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playground:startup
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playground:startup [2012/02/10 14:51] jacobs |
playground:startup [2012/06/29 09:27] carter |
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| ====== Accelerator Start-up ====== | ====== Accelerator Start-up ====== | ||
| - | 1. **Initial Machine Voltage setup:** | + | 1. **Verify Initial Machine Voltage setup:** |
| Initial conditions on TPS: | Initial conditions on TPS: | ||
| Line 42: | Line 42: | ||
| b. Move the CORONA PROBE POSITION “OUT” to make the GRID VOLTAGE less negative. This may require you to adjust the UPCHARGE to maintain TERMINAL VOLTAGE. | b. Move the CORONA PROBE POSITION “OUT” to make the GRID VOLTAGE less negative. This may require you to adjust the UPCHARGE to maintain TERMINAL VOLTAGE. | ||
| - | | + | c. If the low energy cup current is > 5 uA, put the beam into the high energy farady cup and tune for maximum current before proceeding to step 3. |
| - | + | ||
| **3. Establish Control** | **3. Establish Control** | ||
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| a. Set the TERMINAL VOLTAGE Dial to the desired value. The dial is 2 turns per MV (set the dial to twice the GVM you want). You may have to add some upcharge after setting the dial. | a. Set the TERMINAL VOLTAGE Dial to the desired value. The dial is 2 turns per MV (set the dial to twice the GVM you want). You may have to add some upcharge after setting the dial. | ||
| - | b. 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. | + | 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. | ||
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| **4. Beam Transport** | **4. Beam Transport** | ||
| - | a. Tune beam and send it around the properly configured Analyzing Magnet. | + | a. Use the magnet predictor tool and set Quad 1 to the predicted value. |
| + | |||
| + | b. Tune beam and send it around the properly configured Analyzing Magnet. | ||
| - | b. You may need to make adjustments to the TERMINAL VOLTAGE dial to get the terminal to the proper energy for transmission around the magnet and fairly balanced current on the slits. | + | c. You may need to make adjustments to the TERMINAL VOLTAGE dial to get the terminal to the proper energy for transmission around the magnet and fairly balanced current on the slits. |
| - | c. When current is present on the LE and HE Slit current meters you may then switch the Control Mode to AUTO (middle position) and the SLIT control light should illuminate. If there is instability in slit control you may try raising the CONTROL GAIN more. | + | d. When current is present on the LE and HE Slit current meters you may then switch the Control Mode to AUTO (middle position) and the SLIT control light should illuminate. If there is instability in slit control you may try raising the CONTROL GAIN more. If the slit currents are not balanced when in slit control, make slight adjustments in the CHARGING VOLTAGE to balance the slit currents. |
| - | d. When in AUTO control the machine will go back to GVM control anytime the beam is interrupted. | + | e. When in AUTO control the machine will go back to GVM control anytime the beam is interrupted. |
playground/startup.txt · Last modified: 2024/04/05 04:25 by carter
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