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--- installation_fp_sci [2018/04/11 16:26]
pereira [Pumping focal-plane chamber]
+++ installation_fp_sci [2019/07/01 08:22]
pereira [Installation of focal-plane scintillator]
@@ Line 1: / Line 1: @@
 ====== Installation of focal-plane scintillator ======
+In June 2019, a new Turbo Pump with magnetically-levitating bearings (Leybold MAG 2200iP) was installed in the S800 focal-plane chamber. This pump has a dry-N line connected to it that is purging continuously the bearings. This creates an extra pressure in the foreline, which must be pumping down continuously. Therefore, it is critical turn off the turbo pump whenever the foreline valve needs to be closed.
+Instructions on how to vent/pump-down the focal-plane chamber are described below.
 ===== Vent focal-plane chamber =====
   * Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased
-  * Open the [[gas_handling_system#labview_control_program|Labview gas handling system]] and verify that there is no gas in the CRDCs and IC. Open valves **4** (IC supply), **5** (IC bypass), **6** (IC focal-plane bypass), **7** (Ion Chamber vent), **20** (CRDC supply), **21** (CRDC bypass), and **22** (CRDC focal-plane bypass) and **23** (CRDC vent). The rest of the valves should be closed
+  * Open the [[gas_handling_system#labview_control_program|Labview gas handling system]] and verify that there is no gas in the CRDCs and IC. Make sure that the only open valves are **4** (IC supply), **5** (IC bypass), **6** (IC focal-plane bypass), **7** (Ion Chamber vent), **20** (CRDC supply), **21** (CRDC bypass), and **22** (CRDC focal-plane bypass) and **23** (CRDC vent). The rest of the valves should be closed
   * Ensure that the manual venting valve located on the south side of the chamber is closed (see figures below)  {{:wiki:fp-venting-valve-Daniel.jpg?350|FP chamber manual venting valve}} {{:wiki:fp-venting-valve.jpg?350|FP chamber manual venting valve}}
   * Ensure that the FP ion gauge (I264IG) is off (see details [[vacuum_control|here]])

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