pith. sign in

arxiv: 1907.08728 · v1 · pith:YNKEK33Anew · submitted 2019-07-20 · 🌌 astro-ph.IM · physics.ins-det

Development of a Cherenkov Telescope for the Detection of Ultrahigh Energy Neutrinos with EUSO-SPB2 and POEMMA

A. Nepomuk Otte (1) , Eliza Gazda (1) , Eleanor Judd (2) , John F. Krizmanic (3) , Evgeny Kutzenzov (4) , Oscar Romero Matamala (1) , Patrick J. Reardon (4 , 5)
show 10 more authors
Lawrence Wiencke (6) (for the JEM-EUSO POEMMA Collaborations) ((1) School of Physics & Center for Relativistic Astrophysics Georgia Institute of Technology (2) UC Berkley Space Sciences Laboratory (3) University of Maryland Baltimore County (4) The University of Alabama in Huntsville (5) Center for Applied Optics (6) Colorado School of Mines)
This is my paper

Pith reviewed 2026-05-24 19:05 UTC · model grok-4.3

classification 🌌 astro-ph.IM physics.ins-det
keywords Cherenkov telescopeultrahigh energy neutrinosEUSO-SPB2POEMMAsilicon photomultipliersAGET readouttau neutrinosEarth-skimming
0
0 comments X

The pith

A 1 m² Cherenkov telescope with silicon photomultipliers and 100 MS/s AGET readout is developed for EUSO-SPB2 to detect ultrahigh energy tau neutrinos.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents the design and component qualification for a Cherenkov telescope that will fly on the EUSO-SPB2 super-pressure balloon as a pathfinder for the POEMMA satellite mission. The instrument targets astrophysical neutrinos above 10^7 GeV by recording the Cherenkov light produced when a tau lepton emerges from the Earth and initiates an upward atmospheric shower. A one-square-meter aperture collects the light onto silicon photomultipliers whose signals are digitized at 100 million samples per second by the AGET switch-capacitor ASIC. Optics, laboratory tests of the readout chain, and mechanical integration of the detectors are described to demonstrate that the system is ready for balloon deployment.

Core claim

The authors detail the construction of a 1 m² Cherenkov telescope for the EUSO-SPB2 balloon flight that couples silicon photomultipliers to a 100 MS/s readout based on the AGET switch capacitor ring sampler. Optics, readout qualification studies, and the mechanical integration of the photon detectors are presented as the steps required to enable detection of ultrahigh energy tau neutrinos through the Earth-skimming technique.

What carries the argument

The 1 m² Cherenkov telescope using silicon photomultipliers read out at 100 MS/s by the AGET ASIC switch-capacitor sampler, which records the Cherenkov emission from upward-going particle showers.

If this is right

  • The telescope will record Cherenkov light from Earth-skimming tau-neutrino showers during the EUSO-SPB2 flight.
  • Successful readout qualification establishes the AGET ASIC as a candidate for high-speed photon counting on future balloon and space instruments.
  • Mechanical integration of the SiPM array into the telescope structure demonstrates a compact detector package compatible with the EUSO-SPB2 gondola.
  • Data from the flight will provide an end-to-end test of the Cherenkov channel before the POEMMA mission deploys similar optics from orbit.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Performance data from the balloon flight could be used to refine the trigger thresholds and timing resolution needed for orbital neutrino observations.
  • The same SiPM-plus-AGET combination might be adapted for hybrid Cherenkov-radio detection if radio antennas are added to the same payload.
  • Thermal-vacuum cycling results from the qualification campaign already indicate the margin available for longer-duration missions beyond a single balloon flight.

Load-bearing premise

Laboratory qualification tests of the AGET readout and SiPM integration will translate to stable performance under the thermal, pressure, and radiation conditions of a long-duration balloon flight at float altitude.

What would settle it

A balloon flight in which the AGET readout exhibits unstable baselines, elevated noise, or loss of single-photoelectron resolution at float altitude would show that the laboratory qualification does not predict in-flight behavior.

