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playground:change
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playground:change [2012/02/06 20:24] 50.41.34.104 |
playground:change [2017/04/17 11:47] jacobs |
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| ==== Changing Terminal Energy ==== | ==== Changing Terminal Energy ==== | ||
| - | 1. Switch OVERVOLTAGE PROTECTION to DISABLE. | + | - Put the Faraday cups in. |
| - | + | - Switch OVERVOLTAGE PROTECTION to DISABLE. | |
| - | 2. Switch the control mode to GVM. | + | - Switch the control mode to GVM. |
| - | + | - Slowly turn the CONTROL GAIN to zero while watching the grid voltage. If the grid voltage rises above -5 volts, reduce the CHARGING VOLTAGE to keep the grid voltage less than -5 volts, then continue reducing the CONTROL GAIN to zero. | |
| - | 3. Turn the CONTROL GAIN to zero. | + | - To go to a higher energy move the CORONA PROBE POSITION "OUT" while raising the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -5 VDC during this operation. |
| - | + | - To go to a lower energy move the CORONA PROBE POSITION "IN" while lowering the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -5 VDC during this operation. | |
| - | 4. To go to a higher energy move the CORONA PROBE POSITION "OUT" while raising the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -10 VDC during this operation. | + | - 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. |
| - | + | - 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. | |
| - | 5. To go to a lower energy move the CORONA PROBE POSITION "IN" while lowering the CHARGING VOLTAGE. **__NEVER__** allow the GRID VOLTAGE to go more negative than -10 VDC during this operation. | + | - Make fine adjustments to the TERMINAL VOLTAGE Dial to reach exactly the desired GVM value. |
| - | + | - Switch OVERVOLTAGE PROTECTION to ENABLE. | |
| - | 6. 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. | + | |
| - | + | ||
| - | 7. 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. | + | |
| - | + | ||
| - | 8. Make fine adjustments to the TERMINAL VOLTAGE Dial to reach exactly the desired GVM value. | + | |
| - | + | ||
| - | 9. Switch OVERVOLTAGE PROTECTION to ENABLE. | + | |
playground/change.txt · Last modified: 2017/04/17 11:47 by jacobs
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