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JETDSP TRANSP Tutorial

Introduction

JETDSP can deal with TRANSP data in a variety of ways, this tutorial introduces how to read TRANSP data and how to transform it. Data preparation is dealt with here. For information about how to perform individual tasks see the JETDSP manual

Comparison of Plasma currents.

This section deals with the comparison of the plasma current calculated by TRANSP and the current stored in the PPF system. A standard set will be produced to allow quick comparison of this data. Clear the signal list and;
  1. Read in the TRANSP signal 'VSURC' for pulse '53146' runid 'C01'.
  2. Read in the PPF MG3/VPA.
  3. The sign of the current differs in these two signals, so negate the second one to create a new signal.
  4. The TRANSP data starts at T=0 whilst the PPF data starts at T=40.0. Subtract 40 seconds from the negated PPF signal.
  5. Plot the final signal and the TRANSP signal on top of each other.
  6. Save this as a standard set and read it back in for pulse '50502' runids 'C11' and 'C12'.

Note that this could have been done by plotting the TRANSP signals 'VSUR' and 'VSURC'.

Profile data

TRANSP profiles can be processed on reading, this part shows how to make a comparison with a PPF. Again start with an empty signal list.
  1. Read the TRANSP profiles UTHRM and UFASTPP for pulse '53146' runid 'C01' making sure to volume integrate whilst loading.
  2. Slice these signals at the highest X point.
  3. Rename the resultant signals to UTH and UFPP.
  4. Create a processed signal of the form UTH+1.5*UFPP.
  5. Read the PPF MG3/WPD and shift its timebase as above.
  6. Overlay the resultant processed PPF and processed TRANSP data.
  7. Save as a standard set and read it back in for pulse '50502' runids 'C11' and 'C12'.

TRANSP axes

A large amount of TRANSP profile data is stored against axis 'X' and 'XB'. These are in terms of the 'square root of the normalised toriodal flux'. 'X' is defined to be at the centre of each simulation zone and 'XB' is defined at the edge of each zone. The actual positions of these points is held in the axes 'RZON' and 'RBOUN'. There are two other axes 'RMNMP' and 'RMAJM'. It is possible to transform axes using the TRANSP specific functions in JETDSP. This part will show some of these, along with other functions.
  1. Empty the signal list and read in UTHRM, making sure NOT to integrate.
  2. Select the signal and convert the axis to 'XB','RZON','RBOUN' and 'RMAJM'.
  3. Volume Integrate the signals on the axis 'RZON' and 'RBOUN'.
  4. Fixgrid the signal plotted against RMAJM.
  5. Save the fixgridded signal in the PPF system.

Multigraphs

TRANSP does not use standard sets to aid the loading of common sets of data but instead uses multigraphs. These can be read into JETDSP in the same way as other signals. There are some new operations which only apply for the multigraphs.
  1. Read in the scalar multigraph 'XNEUT' for pulse '53146' runid 'C01'.
  2. Plot it and bring up the 'Style Editor'.
  3. Hide the 'BBNTS' and 'BTNTS' parts, including their legends.
  4. Slice the multigraph the extract the 'MNEUT' part.

Flux contours

The flux contours used to construct the zones can be plotted. These are read using the TRANSP menu. Note that each each contour is a surface and hence the whole plot is somewhat confusing.
  1. Read in the flux surface for pulse '53146' runid 'C01'.
  2. Slice and plot the Flux surface at T=20.0
  3. Alter the legends to fit the screen.
  4. Create a new plot of the innermost flux surface as a function of time.
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