Photomultiplier tube calibration for the Cubic MeterDark Matter Time Projection Chamber; Photomultiplier tube calibration for the Cubic MeterDMTPC.
2015
This thesis concerns measurements I performed on
photomultiplier tubes (PMTs) and lenses to be used in the Cubic
Meter Dark Matter Time Projection Chamber (DMTPC) experiment. DMTPC
is a new generation of detector, which takes the idea of a standard
time projection chamber and adds in some additional optical
elements, such as CCDs and PMTs. The goal of DMTPC is the
directional detection of the dark matter. During the course of my
measurements, I characterized both the absolute gains of DMTPC's
eight PMTs, as well as the dark currents exhibited by each of the
PMTs. Seven of the eight PMTs demonstrated gains on the order of 10
6-10 7, and one PMT did not function at all. Of the seven working
PMTs, six of them had dark currents under 10 kHz, and one had an
excessively high dark current over 10 kHz. These gain values for
the PMTs will give DMTPC the means to measure the Z dimensions of
the particle tracks it intends to image, and thus when combined
with the information from the CCDs will allow for full track
reconstruction. DMTPC will use lenses on their CCD cameras, and I
also measured the transparency of these lenses, and discovered that
they are opaque below approximately 350nm. These measurements will
be essential for DMTPC, because they will provide information about
the relative amounts of light the PMTs and CCDs on the detector
will register, and thus provide key information for track
reconstruction.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
0
References
0
Citations
NaN
KQI