Differences

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--- playground:startup [2012/06/29 09:27] – carter
+++ playground:startup [2026/06/25 16:12] (current) – external edit 127.0.0.1
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 ====== Accelerator Start-up ======
+=== ==== **  Clear all Areas   ** ==== ===
 .	**Verify Initial Machine Voltage setup:**
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+a.  Switch the POWER SUPPLIES to ON, the yellow light should come on. Switch CHAIN MOTORS to ON, lights 1, 2, and 3 should all come on.  Begin to increase the CHARGING VOLTAGE  while observing the TERMINAL VOLTAGE and the GRID VOLTAGE.  DO NOT allow the GRID VOLTAGE to become more negative than   **-5** VDC.
-a.  Switch the POWER SUPPLIES to ON, the yellow light should come on. Switch CHAIN MOTORS to ON, lights 1, 2, and 3 should all come on.  Begin to increase the CHARGING VOLTAGE  while observing the TERMINAL VOLTAGE and the GRID VOLTAGE.  DO NOT allow the GRID VOLTAGE to become more negative than   -10 VDC.
+**NOTE: If you will be raising the terminal voltage to 3.5MV or higher double click the TANDEMWATCH icon on the alphatross terminal monitor.  After approximately 1 minute, the tandemwatch graph should appear on that monitor.  Also, check LE tube conditioning by; 1. In the light yellow terminal window, type the command "plot magnet".  This will open a graph that will plot in high sensitivity the LE tube vacuum to watch for tube conditioning.  2. Now, also in the light yellow terminal window, type the command "plotlevacuum".  The plot window should begin plotting a high resolution view of the LE vacuum.  If spikes in vacuum are observed when raising the terminal voltage, stop increasing the terminal voltage and wait until the vacuum returns to the baseline value.  Continue increasing slowly to the desired terminal voltage while continuously monitoring the LE tube vacuum and pausing when increases are seen.  After the desired terminal voltage is reached, the program watching the vacuum can be stopped by entering c/r in the terminal window and the plot can be closed.
+**
-b.	Continue to increase the CHARGING VOLTAGE until you reach the approximate TERMINAL VOLTAGE **__OR__** until the GRID VOLTAGE reaches  -10 VDC, **__THEN__** proceed to step 2:
+b.	Continue to increase the CHARGING VOLTAGE until you reach the approximate TERMINAL VOLTAGE **__OR__** until you begin seeing any corona current.  If you begin seeing corona current, move the corona points out until no corona current is seen.
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 **2.	Corona Probe Adjustment**
-FYI:  The CORONA PROBE CURRENT will rise until it reaches the value set by the BIAS CURRENT.  After that, the GRID VOLTAGE will change to keep the CORONA PROBE CURRENT at the set value.  The goal is to balance the UPCHARGE and CORONA PROBE POSITION so that you have the desired TERMINAL VOLTAGE and -10 VDC on the GRID VOLTAGE.  Do (a) or (b) as needed:
+After reaching the approximate desired terminal voltage with no corona current present, begin moving the corona points in (set corona current/position to current).  Maintain the desired approximate terminal voltage by increasing the UPCHARGE and iteratively move the corona points in while restoring the terminal voltage with the UPCHARGE.  The CORONA PROBE CURRENT will rise until it reaches the value set by the BIAS CURRENT.  After that, the GRID VOLTAGE will change to keep the CORONA PROBE CURRENT at the set value.  The goal is to balance the UPCHARGE and CORONA PROBE POSITION so that you have the desired TERMINAL VOLTAGE and **-5** VDC on the GRID VOLTAGE (The GRID VOLTAGE may never reach -5 VDC when running at ultra low Terminal energy, E < 0.300 MV, do the best you can).  Do (a) or (b) as needed:
 a.	Move the CORONA PROBE POSITION “IN” to make the GRID VOLTAGE more negative.  This may require you to adjust the UPCHARGE to maintain TERMINAL VOLTAGE.
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 b.	Slowly raise the CONTROL GAIN to 2-3 for low current beams, around 5 for high current beams.  The system is now controlling in GVM mode.
-c.	Make fine adjustments to the TERMINAL VOLTAGE Dial to reach exactly the desired GVM value.
+c.	Make fine adjustments to the TERMINAL VOLTAGE Dial to reach exactly the desired GVM value.  Very fine adjustments to the terminal voltage can be made using the FINE control located coaxial to the BIAS CURRENT control with a full range of 1.5 KV.
 d.	Switch OVERVOLTAGE PROTECTION to ENABLE.
+e.      Do accelerator header and collect the NMR frequency and analyzer magnet current values.
 **4.	Beam Transport**
-a.      Use the magnet predictor tool and set Quad 1 to the predicted value.
+a.      Use the magnet predictor tool and set Quad 1 to the predicted value.  Do not make large abrupt changes to the Quad 1 current.  If a large abrupt change in current is attempted, the power supply may begin oscillating.  To stop this oscillation, run the current slider to zero then re-adjust to the desired current at a slower non-abrupt rate.
 b.	Tune beam and send it around the properly configured Analyzing Magnet.
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 e.	When in AUTO control the machine will go back to GVM control anytime the beam is interrupted.
+**5.	Dipole Magnet Setup Instructions**
+ a. Confirm that the Heinzinger power supplies are powered ON in the Small Target Room with the following LED's illuminated:  Red "ON", and Green "Remote".  If Off, Press the "Local/Remote" button to "Local"; then "Stby" then "On"; then "Local/Remote" to "Remote".
+ b. If not already visible on the control room computer screen, start the appropriate software GUI's using the "Restart" button for "analyzer, switcher, swinger, or tweaker" magnets.
+ c. In the "Switcher_hz422" and "Analyzer_hz422" GUI windows, magnet beam deflection (left/right) is indicated on the "Magnet Current" line indicated as beam "left or right". The polarity can be toggled using the "Polarity" button located to the right of the "Lock" button.  When the "Polarity" button is pressed, the magnet current will automatically be set to zero and the polarity will reverse when the new magnet current is set.  The "Swinger_hz422" and "Tweaker" have no polarity reversal button.
+ d. Run the slider to the desired current.