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installation_fp_sci [2017/03/06 12:28]
pereira [Vent focal-plane chamber] |
installation_fp_sci [2017/03/06 12:31]
pereira [Installing FP scintillator] |
| ==== Open focal-plane chamber ==== | ==== Open focal-plane chamber ==== |
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| - After venting the FP chamber, there might still be some pressure differencial. This can be corrected by "forcing" the chamber flange {{:wiki:screwdriver-flange.jpg?350}} | * After venting the FP chamber, the pressure inside the chamber is slightly above atmospheric due to the dry N2 pumped. Before opening the chamber, it is recommended to vent the extra N2 by "forcing" the chamber flange with e.g. a screwdriver {{:wiki:screwdriver-flange.jpg?350}} |
| - Unlock the padlock protecting the power brakers of the switch controls to open the chamber, and press the **START** button {{:wiki:padlock-note.jpg?350|Padlock}} | * Unlock the padlock protecting the power brakers of the switch controls to open the chamber, and press the **START** button {{:wiki:padlock-note.jpg?350|Padlock}} |
| - Turn the switch to open the clamps holding the FP chamber. The weight held by the hydraulic piston will increase {{:wiki:switch-clamps.jpg?250|Switch clamps}} {{:wiki:clamps.jpg?400|Clamps holding FP chamber}} {{:wiki:scale.jpg?350|Scale FP chamber}} | * Turn the switch to open the clamps holding the FP chamber. The weight held by the hydraulic piston will increase {{:wiki:switch-clamps.jpg?250|Switch clamps}} {{:wiki:clamps.jpg?400|Clamps holding FP chamber}} {{:wiki:scale.jpg?350|Scale FP chamber}} |
| - Turn on the switch to activate the motor opening the chamber. It takes about 10 minutes to get the chamber totally opened {{:wiki:fp-chamber-motor.jpg?250|Motor switch to open FP chamber}} | * Turn on the switch to activate the motor opening the chamber. It takes about 10 minutes to get the chamber totally opened {{:wiki:fp-chamber-motor.jpg?250|Motor switch to open FP chamber}} |
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| ==== Installing FP scintillator ==== | ==== Installing FP scintillator ==== |
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| - The figure below shows the FP chamber open, with the "old" FP scintillator to be replaced by the new one {{:wiki:E1-view.jpg?350|FP chamber opened}} | * The figure below shows the FP chamber open, with the "old" FP scintillator to be replaced by the new one {{:wiki:E1-view.jpg?350|FP chamber opened}} |
| - Unplug the bases of the up and down phototubes. The platic tie holding the cable of the up phototube to the chamber needs to be cut {{:wiki:e1-up-Daniel.jpg?400|UP base phototube}} {{:wiki:e1-down-closeup.jpg?250|DOWN base phototube}} | * Unplug the bases of the up and down phototubes. The platic tie holding the cable of the up phototube to the chamber needs to be cut {{:wiki:e1-up-Daniel.jpg?400|UP base phototube}} {{:wiki:e1-down-closeup.jpg?250|DOWN base phototube}} |
| - Using an allen wrench, unscrew the two bolts attaching the scintillator frame to the base of the chamber {{:wiki:e1-frame-bolts.jpg?350|Scintillator frame}} | * Using an allen wrench, unscrew the two bolts attaching the scintillator frame to the base of the chamber {{:wiki:e1-frame-bolts.jpg?350|Scintillator frame}} |
| - Climb to the chamber and pull the scintillator frame up. Once unplugged, handle it to a second person {{:wiki:Daniel-Jorge-1.jpg?350|FP chamber opened}} {{:wiki:Daniel-Jorge-2.jpg?350|FP chamber opened}} | * Climb to the chamber and pull the scintillator frame up. Once unplugged, handle it to a second person {{:wiki:Daniel-Jorge-1.jpg?350|FP chamber opened}} {{:wiki:Daniel-Jorge-2.jpg?350|FP chamber opened}} |
| - With the help of a second person, hold the new scintillator by its frame and place it in the right spot. A second person should be ready to screw the frame to the base of the chamber | * With the help of a second person, hold the new scintillator by its frame and place it in the right spot. A second person should be ready to screw the frame to the base of the chamber |
| - Connect the bases of the up and down phototubes. The later is quite difficult because one cannot see the pins | * Connect the bases of the up and down phototubes. The later is quite difficult because one cannot see the pins |
| - Using a plastic tie, attach the cable of the up phototube to the scintillator frame | * Using a plastic tie, attach the cable of the up phototube to the scintillator frame |
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