| Aug 17 2012 05:46:42:690PM | | Steve Wolfe |
Physop notes for reverse field operation
On invoking PCS for the first run (or doing a LOAD_FROM or IMPORT_SEG from
any shot before 1120817000)
PCS should bring up the configuration warning screens. Read what they say
and note all changes since the date of the shot you are loading. You can
review this information by pushing the "Show HYBRID Config" button at the
bottom of the PCS main screen.
The new entry for reverse field says:
08/17/2012 smw - Reverse field operation: Use FLIP on ALL_P and ALL_V screens to invert waveforms.
Recalculate B21_PROJ predictor. Change dpcs_fizzle SOURCE=1060517007 (ASYNC_PROS)
When you acknowledge this warning you should get a second pop-up specifically
dealing with the dpcs loadable procedures:
08/17/2012 smw - Use dpcs_fizzle (ASYNC_PROS) source 1060517007 for reverse field
If you are starting from a normal field shot, you will need to:
1) modify the sign of the PF and TF currents and voltages.
2) recalculate the error field compensation algorithm (B21_PROJ)
3) point the DPCS_FIZZLE procedure at the reversed field shot 1060517007
4) If the shot comes from before 12/05/2011, then you need to recalculate
the magnetics predictors
If you are actually starting from an old reversed field shot from 2011 or earlier, then the currents and voltages should be ok, and probably the
B21_PROJ predictor and the dpcs_fizzle setting will be as well, though
it wouldn't hurt to check.
You will need to recalculate the magnetics predictors. since
a number of flux loops and bp coils have broken and/or been replaced since
the last reversed field run.
Detailed instructions for converting a normal field shot are:
Step 1:
For each segment (it is best to deal with all of them, even the unused
ones, to avoid future accidents), bring up the ALL_P and ALL_V screens
and use the "FLIP" menu item (on the pop-up menu under the right mouse
button) to invert the following waveforms:
ALL_Ps (seg1): IC_OH1,IC_OH2U,IC_EF1U,IC_EF1L,IC_EF2U,IC_EF2L,IC_EF4U,IP
note: all of the traces in the right-hand column
ALL_Vs (seg1): OH1_VOLT,CHOPPER,OH2U_VOLT,OH2L_VOLT,EF1U_VOLT,EF1L_VOLT,
EF2U_VOLT,EF2L_VOLT,EF4_VOLT,EF3_VOLT,TF_CURRENT
note: everything except the pulse gas lines.
ALL_Ps (seg2-4) EF2_by_EF4,IC_EF4U,IP (and any other IC_* that may be there)
ALL_Vs (seg2-4) OH1_VOLT,CHOPPER,OH2U_VOLT,OH2L_VOLT,EF1U_VOLT,EF1L_VOLT,
EF2U_VOLT,EF2L_VOLT,EF4_VOLT,EF3_VOLT,TF_CURRENT
note: everything but the pulse gas lines and ACOIL_CUR
Step 2:
If using the B21_PROJ feedback for locked mode control it is necessary
to recalculate the predictor on this wire. Note that the correct acoil
configuration for reverse field is (-Dtop +Dbot +Jtop -Jbot), the reverse
of the normal field direction. This must be properly entered by the
EngOp on his screen, and should be specified on the Physop run plan.
To recalculate the B21_PROJ predictor, click on the button to bring up the
EDIT_WIRE screen. If the EO has already entered the Acoil configuration on
his control screen then it should be sufficient to click the CALL button
on the middle row, for the algorithm "nonaxi_smw". However, to be sure that
the correct configuration is used, type the following line
ACOIL_CONFIG="-DTOP +DBOT +JTOP -JBOT"
into the Keyword Args field, and then click CALL. After the call completes, the
Alg. Version field should read:
07-Aug-2009,total 2/1 non-axisymmetric field at phi= 18.67 degrees, Acoil=-DTOP+DBOT+JTOP-JBOT
You can then OK the EDIT_WIRE screen, Acknowledge the P_INFO warning, and OK
the Verify Factor screen.
It would be a good idea to change the Segment Title to indicate that
the programming is for reversed field.
Step 3:
The dpcs_fizzle sequence also needs to be changed for reverse field.
Click on the ASYNC_PROS button in the next to the last row on the main
PCS screen, and click on the "dpcs_fizzle" menu item. This will bring
up an EDIT_Procedure popup form. Change the value in the field labeled
SOURCE_SHOT to 1060517007. Then OK the EDIT_Procedure screen.
**** IT IS VERY IMPORTANT TO GET THIS RIGHT! ****
If you've started from a recent shot and used IMPORT_SEGMENT to recover
older programming, which I recommend, then the dpcs_xjump and dpcs_piezo_chopper
procedures should be present. It's worthwhile to check these. The dpcs_xjump
threshold (under Paramters) should be set to 1.0e15. The dpcs_piezo_chopper
OUTPUTS field should be a string array containing the names of pulsed gas valves, typically ["pulse_gas1","pulse_gas3","H-bot "].
The remaining question is what to do about the RCUR offset and BR_0 offset
in segment 1 for the startup. I think the sign on RCUR offset should be
reversed, say from 3000 to -3000, but we'll have to see what works. Recent
startups have used a BR_0 offset of 0.001, and probably that should be changed
to -.001. Hopefully we will refine these settings on Monday.
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