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playground:alpha [2010/07/16 20:26] 184.57.89.126 |
playground:alpha [2010/07/16 20:28] 184.57.89.126 |
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** 3He operation ** | ** 3He operation ** | ||
- | This assumes the source is running on 4He already and that the regulator on the 4He bottle is set for no more than 5 psig. | + | This assumes the source is running on <sup>4</sup>He already and that the regulator on the <sup>4</sup>He bottle is set for no more than 5 psig. |
Turn down the source gas until the pressure on the source tc gauge is ~10 microns.� Stop pressing the button when the pressure is 100 microns to allow the tc gauge to catch up.� The pressure response is delayed.� Do not over-drive the source gas control as it could damage the leak valve. | Turn down the source gas until the pressure on the source tc gauge is ~10 microns.� Stop pressing the button when the pressure is 100 microns to allow the tc gauge to catch up.� The pressure response is delayed.� Do not over-drive the source gas control as it could damage the leak valve. | ||
- | Go out to the vault and make sure a 3He bottle is ready for use. It MUST have its main valve closed at this point. | + | Go out to the vault and make sure a <sup>3</sup>He bottle is ready for use. It MUST have its main valve closed at this point. |
- | Shut off the manifold valve near the floor that is connected to the 4He. | + | Shut off the manifold valve near the floor that is connected to the <sup>4</sup>He. |
Start the roughing pump that is attached to the manifold and open the manifold valve leading to the pump. | Start the roughing pump that is attached to the manifold and open the manifold valve leading to the pump. | ||
- | Open the manifold valve to the 3He regulator, also open the valve on the regulator output. | + | Open the manifold valve to the <sup>3</sup>He regulator, also open the valve on the regulator output. |
Rough for a minute until the TC gauge on the pump is about 10 microns. | Rough for a minute until the TC gauge on the pump is about 10 microns. |