We fabricated compact low-pass stainless-steel powder filters for use in low-noise measurements at cryogenic temperatures and investigated their attenuation characteristics for different wire lengths, shapes, and preparation methods up to 20 GHz. We used nominally 30-micrometer-sized SUS 304L powder and mixed with Stycast 2850FT by Emerson and Cumming with catalyst 23LV. A 0.1 mm insulated copper wire was wound on preformed powder-mixture spools in the shape of a right-circular cylinder, a flattened elliptic cylinder and a toroid, and the coils were encapsulated in metal tubes or boxes filled with the powder mixture. All the fabricated powder filters showed a large attenuation at high frequencies with a cut-off frequency near 1 GHz. However, the toroidal filter showed prominent ripples corresponding to resonance modes in the 0.5-m-long coil wire. A filter with a 2:1 powder/epoxy mixture mass rate and a wire length of 1.53 m showed an attenuation of -93 dB at 4 GHz and the attenuation was linearly proportional to the wire length. As the powder-to-epoxy ratio increased, the high-frequency attenuation increased. An equally-spaced single-layer coil structure was found to be more efficient in attenuation than a double-layer coil. Geometry of the metal filter-case affected noise ripples with the least noise in a circular-tube case.
3D-Structured Polyethylene Windows for Low-Loss Transmission in Wideband Cryogenic Terahertz Systems
Chalmers University of Technology（查尔姆斯理工大学）；Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, Grenoble INP, CROMA（格勒诺布尔阿尔卑斯大学、萨瓦-蒙布朗大学、法国国家科学研究中心、格勒诺布尔理工学院、CROMA）
The relative interfacial thermal contraction as a possible origin of the low-energy excess in cryogenic calorimeters
Max Planck Institute for Physics（马克斯·普朗克物理研究所）；Marietta Blau Institute for Particle Physics of the Austrian Academy of Sciences（奥地利科学院玛丽埃塔·布劳粒子物理研究所）；Humboldt-Universität zu Berlin（柏林洪堡大学）
NTL-amplified cryogenic light detectors with optically transparent electrodes
INFN, Sezione di Milano Bicocca（意大利国家核物理研究所米兰比可卡分部）；Dipartimento di Fisica ”G.Occhialini”, Università degli Studi di Milano - Bicocca（米兰比可卡大学G.奥恰利尼物理系）；INFN, Sezione di Pavia（意大利国家核物理研究所帕维亚分部）
CCAT: Detector Noise Limited Performance of the RFSoC-based Readout Electronics for mm/sub-mm/far-IR KIDs
University of British Columbia（不列颠哥伦比亚大学）；University of Victoria（维多利亚大学）；Herzberg Astronomy and Astrophysics Research Centre, National Research Council Canada（加拿大国家研究委员会赫茨伯格天文学与天体物理学研究中心）；Cornell University（康奈尔大学）；National Institute of Standards and Technology（美国国家标准与技术研究院）；University of California, Riverside（加州大学河滨分校）；Arizona State University（亚利桑那州立大学）
