Speaker
David Radford
(ORNL)
Description
A novel, large volume, HPGe detector concept capable of providing high efficiency, excellent energy resolution, and extremely fine position sensitivity will be described. The device, referred to as an "Inverted Coaxial" HPGe detector, is based on a non-standard closed-end coaxial geometry and employs point contact technology [1,2]. Experimental characterization measurements have been made using a non-segmented prototype, while detailed electric field and signal generation calculations have been employed in designing a larger, electrically segmented version of the device. The non-segmented prototype has an energy resolution of 1.8 keV FWHM at 1.3 MeV with excellent performance at low energies. A segmentation scheme has been designed for an 80-mm long x 70-mm diameter tapered-cylindrical prototype. This segmentation pattern minimizes the number of readout channels required while providing typical calculated position resolution FWHM values of less than 0.2 mm in three dimensions. Characterization of the non-segmented prototype is ongoing while plans are in place to order a segmented device in the coming months.
[1] P.N. Luke et al., Trans. Nucl. Sci. 36 1 (1989) 926 - 930.
[2] P.S. Barbeau and J.I. Collar, J. Cosmol. Astropart. Phys. 09 (2007) 009.
Primary author
David Radford
(ORNL)
Co-authors
Karin Lagergren
(ORNL)
Reynold Cooper
(ORNL)
