jet_52979_com.dat = comments file for ITPA WDB Profile Database submission

 Tokamak: JET

 Pulse number: 52979

 Shot description: purpose of the shot:
   ELMy H-mode with high density, long duration, density peaking.

 Contact persons: Robert Budny (budny@princeton.edu), Martin Valovic

 Date of shot: 20010109

 Analysis codes: TRANSP and EFIT (for plasma boundary)

 Run number: 52979C16

 Time of interest = 22.0s (62.0s in JET PPF time) at peak Greenwald fraction).

 Date of analysis: 20081104 TRANSP run by Robert Budny
   This is a resubmission correcting VROTM

 Assumptions for analysis:

  Up/down asymmetric boundary given by EFIT.
  Ti, toroidal rotation, and Zeff profiles from CX measurements
  from 18.0 to 26s, at major radii of 3.23 to 3.81m
  (between x=sqrt. normalized toroidal flux=0.45 and 0.8).
  There are difficulties analyzing the CX data due to the high
  density of the plasma, so the Ti data was extrapolated in the core
  and near the edge.
  Ti extrapolated to Te before x=0.45 and beyond x=0.8
  Te and ne profiles from LIDAR measurements

  Radiation profile assumed to be flat.
  Sawteeth breaks identified from ECE measurements only between 15 to 18s.

 Additional information:

  Pulse 52979 was conducted under the ELMy H-mode Task Force (S1)
  Ref2.2.1 (Density limit in long pulses)
  to investigate density peaking at high density.
  The plasma was gass-puffed to a Greenwald fraction of 1.1.
  The Greenwald fraction was above 1.0 from 21.8 until25.4s.
  The upper and lower triangularities of the boundary were approximately
  0.54 and 0.39.

  The direction of the toroidal field and plasma current were in the
  normal JET direction - clockwise viewed from above

  The elongation of the boundary was approximately 1.75.
  The plasma current was 1.9 MA and the toroidal field was 2.0 T.
  The auxilliary heating consisted of D-NBI of 10.4MW from 18 to 25s,
  then 3.8MW until 26s (66s in JET time).
  The ELM frequency was approximately 50 Hz.
  The Greenwald fraction was above 95% for 21.5-23.7 sec.
  With similar plasmas durint the same run, this pulse forms a density
  scan with various values of gas puffing.

  The TRANSP run gives a simulated W_dia about 20% lower than the measured
  value.
  The simulated neutron rate is 40% higher than the measured value
  (peaking at 1.5E15/sg early in the NBI phase).
  This descrepancy could be due to Z_eff being too low or Ti being
  too high.

  The JETPPF CX data was CXSM seq 169
  The JETPPF Te and ne data was LIDR seq 122
  The JETPPF magnetics data was MG2 and MG3 seq 37, MAGN seq 8

  All calculations have 3een done on a 50 zone radial grid rather than
  the normal 20 grid.
  All beam related quantities (energy, particle sources, currents etc)
  have been smoothed to suppress Monte-Carlo noise. 

  In the jet_52979_2d.dat, trace H is stored in NM1, D in NM2,
  trace T in NM3, and measured C impurity in NM4.

  In the file jet_52979_0d.dat data is given at 22.0 secs.
  XPLIM and SEPLIM are from XLOC.
  DELTA is the average of the upper and lower triangularities.
  and not as defined in the standard list of variables.

 Publications: 
    1) J. Valovic, et al, "Long timescale density peaking in JET", 
       Plasma Physics and Controlled Fusion <44> (2002) 1911-1917,
    2) J.Ongena, et al., Nuclear Fussion <44> (2004) 124
    2) For a description of TRANSP analysis of JET ELMy H-mode plasmas see
       R.V. Budny, et al, "Local transport in Joint European
       Tokamak edge-localized, high confinement mode plasmas
       with H, D, DT, and T isotopes", Physics of Plasmas <7>
       (2000) 5038-5050.