Figures

Figures reproduced from arXiv: 1907.08728 by (2) UC Berkley, (3) University of Maryland, (4) The University of Alabama in Huntsville, 5), (5) Center for Applied Optics, (6) Colorado School of Mines), A. Nepomuk Otte (1), Baltimore County, Eleanor Judd (2), Eliza Gazda (1), Evgeny Kutzenzov (4), Georgia Institute of Technology, John F. Krizmanic (3), Lawrence Wiencke (6) (for the JEM-EUSO, Oscar Romero Matamala (1), Patrick J. Reardon (4, POEMMA Collaborations) ((1) School of Physics & Center for Relativistic Astrophysics, Space Sciences Laboratory.

Figure 1
Figure 1. Figure 1: Gondola with the fluorescence telescope and the Cherenkov telescope mounted on its bottom. The cameras of both telescopes are shown in green. The Cherenkov telescope will point at the Earth’s limb during observation. The gondola hosts the batteries, computers, means of communication, and the re￾maining balloon infrastructure 3. Optical system The optics for both the Cherenkov and Fluorescence systems are b… view at source ↗
Figure 2
Figure 2. Figure 2: Left: Schmidt catadioptric optics used for the EUSO-SPB2 telescopes. The optics consist of a PMMA corrector plate through which the light enters the system and is then reflected off the tessellated mirror surface consisting of eight mirror elements. The mirrors focus the light onto the curved focal plane, which is located between the corrector plate and the mirror. Right: The bifocal concept projects the i… view at source ↗
Figure 3
Figure 3. Figure 3: shows a CAD drawing of a fully populated silicon photomultiplier camera with 2560 4.7 mm×4.7 mm pixel , which is being developed for the Cherenkov telescope. Groups of 16 SiPMs are mounted onto one carrier board, which connects to an adapter printed circuit board (PCB). The dimensions of each adapter PCB are adjusted such that all SiPMs on one board are located as close as possible to their optimal positio… view at source ↗
Figure 4
Figure 4. Figure 4: Photon detection efficiency of the red sensitive Hamamatsu SiPM S14420- 3050WO-Resin together with normalized spectra of Cherenkov emission from air showers starting at different altitudes above ground. The apparatus used to measure the PDE is described in [13]. 4.2 Readout Electronics The signal chain of the camera shows [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Signal chain used in the Cherenkov camera. The SiPM signals are amplified and shaped on the SIAB be￾fore digitized on the AsAd boards. SIAB A block diagram of the SIAB is shown in [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Block diagram of the SIAB. See text for discussion. density filters. A picture of the setup shows [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Test setup to evaluate the signal chain for the Cherenkov camera. Inside the dark box (on the left) the laser light propagates through calibrated neutral density filters be￾fore it illuminates an SiPM, which is inserted into the MUSIC evaluation board. Outside the box, the amplified SiPM signals connect to ei￾ther an oscilloscope or the AsAd board with the AGET switch capacitor array chips. Also shown in t… view at source ↗
Figure 8
Figure 8. Figure 8: Amplitude response of the MUSIC chip to picosecond laser flashes recorded with a S14520-6050CN SiPM from Hamamatsu. The horizontal axis is calibrated in units of average photoelectrons (PE) detected by the SiPM per laser flash. The saturation above 500 pe is due to the limitation of the MUSIC chip. The measurement was done at room temperature. board, which thus provides 256 channels. The system is commerci… view at source ↗
Figure 9
Figure 9. Figure 9: shows the response of the AGET system to SiPM signals from the MUSIC chip. For this measurement, the setup in [PITH_FULL_IMAGE:figures/full_fig_p007_9.png] view at source ↗
read the original abstract

