TJ-II: impact of impurities on turbulence: Difference between revisions

TJ-II: impact of impurities on turbulence (view source)

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Jose.regana

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	''' Proposal '''		''' Proposal '''

	The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and peformance, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the ~~radiation monitor signals~~ will be of key importance. In that sense, the present proposal is complementary to [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]		The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and peformance, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the evolution of the tomographic reconstruction of the bolometry and soft X rays (SXR) camera will be of key importance. In that sense, the present proposal is complementary to [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II) / ''Zeff measurement using visible bremsstrahlung (VB) with NBI heating (II)'']