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arxiv: 2606.26576 · v1 · pith:GMTCCIXHnew · submitted 2026-06-25 · 🌌 astro-ph.IM · astro-ph.CO

Detectors for CLASS-W2: The second 90 GHz telescope of the Cosmology Large Angular Scale Surveyor

John W. Appel , Kyuyoung Bae , Charles L. Bennett , Michael K. Brewer , Sarah Marie Bruno , Carol Yan Yan Chan , Joseph Cleary , Sumit Dahal
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Jullianna Denes Couto Kevin L. Denis Shannon M. Duff Joseph R. Eimer Thomas Essinger-Hileman Naina Gupta Johannes Hubmayr Gregory Jaehnig John Karakla Matthew Koc Jeff Van Lanen Yunyang Li Michael J. Link Tammy Lucas Tobias Marriage Carolina Morales Perez Matthew A. Petroff Caleigh Ryan Rui Shi Deniz A. N. Valle Edward J. Wollack
This is my paper

Pith reviewed 2026-06-26 04:21 UTC · model grok-4.3

classification 🌌 astro-ph.IM astro-ph.CO
keywords CMB polarizationTES bolometers90 GHz detectorsnoise equivalent temperaturemapping speedCLASS experimentfeedhorn coupling
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The pith

The CLASS-W2 four-module detector array reaches NET of 16 μK√s and boosts 90 GHz mapping speed by 41%.

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, lab testing, and on-sky commissioning of a second 90 GHz receiver for the CLASS experiment. Its focal plane uses 296 feedhorn-coupled TES bolometers in four modules, with measured properties including 94% yield, 95.2 GHz center frequency, and optical efficiency of 0.37 after installing a 157 GHz low-pass filter to cut blue-leak power. A sympathetic reader would care because this hardware addition directly raises the rate at which the telescope can map large-scale CMB polarization patterns needed to study inflation and reionization.

Core claim

The focal plane consists of four modules, each containing 37 feedhorns coupling orthogonal polarizations onto two TES bolometers, for a total of 296 optically sensitive detectors. Laboratory tests show highly uniform TES properties with an array average critical temperature of 184 mK, a thermal conductance of 460 pW/K, and a normal resistance of 7.8 mOhms. The detector array has an average band center frequency of 95.2 GHz with 28.3 GHz bandwidth, and achieves a detector yield of 94%. On-sky measurements indicate a mean detector optical load of 3.3 pW. The array's average beam solid angle is 124 μsr, with a full width at half maximum of 0.592 degrees, and the end-to-end average optical effic

What carries the argument

Four-module focal plane of feedhorn-coupled TES bolometers that converts 90 GHz radiation to electrical signals while delivering uniform performance and low noise after blue-leak filtering.

If this is right

  • The array delivers 94% yield with average critical temperature 184 mK and thermal conductance 460 pW/K.
  • Mean optical load of 3.3 pW corresponds to antenna temperature of about 23 K with 0.37 end-to-end efficiency.
  • Metal-mesh filter at 157 GHz cutoff reduces blue-leak power by 0.9 pW.
  • Beam solid angle of 124 μsr and FWHM of 0.592 degrees support the targeted angular resolution.

Where Pith is reading between the lines

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

  • Higher mapping speed could shorten the calendar time needed to reach target sensitivity on the largest angular scales.
  • The modular design and filter solution may be adapted to other frequency bands in the same experiment.

Load-bearing premise

The reported on-sky optical load, beam solid angle, and NET values accurately reflect end-to-end performance under nominal observing conditions without unaccounted systematic offsets in the absolute calibration or atmospheric subtraction.

