# RPCs R&D Meeting - 10/09/2025
##### Present: Beatrice, Mattia, Max, Roberto, Stef
#### Discussed:
- __Fluorine Measurements for RPC6 with Ar__
- the detector is always switched on (2175 V) except in the weekend
- electrode is placed in only throughout the day (~7/8 h)
- [ ] continue the test on RPC 6's fluorine clean-out -> Stef
- [ ] after the detector seems clean - to flush the Standard Gas Mixture
- __Lab256__
- [ ] prepare a table with all the mixtures we took in lab & gif, updated with the correct concentrations -> Max
- [ ] check how to flag in the database that the old data is taken with reduced amounts of SF$_6$
- [ ] check with MCA if we could bring the old LHCb GC to the lab
- there is still the problem of the charge distribution being shifted to lower values
- [ ] continue testing Gian's Amolea and take the 0.1% SF$_6$ too and to think what else we miss with the corrected %
- [ ] to switch the frames of 21 and 28
- [ ] prepare a summary for the R-134a reclaimed measurements -> Stef
- [ ] prepare a summary for the i-C$_4$H$_{10}$ measurements -> Mattia
- [ ] test 50/50 + 0.3% SF$_6$ then try to reduce the R-134a at 25/30%
- [ ] then, replace the R-134a with CO$_2$
- [ ] make a table with the expected values for the Standard Gas Mixture for a 2 mm gap (WP, SP, Av. Charge, ..)
- [ ] to check in FLUIDAT the difference in SF$_6$ % for different pressures
- [ ] see what other high voltage modules are available
- [ ] preparing the set-up for the n-pentane
- GIF++
- [ ] GC measurements
- [ ] finish the GC calibration
- [ ] check reduced SF$_6$ in the Standard Gas Mixtures
- [ ] then 30% CO$_2$-based gas mixtures (first the 0.5% SF$_6$)
- [ ] consider re-calibrating the MFCs once the GC measurements are finished
General points:
- [ ] Windows 10 PCs to check if they need to be updated
- [ ] refrigerant bottles contain oil - to check with the supplier (Linde)
- [ ] give the pipe from GIF that presented impurities to Benoit for testing
https://codimd.web.cern.ch/mDc77QulT1WB9pR0hxa4Rg?both
