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Towards the In-situ Detection of Individual He2* Excimers Using a Ti TES in
Superfluid Helium
Faustin W. Carter, Scott A. Hertel, Michael J. Rooks,
Daniel N. McKinsey, and Daniel E. Prober
Daniel N. McKinsey, and Daniel E. Prober
Yale University, New Haven, CT 06511 USA
E-mail: [email protected]
Abstract — We characterize a single titanium (Ti) transition edge sensor (TES) designed for in-situ detection of individual He2* excimers. We find a critical temperature of 420 mK, an electrothermal time constant of~3 µs, and a total energy resolution of 1.5 eV. We observe the detector response to short laser pulses, and present a successful analysis strategy for extracting direct-TES-hit pulse areas from a much larger substrate hit background. We discuss near-term plans for coupling multiple such TESs together with a shared aluminum (Al) absorber, increasing the He2* collection area to millimeter scales. Finally, we briefly discuss the technical challenges (and solutions) of installing a hermetic superfluid volume in a cryogen-free dilution refrigerator.
Keywords (Index Terms) — Transition Edge Sensor, Helium excimer, UV Sensor
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), October 2014.
Received August 14, 2014; Selected September 20, 2014. Reference ST404; Category 4.
ASC 2014 manuscript 2EPo2F-02 published online in IEEE Trans. Appl. Supercond.(IEEE
XPLORE) DOI:10.1109/TASC.2014.2372673, on November 20, 2014.
XPLORE) DOI:10.1109/TASC.2014.2372673, on November 20, 2014.