Harry 00 31 6 150 123 28
Marcel 0299439619
Jochem
Version 3, juli 2005
Chamber in Voorportaal
- hook up gray RASNIK D25 connector in RasMux
- in MiniMasterMux under table (next to Mierik): swap DT3152/DT3162 connection: you need the `three coax cable´ cable.
- Start ICARAS on Mierik (desktop Icon). Select `BlackBox´ chl connection list
- Put 4 BlackBoxes on the Praxial Platforms. Cover chamber with black bags
- Check all BlackBox systems with View.
- Look with View to InPlane 1. Check if the proper RasCam works (sign!), and the two proper RasLeds. Do the same for InPlane 4. Remember that the monolayers within a multilayer form an arrow that points in the positive Z direction (for that chamber!)
- Take a round of 8 BlackBox and 4 InPlane systems. They should all be OK.
- Get InPlane calibration values from: http://www.nikhef.nl/pub/experiments/atlas/cosmicray/sag/sag.php. Copy all figures from the chambers into EXCEL file SagAdjust (on the Mierik Desktop). You get the target values (being 0.81 mm lower than the CAL values). Write down the Cal, Target and Found values in the paper logbook BEFORE the sag adjust.
- Adjust by means of wrench 24 the chamber sag. Usually 8/6 turn is OK. Only Y values InPlane systems 1 & 4 are relevant. The values are OK if they are within 0.07 mm from the target values.
- If OK: save images (check `image´ boxes), and take a final round. Write time in paper logbook. Uncheck these boxes straight after this round.
- Remove black bags & BlackBoxes. Fix four Vertical Alignment plates (of the same ChaPos!) , and two RasCam shieldings. Remove D25 RASNIK cable from the RasMux and tell X that the chamber can be placed in which ChaPos.
- Put the info concerning the chamber exchange in the E-logbook
Chamber in TestStation
- Make sure that the relevant HV channels are set at 100 V (or are off).
- Ch 28: ChaPos 0 ML1
- Ch 29: ChaPos 0 ML2
- Ch 30: ChaPos 1 ML1
- Ch 31: ChaPos 1 ML2
- Ch 32: ChaPos 2 ML1
- Ch 33: ChaPos 2 ML2
- Ch 34: ChaPos 3 ML1
- Ch 35: ChaPos 3 ML2
- Ch 36: ChaPos 4 ML1
- Ch 37: ChaPos 4 ML2
- Hook-up HV distribution cables between box and HV HedgeHog cards.
- Hook-up HV cables to HV dist. box (there should be only 100 V on these cables!).
- Check if there is current flowing @ 100 V. There is a broken wire if there is a trip, or 50A & 100V.
- Hook-up the Vertical Alignment RasCams and RasLeds.
- Make sure that the DCS power and CSM power are off. Hook-up:
- RasCams, RasLeds,
- Rasnik D25 cable to RasMux,
- ELMB (2x D15),
- power to CSM,
- one single and one double optical fibers to CSM
- Write the ELMB serial numbers and IDs in the paper logbook (`NewConfig´)
Starting up fresh pressurized chambers
- switch-on the ELMB power supply and the powers of the CSMs
- Start PVSS and register the new ELMBs (see doc; experts Robert Hart & Henk Boterenbrood)
- Perform JTAG procedure (see doc; experts Henk Boterenbrood, Ruud van Wijk and Jos Vermeulen)
- Select the proper frame grabber (D15 with single black cable) into the MiniMasterMux. Start RasDim, and start Rasnik from the PVSS panel. Select the usable channels in the sequence file
- Put the HV of freshly pressurized chambers to 3080 V. Check the currents.
- Start the DAQ with `cosray´. Inspect the data with `present´
- Write the `New Config´ info in the E-logbook.
- The HV can go to 3300 V if all is OK.
Gas
Flushing fresh chambers: assuming that the `old´ chambers have their valves closed
- Open the in- and output valves of the chambers to be flushed;
- Switch-on the gas control box. Open the `red handle´ valves, and open the `red-green´ valves. Don´t touch the reduction valve settings!
- Set the lower lip of the backpressure controller Helipot at 1.8 V. Check that gas flows at the window´s exhaust.
- Exchange 1.5 times the total volume of the chambers to be flushed. With the given gas flow of 1/3 m3/h, this takes 4.5 V hours, with V the total chamber volume to be flushed. A wide chamber is 1.5 m3, a narrow chamber 1 m3.
Pumping chambers (assuming that the chambers are being flushed)
- Set the lower lip of the backpressure controller Helipot at 6.00 V, and switch back to monitoring the gas pressure. The measured pressure voltage should increase 1 mV in about 8 s for each chamber to be pumped, thus 24 s for 3 large chambers.
- Check that the window output exhaust stopped.
- The chambers should arrive at 6.00 V after 2V/F (h), in which V is the total chamber volume (in m3), and F equals 0.33 m3/h. If not, a connection leaks (happens often!). This is found out quickly by touching the connections, and listening.
- After pumping, the measured pressure stays 6.00 V, and the window exhaust flows. If this situation will last a day or more, the in- and output valves of the `old` chambers are to be opened as well, thus sharing the fresh gas.
Running empty
After testing chambers, the chambers to be removed from the test station should have a pressure of about 1.5 bara (== 3 V). This is realised as follows:
- Turn down the HV of the to-be-removed chambers to 100 V.
- Stop the input gas flow by switching of the gas control box, and close the `red handle´ valves and the `red-green´ valves. Don´t touch the reduction valves!
- Close the input valves of all chambers, and close the output valves of chambers that will stay (under pressure) in the TestStation (like ChaPos 0 & 4). Leave the output valves of the chambers to be removed open.
- Set the lower lip of the backpressure controller Helipot at 3.00 V. Check that the window exhaust is flowing.
after several hours the pressure measurement will show 3.00 V. Since the backpressure controller will stop the output flow, but leaks a little, the pressure will slowly drop in time.
- First record the measured pressure in the paper logbook, then close the output valves of the emptied chambers.
- Check if the current through the emptied chambers (@ 100 V!) is still zero. Record this `final 100 V test´ in the paper logbook.
- Tell Gerrit/Rene/Edward that the chambers can be removed.
Please email ennesp@nikhef.nl for additions...
