Göttingen 2012 – scientific programme
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T: Fachverband Teilchenphysik
T 112: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 7
T 112.4: Talk
Thursday, March 1, 2012, 17:35–17:50, ZHG 102
Electrostatic field calculations for a dual phase noble gas WIMP detector — •Daniel Hilk, Guido Drexlin, Ferenc Glück, and Thomas Thümmler — KIT Center Elementary Particle and Astroparticle Physics (KCETA)
In the last years, dual phase noble gas detectors like XENON100 or WARP delivered today’s most accurate limits on WIMP-nucleon cross-sections up to σ≃10−45cm2.
To push the sensitivity to the region of theoretical predicted limits of O(10−47cm2), several European groups are working within a consortium on the technical design report for DARWIN (DARk matter WImp search with Noble liquids), a facility housing two multi-ton detectors combining both technologies from the Argon- and Xenon-based experiments.
In case of a WIMP colliding with an Ar or Xe nucleus, photons and electrons will be emitted within the liquid detector material. Whereas photosensors detect the light signal, the electrons drift within a homogeneous electric field, generated by field forming meshes, to the top of the detector to be registered via electroluminescence. This principle allows an excellent background discrimination.
In order to map the interaction point correctly, it is indispensable to simulate the exact electric field configuration. Therefore, the simulation program Kassiopeia, originally developed for the KATRIN experiment, has been applied. Kassiopeia uses BEM, which is advantageous especially for simulating small scale wire structures within large volumina.
The talk summarizes current results and discusses several calculation methods.