Suppression of the optical crosstalk in a multi-channel silicon photomultiplier array

Masuda, Takahiko; Ang, Daniel; Hutzler, Nicholas R.; Meisenhelder, Cole; Sasao, N.; Uetake, Satoshi; Wu, Xing; DeMille, David; Gabrielse, Gerald; Doyle, John M.; Yoshimura, K.

doi:10.1364/oe.424460

Cited by 19 publications

(15 citation statements)

References 27 publications

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“…This improvement consists of two parts: a factor of 3.5 from the rotational cooling plus lens system if it was optimized for the shorter beamline in ACME II; and a factor of 1.3 from additional beam collimation by the lens in the expanded spin-precession region of ACME III. When combined with other demonstrated upgrades, including the longer coherence time to take advantage of the recently-measured H state lifetime [8], detectors with higher efficiency [35], and a reduction of technical noise [36], we project an improved statistical sensitivity to the electron EDM by potentially 30 times compared to the current best limit [3] from ACME II.…”

Section: Discussionmentioning

confidence: 99%

Electrostatic focusing of cold and heavy molecules for the ACME electron EDM search

Han

et al. 2022

New J. Phys.

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The current best upper limit for electron electric dipole moment (EDM), |de|<1.1×10-29 e·cm (90% confidence), was set by the ACME collaboration in 2018. The ACME experiment uses a spin-precession measurement in a cold beam of ThO molecules to detect de. An improvement in statistical uncertainty would be possible with more efficient use of molecules from the cryogenic buffer gas beam source. Here, we demonstrate electrostatic focusing of the ThO beam with a hexapole lens. This results in a factor of 16 enhancement in the molecular flux detectable downstream, in a beamline similar to that built for the next generation of ACME. We also demonstrate an upgraded rotational cooling scheme that increases the ground state population by 3.5 times compared to no cooling, consistent with expectations and a factor of 1.4 larger than previously in ACME. When combined with other demonstrated improvements, we project over an order of magnitude improvement in statistical sensitivity for the next generation ACME electron EDM search.

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Section: Discussionmentioning

confidence: 99%

Electrostatic focusing of cold and heavy molecules for the ACME electron EDM search

Han

et al. 2022

New J. Phys.

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“…The ACME experiment [196] uses a cryogenic molecular beam of ThO in a metastable electronic state, and currently sets the most sensitive eEDM limit of |d e | < 1.1 × 10 −29 e cm. ACME is currently developing a third-generation experiment that will improve coherence time with a longer beam line, increase count rates through enhancements to molecular flux and detection efficiency, and suppress systematic errors through better control of experimental imperfections [280][281][282]. The JILA HfF + experiment uses trapped molecular ions, which enables considerably longer coherence time than can be achieved by beam experiments.…”

Section: Molecular Searchesmentioning

confidence: 99%

Electric dipole moments and the search for new physics

Alarcón¹,

Alexander²,

Anastassopoulos³

et al. 2022

Preprint

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Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well beyond those reached directly at high energy colliders. Discrimination between different physics models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss the current status and prospects in the near future for a compelling suite of such experiments, along with developments needed in the encompassing theoretical framework.

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“…• Optical crosstalk: Given the large size of the light signal, there is a chance that this might cause optical crosstalk among the various pixels of the SiPM and enhance the size of our signal. [26] The end goal of the backing detector is to tag keV scale neutrons efficiently; we are not concerned with the amount of energy that is deposited by each n-capture event. Thus correct simulation of light propagation is of greater relative importance.…”

Section: Light Collectionmentioning

confidence: 99%

A backing detector for order-keV neutrons

Biekert,

Chaplinsky,

Fink

et al. 2022

Preprint

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We have designed and tested a large-area (0.15 m 2 ) neutron detector based on neutron capture on 6 Li. The neutron detector design has been optimized for the purpose of tagging the scattering angle of keV-scale neutrons. These neutron detectors would be employed to calibrate the low-energy (<100 eV) nuclear recoil in detectors for dark matter and coherent elastic neutrino nucleus scattering (CEνNS). We describe the design, construction, and characterization of a prototype. The prototype is designed to have a tagging efficiency of ∼25% at the relevant O(keV) neutron energies, and with a mean capture time of ∼17 µs. The prototype was characterized using a 252 Cf neutron source and agreement with the simulation was observed within a few percent level.

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Suppression of the optical crosstalk in a multi-channel silicon photomultiplier array

Cited by 19 publications

References 27 publications

Electrostatic focusing of cold and heavy molecules for the ACME electron EDM search

Electrostatic focusing of cold and heavy molecules for the ACME electron EDM search

Electric dipole moments and the search for new physics

A backing detector for order-keV neutrons

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