Tokamak: JET

    Pulse number: 53501

    Contact persons: Pam Stubberfield, Vassili Parail

    Institution:  EFDA-JET

    Date of shot: 010208

    Analysis codes: TRANSP, EFIT for plasma boundary,EFIT uses MSE for q profile

    Run number:  53501C05

    Date of analysis: 010514 TRANSP run by Yuri Baranov

    Assumptions made for analysis:

    Ti and rotation velocity profiles from CX measurements, taken 
    at 46.0 secs during NBI blip, are used. 
    Ne profile vs. radius from LIDAR measurements and Te profile vs.
    radius from ECE(KK3) and LIDAR measurements are used.
    Diagnostic data for 1 impurity species (C) provides a Zeff profile.
    1D bulk radiation is used in the analysis.
    Edge ptcl confinement time is set to 0.3s.
    q profile provided by EFIT (which takes into account MSE
    measurements) is used from start of run at 41.70 secs until 41.85 secs
    after that TRANSP field diffusion provides the q profile. 
    Note that the q-profile is deeply inverted at 42.0 secs. 

    LH current and heating to the electrons is passed to TRANSP.
    The lower hybrid heating is modelled by the LHCD ray tracing 
    and Fokker-Planck code DELPHINE, described   by F.Imbeaux et al in
    Report EUR-CEA_FC1679
 
    Shot description,purpose of the shot: Optimised shear discharge with
    Negative magnetic shear and ITB with pure electron heating

    Publications:  D.M.D. Hogeweij et al., PPCF 44 (2002) 1155-1165

    Additional information:

    Pulse #53501 is one of the best documented Optimised shear JET
    discharges with a very hollow q-profile and pure electron ITB. 
    Its characteristic feature is that plasma breakdown was assisted by
    LHCD with the power Plh=2.5MW applied throughout the pulse.
    The plasma current was ramping up at the start of the pulse to
    reach a steady current of Ip=2.4MA from t=47.0 sec at a toroidal
    magnetic field Bt=3.4T. 
    Plasma energy of between 1 and 1.2MJ was maintained quasi-stationary
    until t=50sec (end of Lower Hybrid heating).
    The plasma developed a strong ITB in the region of the negative
    magnetic shear with the foot of the barrier position gradually
    shrinking from Rfoot=3.4m at t=42.5sec to Rfoot=3.2m at t=48sec.

    There are 22 1-D Ufiles and 32 2-D Ufiles. In the 2d file the deuterium
    density is stored in NM1. NIMP contains the carbon density. 
    QLHE and CURLH have been added to the 2d file and the volume integral
    of QLHE has been put into PLH in the 1d file. 
    No data connected with the NB blip is provided.
    In the file JET_53501_0d.dat data is given at 49.0 secs. 

    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.
    kappa = (Zmax-Zmin)/(Rmax-Rmin),   delta = (RGEO - min(R(zmin),R(Zmax)))/a
    XPLIM is from XLOC ; SEPLIM is given by EFIT.
    PLTH is defined by WTH/TAUTH coming directly from TRANSP output and not 
    as defined in the standard list of variables.