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arxiv: 1907.02173 · v1 · pith:L4TSSRJRnew · submitted 2019-07-04 · 🌌 astro-ph.IM · astro-ph.HE· hep-ex

The on-orbit calibration of DArk Matter Particle Explorer

G. Ambrosi , Q. An , R. Asfandiyarov , P. Azzarello , P. Bernardini , M. S. Cai , M. Caragiulo , J. Chang
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D. Y. Chen H. F. Chen J. L. Chen W. Chen M. Y. Cui T. S. Cui H. T. Dai A. D'Amone A. De Benedittis I. De Mitri M. Ding M. Di Santo J. N. Dong T. K. Dong Y. F. Dong Z. X. Dong D. Droz K. K. Duan J. L. Duan D. D'Urso R. R. Fan Y. Z. Fan F. Fang C. Q. Feng L. Feng P. Fusco V. Gallo F. J. Gan M. Gao S. S. Gao F. Gargano S. Garrappa K. Gong Y. Z. Gong J. H. Guo Y. M. Hu G. S. Huang Y. Y. Huang M. Ionica D. Jiang W. Jiang X. Jin J. Kong S. J. Lei S. Li X. Li W. L. Li Y. Li Y. F. Liang Y. M. Liang N. H. Liao C. M. Liu H. Liu J. Liu S. B. Liu W. Q. Liu Y. Liu F. Loparco M. Ma P. X. Ma S. Y. Ma T. Ma X. Q. Ma X. Y. Ma G. Marsella M.N. Mazziotta D. Mo X. Y. Niu X. Pan X. Y. Peng W. X. Peng R. Qiao J. N. Rao M. M. Salinas G. Z. Shang W. H. Shen Z. Q. Shen Z. T. Shen J. X. Song H. Su M. Su Z. Y. Sun A. Surdo X. J. Teng X. B. Tian A. Tykhonov S. Vitillo C. Wang H. Wang H. Y. Wang J. Z. Wang L. G. Wang Q. Wang S. Wang X. H. Wang X. L. Wang Y. F. Wang Y. P. Wang Y. Z. Wang Z. M. Wang S. C. Wen D. M. Wei J. J. Wei Y. F. Wei D. Wu J. Wu L. B. Wu S. S. Wu X. Wu K. Xi Z. Q. Xia Y. L. Xin H. T. Xu Z. H. Xu Z. L. Xu Z. Z. Xu G. F. Xue H. B. Yang P. Yang Y. Q. Yang Z. L. Yang H. J. Yao Y. H. Yu Q. Yuan C. Yue J. J. Zang D. L. Zhang F. Zhang J. B. Zhang J. Y. Zhang J. Z. Zhang L. Zhang P. F. Zhang S. X. Zhang W. Z. Zhang Y. Zhang Y. J. Zhang Y. Q. Zhang Y. L. Zhang Y. P. Zhang Z. Zhang Z. Y. Zhang H. Zhao H. Y. Zhao X. F. Zhao C. Y. Zhou Y. Zhou X. Zhu Y. Zhu S. Zimmer
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Pith reviewed 2026-05-25 09:37 UTC · model grok-4.3

classification 🌌 astro-ph.IM astro-ph.HEhep-ex
keywords calibrationon-orbitdetectorresultscosmicdampedarkdecember
0
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The pith

DAMPE sub-detectors (PSD, STK, BGO, NUD) are calibrated on-orbit with cosmic rays and gamma sources, with results showing stability over nearly two years.

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

DAMPE is a satellite instrument launched in 2015 to measure cosmic rays and gamma rays in search of dark matter signals. Its detectors include a plastic scintillator for charge measurement, a silicon tracker for particle paths, a BGO calorimeter for energy, and a neutron detector. The paper describes how the team used natural high-energy particles from space, bright known gamma sources, and electronic test pulses to set the scale and response of each part. They also mapped the South Atlantic Anomaly region where the detector is turned off and measured the live time fraction. After almost two years, the calibration constants remained stable enough for continued science data taking.

Core claim

The calibration results demonstrate the stability of the detectors in almost two years of the on-orbit operation.

