Tokamak: JET

    Pulse number: 53537

    Contact persons: Pam Stubberfield, Vassili Parail

    Institution:  EFDA-JET

    Date of shot: 010201

    Analysis codes: TRANSP, EFIT for plasma boundary and initial q profile

    Run number: 53537C03

    Date of analysis: 010514 TRANSP run by Yuri Baranov

    Assumptions made for analysis:

    Ti and Zeff profiles from CX measurements are used. 
    Te profile vs. radius is from KK3 measurements. 
    Ne profile from LIDAR measurements.1D bulk radiation is used in the analysis.
    Rotation velocity profile from CX measurements is provided.
    C impurity. Edge ptcl confinement time is set to 0.3s.
    q profile provided by EFIT used from start of run at 43.50 secs
    until 44.5 secs. TRANSP field diffusion then provides the q profile.
 
    Shot description,purpose of the shot: Optimised shear discharge

    Publications: Baranov Y.F et al, "Local Conditions for Ion ITB
                  Formation in JET" submitted to Plasma Physics and
                  Controlled Fusion, special issue
                  Challis C et al, "Influence of the q-profile Shapes
                  on Plasma Performance in JET", ibid
                  Litaudon X et al, "Towards fully Non-inductive Current
                  Drive Operation in JET", ibid

    Additional information:

    Pulse #53537 is one of the best Optimised Shear JET discharges. 
    Its characteristic feature is that plasma breakdown was assisted by
    LHCD with the power Plh=2.2MW applied from t=41.0sec until t=44.2 sec.
    The plasma current was ramping up throughout the pulse so that it has
    reached Ip=2.2MA at t=45.2 sec at a toroidal magnetic field Bt=2.6T. 
    The main heating power was applied at t=43.7 sec and reached its full
    capacity (9.6MW of NBI and 6MW ICRH) at t=45.2 sec. Plasma energy was
    rising throughout the main heating phase, reaching the level of 5.8MJ
    and confinement time enhancement factor H89 exceeded 2.3 shortly
    before deterioration caused by transition to type-I Elmy H-mode. 
    The plasma developed a strong ITB during the main heating, which
    gradually expanded its footpoint to R=3.55m. 

    There are 24 1-D Ufiles and 37 2-D Ufiles.  All beam related quantities
    (energy, particle sources, currents etc) have been smoothed to
    suppress Monte-Carlo noise. In the 2d file the deuterium density is
    stored in NM1. 
    In the file JET_53537_0d.dat data is given at 45.20 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.  
  
    The TRANSP run gives a simulated W_dia and neutron yield about
    15% lower than the measured values.