The Polarized Target Maintenance Record needs to be taken by the target operator during the day shift every day or every other day. 

Target Maintenance Record:

Ensure to record parameters' values on the SpinQuest_Polarized_Target_Parameters spreadsheet: https://docs.google.com/spreadsheets/d/1rVhYVyClAVFNEt_vyj8aQ8GLVS3DRL51QKbansgkOr8

This spreadsheet holds the information below: 

• Outside NM4 tanks (gaseous helium (gHe) and liquid nitrogen (LN2)) level. 

Outside gaseous helium tank

If this pressure reading drops below 45 psig, immediately check with the Target Expert. You can also 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 for 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

If this level is below 24 In.H2O, please follow the steps to order LN2 refills for the tank, gHe tube-trailer, LN gHe cylinders, and LN2 portable Dewars at FNAL to arrange a refill.

• 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 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 of two cylinders for both is 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. 
• 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.  

For the following record, take it daily or every other day, but if you cannot access the NM4 Experimental Hall during the beam operations, you can skip the following parameters. You can record the following parameters during the beam operations when you make access to change the target insert. 

• Check the HR3 parameters on the HR3 like annotated in the pictures:

• 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 Prof. Dustin and Kun. If they let you email 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 above 55 psi, please inform us in the Discord channel. 

LCW accumulation bucket on Shielding blocks and the lower level of NM4:

Please contact Evan Niner and plan to empty this bucket because, during the beam operations, the target operator cannot empty this bucket due to the radiation.  

The following parameters you can monitor via strip charts:

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.

1. LCW

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.

The nominal values (as of 01/06/2024):

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

Both “LCW Supply” and “LCW Return” have a pressure gauge and a temperature gauge. 

The nominal values for the outlet LCW temperatures from the QT coldhead compressors should be below 100 Fahrenheit (see the image below)
If you notice this increase above 105 Fahrenheit, then the coldhead compressors can be tripped at any time, so coordinate with the Target Expert on Shift.

You can monitor these outlet flow from the strip charts remotely, and a sample screenshot is shown below.