Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Ion Storage Rings
MS 7.3: Vortrag
Mittwoch, 25. März 2015, 11:30–11:45, PH/HS2
Large-area detectors for position and energy resolving detection of neutral molecular fragments at CSR — •L. Gamer1, D. Schulz1, A. Fleischmann1, L. Gastaldo1, S. Kempf1, C. Krantz2, O. Novotny3, A. Wolf2, and C. Enss1 — 1Heidelberg Univ. — 2MPI-K Heidelberg — 3Columbia Astrophysics Laboratory
We present a detector with a circular detection area of 10 cm2 based on metallic magnetic calorimeters that is suited for position and energy sensitive measurements of neutral particle hits from fragmentation of molecular ion beams at the Cryogenic Storage Ring at MPI-K. It consists of 16 large area particle absorbers, arranged like the 16 slices of a pizza of radius 36 mm, where the temperature of each is monitored by a paramagnetic temperature sensor positioned along the outer absorber edges. Due to the finite thermal diffusivity in the absorbers, the signal rise-time is a measure of the radial event position while the integrated signal amplitude is proportional to the particle energy. We show very successful prove-of-principle experiments of this detector using x-ray photons. We discuss measurements where fragments of 150 keV molecules where stopped in massive gold absorbers showing that the production of lattice defects can cause a major contribution to linewidth in this energy and mass range. As an outlook we move on to a 4096 pixels detector covering a detection area of 20 cm2. It consists of 1024 temperature sensors that are read out by only 32 SQUID channels. Each temperature sensor is coupled to 4 absorbers using different thermal links, thus allowing to locate the event position within a set of absorbers again by measuring the rise-time of the detector signal.