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TPB-coated wavelength-shifting fibers collect about 1% of noble-gas scintillation light at high pressure.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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2026-07-11 11:06 UTC pith:DUCW5VA7

load-bearing objection Solid instrumentation paper that delivers the first quantitative ~1% LCE numbers for TPB-coated WLS fibers in high-pressure Xe/Ar, with a clean dual-setup cross-check; useful engineering data for NEXT, not a physics breakthrough.

arxiv 2607.04944 v1 pith:DUCW5VA7 submitted 2026-07-06 physics.ins-det hep-ex

Detection of scintillation light in noble gases with wavelength-shifting optical fibers

S.R. Soleti , S. Torelli , G. Mart\'inez-Lema , H. Almaz\'an , A. Beck , A. Castillo , M. del Barrio-Torregrosa , P. Dietz
show 105 more authors
C. Echeverria L. Gurriana Y. Ifergan I. Israelashvili F. Lopez F. Monrabal E. Oblak J. Pelegrin J.G.M. Saraiva M. Seemann L. Arazi J.J. G\'omez-Cadenas V. \'Alvarez I.J. Arnquist F. Auria-Luna S. Ayet Y. Ayyad C.D.R. Azevedo F. Ballester J.E. Barcelon J.M. Benlloch-Rodr\'iguez F.I.G.M. Borges A. Brodoline E. Church M. Cid X. Cid C.A.N. Conde C. Cortes-Parra F.P. Coss\'io R. Coupe E. Dey M. Elorza R. Esteve R. Felkai L.M.P. Fernandes P. Ferrario F.W. Foss Z. Freixa J. Garc\'ia-Barrena J.W.R. Grocott R. Guenette J. Hauptman C.A.O. Henriques J.A. Hernando Morata P. Herrero-G\'omez V. Herrero C. Herv\'es Carrete A.F.B. Isabel B.J.P. Jones F. Kellerer L. Larizgoitia A. Larumbe P. Lebrun N. L\'opez-March R. Madigan R.D.P. Mano A. Marauri A.P. Marques J. Mart\'in-Albo A. Mart\'inez M. Mart\'inez-Vara R.L. Miller K. Mistry J. Molina-Canteras C.M.B. Monteiro F.J. Mora K.E. Navarro P. Novella D.R. Nygren I. Osborne J. Palacio B. Palmeiro A. Para A. Pazos M. P\'erez Maneiro M. Querol J. Renner I. Rivilla C. Rogero L. Rogers B. Romeo C. Romo-Luque E. Ruiz-Ch\'oliz P. Saharia F.P. Santos J.M.F. dos Santos I. Shomroni A.L.M. Silva P.A.O.C. Silva A. Sim\'on M. Sorel J. Soto-Oton J.M.R. Teixeira S. Teruel-Pardo J.F. Toledo C. Tonnel\'e J. Torrent A. Trettin P.R.G. Valle M. Vanga P. V\'azquez Cabaleiro J.F.C.A. Veloso J.D. Villamil J. Waiton A. Yubero-Navarro
This is my paper
classification physics.ins-det hep-ex
keywords wavelength-shifting fibersTPBscintillation lightgaseous xenongaseous argonlight collection efficiencyhigh-pressure TPCSiPM readout
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

Noble-gas detectors emit scintillation light deep in the vacuum ultraviolet, where ordinary sensors are blind. This paper shows that optical fibers coated with the wavelength shifter TPB can turn that light into visible wavelengths and deliver it to a small number of photosensors with a measured collection efficiency near one percent in both gaseous xenon and argon up to 8.5 bar. Two independent prototypes—one read out by cooled silicon photomultipliers and one by photomultiplier tubes—agree once sensor quantum efficiency is taken into account. The same data also recover the known energy cost of making a scintillation photon under low-recombination conditions. Because the fibers can line the barrel of a large high-pressure TPC and feed only a few hundred cooled sensors, the result offers a practical route to low-background, low-channel-count scintillation readout for next-generation rare-event experiments.

Core claim

TPB-coated wavelength-shifting fibers collect 1.18% of the scintillation photons produced by alphas in high-pressure xenon and 1.07% in argon; an independent PMT-based measurement scales to the same value after photon-detection-efficiency correction, establishing that the fiber system works reliably as a light-collection technology for gaseous noble detectors.

What carries the argument

Light-collection efficiency (LCE), defined as the fraction of primary scintillation photons that produce a photoelectron after wavelength shifting, fiber transport and sensor detection, extracted from alpha peaks after dark-noise subtraction and Geant4 correction for geometric absorption.

