle confinement behaviour in the low field Tokamak TJ-1, Plasma Phys. Control Fusion '30 (1988) 1767
M.A. Ochando, A.P. Navarro, J.A. Vega, Feasibility of local power losses determination in the TJ-II heliac using movable bolometers, IEEE Trans. on Plasma Science 17 (1989) 316
T. Estrada, J. Sánchez, B. Brañas, and A. P. Navarro, Broadband homodyne reflectometer devoted to density fluctuation measurements, Rev. Sci. Instrum. 61 (1990) 3034
C. Hidalgo, M.A. Pedrosa, A. Navarro, F.L. Tabarés, E. Ascasíbar, F. Pérez Murano, Electrostatic and magnetic turbulence in the TJ-I tokamak, Nucl. Fusion 30 (1990) 717
J. Sánchez, H.J. Hartfuss, E. Anabitarte, et al., Nucl. Fusion 30 (1990) 2383
F.L. Tabares, B. Garcia-Castañer, M. Liniers, N. Lorente, TJ-I team and J. Hackman, Global particle balance in the TJ-I tokamak, Vacuum 41 (1990) 1519
F.L. Tabares, M.A. Pedrosa, D. Tafalla, C. Pardo, E. De la Cal and J. Sanchez, Edge plasma asymmetries in the TJ-I tokamak, J. Nuclear Materials 176-177 (1990) 899
J. Vega, Code for time-resolved X-ray pulse analysis at high count rates for short tokamak discharges, Rev. of Sci. Instrum. 61 (1990) 3268
B. Zurro, C. Hidalgo, B. Garcia-Castañer and C. Pardo, Observation of thermal decoupling of highly ionized impurities and protons in the TJ-I tokamak and its interpretation, Plasma Phys. Control. Fusion 32 (1990) 565
B. Zurro, A broadband plasma radiation detector with spatial resolution based on the optical scanning of the fluorescence of a phosphor, Rev. Sci. Instrum. 62 (1991) 118
R. Balbín, C. Hidalgo, M. A. Pedrosa, I. García-Cortés, and J. Vega, Measurement of density and temperature fluctuations using a fast swept Langmuir probe, Rev Sci Instrum 63 (1992) 4605
I. García-Cortés, M.A. Pedrosa, C. Hidalgo, B. Brañas, T. Estrada, R. Balbín, E. de la Luna, J. Sánchez, and A.P. Navarro, Electrostatic and magnetic fluctuations in the proximity of the velocity shear layer in the TJ-I tokamak, Phys. Fluids B 4 (1992) 4007
C. Hidalgo, R. Balbín, M. A. Pedrosa, I. García-Cortés, and M. A. Ochando, Experimental evidence of significant temperature fluctuations in the plasma edge region of the TJ-I tokamak, Phys. Rev. Lett 69 (1992) 1205
E. Iborra, A. Sanz-Hervás, T. Rodríguez, M.A. Ochando, and A.P. Navarro, High sensitivity bolometers development, Rev. Sci. Instrum 63 (1992) 4708
J. Sánchez, B. Brañas, T. Estrada, E. de la Luna, and V. Zhuravlev, Amplitude modulation reflectometry for large fusion devices, Rev. Sci. Instrum. 63 (1992) 4654
B. Zurro, J. Vega, F. Castejón, and C. Burgos, Role of nonthermal velocity fluctuations on anomalous impurity heating in the TJ-I tokamak, Phys. Rev. Lett. 69 (1992) 2919
M.A. Ochando, M.A. Pedrosa, R. Balbín, I. García-Cortés, and C. Hidalgo, Edge turbulence and total radiation in the TJ-I tokamak, Phys. Fluids B 5, 11 (1993) 4051
J. Sanchez, B. Brañas, E. de la Luna, and T. Estrada, Swept frequency reflectometer for correlation studies in the TJ-I tokamak, Rev. Sci. Instrum. 64 (1993) 487
B. Zurro, C. Burgos, L. Pacios, J. Vega and A. Rodriguez-Yunta, A study of impurity rotation behaviour in the TJ-I tokamak, Plasma Phys. Control. Fusion 35 (1993) 349
L. Rodriguez-Rodrigo, A. Rodriguez-Yunta, F. Castejon, J. Vega, C. Pardo and A.P. Navarro, Runaway transport studies in the TJ-I tokamak, Nucl. Fusion 34 (1994) 649
J. Sánchez, B. Brañas, E. de la Luna, et al., Plasma Physics Reports 20 (1994) 1
B. Zurro and B. García-Castañer, A VUV filter spectrometer with spatial resolution and its plasma diagnostic capabilities, Rev. Sci. Instrum. 65 (1994) 2580
C. Hidalgo, R. Balbín, B. Brañas, T. Estrada, I. García-Cortés, M.A. Pedrosa, E. Sánchez and B. van Milligen, Nonlinear phenomena and plasma turbulence in fusion plasmas, Physica Scripta 51 (1995) 624
C. Hidalgo, Edge turbulence and anomalous transport in fusion plasmas, Plasma Phys. Control. Fusion 37 (1995) A53
K.J. McCarthy, B. Zurro, C. Burgos, J. Vega, and A. Portas, Investigation of C V line ratio variations in a tokamak with an application to neutral hydrogen measurement, Phys. Rev. E 52 (1995) 6671
M.A. Pedrosa, I. García-Cortés, B. Brañas, R. Balbín, C. Hidalgo, L. Schmitz, G. Tynan, and A. Post-Zwicker, On the influence of atomic physics mechanisms on edge plasma turbulence in the TJ-I and Princeton Beta Experiment-Modified tokamaks, Phys. Plasmas 2 (1995) 2618
L. Rodríguez-Rodrigo and F. Castejón, Characterization of Magnetic Turbulence in Tokamak Plasmas through Hard X-Ray Spectra, Phys. Rev. Lett. 74 (1995) 3987
F.L. Tabarés, E. de la Cal, D. Tafalla, R. Balbín, T. Estrada, I. García-Cortés, M. A. Ochando, M. A. Pedrosa and B. Zurro, Boronization of the TJ-I tokamak by trimethylboron and decaborane, J. of Nucl. Mater. 220 (1995) 688
B.A. Carreras, C. Hidalgo, E. Sánchez, M.A. Pedrosa, R. Balbín, I. García-Cortés, B. van Milligen, D.E. Newman, and V.E. Lynch, Fluctuation-induced flux at the plasma edge in toroidal devices, Phys. Plasmas 3 (1996) 2664
C. Pardo, A. Rodriguez-Yunta, J. Vega, B. Branas, T. Estrada, M.A. Ochando, F.L. Tabares and B. Zurro, Transport studies in the TJ-I tokamak from steady and perturbative methods, Nucl. Fusion 96 (1996) 953