Low Energy Backgrounds and Excess Noise in a Two-Channel Low-Threshold Calorimeter
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| Format: | Preprint |
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2024
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| author | Anthony-Petersen, Robin Chang, Clarence L. Chang, Yen-Yung Chaplinsky, Luke Fink, Caleb W. Garcia-Sciveres, Maurice Guo, Wei Hertel, Scott A. Li, Xinran Lin, Junsong Lisovenko, Marharyta Mahapatra, Rupak Matava, William McKinsey, Daniel N. Osterman, David Z. Patel, Pratyush K. Penning, Bjoern Platt, Mark Pyle, Matt Qi, Yinghe Reed, Maggie Rydstrom, Ivar Romani, Roger K. Sadoulet, Bernard Serfass, Bruno Sorensen, Peter Suerfu, Burkhant Velan, Vetri Wang, Gensheng Wang, Yue Watkins, Samuel L. Williams, Michael R. |
| author_facet | Anthony-Petersen, Robin Chang, Clarence L. Chang, Yen-Yung Chaplinsky, Luke Fink, Caleb W. Garcia-Sciveres, Maurice Guo, Wei Hertel, Scott A. Li, Xinran Lin, Junsong Lisovenko, Marharyta Mahapatra, Rupak Matava, William McKinsey, Daniel N. Osterman, David Z. Patel, Pratyush K. Penning, Bjoern Platt, Mark Pyle, Matt Qi, Yinghe Reed, Maggie Rydstrom, Ivar Romani, Roger K. Sadoulet, Bernard Serfass, Bruno Sorensen, Peter Suerfu, Burkhant Velan, Vetri Wang, Gensheng Wang, Yue Watkins, Samuel L. Williams, Michael R. |
| contents | We describe observations of low energy excess (LEE) events, background events observed in all light dark matter direct detection calorimeters, and noise in a Transition Edge Sensor based two-channel silicon athermal phonon detector with 375 meV baseline energy resolution. We measure two distinct LEE populations: ``shared'' multichannel events with a pulse shape consistent with substrate athermal phonon events, and sub-eV events that couple nearly exclusively to a single channel with a significantly faster pulse shape. These ``singles'' are consistent with events occurring within the aluminum athermal phonon collection fins. Similarly, our measured detector noise is higher than the theoretical expectation. Measured noise can be split into an uncorrelated component, consistent with shot noise from small energy depositions within the athermal phonon sensor itself, and a correlated component, consistent with shot noise from energy depositions within the silicon substrate's phonon system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_16510 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Low Energy Backgrounds and Excess Noise in a Two-Channel Low-Threshold Calorimeter Anthony-Petersen, Robin Chang, Clarence L. Chang, Yen-Yung Chaplinsky, Luke Fink, Caleb W. Garcia-Sciveres, Maurice Guo, Wei Hertel, Scott A. Li, Xinran Lin, Junsong Lisovenko, Marharyta Mahapatra, Rupak Matava, William McKinsey, Daniel N. Osterman, David Z. Patel, Pratyush K. Penning, Bjoern Platt, Mark Pyle, Matt Qi, Yinghe Reed, Maggie Rydstrom, Ivar Romani, Roger K. Sadoulet, Bernard Serfass, Bruno Sorensen, Peter Suerfu, Burkhant Velan, Vetri Wang, Gensheng Wang, Yue Watkins, Samuel L. Williams, Michael R. Instrumentation and Detectors We describe observations of low energy excess (LEE) events, background events observed in all light dark matter direct detection calorimeters, and noise in a Transition Edge Sensor based two-channel silicon athermal phonon detector with 375 meV baseline energy resolution. We measure two distinct LEE populations: ``shared'' multichannel events with a pulse shape consistent with substrate athermal phonon events, and sub-eV events that couple nearly exclusively to a single channel with a significantly faster pulse shape. These ``singles'' are consistent with events occurring within the aluminum athermal phonon collection fins. Similarly, our measured detector noise is higher than the theoretical expectation. Measured noise can be split into an uncorrelated component, consistent with shot noise from small energy depositions within the athermal phonon sensor itself, and a correlated component, consistent with shot noise from energy depositions within the silicon substrate's phonon system. |
| title | Low Energy Backgrounds and Excess Noise in a Two-Channel Low-Threshold Calorimeter |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2410.16510 |