Load-bearing premise

The absolute number of scintillation photons produced by each alpha is taken from an external pressure-dependent yield table; any systematic error in that table moves the reported collection efficiency by the same fraction.

What would settle it

Repeat the alpha measurement with an independent absolute light-yield calibration (for example a well-characterized VUV photodiode or a field-on TPC geometry) and check whether the extracted LCE remains consistent with 1%.

Watch this falsifier. Get emailed when new claim-graph text bears on it.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

0 major / 5 minor

Summary. The manuscript reports experimental measurements of light-collection efficiency (LCE) for TPB-coated wavelength-shifting optical fibers in high-pressure gaseous xenon and argon (up to 8.5 bar). Two complementary zero-field prototypes are used: an elongated PTFE-lined vessel with Y11 fibers read by temperature-stabilized SiPMs, and a compact box with BCF-91A fibers read by red-enhanced PMTs, both under continuous purification. Alpha particles from 241Am provide the primary LCE determination via Eq. (1), after SPE calibration, dark-noise subtraction, and Geant4 corrections for source-disk and endcap absorption; the SiPM results are LCE_Xe = 1.18 ± 0.01 (sta.) +0.07/-0.09 (sys.) % and LCE_Ar = 1.07 ± 0.01 (sta.) +0.06/-0.08 (sys.) %. The independent PMT measurement at 1 bar (0.45 %) scales into agreement after PDE correction. Cosmic-muon data yield a pressure-independent light yield that converts, with the measured LCE, to w_sc = 45 ± 7 (sta.) +4/-5 (sys.) eV at 1.5 bar, consistent with literature under low-recombination conditions. Average waveforms are fitted to extract prompt, triplet, and recombination time components. The authors conclude that such fiber systems are a viable, low-channel-count option for S1 readout in future high-pressure Xe TPCs, with the reported LCE an upper limit for a full-scale detector.

Significance. If the results hold, the work supplies a concrete, cross-checked experimental benchmark for TPB-coated WLS-fiber scintillation readout in high-pressure noble gases, directly relevant to the design of NEXT-HD and similar tonne-scale HPGXe-TPCs. The dual-setup agreement (SiPM vs. PMT after PDE scaling), pressure-independent LCE, SPE calibration at every temperature, continuous purification, and explicit framing of the LCE as an upper limit for a realistic TPC with grids and long fibers constitute a solid feasibility demonstration. The cosmic-muon extraction of w_sc that matches published low-recombination values further strengthens the absolute scale. The paper therefore advances a practical alternative to PMT-based S1 systems that reduces radiogenic background and mechanical complexity while remaining compatible with high-pressure operation.

minor comments (5)
  1. Section 4.1 / Eq. (1): the absolute scale of LCE inherits the systematic uncertainty of the Saito et al. (2003) N_γ table. While this does not reverse the feasibility conclusion (the PMT cross-check and w_sc comparison survive a uniform rescaling), a short explicit statement of that external-scale dependence would improve transparency.
  2. Section 4.5: the effective exponential approximation used for the recombination tail (and the noted correlation that pulls the Ar triplet lifetime low relative to literature) should be flagged more clearly as a fit convenience rather than a physical claim.
  3. Figure 10 and Table 1: the pressure dependence of ε_abs is shown, but a one-sentence reminder that the reported LCE is defined only for photons directed toward the fibers (not a full 4π collection efficiency) would help non-specialist readers.
  4. Section 4.2: the discussion of why BCF-91A fibers remain competitive despite lower quoted trapping efficiency and spectral overlap is useful; quantifying the optical-coupling difference more tightly (or noting it as an unmeasured residual) would tighten the comparison.
  5. Minor typographical/consistency items: “Gatekeeper®” vs. SAES model numbers, occasional missing spaces around units, and the arXiv date stamp (2026) should be cleaned in production.

