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Outside gaseous helium tank
If this pressure reading gets below 45 psig, then IMMEDIATELY check with the Target Expert. You can check this pressure remotely using the strip charts.
https://e906-gat1.fnal.gov/data-summary/e1039/target-all-auto.php
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Outside Liquid Nitrogen (LN2) tank
If this level is below 24 In.H2O, then please follow the steps on How to order LN2 refill to the tank, gHe tube-trailer, LN gHe cylinders, and LN2 portable Dewars at FNAL to arrange a refill.
- Check the HR3 parameters on the HR3 like annotated in the pictures:
- Checking the number of gaseous helium (gHe) and gaseous nitrogen (gN2) bottles in the outside NM4 gas rack. To confirm their number, check the labels (Helium for gHe and Nitrogen for gN2) on the cylinders. To check whether these cylinders are empty or filled. You can check their tags on or check from their caps; if there is blue wrapping inside the cap on the opening valve, these cylinders are filled; if not, they are empty. Note: The minimum two cylinders for both of them are enough; if it is lower, then check with the target expert to place an order.
- Checking the LN2 portable (180L) dewars. Note: If snow falls, we must put the LN2 portable dewar inside the NM4 hall near the loading dock because, due to cold, the 22 psi relief valve on the dewar will freeze and keep venting all the time, which will empty the dewar soon. We cannot put the LN2 portable dewar during beam operations in the NM4 hall.
- Filling the material (CH2/CD2 & NH3 (10g)) dewar with LN2 in the target preparation/handling area. This activity should be performed weekly. Check with the target expert for the week and arrange the material dewar refill with LN2.
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