Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.3: Poster

Montag, 11. März 2013, 15:00–19:00, Poster D

Development of a large-area detector for position and energy resolving detection of molecular fragments — •L. Gamer, A. Fleischmann, L. Gastaldo, A. Kampkötter, S. Kempf, C. Pies, P. Ranitzsch, S. Schäfer, T. Wolf, and C. Enss — Kirchhoff Institute for Physics, Heidelberg University.

To investigate reactions like the dissociative recombination in laboratory environment, the Max-Planck Institute for Nuclear Physics in Heidelberg is presently building a cryogenic storage ring to prepare molecular ions in their rotational groundstate. The full kinematics of these processes can be resolved by a position and energy sensitive detection of the reaction products/molecule fragments.

We describe the development of a large-area MMC for position sensitive detection of massive particles with kinetic energies of a few keV. The detector encompasses sixteen slice-shaped large-area absorbers to form a circular whole with a diameter of 36 mm. The temperature sensor is positioned on the outer edge of each absorber. Due to the finite thermal diffusivity in the absorber material, the rise-time of the detector-signal depends on the impact location of the particle.

We compare a numerical analysis for the energy and position dependence of the detector signal to results of recent test measurements where energy was deposited at different positions by LED light pulses as well as x-ray photons delivered by an ⁵⁵Fe source. For massive particles, potential degradation of instrumental line width as well as energy losses by backscattering, sputtering and lattice damages are discussed using Monte Carlo simulations.