CLAS12 R1 Progress Reports
1) Dial toll free, 866-740-1260 2) Enter the 7 digit Access Code, 6074391, followed by the "#" key.
or if the DAQ computer is at the IAC
service httpd start
Clean room Prep
Clean room Construction 2011
Jlab Shipment 8/8/2011
Jlab Stringing Prep
Epoxy Ratio 2.33:1 (Epon 828 Resin : Versamid 140).
12/3/12 Meeting Notes with Mac and George at ISU
Chambers outside cleanroom should have covers to keep dust off buss wires
Cap 113 (Brown one) needs to be replaced on STB board.
Need 2 amp fuse on 5 Volt supply to pre-amps.
operate chamber STB voltage at 6 Volts
Chamber grounding (ground through HV cable)
Chamber operating procedures
1.) post amplifier in VME crate had 150 mV peak-peak noise
2.) Stop using the current ADB crate
3.) New nominal Voltages from Mac are
S:F:G = 1300:-650:
S/F = 2
S/G = 5/7
Signal output doubles every 75 Volts difference between sense and field
4.) Discriminator level for signals:
5.) Need to lower the HV trip current back to 1 microA. May increase it to 5 micro Amps when burning in.
6.) Change trip speed to 0.1 sec
1.) Install cover on top of chamber, top could be made from home insulation sheets that has been covered with paper or plastic sheeting.
2.) Install 208 Volts for ADB crates that will be sent by JLab to replace the one they have given us.
3.) solder jumpers onto HV boards, install them in January when George returns
4.) Mylar window on S1 chamber needs to have some tape and weather stripping redone or modified
5.) Get allen head 3/32 for torque wrench, remember to replace brass screws if they are removed for some reason
6.) do not do final instrumentation, purge covers, and dust covers on the last 2 chambers until checking with JLab, the may want to survey them after delivery
1.) What are the fault conditions on the STB board when the power supply exceeds voltage/current
2.) Need signal cables with strain relief connects that have the shielding wrap grounded on the STB board but not grounded on the DAQ cabinet
3.) George will send purge covers and come back in January to install
Plan: Lift chambers + Pallets out of Physics and carry them to ISU's loading dock using a fork lift on Wednesday January 8 when ISU is on Thanksgiving break. The chambers will be stored inside a heated building over thanksgiving break and be ready for pickup.
Rick at Partner Steel needs to be called in December with a final date
A fork lift reservation needs to be confirmed with Wade in December.