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--- installation_fp_sci [2023/02/17 20:12]
pereira [Pumpdown of FP Chamber]
+++ installation_fp_sci [2023/02/17 20:45]
pereira [Pumpdown of FP Chamber]
@@ Line 43: / Line 43: @@
   - If the TMP is off and Foreline Valve (FV) is closed, open the Roughing Valve (RV) briefly (2 seconds) by clicking **Open** and observe the behavior of the pressure gauges. If they all decrease at the same rate, again click **Open** to begin rouging out the chambers.
   - If the TMP is still on (this could be the case for a short vent period), turn it off and close the foreline valve (FV) before doing step 6.
-  - When the BPG reads zero, **Close** RV and **Open** FV. Turn the TMP on if it is not already. When the TMP is “at speed” **Open** the TGV. If the TMP was off before opening the TGV, the chamber pressure may have risen to a point where the TGV closes automatically. If the BPG still reads < 1 Torr, attempt to **Open** the TGV again.
+  - When the BPG reads below 200 mTorr, **Close** RV and **Open** FV. Turn the TMP on if it is not already. When the TMP is “at speed” (~30,000 RPM), **Open** the TGV.
+  - NOTE: before TMP reaches "at speed", pressure in the chamber, as read by BPG, might increase to a point where TGV can not be open. If that is the case, turn off the turbo pump, close FV, and repeat steps 6, 7, 8 but this time, wait for BPG to read below 100 mTorr. Then try again step 8.
   - Allow the TMP to pump on the system until the IG reads < 1E-5 Torr.
   - On the “FP_State_Buttons” page click **RUN** to enter run mode.

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