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[[File:TJ-IU.JPG|200px|thumb|right|The TJ-IU Torsatron]]
[[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).  
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 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 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.
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.


Currently, [[TJ-IU]] is located at the [http://www.ipf.uni-stuttgart.de/index_e.html University of Stuttgart] in Germany under the name of [[TJ-K]].
== External links ==


== 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]]


* [http://www-fusion.ciemat.es/New_fusion/en/TJII/TJIU/TJIU.shtml TJ-IU]
[[Category:Toroidal confinement devices]]

Latest revision as of 11:44, 6 August 2021

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.

Parameter Value Unit
Major radius, R0: 0.60 m
Mean plasma radius, a: 0.10 m
Minor coil radius, Rc: 0.24 m
Number of periods, m: 6
Rotational transform at the axis, ι0: 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, BT, at φ=30 degrees: 0.5 T
2nd harmonic Electron Cyclotron Heating, 28 - 37.5 GHz: 200 kW
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 University of Stuttgart in Germany.

External links

References

  • L. Pacios, J. Guasp, and J. Vega, A fully programmable data acquisition system for the TJ‐I and TJ‐IU devices, Rev. Sci. Instrum. 63 (1992) 4806
  • B.Ph. van Milligen, A. Lopez Fraguas, Expansion of vacuum magnetic fields in toroidal harmonics, 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, Rev. Sci. Instrum. 66 (1) (1995) 552
  • E. Ascasíbar, C. Alejaldre, et al, First results of the TJ-I U torsatron, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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), 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, 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, 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, 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, Phys. Plasmas 6 (1999) 4615
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