View source for TJ-IU

[[File:TJ-IU.JPG|300px|thumb|right|The TJ-IU Torsatron]]

In the torsatron TJ-IU, a single coil generates the helicoidal magnetic field (''l''=1). 
The number of turns of the coil around the vacuum chamber is ''m''=6.
The vertical field is generated by a set of vertical field coils.

The name 'TJ-IU' arises as this machine was an upgrade ('U') of the [[TJ-I]] device, in the sense that much auxiliary equipment from the latter was reused to operate TJ-IU.

{| class="wikitable"  align="center" border="1"
!''Parameter''                           !!''Value''!!''Unit''
|-
|Major radius, ''R<sub>0</sub>'':          ||  0.60  || m  
|-
|Mean plasma radius, ''a'':          ||  0.10  || m  
|-
|Minor coil radius, ''R<sub>c</sub>'':          ||  0.24  || m  
|-
|Number of periods, ''m'':          ||  6  ||   
|-
|Rotational transform at the axis, ''&iota;<sub>0</sub>'':          ||  0.30  ||  
|-
|Magnetic shear:          ||  almost zero  ||  
|-
|Magnetic well depth:          ||  6.9  || %  
|-
|Magnetic ripple at the axis:          ||  7.6  || %  
|-
|Helical axis elongation:          ||  0.025  || m  
|-
|Toroidal field, ''B<sub>T</sub>'', at &phi;=30 degrees:          ||  0.5  || T  
|-
|2<sup>nd</sup> harmonic Electron Cyclotron Heating, 28 - 37.5 GHz:          ||  200  || kW  
|}

[[File:Camera_TJ-IU.jpg|300px|thumb|left|The making of the TJ-IU vacuum vessel]]

The device was entirely built in Spain and taken into operation in 1994.
In 1999, the device was sent to the University of Kiel, Germany, under a permanent loan agreement, and renamed [[TJ-K]].
Currently, TJ-K is located at the [http://www.ipf.uni-stuttgart.de/index_e.html University of Stuttgart] in Germany.

== External links ==

* [http://www-fusion.ciemat.es/InternalReport/fusion_1989.pdf STORM: Proposal for upgrading of the TJ-I tokamak to a torsatron device] - internal report
* [http://www-fusion.ciemat.es/New_fusion/en/TJII/TJIU/TJIU.shtml TJ-IU] - old web page

