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Report of Contributions 18th International Workshop on Low Temperature Detectors (LTD-18) Report of Contributions https://agenda.infn.it/e/LTD18 18th Internationa … / Report of Contributions Diamond Detectors for Direct Det … Contribution ID: 21 Type: Poster Diamond Detectors for Direct Detection of Sub-GeV Dark Matter Tuesday, 23 July 2019 18:45 (15 minutes) We propose to use high-purity lab-grown diamond for the detection of sub-GeV dark matter. Di- amond targets can be sensitive to both nuclear and electron recoils from dark matter scattering in the MeV and above mass range, as well as to absorption processes of dark matter with masses between sub-eV to 10’s of eV. Compared to other proposed semiconducting targets such as germanium and silicon, diamond de- tectors can probe lower dark matter masses via nuclear recoils due to the lightness of the carbon nucleus. The expected reach for electron recoils is comparable to that of germanium andsili- con, with the advantage that dark counts are expected to be under better control. Via absorption processes, unconstrained QCD axion parameter space can be successfully probed in diamond for masses of order 10 eV, further demonstrating the power of our approach. Less than 5 years of experience since completion of Ph.D Y Student (Ph.D., M.Sc. or B.Sc.) Y Primary authors: YU, To Chin (SLAC National Accelerator Laboratory); Dr KURINSKY, Noah (Fermi National Accelerator Laboratory); Prof. HOCHBERG, Yonit (Hebrew University of Jerusalem); Prof. CABRERA, Blas (Stanford University) Presenter: YU, To Chin (SLAC National Accelerator Laboratory) Session Classification: Poster session Track Classification: Low Temperature Detector Applications October 7, 2021 Page 1 18th Internationa … / Report of Contributions Current State of Thermal Kinetic I … Contribution ID: 22 Type: Oral Presentation Current State of Thermal Kinetic Inductance Detectors for Ground-Based Millimeter Wave Cosmology Friday, 26 July 2019 14:45 (15 minutes) Thermal Kinetic Inductance Detectors (TKIDs) are a promising path towards combining theexcel- lent noise performance of traditional bolometers with an RF multiplexing architecture that enables the large detector counts needed for the next generation of millimeter wave instruments. In this work, we present dark prototype TKID pixels that achieve background limited noise performance in the 150 GHz band and at higher frequencies. We demonstrate that with a common-mode noise rejection strategy, we achieve good noise stability down to 0.1 Hz. We discuss the optimizations in the device design and fabrication techniques that were necessary to achieve good electrical performance and high-quality factors at our operating temperature. These improvements directly translate to a low readout noise penalty for improved multiplexing capabilities. Less than 5 years of experience since completion of Ph.D Y Student (Ph.D., M.Sc. or B.Sc.) Y Primary author: Mr WANDUI, Albert (Caltech) Co-authors: Mr STEINBACH, Bryan (Caltech); Mr O’BRIENT, Roger (JPL); Mr MINUTOLO, Lorenzo (JPL); Mr BOCK, Jamie (Caltech); Mr TURNER, Anthony (JPL) Presenter: Mr WANDUI, Albert (Caltech) Session Classification: Orals LM 002 Track Classification: Low Temperature Detector fabrication techniques and materials October 7, 2021 Page 2 18th Internationa … / Report of Contributions Fabrication of phononic-isolated k … Contribution ID: 23 Type: Poster Fabrication of phononic-isolated kinetic inductance detectors Thursday, 25 July 2019 18:45 (15 minutes) Kinetic inductance detectors (KID) have received increased interest due to their low noise, and scalability to large format arrays required by next generation of astronomical telescopes. The de- velopment of KIDs has progressed rapidly, with very low noise equivalent power demonstrated by several groups and KIDs arrays implemented in several ground-based and air-borne instruments. In this paper, we describe a new fabrication process which consists of a membrane isolated KID incorporating a phononic bandgap structure tuned to block recombination phonons from escaping to the thermal bath. This architecture is designed to increase the quasi-particle lifetime and results in increased responsivity to signal photons and lower noise. These devices have been fabricated as lumped-element resonators with hafnium inductors and niobium capacitors on low stress sili- con nitride and silicon-on-insulator membranes. We discuss the fabrication process, which uses a combination of sub-micron laser based direct write lithography and nanoscale electron beam lithography. Less than 5 years of experience since completion of Ph.D N Student (Ph.D., M.Sc. or B.Sc.) N Primary authors: Mr DENIS, Kevin (NASA GSFC); Dr DE VISSER, Peiter (SRON); Dr MAASILTA, Ilari (University of Jyvaskyla); Dr PUURTINEN, Tuomas (University of Jyvaskyla); Dr ROSTEM, Kar- wan (University of Maryland Baltimore); Dr WILLIAMS, Elissa H. (NASA GSFC); Dr WOLLACK, Ed- ward J. (NASA GSFC) Presenter: Mr DENIS, Kevin (NASA GSFC) Session Classification: Poster session Track Classification: Low Temperature Detector fabrication techniques and materials October 7, 2021 Page 3 18th Internationa … / Report of Contributions Charged fluctuators as a limit to th… Contribution ID: 24 Type: Invited Presentation Charged fluctuators as a limit to the microscopic and macroscopic coherence of superconductors Friday, 26 July 2019 12:15 (15 minutes) By analyzing experiments on thin-film resonators of NbSi and TiN, we elucidate a decoherence mechanism at work in disordered superconductors. This decoherence is caused by charged Two Level Systems (TLS) which couple to the conduction electrons in the BCS ground state, induc- ing fluctuations of the kinetic inductance. Standard theories of mesoscopic disordered conductors are used to describe this effect, linking electronic (microscopic) decoherence and electromagnetic (macroscopic) decoherence in superconductors. Given the omnipresence of charged TLS in solid- state systems, this decoherence mechanism affects all experiments involving disordered supercon- ductors, and more strongly so devices with smaller cross-sections. In particular, we show it easily explains the poor coherence observed in quantum phase slip experiments and may contribute to lowering the quality factors in disordered superconductor resonators. (arXiv:1810.12801) Less than 5 years of experience since completion of Ph.D N Student (Ph.D., M.Sc. or B.Sc.) N Primary authors: Dr LE SUEUR, Hélène (CNRS); Dr SVILANS, Artis (CEA); Mr BOURLET, Nicolas (CEA); Dr MURANI, Anil (CEA); Mr BERGE, Laurent (CSNSM, CNRS); Dr DUMOULIN, Louis (CSNSM, CNRS); Dr JOYEZ, Philippe (CEA, Saclay) Presenter: Dr LE SUEUR, Hélène (CNRS) Session Classification: Orals LM 003 Track Classification: Low Temperature Detector fabrication techniques and materials October 7, 2021 Page 4 18th Internationa … / Report of Contributions Antenna-Coupled TES Arrays Dev … Contribution ID: 25 Type: Poster Antenna-Coupled TES Arrays Development for BICEP Array CMB Experiment Thursday, 25 July 2019 18:45 (15 minutes) We have developed Antenna-coupled transition-edge sensor (TES) arrays for high-sensitivity cos- mic microwave background (CMB) observations over a wide range of millimeter-wave bands. BI- CEP Array is the latest instrument in the BICEP/Keck experiment series, which is designed to search for inflationary B-Modes as low as the tensor-to-scalar ratio r=0.01 in the presence ofgalac- tic foregrounds. We will deploy BICEP Array to the South Pole starting at the end of 2019, with detectors spanning 30 to 270 GHz. In this talk, I will describe how we have optimized the low frequency 30/40 GHz detector antennas and packaging for optical efficiency and beam matching between polarization pairs. I will also describe how the uniformly illuminated antennas arrays pro- vides a higher packing density than non-uniform alternatives and will share dual-color detector designs that could further increase detector density. I will finally report our latest measurements for the newly broad-band corrugation design to minimize the beam differential ellipticity between polarization pairs caused by the metal frame of the housing over 30/40 GHz. Less than 5 years of experience since completion of Ph.D N Student (Ph.D., M.Sc. or B.Sc.) Y Primary authors: Mr MOHAMED , Ahmed Mohamed Soliman (California Institute of Technol- ogy); Dr STEINBACH, Bryan (California Institute of Technology); Dr O’BREINT , Roger (NASA Jet Propulsion Laboratory); Prof. VANZYL, Jakob (California Institute of Technology); Prof. BOCK, James (California Institute of Technology) Presenter: Mr MOHAMED , Ahmed Mohamed Soliman (California Institute of Technology) Session Classification: Poster session Track Classification: Low Temperature Detector Applications October 7, 2021 Page 5 18th Internationa … / Report of Contributions Design and performance of the BI … Contribution ID: 26 Type: Oral Presentation Design and performance of the BICEP Array receivers Tuesday, 23 July 2019 11:45 (15 minutes) The inflationary scenario generically predicts the existence of primordial gravitational waves, though over a wide range of amplitudes from slow-roll to multi-field models. The presence of these tensor perturbations at the last scattering surface imprinted the cosmic microwave background (CMB) po- larization with a unique parity-odd “B-mode” pattern at 1-degree angular scale. The BICEP/Keck (BK) Collaboration targets this primordial signature, which is parametrized by the tensor-to-scalar ratio “r”, by observing the polarized microwave sky from the exceptionally
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