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Micro-machined Silicon Detectors

Abstract: This talk will present two novel detectors which are enabled by modern micro-machining techniques. The potential of micro-machined silicon as a radiation detector was first introduced by S. Parker et al. as radiation-hard detectors, often called 3-D detectors. We present a curved radiation detector. As vertex detectors for smaller inner beam pipe diameters are required; the planar nature of the detector becomes more and more of a problem. Both strip detectors and pixel arrays have been realized on a curved topography. We have demonstrated low-noise performance by successfully detecting low-energy gamma-rays with a curved strip detector. In addition to the curved detectors, we present 3-D detectors for use as thick gamma-ray detectors. Current room-temperature gamma-ray detectors are built in planar device architecture. We use micro-machining techniques to introduce vertical electrodes, which allow lateral charge collection, decoupling thickness and charge collection properties. The ultimate goal is the ability to form cm thick gamma-ray detectors. The vertical electrodes are micro-machined trenches with depth up to 1.7 mm in silicon. We present the basic detector structure, finite element simulations, and radiation measurements.
Speaker: Marc Christophersen - Naval Research Laboratory
Speaker Bio: Dr. Marc Christophersen holds a PhD and a MS in material science and engineering from the University of Kiel, Germany. Since 2007 he is a NRC (National Research Council) postdoctoral fellow at the Naval Research Laboratory, Space Science Division, under the supervision of Dr. B. F. Phlips working on gamma-ray detector designs. Prior to his NRC, he has been a postdoctoral fellow at the University of Maryland and University Rochester working in photonics, MEMS and bioMEMS applications.
Poster Link: Poster