Gas Cool-Down Method and Test Mass Curves Study

Diagrams and data charts illustrate the N2 gas cool-down method and test mass curves study conducted by Jaimi Salone and Edgard Bonilla on 08/28/18. The study focuses on maintaining pressure internally, cooling down the test mass efficiently, and achieving successful outcomes in pressure control across different components of the system.

• Gas Cool-Down
• Test Mass Curves
• Pressure Control
• Diagram Study
• Cryo-System

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1. N2 Gas Cool-Down Method Jaimi Salone & Edgard Bonilla 08/28/18

2. Final Configuration: 8/28/18 2

3. PF1: Pressure Gauge inside inner shield PF2: Pressure Gauge on Reservoir PF3: Pressure Gauge on ADP 81 PF4: Pressure Gauge on Small Turbo (Interior) PF5: Pressure Gauge in Main Chamber Target Pressures Cryo-System Diagram Sensor Readout/Control LN2 Outlet Outer Shield Sensor Readout/Control 1.5*10-4 Torr 3*10-2 Torr PF5 Blue Dewar (LN2) Temp Sensor Optic small turbo pump PF1 10-3 Torr V15 system: shut-off V14 system: calibrated leak PF4 Inner Shield Pump valve Heat Gun vent PF2 fill Heating Tray vent PF3 Scroll Pump Vacuum Chamber 10 Torr ADP 81 Reservoir 3 J. Salone 08/23/18

4. LN2 inlet Thermal links Shield Diagram (View from top with inner shield closed) Outer shield 8.5 Inner shield 1.5 8.5 11 3 3.75 2.625 Outlet to small turbo pump 1.25 Inlet on outer shield 1.625 11 *Electric feedthrough not included in diagram Inlet on inner shield 4 J. Salone 08/28/18

5. Shield Diagram 11 Copper nitrogen piping LN2 inlets for shields Gaseous nitrogen inlet 11 3 Small Turbo Pump outlet Left side 14.25 *Electric feed-through not included in diagram. 3.75 2 4.25 8 3 6.5 3.625 5 J. Salone 08/28/18

6. Goals for gas run: Maintain Pressure internally: still need to retrieve data 1.5 E-4 Torr in Chamber Appears to maintain in 1.5 E-4 Torr range +/- 5E-5 , and lower, virtually the whole test. 10 Torr for the Reservoir The component with the most human interaction. We tried to keep it between 13 and 8 Torr the whole time. Less important so long as Inner Shield pressure is constant. 3 E-2 Torr in the Inner Shield Adjusted Reservoir specifically to maintain this pressure, appeared +/- 1.5E-2. 1 E-3 Torr for the Small Turbo Great success, stayed in the E-4 range the whole time. Didn t bust the Small Turbo! Cool down the test mass faster: clear results 8/28/18 6

7. Radiative Cool-Down: 8/28/18 7

8. N2 Gas Cool-Down: 8/28/18 8

9. Test Mass Curves: 8/28/18 9