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playground:sputter
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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playground:sputter [2015/04/17 09:49] jacobs |
playground:sputter [2023/08/22 07:50] (current) carter |
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| - Ensure that desired beam target is loaded. | - Ensure that desired beam target is loaded. | ||
| - | - Set buncher tubes to correct configuration for desired beam species. | + | - Set buncher tube selector switch to correct configuration for desired beam species. Only rotate the switch clockwise. This switch is a large high voltage rotary switch and the proper position aligns the position number in the center of the arrow marker The position between numbers feels like a detent but is actually the switch wiper falling between the contacts. Do not have the switch in an apparent detent position. Move the switch to the middle of the friction range with the number properly aligned with the arrow marker. |
| - Check vacuum on LE extension, temperature gauge on cryopump should be at minimum value. | - Check vacuum on LE extension, temperature gauge on cryopump should be at minimum value. | ||
| - Open source gate valve by pressing either button on gate valve control at source gate. | - Open source gate valve by pressing either button on gate valve control at source gate. | ||
| + | - Set cesium reservoir controller temperature set point (green numbers): 117C for ones of uAs, 120C for tens of uAs. | ||
| - Remove grounding hook from power supply platform and hang on gate before closing. | - Remove grounding hook from power supply platform and hang on gate before closing. | ||
| - Close both gates to source area. Orange lights on Glassman supplies should come on at gate closing. (If not, check other gate on the other side of the accelerator; both must be secured.) | - Close both gates to source area. Orange lights on Glassman supplies should come on at gate closing. (If not, check other gate on the other side of the accelerator; both must be secured.) | ||
| - | - Press the doorbell button on top the Pelletron AC Power Center. The Extractor and Target Glassman supplies should indicate Voltage Control with red lights. | + | - Press the "doorbell" button on top the Pelletron AC Power Center. The Extractor and Target Glassman supplies should indicate Voltage Control with red lights. |
| + | - NOTE: In addition to the "doorbell" button there is a "boost" button that can be used in a case where the gate was only open for a short time and the yellow "power on" lights do not illuminate when the gates are closed. If the yellow lights do not come on with the gates closed and trying the "boost" button, leave the gate door open for 5 minutes then close the gate again and the yellow "power on" lights should illuminate and then press the "doorbell" button to turn on the HV supplies. | ||
| ** Startup and Normal Operation (in control room) ** | ** Startup and Normal Operation (in control room) ** | ||
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| - Turn up the **ionizer** heater. The ionizer operates at 21-22 amps. Keep in mind that the current will fall slightly as the ionizer gets warmer. Keep adjusting the current until the ionizer is stable at 21-22 A. It should take about 1 minute to reach 21 A from the standby value of 10 A. | - Turn up the **ionizer** heater. The ionizer operates at 21-22 amps. Keep in mind that the current will fall slightly as the ionizer gets warmer. Keep adjusting the current until the ionizer is stable at 21-22 A. It should take about 1 minute to reach 21 A from the standby value of 10 A. | ||
| - Turn up the Cesium **feed tube** heater to 0.450 amperes. | - Turn up the Cesium **feed tube** heater to 0.450 amperes. | ||
| - | - Set the cesium **reservoir** heater to 0.290. This should be enough to give ones of microamps beam for p and d. A setting of about 0.310 - 0.320 should produce tens of microamps. The reservoir current should not exceed 0.320. | + | - Set the cesium **reservoir** heater current to **0.315** Amps. This is an approximate value above the needed power level. |
| - Set the Glassman **extractor** power supply to 12.5 KV. Check to be sure the current is less than about 5 milliamps and the "control milliamperes" light is NOT lit. High current indicates that the source needs to be serviced. | - Set the Glassman **extractor** power supply to 12.5 KV. Check to be sure the current is less than about 5 milliamps and the "control milliamperes" light is NOT lit. High current indicates that the source needs to be serviced. | ||
| - Set the Glassman **target** power supply to 6.5 kV. Check to be sure the current is less than about 5 milliamps and the "control milliamperes" light is NOT lit. High current indicates that the source needs to be serviced. A newly installed pellet may cause instability for the first hour or so, but will become stable. | - Set the Glassman **target** power supply to 6.5 kV. Check to be sure the current is less than about 5 milliamps and the "control milliamperes" light is NOT lit. High current indicates that the source needs to be serviced. A newly installed pellet may cause instability for the first hour or so, but will become stable. | ||
| - Set the Glassman **lens** power supply to 1.5 kV. | - Set the Glassman **lens** power supply to 1.5 kV. | ||
| - | - **Tune the beam with the inflection magnet, source lens (usually about 1.5 kV), einzel lens A, and 2Y steerer.** The 2X steerer should be neutral (5.00 on dial) as X steering is be done by the inflection magnet at this stage. | + | - **Tune the beam with the inflection magnet, source lens (usually about 1.5 kV), einzel lens A, and 2Y steerer.** The 2X steerer should be neutral (5.00 on dial) as X steering is be done by the inflection magnet at this stage. Make sure the inflection magnet deflection is set to "Right". |
| - Monitor the target and extractor currents: target current should be around 2.5 milliamps, and no more than 5 mA. If target current gets too high, reduce the cesium reservoir setting. | - Monitor the target and extractor currents: target current should be around 2.5 milliamps, and no more than 5 mA. If target current gets too high, reduce the cesium reservoir setting. | ||
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| ** Shut Down Procedure ** | ** Shut Down Procedure ** | ||
| - | - Turn down the cesium reservoir heater power supply. Off is about 0.070 A. | + | - **Cesium reservoir**: The reservoir has a temperature controller that turns the power on/off as needed for a constant temperature. The controller is located next to the analog temperature meter on the source power platform. The red numbers are the measured temperature, the green numbers are the set point temperature, there is a small red light that indicates when the controller is calling for power. The reservoir current switches between 0.150A and .315A as directed by the controller. |
| - | - Wait for the reservoir temperature to drop below 80° C. | + | - Wait until the reservoir controller's red power light is on and you can see about .315A reservoir current on the meter, run the reservoir current down on the digital meter until it stops. Make sure that you see controller red light on with minimal amps of current. |
| + | - Wait for the reservoir temperature (red numbers on controller) to drop below** 85**° C. | ||
| - Turn down the feed tube power supply. | - Turn down the feed tube power supply. | ||
| - Wait for the feed tube temperature to drop below 80° C. | - Wait for the feed tube temperature to drop below 80° C. | ||
playground/sputter.1429278569.txt.gz · Last modified: 2015/04/17 09:49 by jacobs
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