Jordan, Gerardo, Travis, Marc, Fil, Janos - WP 12591 Today, starting at 8:00 am Gerardo and Jordan leak checked the HAM1 annulus system, by connecting a leak checker to the annulus pumping turbo, and of course valving out / switching off the annulus IPs. At first, the all-metal parts of the system have been checked, mostly on top of HAM1. Those were found OK. Then, the Y- door was checked with sniffing He in the leak checking grooves, then after a few seconds flushing it with Nitrogen. Y- door was found OK, too. Then, the Y+ door was checked with the same method, and the bottom half of it showed huge leaks. Therefore, the chamber needs to be re-vented, most likely the O-rings replaced, and the door reinstalled. This will take place tomorrow (06-06). In the meantime, IP3 was diagnosed, and troubleshooted. Travis and myself swapped the 2 HV cables on the Ion pump, and the same half of the pump remained functional, which indicated that there is a cable failure (together with the consequences of aLog 84761). So we pulled in a legacy H2 (former IP7) cable, and tested, but without success. Then Marc and Fil jumped in, and after a while we figured that in the MER we plugged the wrong cable in the controller, due to wrong cable labeling. In the end, Marc and myself went back into the LVEA, made sure that the LVEA-end of the currently plugged cable is indeed not connected, then we searched for the appropriate cable-end in the MER, plugged it in to the controller, and so now the IP is working again. The only last thing remaining is to valve it back in to the main volume.
Filiberto and I went to the mechanical room to look the different components on the vacuum racks, primarily the location of the ion pump controllers, and to our surprise we found the controller for IPFCC1, see trend for time it was off. Found that the power cable can be easily shaken off, we removed and replaced the power cable, much better fit with the new one. As power is restored the controller powered back on and restored high voltage to the pump.