Circularity Check

0 steps flagged

No circularity: LCE is a direct experimental ratio using external absolute yield and geometry MC; w_sc is an independent consistency check.

full rationale

The central result is the measured light-collection efficiency defined by Eq. (1): LCE = (N_p.e. − N_DCR)/(N_γ · ε_abs). N_p.e. and N_DCR are obtained from the present SiPM (or PMT) waveforms; N_γ is taken from the external absolute alpha-yield tables of Saito et al. (IEEE TNS 50, 2452, 2003); ε_abs is a Geant4 geometry factor. Nothing in this ratio is defined in terms of the reported LCE itself, nor is any free parameter fitted to force the LCE value. The independent PMT setup (different fiber brand, different photosensors) yields a PDE-scaled LCE that agrees within uncertainties, providing an external cross-check. The subsequent extraction of w_sc = LCE / LY_muon (Eq. 6) simply converts the separately measured muon light yield into energy-per-photon units; the numerical agreement with literature values under low-recombination conditions is a consistency test, not a circular re-use of the same data. A back-of-the-envelope product of literature trapping, TPB, spectral-overlap and PDE factors also lands at the percent level without reference to the measured spectra. No self-definitional loop, fitted-input-as-prediction, load-bearing self-citation uniqueness claim, or renamed known result appears in the derivation chain. The paper is a self-contained experimental characterization against external benchmarks.

Axiom & Free-Parameter Ledger

2 free parameters · 3 axioms · 0 invented entities

The central LCE numbers rest on three external inputs (absolute alpha yield table, PTFE/SS optical constants, SiPM PDE curves) plus standard SPE calibration. No new physical entities are postulated; free parameters are limited to ordinary fit nuisance parameters that cancel in the final ratio.

free parameters (2)
  • SiPM single-photoelectron gain (per channel, per temperature)
    Extracted from multi-Gaussian fits to dark-pulse spectra; 3.6% relative uncertainty is propagated as systematic but is measured, not freely chosen to force LCE.
  • Crystal Ball peak position for alpha charge spectra
    N_p.e. is obtained by fitting each pressure point; the functional form is conventional and the peak is visually unambiguous.
axioms (3)
  • domain assumption Absolute scintillation photon yield N_γ(P) for 5.49 MeV alphas in Xe and Ar is given by the pressure-dependent values of Saito et al. (2003).
    Used directly in eq. (1) to convert measured photo-electrons into LCE; no independent absolute measurement is performed in this work.
  • domain assumption Stainless-steel source disk is fully absorbing in the VUV and PTFE end-cap reflectivity follows the wavelength-dependent values of Silva et al. (2010).
    These optical constants enter the Geant4 evaluation of ε_abs; the dominant systematic is obtained by varying them.
  • domain assumption Photon detection efficiency of the S13360-6075PE SiPM averaged over the Y11 emission spectrum is 46%.
    Taken from manufacturer data sheet and used both for back-of-envelope estimate and for scaling the PMT result.

pith-pipeline@v1.1.0-grok45 · 30215 in / 2690 out tokens · 30874 ms · 2026-07-11T11:06:53.202679+00:00 · methodology

0 comments
read the original abstract

Wavelength-shifting (WLS) techniques enable particle detectors based on noble gases, whose scintillation light is predominantly emitted in the vacuum-ultraviolet. We investigate WLS fibers coated with tetraphenyl butadiene (TPB) for scintillation light detection in gaseous xenon and argon at pressures up to 8.5 bar, motivated by future high-pressure xenon time-projection chambers of the NEXT program. Two detector configurations are studied: an elongated high-pressure vessel with four PTFE panels equipped with WLS fibers read by temperature-stabilized SiPMs, and a compact box-shaped detector operated at 1 bar Xe with WLS fibers read out by PMTs. Both operate with continuous gas purification. The detector response is characterized using cosmic muons and alpha particles from a $^{241}$Am source. With the SiPM setup, we measure a light collection efficiency (LCE) of ${1.18 \pm 0.01~\mathrm{(sta.)}~^{+0.07}_{-0.09}~\mathrm{(sys.)}~\%}$ for xenon and ${1.07 \pm 0.01~\mathrm{(sta.)}~^{+0.06}_{-0.08}~\mathrm{(sys.)}~\%}$ for argon. With PMT readout, we measure a LCE of ${0.45 \pm 0.01~\mathrm{(sta.)} \pm 0.05~\mathrm{(sys.)}~\%}$ in xenon, in agreement with the SiPM result once photon detection efficiency is accounted for. Average scintillation waveforms in xenon and argon are studied to assess the time structure of the emitted light. Cosmic-muon measurements yield a mean energy required to produce a scintillation photon $45\pm7~\mathrm{(sta.)}~^{+4}_{-5}~\mathrm{(sys.)}~\mathrm{eV}$ at 1.5 bar, in agreement with the literature. The results demonstrate that TPB-coated WLS fiber systems can reliably detect scintillation light in high-pressure gaseous noble detectors, with a LCE representing an upper limit for realistic large-scale TPCs, where additional photon losses from materials and fiber attenuation are expected.

discussion (0)

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