Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Suche nach dunkler Materie III

T 62.7: Talk

Tuesday, March 1, 2016, 18:20–18:35, VMP9 SR 28

The CRESST-III iStick Veto: Stable operation of multiple transition edge sensors in one readout circuit — •Johannes Rothe for the CRESST collaboration — Max-Planck-Institut f. Physik (Werner-Heisenberg-Institut) — Ludwig-Maximilians-Universität München

To enable complete rejection of holder-related events in the upcoming CRESST-III dark matter search experiment, the scintillating target crystals are held by calcium tungstate sticks (iSticks) instrumented with tungsten transition edge sensors (TESs). Since the iStick signals are used exclusively for vetoing, it is sufficient to register if an event happened in any stick, without knowing which one. This allows the operation of all iSticks in a single readout circuit, requiring just one SQUID magnetometer. The talk will describe the effect of bias current heating and corresponding hysteresis phenomena known in single-TES circuits, and the resulting conditions for stability in multiple-TES circuits. The fundamentally different behaviour of parallel and series circuits and resulting design choices will be explored.