HWR Resonance control cables
There is still confusion about cables.
From Joe's notes.
Powered up cavity #5 at low power, and began calibration process, locked onto cavity, field < 1 MV/m. However the tuner did not function (see Phil's entry # 174633), though the cavity frequency was close enough so that adjusting he LO frequency allowed the system to lock on. Investigation of the tuner issue was not fruitful, so we decided to change to cavity #4. Saw the same behavior with cavity 4 - able to power up (low power, 20W), and lock to the cavity, establish field. But tuner did not function (no change in frequency observed). Also we didn't see the pressure transducer output voltage change. So more investigation is needed to understand what is going on. We were able to successfully operate the tuner for cavity #3 last week, Also all tuners were checked out and run over their entire ranges (> 100kHz) at 2K.
A few of us will meet tomorrow AM to discus the path forward. It may be likely that we move ahead with cavity characterization in SEL mode (with minor adjustment to LO frequency if required) so that we can establish cavity performance.