Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique

TT 32.25: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Position Resolved High Resolution Particle Detection Using Magnetic Calorimeters — •Christian Pies, Christian Domesle, Sebastian Kempf, Andreas Fleischmann, Loredana Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120 Heidelberg

Low temperature micro-calorimeters are attractive x-ray and particle detectors for a large variety experiments due to their high resolving power and their energy dispersive character. With single pixel metallic magnetic calorimeters (MMC) an energy resolution of 2.7 eV for 6 keV x-rays was recently achieved. Quite some applications of MMCs would benefit greatly from the development of detector arrays, as they are position sensitive and allow for imaging, larger detection areas as well as the suppression of doppler-broadening in atomic spectroscopy at ion storage rings.

We recently developed two types of position sensitive MMC arrays. The first consists of 8 x-ray sensors, optimized for the energy range up to 100 keV, which are pairwise read-out by 4 dc-SQUIDs. The second prototype consists of a line of 8 large area absorbers for accelerated molecules, which are read-out by two dc-SQUIDs. To allow for this, two sets of paramagnetic sensors and pick-up coils are connected to the absorbers, one with increasing, one with decreasing sensitivity along the line of absorbers. In this case, the sum of the two signal channels represents the deposited energy and the normalized difference the position. We present data for both detectors and discuss general design considerations as well as the achievable energy resolution.