UMN CDMS Wiki archive
start › cdms › k100 › run_summary › run_73 › reduce_gain

Table of Contents

Reduced gain

The gain of the phonon channels is very low in this run compared to Run 72 (at 0 Volts).

The first data was taken with the pi filters removed. Later they were replaced.

First comparison:

Blue: Run73 07200725_0812; Red: Run72 07200304_1033
DCRC(4)
DCRC(1)/(3)
PTOF spectra comparing R73 to R72 0-volt data, showing how much lower the amplitudes are in the current run, for almose all channels.
Top row is DCRC4, bottom is DCRC3. Note that one DCRC4 channel seems to be behaving normally. Maybe DCRC3 is acting screwy.
data series Tower temperature QET biases
Run72 07200304_1033 55.7 mK (na/360/430)/(360/420/440)
Run73 07200725_0812 53.4 mK (0,330,360)/(380,400,460)
Note that PD was set significantly lower in this run, which may account
for it's comparatively high gain. So maybe it's not a DCRC thing, maybe
it's affecting all channels

After matching QET biases:

Blue: Run73 07200725_0812; Red: Run72 07200304_1033
DCRC(4)
DCRC(1)/(3)
PTOF spectra comparing R73 to R72 0-volt data, showing how much lower the amplitudes are in the current run, for all channels.
Top row is DCRC4, bottom is DCRC3. Note that one DCRC4 channel seems to be behaving normally. Maybe DCRC3 is acting screwy.

After matching QET biases and DCRCs:

Blue: Run73 07200725_0812; Red: Run72 07200304_1033
DCRC(4)
DCRC(1)
PTOF spectra comparing R73 to R72 0-volt data, showing how much lower the amplitudes are in the current run, for all channels.
Top row is DCRC4, bottom is DCRC3. Note that one DCRC4 channel seems to be behaving normally. Maybe DCRC3 is acting screwy.

After matching QET biases and DCRCs AND REPLACING PI FILTERS:

DCRC(4)
DCRC(1)
PTOF spectra comparing R73 to R72 0-volt data. Amplitudes are higher after replacing pi filters.
DCRC(4)
DCRC(1)
Noise PSDs comparing R73 to R72 0-volt data. Noise is lower after replacing pi filters.