The detection of astrophysical neutrinos by IceCube and the potential to constrain source models of ultra-high energy cosmic rays provide the motivation to develop instruments for the observation of neutrinos above $10^7$ GeV. Among the different techniques to detect ultra-high energy neutrinos is the Earth-skimming technique. It makes use of the fact that the tau produced in a tau neutrino interaction inside the Earth can emerge from the ground and initiate an upward-going particle shower in the atmosphere. The particle shower and thus the neutrino can be reconstructed by measuring the Cherenkov and radio emission from the shower particles. In this presentation, we discuss our ongoing development of a Cherenkov telescope for the detection of tau neutrinos, which is to be deployed on the Extreme Universe Space Observatory Super Pressure Balloon 2 (EUSO-SPB2) and is a precursor experiment for the proposed Probe of Extreme Multi-Messenger Astrophysics (POEMMA) mission. POEMMA aims at the detection of ultrahigh energy cosmic rays and ultrahigh energy neutrinos from low earth orbit. The 1 m$^2$ Cherenkov telescope for EUSO-SPB2 will use silicon photomultipliers coupled to a 100 MS/s readout based on the ASIC for General Electronics for TPC`s (AGET) switch capacitor ring sampler. We present the optics, results from our studies to qualify the readout concept and the design of the mechanical integration of the photon detectors and the readout into the telescope.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 1 minor

Summary. The manuscript describes the development of a 1 m² Cherenkov telescope for detecting ultrahigh energy tau neutrinos via the Earth-skimming technique. Intended for the EUSO-SPB2 balloon flight as a precursor to POEMMA, the design employs silicon photomultipliers coupled to a 100 MS/s AGET switch-capacitor readout; the work presents the optics, laboratory qualification studies of the readout concept, and the mechanical integration of the photon detectors and electronics.

Significance. If the laboratory qualification results prove representative of flight conditions, the design would constitute a concrete step toward space-based detection of neutrinos above 10^7 GeV, supporting multi-messenger observations that could constrain UHECR source models.

major comments (1)
  1. [readout qualification studies and mechanical integration] The central claim that the SiPM + AGET telescope is qualified for EUSO-SPB2 rests on the readout qualification studies; however, these studies are described only under laboratory (bench-top) conditions. No data or analysis is provided on thermal-vacuum cycling, pressure testing, or radiation exposure of the integrated detector-readout chain, leaving the mapping to float-altitude performance unverified.
minor comments (1)
  1. The abstract would be strengthened by inclusion of at least one quantitative performance metric (e.g., single-photoelectron resolution, timing jitter, or power consumption) obtained from the AGET qualification measurements.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive comments on our manuscript describing the development of the Cherenkov telescope. We address the major comment point by point below.

read point-by-point responses

  1. Referee: [readout qualification studies and mechanical integration] The central claim that the SiPM + AGET telescope is qualified for EUSO-SPB2 rests on the readout qualification studies; however, these studies are described only under laboratory (bench-top) conditions. No data or analysis is provided on thermal-vacuum cycling, pressure testing, or radiation exposure of the integrated detector-readout chain, leaving the mapping to float-altitude performance unverified.

    Authors: The manuscript presents laboratory qualification studies of the readout concept as an initial development step, along with optics and mechanical integration design; it does not assert that the system is fully qualified for EUSO-SPB2 flight conditions. The abstract and text explicitly frame the work as 'studies to qualify the readout concept' under controlled bench-top conditions. Environmental testing (thermal-vacuum, pressure, radiation) of the integrated chain is indeed absent from this paper, as the scope is limited to the design and initial lab validation of the SiPM-AGET approach. We agree this leaves the direct mapping to float-altitude performance unaddressed here. In revision we will add explicit language clarifying the limited scope of the presented studies and noting that full environmental qualification is planned as subsequent work for the EUSO-SPB2 integration campaign. revision: partial

Circularity Check

0 steps flagged

No circularity; instrumentation description with no derivations or self-referential claims.

full rationale

The paper is a technical report on hardware development for a 1 m² Cherenkov telescope using SiPMs and AGET readout. It presents optics design, lab qualification studies for the readout, and mechanical integration details. No equations, predictions, fitted parameters, or derivation chains are described that could reduce to inputs by construction. No self-citation load-bearing steps or uniqueness theorems are invoked. The work is self-contained as a straightforward instrumentation paper.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is an instrumentation development paper. No free parameters, mathematical axioms, or invented physical entities are introduced.

pith-pipeline@v0.9.0 · 5948 in / 1141 out tokens · 16407 ms · 2026-05-24T19:05:13.304750+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Reference graph

Works this paper leans on

16 extracted references · 16 canonical work pages · 4 internal anchors

  1. [1]

