Noise problem seems like fixed after remaking the Al foil cover.

Run 1208

Gas pocket: ON (thinkness 9mm)

Fields: drift 200 V/cm, extraction 3.78 kV/cm

Threshold: 500 ADCc below baseline

Coincidence: 3

Trace length: 100us total, 50 us pre-trigger

Threshold extend:  5x16 = 80ns

TPC Pressure:  30 mbarg

SiPM HV: 65 V

Number of events: 20k

Run 1209

Gas pocket: ON (thinkness 9mm)

Fields: drift 200 V/cm, extraction 3.78 kV/cm

Threshold: 500 ADCc below baseline

Coincidence: 3

Trace length: 100us total, 50 us pre-trigger

Threshold extend:  5x16 = 80ns

TPC Pressure:  30 mbarg

SiPM HV: 65 V

Number of events: 20k

At the end of run 1209, a lot of noise show up again.