Tokamak: FTU

Pulse number: 12747

Contact person: M. Romanelli (mromanel@frascati.enea.it)

Institution: Associazione EURATOM-ENEA sulla Fusione Frascati (Roma) Italy

Date of shot: 16 May 1997

Analysis code: ODIN (equilibrium), EVITA(data collection and power balance)

Run number: EVITA case transp-n1

Date of analysis: 17 Jan 2002

Assumption made for analysis:
FTU has an almost circular palsma cross section. Elongation value is provided,
but triangularity and identation are set to 0.
Zeff profile is assumed flat and Zeff value is assumed constant in time, in agreement with visible bremsstrahlung measurements.
q profile from the solution of the current diffusion equation using neoclassical
resistivity (q profile in agreement with MHD (radial position of
rational q's));
Ion temperature profile from the solution of the neoclassical power balance
(it matches the experimental neutron yield, taking into account error bars)

Shot description, purpose of the experiment:
plasma current 800 KA, Toroidal magnetic field  7.2 T ohmic discharge, 
fired two pellets in the plasma'core'.
The energy confinement time in the post
pellet phase nearly doubles.The increase in 
confinement time is well above that expected because
of the increased density (effect of profile peaking).
Study of pellet enhanced energy confinement time on FTU.

Publication:
"Steady Improved confinement in FTU high field plasmas 
sustained by deep pellet injection" D. Frigione, et al. Nuclear Fusion 41 No 11
(November 2001)
"Simulation of Turbulence in FTU Plasmas" M Romanelli et al
Proceedings of the Joint Varenna-Lausanne Int. Workshop, Varenna (2002)

Additional information:
FTU tokamak has an nearly  circular cross section.
Toroidal limiter is in Molibdenum, the external poloidal limiter is in inconel.

The data cover the time interval from 0.058-0.088 s. The two 
pellets are fired at t=0.06 and t=0.07.
Impurity content is dominated by Nickel and Oxygen. 

0D data:

0D data refer to t=0.058, pre-pellet phase.