Comparison of CDMS [100] and [111] Oriented Germanium Detectors

Journal Article · Fri Sep 14 00:00:00 EDT 2012 · J.Low.Temp.Phys. 167:1106-1111,2012

DOI:https://doi.org/10.1007/s10909-011-0427-0· OSTI ID:1050859

Leman, S W; Hertel, S A; Kim, P; Cabrera, B; Figueroa-Feliciano, E; McCarthy, K A; Resch, R; Sadoulet, B; Sundqvist, K M

The Cryogenic Dark Matter Search (CDMS) utilizes large mass, 3-inch diameter x 1-inch thick target masses as particle detectors. The target is instrumented with both phonon and ionization sensors and comparison of energy in each channel provides event-by-event classification of electron and nuclear recoils. Fiducial volume is determined by the ability to obtain good phonon and ionization signal at a particular location. Due to electronic band structure in germanium, electron mass is described by an anisotropic tensor with heavy mass aligned along the symmetry axis defined by the [111] Miller index (L valley), resulting in large lateral component to the transport. The spatial distribution of electrons varies significantly for detectors which have their longitudinal axis orientations described by either the [100] or [111] Miller indices. Electric fields with large fringing component at high detector radius also affect the spatial distribution of electrons and holes. Both effects are studied in a 3 dimensional Monte Carlo and the impact on fiducial volume is discussed.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1050859
• Report Number(s): SLAC-PUB-15000; arXiv:1108.6245; TRN: US1204675
• Journal Information: J.Low.Temp.Phys. 167:1106-1111,2012, Vol. 167, Issue 5-6; ISSN 0022--2291
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CLASSIFICATION
CRYOGENICS
ELECTRIC FIELDS
ELECTRONS
GE SEMICONDUCTOR DETECTORS
GERMANIUM
IONIZATION
MILLER INDICES
NONLUMINOUS MATTER
PHONONS
SENSORS
SPATIAL DISTRIBUTION
SYMMETRY
TARGETS
TRANSPORT
Astrophysics
Experiment-HEP
Instrumentation
ASTRO
HEPEX
MATSCI