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arxiv: 2606.26409 · v1 · pith:6J6TRJIWnew · submitted 2026-06-24 · 🌌 astro-ph.IM · hep-ex

In situ cryogenic characterization of proton damage in thick p-channel skipper CCDs

Brandon M. Roach , Brenda Cervantes Vergara , Alex Drlica-Wagner , Phoenix Alpine , Ana Martina Botti , Claudio Chavez , Julian Cuevas-Zepeda , Juan Estrada
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Guillermo Fernandez Moroni Nora Hoch Stephen E. Holland Blas Irigoyen Gimenez Agustin Lapi Santiago Perez Nathan Saffold Javier Tiffenberg Yikai Wu
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Pith reviewed 2026-06-26 00:43 UTC · model grok-4.3

classification 🌌 astro-ph.IM hep-ex
keywords skipper CCDradiation hardnessproton damagecryogenic characterizationp-channel CCDspace instrumentationcharge transfer inefficiencydark current
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The pith

P-channel skipper CCDs maintain excellent performance after proton doses equivalent to 10 years at L2 when tested cryogenically

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

This paper reports the first radiation-hardness tests of p-channel skipper CCDs performed at their cryogenic operating temperatures rather than room temperature. The devices receive proton irradiation doses meant to match the displacement damage expected over roughly 10 years at the Earth-Sun L2 point. Performance metrics including charge transfer inefficiency, dark current, hot pixels, and charge traps show no significant degradation. The result supports the use of these low-noise sensors for long-duration space astronomy in photon-starved regimes.

Core claim

We find that these devices maintain excellent performance after displacement damage doses equivalent to ∼10 years at the Earth/Sun L2 Lagrange point, demonstrating for the first time that these sensors remain radiation-hard in realistic deep-space thermal and radiation environments.

What carries the argument

In-situ cryogenic proton irradiation of thick p-channel skipper CCDs, with assessment of the floating-gate output stage and global parameters such as charge transfer inefficiency, dark current, hot pixels, and charge traps.

If this is right

  • Skipper CCDs can support single-photon counting instruments in deep space for mission durations of at least a decade without radiation-induced performance loss.
  • The p-channel architecture on n-type silicon retains its radiation hardness advantage even when operated at cryogenic temperatures.
  • Repeated non-destructive charge measurements remain viable after exposure to the expected L2 radiation environment.
  • Dark current and hot-pixel rates stay low enough for photon-starved observations after the simulated 10-year dose.

Where Pith is reading between the lines

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

  • Similar in-situ cryogenic irradiation protocols could be applied to qualify other sensor technologies for future space missions.
  • The results reduce the need for heavy shielding on L2 instruments that use these detectors.
  • Longer mission lifetimes or higher-sensitivity observations become more feasible if the hardness holds across the full range of space thermal cycles.

Load-bearing premise

The laboratory proton doses and cryogenic conditions accurately reproduce the displacement damage spectrum and thermal environment the sensors would experience over 10 years at L2.

What would settle it

Observation of substantially higher charge transfer inefficiency or dark current rates in actual flight data after several years at L2 compared with the post-irradiation lab measurements.

Figures

Figures reproduced from arXiv: 2606.26409 by Agustin Lapi, Alex Drlica-Wagner, Ana Martina Botti, Blas Irigoyen Gimenez, Brandon M. Roach, Brenda Cervantes Vergara, Claudio Chavez, Guillermo Fernandez Moroni, Javier Tiffenberg, Juan Estrada, Julian Cuevas-Zepeda, Nathan Saffold, Nora Hoch, Phoenix Alpine, Santiago Perez, Stephen E. Holland, Yikai Wu.

