Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Poster Session: Matter at Low Temperature

TT 11.1: Poster

Monday, March 14, 2011, 14:00–18:00, P4

Development of a large-area detector for position and energy resolving detection of molecular fragments — •Alexandra Kampkötter, Andreas Fleischmann, Loredana Gastaldo, Sebastian Heuser, Sebastian Kempf, Christian Pies, Jan-Patrick Porst, Philipp Ranitzsch, Sönke Schäfer, Sarah Vick, Thomas Wolf, and Christian Enss — Kirchhoff Institute for Physics, Heidelberg University

The recombination of a molecular cation with a low-energy electron, followed by fragmentation, is a fundamental reaction process in cold and dilute plasmas. For polyatomic ions, it can yield molecular fragments in excited states. The construction of a cryogenic (∼ 2 K) storage ring to store molecular ions in their groundstate is in progress to be built at the Max-Planck Institute for Nuclear Physics in Heidelberg. For measurements in the ring the usage of a metallic magnetic calorimeter (MMC) is planned. A MMC consists of a particle absorber and a paramagnetic temperature sensor, placed in a weak magnetic field. According to the calorimetric detection principle, the deposition of energy in the absorber causes a rise in temperature of the detector. The resulting magnetization change of the sensor can be read out as a change in magnetic flux by a low-noise dc-SQUID-magnetometer. Additionally to an energy-resolution the detector for the application in the CSR shall give information about the position of a detected particle. Due to the diffusive expansion of heat in a large-area absorber, the impact location can be associated to the rise-time of the detector-signal for particles with energy of a few keV upwards.