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Debuncher Tunes Calculator

Document #:
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Submitted by:
Brian E. Drendel
Updated by:
Brian E. Drendel
Document Created:
24 Apr 2008, 08:13
Contents Revised:
28 Jun 2010, 14:19
Metadata Revised:
28 Jun 2010, 14:19
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24 Apr 2008, 08:13
A spreadsheet to help streamline Debuncher Tunes calculations based on SA measurements.
1. Run the "Measure Debuncher Tunes" aggregate in the Pbar Ops Sequencer (mode = 19), "Experts-only" section.
2. The aggregate will walk you through six measurements (two sidebands and one revolution frequency measurement in each plane). You must have stacking beam to do this measurement.
3. Let each measurement average through at least three minutes of beam data or until you have a good distribution on Pbar CATV channel 20.
4. Use P44 to display the trace. From this plot, estimate the peak frequency. Two items to note are:
a. If the Debuncher tunes are at their default values, then the peaks will be in the center of each plot.
b. Each box on the SA is 10KHz, or 0.01 MHz on the spreadsheet. So if the peak of the signal is 1/2 of a box to the left of the center, then just subtract 0.005 from the center frequency number in MHz.
5. On the INPUTS tab of the spreadsheet, enter the peak frequency for each of the six measurements. The sequencer walks you through the measurements in the following order: You will first do the Horizontal (cells B3, then B4, then B5), followed by the vertical (cells E3, then E4, then E5). NOTE: the spreadsheet locks out cells that you are not supposed to edit to avoid mistakes.
6. The horizontal and vertical tune values will be displayed in cells B8 and E8 on the INPUTS tab on the spreadsheet.
7. Tune space diagrams comparing the current Debuncher tunes to the defaults are located on the tuneSpace-8th and TuneSpace-9th tabs of the spreadsheet.
8. If you want to actually correct the tune, then complete this step. Otherwise, skip it. On the INPUTS tab, enter the current values of D:QSSRF and D:QDRF into cells B10 and B11 (E10 and E11 are auto calculated). The spreadsheet calculates the approximate QSS and QDF changes to get the tune back to the default values. Use the operational tune MULTS on P60 DEB10 <34> to move the tunes toward their default values. Repeat steps 1-6 above until the tunes are at their values +/- 0.002.
NOTE: If correcting both horizontal and vertical, set Cell B25 to YES and correct horizontal first and then vertical. When Cell B25 is set to YES, the corrected QSSRF and QDRF values from the horizontal change are put as the starting point for the vertical change. When Cell B25 is set to NO, then the starting values of QSSRF and QDRF are put as the starting piont for both the horizontal and vertical. Use this when making changes in only one plane.
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