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Ensure to record parameters' values on the SpinQuest_Polarized_Target_Parameters spreadsheet: https://docs.google.com/spreadsheets/d/1rVhYVyClAVFNEt_vyj8aQ8GLVS3DRL51QKbansgkOr8
The above spreadsheet needs to be kept updated one day or every other day. This spreadsheet holds the information below:
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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
If there is a need to arrange the gHe tube trailer to refill, 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
Outside Liquid Nitrogen (LN2) tank
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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:
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- 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. During beam operations, we cannot put the LN2 portable dewar in the NM4 hall.
- The material (CH2/CD2 & NH3 (10g)) is filled 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.
- Checking the ODH sensors reading for the NM4 hall (for cryo platform) and NM4 ground level (for NM3). Please put the reading for four sensors, two for the cryo platform (ODH 1 & ODH 2) and two for NM3 (ODH 1 & ODH 2), in the above spreadsheet.
The normal reading is 20.8. If it is changing plus or minus 0.3, then first inform to Prof. Dustin and Kun. If they let you to send an email to Evan and Kim (overhage@fnal.gov) then do that.
- Recording the pressure gauge value for the LCW supply to the Roots pump. Please see the following pictures, whose value needs to be recorded in the above spreadsheet.
- Note: If the pressure values go below 50 psi or goes above 55 psi, please inform in the discord channel.
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You can make various viewpoints of the full system strip charts using this page: https://e906-gat1.fnal.gov/data-summary/e1039
The Target TV page 'https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php' gives you an overall idea about the full system (but not all the parameters).
In addition to the "Target TV", there are two dedicated pages designed for the convenience of Target Operator / Target Helper.
1. https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-helper.php
2. https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-helper-2.php
Let's go through the sub-systems.
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Two target sub-systems use LCW (Low Conductivity Water) for cooling.
1. Helium Liquefier System (UVA-QT): see QT System Manual for more details.
2. Roots pump-system: see Roots Pumps System Manual for more details.
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The nominal values (as of 01/06/2024):
Parameter | Avg. Value |
|---|---|
| Inlet Pressure | ~ 65 psig |
| Outlet Pressure | ~ 48 psig |
| Inlet Temperature | ~ 79 Fahrenheit |
| Outlet Temperature | ~ 89 Fahrenheit |
IMPORTANT: if you notice there is no LCW flow, then notify the Target Expert IMMEDIATELY, to stop the coldhead compressors and the roots pumps.
Also, if you notice any of the following you will have to coordinate with the Target Expert to perform the later mentioned steps.
* Lower inlet pressure
* Higher inlet temperature
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The top-left plot shows the IVC https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php
3. UVA-QT System
The most important things to frequently check:
1) LCW supply (see the section 1 above).
2) LCW outlet temperatures from the coldheads (see the section 1 above).
3) HR3 status (should be always running in the LOAD mode): see HR3 Manual for more details. The arrow shown on its display should be a "SOLID-ARROW", not "HOLLOW-ARROW"
You can check its status by plotting "HR3 Enabled" from the strip-charts https://e906-gat1.fnal.gov/data-summary/e1039/target-all-auto.php,
and it should be the value "-1" when it is running, and "0" when it is off.
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On the strip charts,
1) Ensure both Liquefiers are producing LHe. Check the top-right plot in the https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php.
2) Ensure the purifier has LN2 level above 75%. Check the top-middle plot in the https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php.
If the level is below 75%, then perform a refill using the procedure: docdb 10337
3) Check the difference between the parameters "Outside gHe tank(psig)" and "PT501 (A or B or both)" using https://e906-gat1.fnal.gov/data-summary/e1039/target-all-auto.php
If the difference is above 65 psig, then that indicates that the purifier needs cleaning / regeneration.
Follow Cleaning QT purifier Helium-space (pumping-purging the purifier) procedure with the Target Expert.
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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
If there is a need to arrange the gHe tube trailer to refill, 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
7. Outside Liquid Nitrogen (LN2) tank
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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.
8. Gaseous helium, nitrogen cylinders supplies and Liquid Nitrogen portable dewars supply
There should be at least two cylinders from each gas type (gHe and gN2), and two portable LN2 dewars available at all times.
Please follow the steps mentioned in How to order LN2 refill to the tank, gHe tube-trailer, LN gHe cylinders, and LN2 portable Dewars at FNAL to proceed with ordering.