A First Application of Machine and Deep Learning for Background Rejection in the ALPS II TES Detector

Meyer, M.; Katharina, Isleif,; Januschek, F.; Lindner, Axel; Othman, G.; Rubiera, Gimeno, Jose Alejandro; Christina, Schwemmbauer,; Schott, M.; Shah, Rikhav

doi:10.1002/andp.202200545

Cited by 2 publications

(3 citation statements)

References 41 publications

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“…Direct dark matter searches using ALPS II's TES detection system Christina Schwemmbauer Notably, our setup has already achieved very low intrinsic dark count rates (in an analysis optimized for 1.165 eV) as low as (2.16 ± 2.02) • 10 −6 Hz [16]. These dark counts include mainly electronic noise but also radioactivity or cosmic backgrounds.…”

Section: Pos(eps-hep2023)120mentioning

confidence: 96%

“…An optical fiber will connect the ALPS II experiment directly to the TES detector inside a cryostat. In the interest of this measurement, the so-called intrinsic background was studied extensively, which are the dark counts of the sensor without the attached optical fiber [9,15,16]. Based on these studies, one can predict the performance of our TES detector for DM-scattering experiments (also with disconnected fiber) using the dielectric function of the target [17].…”

Section: Pos(eps-hep2023)120mentioning

confidence: 99%

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Direct dark matter searches using ALPS II's TES detection system

Schwemmbauer,

Hochberg,

Isleif

et al. 2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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The elusive Dark Matter (DM), proposed due to its gravitational interaction with ordinary matter, supposedly makes up ∼ 25 % of our universe's energy content. Various models aim to explain the origin and properties of DM, many of these proposing beyond standard model particles. It is foreseen that the ALPS II (Any Light Particle Search II) light-shining-through-walls experiment will use NIST Transition Edge Sensors (TESs) to detect low-energy single-photons originating from axion(ALP)-photon conversion with rates as low as 10 −5 s −1 . Even beyond ALPS II, these superconducting microcalorimeters, operated at cryogenic temperatures, offer an approach to search for another class of particle-DM candidate. Much of the work to ensure the viability of the TES detector for use in ALPS II, such as calibrating the detector and mitigating external sources of backgrounds, also leads to the ability to utilize the TES for an independent direct-DM search. For this purpose, the superconducting sensor, sensitive to sub-eV energy depositions, can be used as a simultaneous target and sensor for DM-electron scattering for sub-MeV DM.

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Section: Pos(eps-hep2023)120mentioning

confidence: 96%

Section: Pos(eps-hep2023)120mentioning

confidence: 99%

Direct dark matter searches using ALPS II's TES detection system

Schwemmbauer,

Hochberg,

Isleif

et al. 2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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“…Cuts imposed on the fitting parameters in an intrinsic sample allowed the rejection of almost all background events, reaching a rate of 6.9 +2.6 -1.5 • 10 -6 cps [10] while keeping more than 90 % efficiency for 1064 nm photons, reflecting that the intrinsics sample contains pulses with an amplitude and shape different than the one for photons. These results have been further improved using machine learning techniques [15].…”

Section: Pulse Shape Analysis In Frequency Domainmentioning

confidence: 99%

A TES system for ALPS II - Status and Prospects

Rubiera Gimeno,

Januschek,

Isleif

et al. 2023

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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The Any Light Particle Search II (ALPS II) is a Light-Shining-through-a-Wall experiment operating at DESY, Hamburg. Its goal is to probe the existence of axions and axion-like particles (ALPs), possible candidates for dark matter. In the ALPS II region of interest, a rate of photons reconverting from axions/ALPs on the order of 10 -5 cps is predicted by some astrophysical hints. A first science run at lower sensitivity based on a heterodyne detection method was successfully started in May 2023. The design sensitivity is expected to be reached in 2024. A complementary science run is foreseen with a single photon detection scheme. This requires a sensor capable of measuring low-energy photons (1.165 eV) with high efficiency and a low dark count rate. We investigate a tungsten Transition Edge Sensor (TES) system as a photon-counting detector that promises to meet these requirements. This detector exploits the drastic change in resistance caused by the absorption of a single photon when operated in its superconducting transition region at millikelvin temperatures. To achieve the required sensitivity, implementing the TES into the ALPS II experiment needs to be carefully optimized. In this work, we present the progress on measurements for the characterization of our system and data analysis for background reduction.

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A First Application of Machine and Deep Learning for Background Rejection in the ALPS II TES Detector

Cited by 2 publications

References 41 publications

Direct dark matter searches using ALPS II's TES detection system

Direct dark matter searches using ALPS II's TES detection system

A TES system for ALPS II - Status and Prospects

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