TJ-II:Proposal template: Difference between revisions

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== Proposal title ==
== Proposal title ==
'''Impurity injection by laser blow-off: influence of main ions charge/mass on impurity confinement and transport'''
'''Enter Title here'''


== Name and affiliation of proponent ==
== Name and affiliation of proponent ==
B. López-Miranda 1, B. Zurro 1, M. Martínez 1, E. Hollmann 2, A. Baciero 1, M. Ochando 1, F. Medina 1, K.J. McCarthy 1 and TS and TJ-II Team.//                             
Enter name and affiliation here
 
1  Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain.
 
2  University of California, San Diego, La Jolla, CA, USA.


== Details of contact person at LNF (if applicable) ==
== Details of contact person at LNF (if applicable) ==
B. López-Miranda:  belen.lopez@ciemat.es
Enter contact person here or N/A


== Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)==
== Description of the activity, including motivation/objectives and experience of the proponent (typically one-two pages)==
Motivation.
Enter description here <ref>A. Einstein, Journal of Exceptional Results (2017)</ref>
In previous experiments of impurity confinement in TJ-II plasmas we have investigated the behaviour of impurity confinement with the mass composition of the main ions and with charge/mass of the injected impurities [1]. Now we want to extend our study to He plasmas.
 
Proposal.
Within the present proposal, we plan to inject light and heavy impurities into TJ-II ECRH plasmas by means of laser blow-off. We plan to study the behaviour of impurity confinement with the charge/mass of the main ions on the relaxation of emission of light and heavy impurities injected in TJ-II. For that purpose we want discharges in He and study the impurity confinement as a function of effective mass.


== If applicable, International or National funding project or entity ==
== If applicable, International or National funding project or entity ==
This work was funded by the Spanish “MINECO” under Grant No. ENE2014-56517-R. B.L.M. would like to acknowledge her scholarship, Grant No. BES-2015-075704.
Enter funding here or N/A


== Description of required resources ==
== Description of required resources ==
Required resources:
Required resources:
* Number of plasma discharges or days of operation: We would need at least two operational days: one (compatible with other experiments) to adjust all the variables of the laser blow-off system and another day to perform the experiment. 
* Number of plasma discharges or days of operation:  
* Essential diagnostic systems: Main diagnostics will be radiation diagnostics (bolometers, X-rays, VUV spectrometer, etc.) and ECR radiometer data as well as other diagnostics with good time resolution.
* Essential diagnostic systems:
* Type of plasmas (heating configuration): We need standard configuration plasmas (100_44_64).
* Type of plasmas (heating configuration):
* Specific requirements on wall conditioning if any:
* Specific requirements on wall conditioning if any:
1. We want discharges in He in order to study the impurity confinement as a function of effective mass.
* External users: need a local computer account for data access: yes/no
 
* Any external equipment to be integrated? Provide description and integration needs:
2. We need discharges with solely ECRH and good control with constant density along discharges. Lower densities appear to give more stable target plasmas; however, we wish plasma electron densities that are sufficiently high to ensure good Thomson scattering profiling of the target plasma.
 
* External users: need a local computer account for data access: N
* Any external equipment to be integrated? Provide description and integration needs: N


== Preferred dates and degree of flexibility ==
== Preferred dates and degree of flexibility ==
Preferred dates: (XX-03-2017)  
Preferred dates: (format dd-mm-yyyy)
We would like to perform the experiment during March 2017.


== References ==
== References ==
<references />1. ZURRO B., HOLLMANN E., BACIERO A., OCHANDO M.A., MEDINA F., McCARTHY K.J. et al., “Transport studies using laser blow-off injection of low-Z trace impurities injected into the TJ-II stellarator”, Nuclear Fusion 51 (2011) 063015 (9pp).
<references />


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