Figure 1
Figure 1. Figure 1: Picture of the CCD characterization and testing system in the clean room at Fermilab, [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Wide view of the testing system at Northwestern Medicine in an adjacent room following [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Single-sample images recorded by one quadrant of CCD #1 approximately 10 minutes (left) [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Plots of readout noise σ versus Nsamp for CCD #1 (left) and CCD #2 (right), as measured at Northwestern Medicine several days after irradiation. The dashed line showing the expected scaling for an ideal skipper CCD with σ1 = 3 e− rms/pix is included to guide the eye. Most amplifiers show nominal 1/ p Nsamp scaling both before and after an equivalent 10-year DDD, except for amplifiers A and B on CCD #2 [PI… view at source ↗
Figure 5
Figure 5. Figure 5: (Top) Parallel CTI (measured under a range of temperatures and conditions) for p-channel and n-channel CCDs before and after irradiation. Irradiation has been normalized to the 12-MeV equivalent proton dose following Ref. [19]. For CCD #2, the data are for Nsamp = 1 only. Additional p-channel skipper CCDs from Vendor #2 are described in Refs. [74, 75]. CCDs from Vendor #1 are not shown, owing to their larg… view at source ↗
Figure 6
Figure 6. Figure 6: (Top) Arrhenius plot for CCD #1 post-irradiation, showing the evolution of dark current with temperature and the consistency with a mid-level trap near Ea ≈ 0.63 eV. We also plot measurements from a non-irradiated sensor from Vendor #1 [70], scaled up by a factor of 103 for visibility. (Bottom) Same, but for CCD #2. The lower initial temperature of 140 K allows us to identify a separate trap species at Ea … view at source ↗
Figure 7
Figure 7. Figure 7: Time-series evolution of the dark current for the four quadrants of CCD #2, with measure [PITH_FULL_IMAGE:figures/full_fig_p020_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Fraction of hot pixels (with charge exceeding a given cutoff) for skipper CCD #2 (blue line) [PITH_FULL_IMAGE:figures/full_fig_p021_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Output transistor curve behavior for CCD #2 at 140 K before (solid lines) and after (points) [PITH_FULL_IMAGE:figures/full_fig_p022_9.png] view at source ↗
read the original abstract

Skipper charge-coupled devices (CCDs) are an offshoot of standard silicon pixel detectors and are capable of performing repeated non-destructive charge measurements, enabling deeply sub-electron readout noise. This capability has opened the door to single-photon counting from the near-infrared ($\sim$1.1\,$\mu$m) to the soft X-ray (several keV), making these devices strong candidates for future astronomical instruments operating in the photon-starved limit. Furthermore, the p-channel architecture used to fabricate Skipper CCDs on n-type silicon has been demonstrated to have an increased hardness to the intense radiation environment of space. Building upon previous irradiation campaigns on room-temperature sensors, here we describe the first radiation-hardness tests of p-channel skipper CCDs at their cryogenic operating temperatures. We assess the performance of the floating-gate output stage and global CCD parameters (charge transfer inefficiency, dark current, hot pixels, and charge traps). We find that these devices maintain excellent performance after displacement damage doses equivalent to ${\sim}$10 years at the Earth/Sun L2 Lagrange point, demonstrating for the first time that these sensors remain radiation-hard in realistic deep-space thermal and radiation environments.

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

2 major / 2 minor

Summary. The manuscript reports the first in-situ cryogenic proton irradiation tests performed on thick p-channel skipper CCDs. It evaluates the floating-gate output stage and global CCD parameters including charge transfer inefficiency, dark current, hot pixels, and charge traps after exposure to displacement damage doses stated to be equivalent to ~10 years at L2, concluding that the sensors maintain excellent performance under combined cryogenic and radiation conditions relevant to deep space.

