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CoGeNT employs p-type point-contact (PPC) germanium detectors to search forWeakly Interacting Massive Particles (WIMPs). By virtue of its low energythreshold and ability to reject surface backgrounds, this type of device allowsan emphasis on low-mass dark matter candidates (wimp mass of about 10 GeV/c2).We report on the characteristics of the PPC detector presently taking data atthe Soudan Underground Laboratory, elaborating on aspects of shielding, dataacquisition, instrumental stability, data analysis, and background estimation.A detailed background model is used to investigate the low energy excess ofevents previously reported, and to assess the possibility of temporalmodulations in the low-energy event rate. Extensive simulations of allpresently known backgrounds do not provide a viable background explanation forthe excess of low-energy events in the CoGeNT data, or the previously observedtemporal variation in the event rate. Also reported on for the first time is adetermination of the surface (slow pulse rise time) event contamination in thedata as a function of energy. We conclude that the CoGeNT detector technologyis well suited to search for the annual modulation signature expected from darkmatter particle interactions in the region of WIMP mass and coupling favored bythe DAMA/LIBRA results

CoGeNT: A Search for Low-Mass Dark Matter using p-type Point Contact Germanium Detectors