This page covers the Target Operator's checklist.

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

If you are on the cryo-platform, take the stairs (towards the lower level) and stop mid-way when you see these gauges towards the east wall of the hall.
You will see labels ”LCW Supply” and “LCW Return” on those two separate piping.

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.

The nominal values for the LCW for the roots pumps system should be as shown in the following pictures.
Location: at the roots-pumps (cryo-platform: westbound)

                                          Note: The 2nd flow meter from the right is from the rotary vane pump and it usually takes about 5-10mins to show a flow after it is started.

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

2. Insulation Vacuum Chamber (IVC)

This is the vacuum space of the superconducting magnet. When the system is running/operational, the IVC should be below 9 x 10E-6 Torr.
If this value goes above 1 x 10E-5 Torr, then IMMEDIATELY contact the Target Expert to fix it.
Note: during magnet LHe fills, LN2 fills, and fridge fills this IVC can fluctuate but it should go back to below 9 x 10E-6 Torr soon.

These are the possibilities for increasing IVC
1) The backing pump is off or not running: you will need to access NM3 and get it started while monitoring IVC.
2) The turbo pump is off or not running: you will need to access NM4, and check the turbo status from its controller at the slow controls rack, clear any alarms/error messages, and start it.
     The one on the left (TPG361) is the IVC readout device, and the one on the right (DCU 600) is the controller for the turbo pump. The nominal rotation frequency of DCU600 is 660 Hz (set value (upper), and actual value (lower) are displayed on that screen #309).

3) The IVC readout can have failures. You may need to restart it if needed. There is a switch on the back of that TPG361 readout device (see the left-hand side module of the above picture) to turn ON/OFF. Then you will need to LONG PRESS the UP arrow to get the reading on the display.
3) A leak in the piping:  you will need to access the cave and check the piping, the check valve (red one on the magnet surface, north side)
4) The fridge pressure also maybe keep increasing. Check whether the roots pumps are running, if not start them.
5) A sudden power outage: IMMEDIATELY contact the Target Expert and have the backup power setup running and start the backing pump and turbo pump while monitoring the IVC pressure.

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.
     

4) Check the Compressors' status. There are 10 coldhead compressors as two arrays on the east-side of the cryoplatform. Each array of compressors corresponds to a liquefier (A: bottom-row, B: top-row).
     Essentially, each compressor screen should show "EASYCOOL", but no "ALARMS" or "ERRORS" in the operational conditions.
   

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.
    

Roots pumps setup

Checking two gHe bottles’ levels on the west-wall of the cryoplatform

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

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

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.

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.

Target Materials