Load-bearing premise

That the chosen Galactic cosmic-ray samples, known GeV gamma-ray sources, and charge-injection pulses provide sufficient coverage and lack unknown time-dependent systematics that would invalidate the reported stability.

read the original abstract

The DArk Matter Particle Explorer (DAMPE), a satellite-based cosmic ray and gamma-ray detector, was launched on December 17, 2015, and began its on-orbit operation on December 24, 2015. In this work we document the on-orbit calibration procedures used by DAMPE and report the calibration results of the Plastic Scintillator strip Detector (PSD), the Silicon-Tungsten tracKer-converter (STK), the BGO imaging calorimeter (BGO), and the Neutron Detector (NUD). The results are obtained using Galactic cosmic rays, bright known GeV gamma-ray sources, and charge injection into the front-end electronics of each sub-detector. The determination of the boundary of the South Atlantic Anomaly (SAA), the measurement of the live time, and the alignments of the detectors are also introduced. The calibration results demonstrate the stability of the detectors in almost two years of the on-orbit operation.

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 documents the on-orbit calibration procedures and results for DAMPE's sub-detectors (PSD, STK, BGO, NUD) using Galactic cosmic rays, known GeV gamma-ray sources, and charge-injection pulses. It also covers SAA boundary determination, live-time measurement, and detector alignments, with the central claim being that the derived calibration constants demonstrate stability over nearly two years of operation since December 2015.

Significance. If the stability holds under the stated methods, the work is important for validating DAMPE's long-term data quality in cosmic-ray and gamma-ray observations. The multi-reference approach (external GCR samples, bright sources, and internal charge injection) is a strength that reduces reliance on any single method.

major comments (2)
  1. [Abstract and results sections] Abstract and results sections: The stability claim rests on the assumption that the chosen GCR, gamma-source, and charge-injection samples are free of unknown time-dependent systematics (e.g., radiation damage or uncorrected SAA variations). No independent cross-check against a physics observable with a priori known absolute scale is presented that could falsify correlated hidden drifts.
  2. [Calibration results for each sub-detector] Calibration results for each sub-detector: Quantitative error budgets, statistical tests for constancy, or limits on possible drifts are not reported, making it impossible to assess whether the observed parameter constancy excludes drifts at the level relevant to DAMPE science goals.
minor comments (2)
  1. Figure captions and axis labels in the stability plots could explicitly state the time baseline and reference values used for normalization.
  2. A short table summarizing the number of events or sources used per calibration channel and per time bin would improve traceability.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the detailed review and constructive feedback on our manuscript documenting the on-orbit calibration of DAMPE. We address the two major comments point by point below.

read point-by-point responses

  1. Referee: [Abstract and results sections] Abstract and results sections: The stability claim rests on the assumption that the chosen GCR, gamma-source, and charge-injection samples are free of unknown time-dependent systematics (e.g., radiation damage or uncorrected SAA variations). No independent cross-check against a physics observable with a priori known absolute scale is presented that could falsify correlated hidden drifts.

    Authors: The manuscript demonstrates stability through consistency among three distinct calibration approaches: Galactic cosmic rays (external reference with known spectral properties), bright GeV gamma-ray sources (known energies), and charge-injection pulses (direct monitoring of front-end electronics). The SAA region is identified separately via count-rate thresholds and excluded from the calibration samples. While the work does not include an additional cross-check based on a physics observable possessing an a priori absolute scale, the agreement across independent methods over nearly two years supports the absence of significant correlated drifts. We will revise the discussion section to explicitly note this reliance on multi-method consistency and any associated limitations. revision: partial

  2. Referee: [Calibration results for each sub-detector] Calibration results for each sub-detector: Quantitative error budgets, statistical tests for constancy, or limits on possible drifts are not reported, making it impossible to assess whether the observed parameter constancy excludes drifts at the level relevant to DAMPE science goals.

    Authors: We agree that the presentation would benefit from quantitative measures. In the revised manuscript we will add error estimates to the time series of calibration constants for each sub-detector, include statistical tests (such as chi-squared assessments of constancy), and report upper limits on any residual time-dependent drifts where the data permit. revision: yes

Circularity Check

0 steps flagged

No circularity: calibration results are direct empirical measurements against external references

full rationale

The paper documents on-orbit calibration procedures for DAMPE sub-detectors using Galactic cosmic rays, known GeV gamma-ray sources, and charge-injection pulses, then reports measured stability of constants over ~2 years. No derivation chain, fitted model, or prediction is presented that reduces to its own inputs by construction. All results are direct comparisons to independent external references. This matches the reader's assessment of low circularity burden; no load-bearing self-citation, ansatz, or self-definitional step exists in the provided text.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Calibration constants are fitted to cosmic-ray and charge-injection data; the paper does not enumerate them or state how many free parameters per sub-detector are adjusted. No invented entities or non-standard axioms are mentioned in the abstract.

pith-pipeline@v0.9.0 · 6532 in / 1009 out tokens · 22436 ms · 2026-05-25T09:37:39.817532+00:00 · methodology

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