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ASTRA has been used in many transport analysis works related with the TJ-II device. The citations that follow contain the coding of ASTRA models, so they can serve as a reference for the extension of ASTRA to particular needs, as well as a source of examples of ASTRA programming.
ASTRA has been used in many transport analysis works related with the TJ-II device. The citations that follow contain the coding of ASTRA models, so they can serve as a reference for the extension of ASTRA to particular needs, as well as a source of examples of ASTRA programming.


The ASTRA suite was adopted to perform interpretative and predictive transport for TJ-II plasmas considering an approximate geometry<ref>D. López-Bruna, F. Castejón, and J. M. Fontdecaba, ''Transporte con Astra en TJ-II,'' Informe Técnico Ciemat 1035, Ciemat, Madrid, Spain, Enero 2004, [https://inis.iaea.org/records/rcnnh-d2398]</ref>.  The geometry was improved in collaboration with G. Pereverzev, one of the authors of the ASTRA suite, in order to adapt the non axi-symmetric stellarator geometry<ref>D. López-Bruna, J. A. Romero, and F. Castejón, “Geometría del TJ-II en astra 6.0,” Informe Técnico Ciemat 1086, CIEMAT, Madrid, August 2006., [https://inis.iaea.org/records/xxs57-qjb22]</ref>, which allowed for first estimates of the evolution of the rotational transform according to the net plasma current in the device. A more detailed evolution of the rotational transform, including possible changes of the main metric coefficients depending on the evolution of the plasma pressure has been also programmed in ASTRA<ref>D. López-Bruna, J. M. Reynolds-Barredo, and B. Momo, “Evolution of the rotational transform in TJ-II discharges using the ASTRA code,” Informe Técnico Ciemat 1470, Ciemat, July 2020, [https://servicios.mpr.es/VisorPublicaciones/visordocumentosicopo.aspx?NIPO=83220004X&SUBNIPO=0001&IDPUBLICACION=000183220]</ref>. In this case, internal and driven currents (e. g. bootstrap currents or heating-driven currents) can be included in the calculations.
The ASTRA suite was adopted to perform interpretative and predictive transport for TJ-II plasmas considering an approximate geometry<ref>D. López-Bruna, F. Castejón, and J. M. Fontdecaba, ''Transporte con Astra en TJ-II,'' Informe Técnico Ciemat 1035, Ciemat, Madrid, Spain, Enero 2004, [https://inis.iaea.org/records/rcnnh-d2398]</ref>.  The geometry was improved in collaboration with G. Pereverzev, one of the authors of the ASTRA suite, in order to adapt the non axi-symmetric stellarator geometry<ref>D. López-Bruna, J. A. Romero, and F. Castejón, “Geometría del TJ-II en astra 6.0,” Informe Técnico Ciemat 1086, CIEMAT, Madrid, August 2006., [https://inis.iaea.org/records/xxs57-qjb22]</ref>, which allowed for first estimates of the evolution of the rotational transform according to the net plasma current in the device. A more detailed evolution of the rotational transform, including possible changes of the main metric coefficients depending on the evolution of the plasma pressure has been also programmed in ASTRA<ref>D. López-Bruna, J. M. Reynolds-Barredo, and B. Momo, “Evolution of the rotational transform in TJ-II discharges using the ASTRA code,” Informe Técnico Ciemat 1470, Ciemat, July 2020, [https://servicios.mpr.es/VisorPublicaciones/visordocumentosicopo.aspx?NIPO=83220004X&SUBNIPO=0001&IDPUBLICACION=000183220]</ref>. In this case, internal and driven currents (e. g. bootstrap currents or heating-driven currents) can be included in the calculations.


Demanding calculations are conveniently done through system calls from the ASTRA subroutines.  One such possible extensions of the ASTRA is the coupling of the calculations to the Montecarlo codes [http://fusionwiki.ciemat.es/wiki/EIRENE Eirene] and Fafner to obtain respectively recycling and [http://fusionwiki.ciemat.es/wiki/TJ-II:Neutral_Beam_Injection neutral beam injection] sources; or the coupling to ray-tracing calculations, including the access to distributed resources<ref>D. López-Bruna, J. M. Reynolds, A. Cappa, J. Martinell, J. García, and C. Gutiérrez-Tapia, “Programas periféricos de ASTRA para el TJ-II,” Informe Técnico Ciemat 1201, CIEMAT, March 2010, [https://documenta.ciemat.es/bitstream/123456789/114/1/40921_IC1201.pdf]</ref>.
 
As an extension of the geometrical possibilities in ASTRA, plasma regions occupied by magnetic islands or ergodic regions (limited by flux surfaces) can be treated as well in the transport models<ref>D. L ́opez-Bruna, B. Momo, and Y. Zhang, “One-dimensional treatment of the effect of small magnetic islands on transport in the TJ-II stellarator,” Tech. Rep. 1402, CIEMAT, Madrid, May 2017<\ref>.




Demanding calculations are conveniently done through system calls from the ASTRA subroutines.  One such possible extensions of the ASTRA is the coupling of the calculations to the Montecarlo codes [http://fusionwiki.ciemat.es/wiki/EIRENE Eirene] and Fafner to obtain respectively recycling and [http://fusionwiki.ciemat.es/wiki/TJ-II:Neutral_Beam_Injection neutral beam injection] sources; or the coupling to ray-tracing calculations, including the access to distributed resources<ref>D. López-Bruna, J. M. Reynolds, A. Cappa, J. Martinell, J. García, and C. Gutiérrez-Tapia, “Programas periféricos de ASTRA para el TJ-II,” Informe Técnico Ciemat 1201, CIEMAT, March 2010, [https://documenta.ciemat.es/bitstream/123456789/114/1/40921_IC1201.pdf]</ref>.


 
== See also ==
== See also ==


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