Significance. If the central claim holds, the result is significant for validating p-channel skipper CCDs as radiation-hard detectors for future space-based astronomical instruments operating in the photon-starved regime. The in-situ cryogenic protocol during irradiation is a clear experimental strength that directly addresses prior gaps in room-temperature-only campaigns.

major comments (2)
  1. [Methods] The headline claim that the devices 'maintain excellent performance' after doses equivalent to ~10 years at L2 is load-bearing on the assumption that the chosen lab proton fluence, energy, and single-run protocol produce equivalent displacement damage (trap density, CTI, dark current) to the integrated L2 spectrum plus annealing history. The methods section provides no quantitative NIEL-based calculation, spectrum folding, or comparison to space proton/ion/neutron contributions that would allow the reader to verify the equivalence margin (Methods, irradiation setup and dose equivalence paragraphs).
  2. [Results] The results section reports positive outcomes but supplies no tabulated pre/post-irradiation values, error bars, or statistical measures for CTI, dark current, or trap densities. Without these numbers it is not possible to assess whether the observed changes remain within the 'excellent performance' margin claimed for the L2-equivalent dose (Results, performance metrics and figures).
minor comments (2)
  1. [Abstract] The abstract states the dose equivalence but does not cite the specific proton energy or fluence used; this should be added for immediate clarity.
  2. [Figures] Figure captions for the performance plots should explicitly label pre- and post-irradiation data sets and include the exact proton fluence applied.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful review and constructive comments, which help strengthen the clarity of our dose-equivalence justification and quantitative results presentation. We address each major comment below.

read point-by-point responses

  1. Referee: [Methods] The headline claim that the devices 'maintain excellent performance' after doses equivalent to ~10 years at L2 is load-bearing on the assumption that the chosen lab proton fluence, energy, and single-run protocol produce equivalent displacement damage (trap density, CTI, dark current) to the integrated L2 spectrum plus annealing history. The methods section provides no quantitative NIEL-based calculation, spectrum folding, or comparison to space proton/ion/neutron contributions that would allow the reader to verify the equivalence margin (Methods, irradiation setup and dose equivalence paragraphs).

    Authors: We agree that an explicit quantitative justification strengthens the manuscript. The original text referenced prior NIEL scaling literature for the L2 equivalence but omitted the detailed steps. In revision we have added a dedicated paragraph (and supporting equations) in the Methods section that performs the NIEL calculation for the laboratory proton energy and fluence, folds it against the L2 proton spectrum, and compares the resulting displacement damage to the integrated proton, ion, and neutron contributions expected over ten years at L2. This addition directly addresses the verification margin requested. revision: yes

  2. Referee: [Results] The results section reports positive outcomes but supplies no tabulated pre/post-irradiation values, error bars, or statistical measures for CTI, dark current, or trap densities. Without these numbers it is not possible to assess whether the observed changes remain within the 'excellent performance' margin claimed for the L2-equivalent dose (Results, performance metrics and figures).

    Authors: We concur that tabulated values with uncertainties improve transparency. We have inserted a new table in the Results section that reports the pre- and post-irradiation means, standard deviations, and sample sizes for CTI, dark current, hot-pixel fraction, and trap densities. Error bars have been added to the relevant performance figures, and the text now references these quantitative values when stating that changes remain within the excellent-performance regime. revision: yes

Circularity Check

0 steps flagged

No circularity: pure experimental characterization with no derivations or self-referential predictions

full rationale

The paper reports laboratory proton irradiation and in-situ cryogenic measurements of CCD performance metrics (CTI, dark current, etc.). The central claim equates lab fluence to an L2-equivalent dose via standard displacement-damage calculations external to the work; no equations, fitted parameters, or self-citations are used to derive the performance results from the inputs. No self-definitional steps, fitted-input predictions, or load-bearing self-citations appear. The equivalence assumption is an external modeling choice, not a circular reduction within the paper's own chain.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is an empirical experimental study. No free parameters, mathematical axioms, or new invented physical entities are introduced or required for the central claim.

pith-pipeline@v0.9.1-grok · 5800 in / 1020 out tokens · 22569 ms · 2026-06-26T00:43:03.099148+00:00 · methodology

discussion (0)

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