David raised the bias to 49.5kV. Module is still sparking mainly on top. Humidity is super high.

Wednesday, July 10, 2019, 09:50 : sitting at 49.7kV for a coupe mins, big spark in vacuum took everything down.

Wednesday, July 10, 2019, 10:16 : Bias at 50kV drawing 0.1mA but looking pretty jumpy. Left it here for ~5 mins then had to turn down bias for TH work.

Wednesday, July 10, 2019, 13:33 : Back at 50kV on bias with no problems.

Wednesday, July 10, 2019, 13:46 : 10 mins at 50kV, will try to go a bit higher

Wednesday, July 10, 2019, 14:06 : Everything sparked off while sitting at 50.6kV. This seems a bit futile....

Wednesday, July 10, 2019, 14:15 : Back at 50.1kV with no problems

 Wednesday, July 10, 2019, 14:33 : Up to 51kV

Wednesday, July 10, 2019, 15:20 : Difficult to go above 51.4. Turning up EZL since there were a couple sparks to it. -> Putting this up causes significant sparks between HV bias and EZL in vacuum at 5kV on the EZL, 51.1kV on bias. Leaving EZL @ 5kV

Wednesday, July 10, 2019, 16:04 : Around 52.2 sparking on the top of the module

Wednesday, July 10, 2019, 16:36 : 53kV

Wednesday, July 10, 2019, 17:16 : up to 54kV without much trouble

Wednesday, July 10, 2019, 17:53 : Sitting at 55kV for about 4mins when a spark tripped off everything. Will try to bring it back to sit stable at 55kV tomorrow

Thursday, July 11, 2019, 10:28 : TM4 up to 54.9kV without too many problems, EZL at 25kV. Will sit here for a little while

Thursday, July 11, 2019, 10:48 : 20mins at 54.9kV, going to 55kV

Thursday, July 11, 2019, 11:14 : 25 mins at 55kV and everything sparked off

Thursday, July 11, 2019, 11:26 : Back up to BIAS / EZL = 54.8kV / 26kV. Checked that the TGHT and TBHT power supplies have not been killed by sparks, everything looks fine.

Thursday, July 11, 2019, 12:56 : Sat at 49.6kV for 1.5hrs with one spark.

Thursday, July 11, 2019, 14:02 : Been sitting at 55kV for 2 hrs now with one spark.

Friday, July 12, 2019, 08:09 : Back up to 52kV easily, then had to reduce step size to 100V to keep going

Friday, July 12, 2019, 08:47 : 56kV

everything sparked off at 56.5 or so