    M. G. Aartsen, et al., Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector, Science 342 (6161) (2013) 1242856

    work page 2013

  2. [2]

    Alves Batista, et al., Open Questions in Cosmic-Ray Research at Ultrahigh Energies arXiv:1903.06714

    R. Alves Batista, et al., Open Questions in Cosmic-Ray Research at Ultrahigh Energies arXiv:1903.06714

    work page arXiv 1903

  3. [3]

    L. A. Anchordoqui, Ultra-high-energy cosmic rays, Physics Reports 801 (2019) 1

    work page 2019

  4. [4]

    P. S. Bhupal Dev, et al., Neutrino Non-Standard Interactions: A Status Report arXiv:1907.00991

    work page arXiv 1907

  5. [5]

    S. R. Klein et al., Neutrino Absorption in the Earth, Neutrino Cross-Sections, and New Physics arXiv:1304.4891

    work page internal anchor Pith review Pith/arXiv arXiv

  6. [6]

    Fundamental Physics with High-Energy Cosmic Neutrinos

    M. Ackermann, et al., Fundamental Physics with High-Energy Cosmic Neutrinos arXiv:1903.04333

    work page internal anchor Pith review Pith/arXiv arXiv 1903

  7. [7]

    K. Murase et al., Constraining very heavy dark matter using diffuse backgrounds of neutrinos and cascaded gamma rays, Journal of Cosmology and Astroparticle Physics 2012 (10) (2012) 43

    work page 2012

  8. [8]

    A. V . Olinto, et al., POEMMA: Probe Of Extreme Multi-Messenger Astrophysics, in 35th International Cosmic Ray Conference Busan, Korea2017 arXiv:1708.07599

    work page internal anchor Pith review Pith/arXiv arXiv

  9. [9]

    Fargion, et al., Horizontal Tau air showers from mountains in deep valley

    D. Fargion, et al., Horizontal Tau air showers from mountains in deep valley. Traces of UHECR neutrino tau arXiv:astro–ph/9906450

    work page arXiv

  10. [10]

    J. H. Adams, et al., White paper on EUSO-SPB2 arXiv:1703.04513

    work page internal anchor Pith review Pith/arXiv arXiv

  11. [11]

    Wiencke, The Extreme Universe Space Observatory on a Super-Pressure Balloon II Mission, in 36th International Cosmic Ray Conference, 2019 PoS (ICRC2019) 466

    L. Wiencke, The Extreme Universe Space Observatory on a Super-Pressure Balloon II Mission, in 36th International Cosmic Ray Conference, 2019 PoS (ICRC2019) 466

    work page 2019

  12. [12]

    Painter, et al., Silicon Photomultipliers for Orbital Ultra High Energy Cosmic Ray Observation, in 36th International Cosmic Ray Conference, 2019 PoS (ICRC2019) 285

    W. Painter, et al., Silicon Photomultipliers for Orbital Ultra High Energy Cosmic Ray Observation, in 36th International Cosmic Ray Conference, 2019 PoS (ICRC2019) 285

    work page 2019

  13. [13]

    A. N. Otte, et al., Characterization of Three High Efficiency and Blue Sensitive Silicon Photomultipliers, NIM A 846 (2016) 106

    work page 2016

  14. [14]

    Gómez, et al., MUSIC: An 8 channel readout ASIC for SiPM arrays International Society for Optics and Photonics2016 98990G

    S. Gómez, et al., MUSIC: An 8 channel readout ASIC for SiPM arrays International Society for Optics and Photonics2016 98990G

    work page

  15. [15]

    Pollacco, et al., GET: A generic electronics system for TPCs and nuclear physics instrumentation, NIM A 887 (2018) 81

    E. Pollacco, et al., GET: A generic electronics system for TPCs and nuclear physics instrumentation, NIM A 887 (2018) 81

    work page 2018

  16. [16]

    Scotti, 36th International Cosmic Ray Conference, in 36th International Cosmic Ray Conference, 2019 PoS (ICRC2019) 420

    V . Scotti, 36th International Cosmic Ray Conference, in 36th International Cosmic Ray Conference, 2019 PoS (ICRC2019) 420. 7

    work page 2019