== References ==

* L. Pacios, J. Guasp, and J. Vega, ''A fully programmable data acquisition system for the TJ‐I and TJ‐IU devices'', [[doi:10.1063/1.1143569|Rev. Sci. Instrum. '''63''' (1992) 4806]]
* B.Ph. van Milligen, A. Lopez Fraguas, ''Expansion of vacuum magnetic fields in toroidal harmonics'', [[doi:10.1016/0010-4655(94)90112-0|Comp. Phys. Comm. '''81''' (1994) 74]]
* A.P. Navarro, M.A. Ochando, F. Medina, B.Ph. van Milligen, ''Local plasma radiation loss rate determination in tokamaks and stellarators'', [[doi:10.1063/1.1146535|Rev. Sci. Instrum. '''66''' (1) (1995) 552]]
* E. Ascasíbar, C. Alejaldre, et al, ''First results of the TJ-I U torsatron'', [[doi:10.13182/FST95-A11947068|Transactions of Fusion Technology 27 (1995) 198]]
* B.A. Carreras, C. Hidalgo, E. Sánchez, M.A. Pedrosa, R. Balbín, I. García-Cortés, B.Ph. van Milligen, D.E. Newman, V.E. Lynch, ''Fluctuation-induced flux at the plasma edge in toroidal devices'', [[doi:10.1063/1.871523|Plasma Physics '''3''' (7) (1996) 2664]]
* J. Qin, E. Ascasíbar, A. López-Fraguas, J.A. Jiménez, F. Castejón, T. Estrada, J. Herranz, F. Medina, B.Ph. van Milligen, I. Pastor, J. Sánchez Sanz, TJ-IU Team, ''Measurements of plasma beta in stellarators'', [[doi:10.1088/0029-5515/36/3/I11|Nucl. Fusion '''36''' (1996) 381]]
* M.A. Pedrosa, M.A. Ochando, J.A. Jiménez, R. Balbín, J. Qin, and C. Hidalgo, '' Magnetic configuration effects on the TJ-IU torsatron plasma edge turbulence'', [[doi:10.1088/0741-3335/38/3/011|Plasma Phys. Control. Fusion '''38''' (1996) 365]]
* Marin, J.  Carballo, I.  Olmos, P.  Ascasibar, E.  Pastor, I.  Qin, J.  Herranz, J.  Fraguas, A.L., '' Real time image integrator for magnetic surface mapping experiments in TJ-I U torsatron'', [[doi:10.1109/23.486038|IEEE Transactions on Nuclear Science '''43''', 1 (1996) 234]]
* V. Tribaldos and B. Ph. van Milligen, ''Neural network tool for rapid recovery of plasma topology'', [[doi:10.1063/1.1147774|Rev. Sci. Instrum. '''68''' (1997) 931]]
* E. Ascasibar, J. Qin, A.L. Fraguas, I. Pastor and J. Herranz, ''Measurement of magnetic surfaces on the TJ-I U torsatron'', [[doi:10.1088/0029-5515/37/6/I11|Nucl. Fusion '''37''', 6 (1997) 851]]
* J. Qin, E. Ascasíbar, J.A. Jiménez, A. López-Fraguas, O. Fedyanin, B.Ph. van Milligen, T. Estrada, J. Sánchez Sanz, ''Diagnostics for measuring equilibrium plasma beta in stellarators'', [[doi:10.1016/S0920-3796(96)00556-X|Fusion Engineering and Design '''34-35''' (1997) 695-699]]
* C. Hidalgo, M. A. Pedrosa, B. van Milligen, E. Sánchez, R. Balbín, I. García-Cortés, E. Ascasíbar, F. L. Medina, M. A. Ochando, and L. Rodríguez, and the TJ-IU Team, ''Statistical properties of turbulent transport and fluctuations in the TJ-I tokamak and the TJ-IU torsatron'', Plasma Phys. Rep. '''23''' (1997) 517
* B. Zurro, C. Burgos, K.J. McCarthy, and L. Rodriguez Barquero, ''Design of luminescent detectors for the TJ-II device'', [[doi:10.1063/1.1147718|Rev. Sci. Instrum. '''68''' (1997) 680]]
* B. Zurro, K.J. McCarthy, E. Ascasíbar, F. Aragón, C. Burgos, A. López and A. Salas, ''Observation and interpretation of topological structures in impurity ion radiation profiles from the hot plasma of a torsatron'', [[doi:10.1209/epl/i1997-00459-5|Europhys. Lett. '''40''' (1997) 269]]
* F. Castejón, B. Zurro, and A. Cappa, ''Feasibility study of a method to measure the ECRH field in the plasma interior (abstract)'', [[doi:10.1063/1.1147616|Rev. Sci. Instrum. '''68''' (1997) 504]]
* E. Sánchez, C. Hidalgo, M.A. Pedrosa, R. Balbín, B.Ph. van Milligen, I. García-Cortés, ''Measurement of fluctuation induced flow by multiple Langmuir probes in the TJ-IU Torsatron'', Contrib. Plasma Phys. '''38''' (1998) S, 93
* C. Hidalgo, M.A. Pedrosa, B.Ph. van Milligen, et al, ''On the radial structure of fluctuations and turbulence induced flows'', [http://www.jspf.or.jp/JPFRS/PDF/Vol1/jpfrs1998_01-096.pdf J. Plasma Fusion Res. SERIES '''1''' (1998) 96]
* E. de la Luna and V. Krivenski, ''Kinetic effects on Electron Cyclotron Emission during Modulated ECRH in TJ-IU'', [http://www.jspf.or.jp/JPFRS/PDF/Vol1/jpfrs1998_01-354.pdf J. Plasma Fusion Res. SERIES '''1''' (1998) 354]
* F. Medina, L. Rodríguez-Rodrigo, M.A. Ochando and F. Castejón, ''Superthermal electrons in the TJ-IU torsatron'', [[doi:10.1088/0741-3335/40/11/006|Plasma Phys. Control. Fusion '''40''' (1998) 1897]]
* B.A. Carreras, R. Balbin, B. van Milligen, M.A. Pedrosa, I. Garcia-Cortes, E. Sanchez, C. Hidalgo, J. Bleuel, M. Endler, H. Thomsen, A. Chankin, S. Davies, K. Erents, and G.F. Matthews, ''Characterization of the frequency ranges of the plasma edge fluctuation spectra'', [[doi:10.1063/1.873748|Phys. Plasmas '''6''' (1999) 4615]]

[[Category:Toroidal confinement devices]]