task:sdt
Differences
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| task:sdt [2025/07/08 15:32] – painter | task:sdt [2025/10/09 18:39] (current) – painter | ||
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| During this time, the FS group may want to a very low beam current reading, usually around 1 nA to a few pA's. When they want this, it'll be best to put beam on FC1102. Switch to the Tetram setting and make sure that the range is set to 1.2 nA. Read the current on the cup and make adjustments to achieve the current reading they desire; this can be done with attenuators to get you in the ball park and the source slits to get more precise. A good practice to try at such a low reading is when you get to where you want the reading to be, insert FC0998. This will take beam off of 1102 and give you a chance to see if the reading that you are getting is from noise or is actually accurate. | During this time, the FS group may want to a very low beam current reading, usually around 1 nA to a few pA's. When they want this, it'll be best to put beam on FC1102. Switch to the Tetram setting and make sure that the range is set to 1.2 nA. Read the current on the cup and make adjustments to achieve the current reading they desire; this can be done with attenuators to get you in the ball park and the source slits to get more precise. A good practice to try at such a low reading is when you get to where you want the reading to be, insert FC0998. This will take beam off of 1102 and give you a chance to see if the reading that you are getting is from noise or is actually accurate. | ||
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| + | *Side note: If attempting very low beam current, pico range, and cup is not reading or is stagnant, open the 1102 Tetram page. Under the Control section, where Acquire is, click Done, then go back to Acquire. This should reset the cup and get a reading again. | ||
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task/sdt.txt · Last modified: 2025/10/09 18:39 by painter