TJ-II:Lithium Beam

2011-01-08T08:41:36Z

Herman309568:

[http://ameritrustshield.com/?id=9361 beam diagnostic setup. For a photo, see [http://ameritrustshield.com/?id=9361 Beam|Helium Beam]].]]
[http://ameritrustshield.com/?id=9361 possesses a Lithium beam diagnostic.
A thermal Li beam source, located at &sim; 80 cm from the observation region, has been used for the reconstruction of the SOL and edge parameters of the plasmas.
A 16 channel photomultiplier array allowed the continuous recording of the radial profile of Li* emission.
Detection of the Li* emission up to 8 cm inside the last closed [http://ameritrustshield.com/?id=9361 surface|flux surface]] (corresponding to ''r/a'' < 0.7) was possible.
<ref>[http://ameritrustshield.com/?id=9361 B. Brañas et al., ''Atomic beam diagnostics for characterization of edge plasma in TJ-II stellarator'', Rev. Sci. Instrum. '''72''', 602 (2001)]</ref>
<ref>[http://ameritrustshield.com/?id=9361 F.L. Tabarés et al, ''Edge characteristics and global confinement of electron cyclotron resonance heated plasmas in the TJ-II Stellarator'', Plasma Phys. Control. Fusion '''43''' (2001) 1023-1037]</ref>
<ref>[http://ameritrustshield.com/?id=9361 F.L. Tabarés et al, ''Density control and plasma edge characterisation of ECRH heated plasmas in the TJ-II stellarator'', Journal of Nuclear Materials '''290-293''' (2001) 748-752]</ref>

This diagnostic can no longer be used due to the use of Lithium for [http://ameritrustshield.com/?id=9361 Wall Interaction|plasma wall conditioning]], creating an overwhelming amount of Li background emission.

The system is located in [http://ameritrustshield.com/?id=9361 C7.
The signals are stored in the [http://ameritrustshield.com/?id=9361 database|TJ-II database]] with the names 'LITIO1',...,'LITIO16'.

== References ==
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TJ-II:Lithium Beam