jet_40542_com.dat = comments file for ITPA WDB Profile Database submission Tokamak: JET Pulse number: 40542 Shot description, purpose of the shot: Optimized Shear Contact persons: Robert Budny (budny@princeton.edu) Institution: EFDA-JET Date of shot: 19970214 Time of interest = 7.39s (47.39s in JET PPF time) for peak neutron emission Analysis codes: TRANSP and EFIT (for plasma boundary) Run number: 40542C09 done at PPPL, stored at JET and on mdsplus server Date of analysis: 20080319 by Robert Budny This is a resubmission correcting VROTM Assumptions made for analysis: 20 Zones Up/down asymmetric boundary given by EFIT. Ti, toroidal rotation velocity, and Zeff profiles from CX measurements. Te and Ne profiles from LIDAR measurements. 1D bulk radiation is used in radiation emission. Particle confinement time is calculated from source rates. q profile calculated in TRANSP from poloidal field diffusion Additional information: I_p=3.3MA, B_Z=3.58T 18.8MW D-NBI from 45.0-48.0s 5.0MW ICRH from 45-52.5s V.Parail selects this for general modeling analysis at 45.4s an ITB emerges in L-mode edge at 46.5s Ni injection starts at 47.0s quasi steady state ELMy edge coexists with good ITB The direction of the toroidal field and plasma current were in the normal JET direction - clockwise viewed from above. In the file JET_40542_2d.dat data NM1, NM2, and NM3 are the caclulated densities of D, trace T, and average impurity ions. In the file JET_40542_0d.dat data is given at 7.39 s. Values for elongation and triangularity in the 0d, 1d and 2d files are from the TRANSP output derived from the boundary input definition provided by EFIT. XPLIM and SEPLIM are given by EFIT. as defined in the standard list of variables. The TRANSP run gives a simulated W_dia in good agreement with the measured values, and a neutron emission rate in good agreement with the measured values up to 15.0s, then 10% higher until the end of tne NBI. Publications: 1) Soldner F.X., et al., to be published in Nuclear Fusion (1998) 2) Soldner F.X, JET Team, Plasma Physics and Contr.Fusion 39,B353 (1997) 3) Parail, V., et al., to be published in Nuclear Fusion (1998) 4) For use of TRANSP for JET see R.V.Budny, et al., "Local transport in Joint European edge-localized high-confinement mode plasmas with H, D, DT, and T isotopes", Phys. of Plasmas <7> (2000) 5038 JET shot 40542 has been run in the standard scenario for high performance Optimised Shear discharges but in the Double Barrier mode. Internal and external transport barriers are superposed in the Optimised Shear configuration with the plasma edge in ELMy H-mode. The discharge approaches steady-state conditions for both temperature and density profiles. High performance with an H-factor H89-P > 2 was maintained for four energy confinement times. The discharge was initiated with a fast plasma current ramp and an early X-point formation at 40.8 secs. LHCD from 40.4 - 41.2 secs during the ramp phase helped form the target q-profile. NBI was stepped up from zero to 10 MW at 45.0 secs and then to 18 MW at 45.4 secs. An internal transport barrier was formed in the plasma at 45.4 secs. The peripheral plasma remained in L-mode until 46.1 secs when a transition to an ELMy H-mode occurred. The H-mode adds an edge transport barrier to the persisting internal transport barrier. Both barriers co-exist for the remaining phase of high power heating until NBI is ramped down from 47.5 secs. During the L-mode phase the ion heat conductivity Xi fell to the neo-classical level in the plasma core and the region of reduced Xi expanded to 2/3 of minor radius with the expansion of the internal transport barrier. Xi reduced by a factor 3 in the peripheral region during the ELMy H-mode phase. A newly developed transport model reproduces the experimental heat conductivities.[3] Values for kappa and delta in the 0d, 1d and 2d files are from the TRANSP output derived from the boundary input definition provided by EFIT. XPLIM is from XLOC ; SEPLIM is given by EFIT.