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installation_fp_sci [2019/07/01 09:46]
pereira [Pumping focal-plane chamber]
installation_fp_sci [2019/12/10 20:26] (current)
pereira [Vent focal-plane chamber]
Line 5: Line 5:
 Instructions on how to vent/​pump-down the focal-plane chamber are described below. Instructions on how to vent/​pump-down the focal-plane chamber are described below.
 ===== Vent focal-plane chamber ===== ===== Vent focal-plane chamber =====
-  * Open the [[hv_bias|HV Remote Control]] GUI and ensure that the focal-plane detectors are unbiased+  * Open the [[hv_bias|HV Remote Control]] GUI and ensure that the gas focal-plane detectors ​(both CRDCs and the Ion Chamber) ​are unbiased 
 +  * Make sure that the CRDC grid gate is off (HV is in dU6) 
 +  * Make sure that the CRDC preamps and interface boards are turned off (it is located in the NIM crate attached to the S800 focal-plane chamber) 
 +  * In order to avoid condensation from the cooling system, turn off the chiller sitting under the S800 focal-plane chamber. Wait for at least a couple of hours before venting the chamber.
   * 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   * 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 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}}
installation_fp_sci.1561988768.txt.gz · Last modified: 2019/07/01 09:46 by pereira