What would settle it

An independent on-sky test that measures NET above 16 μK√s or a mapping-speed gain below 41% under the same conditions would show the performance claim does not hold.

read the original abstract

The Cosmology Large Angular Scale Surveyor (CLASS) is measuring the Cosmic Microwave Background (CMB) polarization anisotropy on the largest angular scales (>1 degree) to probe the epochs of inflation and reionization. To enhance the CMB mapping speed, we have built, tested, and commissioned in August 2025 a second 90 GHz receiver (CLASS-W2) with a detector focal plane composed of feedhorn-coupled Transition Edge Sensor (TES) bolometers fabricated at NIST-Boulder. The focal plane consists of four modules, each containing 37 feedhorns coupling orthogonal polarizations onto two TES bolometers, for a total of 296 optically sensitive detectors. Laboratory tests show highly uniform TES properties with an array average critical temperature of 184+-3 mK, a thermal conductance of 460+-47 pW/K, and a normal resistance of 7.8+-0.3 mOhms. The detector array has an average band center frequency of 95.2 GHz with 28.3 GHz bandwidth, and achieves a detector yield of 94%. On-sky measurements indicate a mean detector optical load of 3.3 pW, corresponding to an antenna temperature of ~23 K. The array's average beam solid angle is 124 $\mu$sr, with a full width at half maximum of 0.592 degrees, and the end-to-end average optical efficiency is 0.37. We find that high-frequency 'blue-leak' radiation couples directly to the TES bolometer islands; adding a metal-mesh low-pass filter with cutoff frequency of 157 GHz in front of the focal plane suppresses the 'blue-leak' power by 0.9 pW. The four-module array achieves a noise-equivalent temperature of NET= 16 uKrtS. Adding this array has boosted the CLASS 90 GHz mapping speed by 41%.

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 / 2 minor

Summary. The manuscript describes the design, fabrication at NIST-Boulder, laboratory testing, and on-sky commissioning of the CLASS-W2 90 GHz receiver, a four-module focal plane with 296 feedhorn-coupled TES bolometers. Laboratory results report uniform TES parameters (Tc = 184 ± 3 mK, G = 460 ± 47 pW/K, Rn = 7.8 ± 0.3 mΩ), 94% yield, 95.2 GHz band center with 28.3 GHz bandwidth, and 0.37 end-to-end optical efficiency. On-sky data give 3.3 pW mean optical load, 124 μsr beam solid angle, and NET = 16 μK√s, from which a 41% increase in CLASS 90 GHz mapping speed is derived. A metal-mesh filter is shown to suppress blue-leak power by 0.9 pW.

Significance. If the reported on-sky metrics are robust, the work provides a concrete, empirically measured improvement in mapping speed for the CLASS large-angular-scale CMB polarization survey. The high yield, uniform array properties, and direct (non-model-dependent) measurements of load, beam, efficiency, and NET constitute clear strengths for an instrumentation paper.

major comments (1)
  1. [On-sky measurements] On-sky measurements (abstract and corresponding results section): The headline values (optical load 3.3 pW, efficiency 0.37, NET = 16 μK√s, and the resulting 41% mapping-speed boost) are derived from on-sky timestreams, yet the manuscript provides no description of the absolute calibration source, the frequency band or integration used for NET estimation, or the atmospheric template subtraction procedure. Because a scale error in the calibration factor would shift both the reported load and the derived NET by the same factor, this omission directly affects the central performance claim and must be addressed with explicit methodological detail.
minor comments (2)
  1. [Abstract] Abstract: the notation 'uKrtS' is nonstandard and should be written explicitly as μK √s; 'mOhms' should use the proper ohm symbol (mΩ).
  2. [On-sky measurements] The blue-leak filter correction is stated to suppress 0.9 pW, but its quantitative impact on the final NET value is not separated from other contributions; a short dedicated sentence or table entry would improve clarity.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive comment on the on-sky measurements. We agree that additional methodological detail is needed to support the central performance claims and have revised the manuscript accordingly.

read point-by-point responses

  1. Referee: [On-sky measurements] On-sky measurements (abstract and corresponding results section): The headline values (optical load 3.3 pW, efficiency 0.37, NET = 16 μK√s, and the resulting 41% mapping-speed boost) are derived from on-sky timestreams, yet the manuscript provides no description of the absolute calibration source, the frequency band or integration used for NET estimation, or the atmospheric template subtraction procedure. Because a scale error in the calibration factor would shift both the reported load and the derived NET by the same factor, this omission directly affects the central performance claim and must be addressed with explicit methodological detail.

    Authors: We agree that the manuscript as submitted lacks sufficient detail on the absolute calibration, NET integration, and atmospheric subtraction procedures. In the revised version we will insert a dedicated subsection (new Section 4.3) that explicitly describes: (1) the chopped thermal-load calibration source and its coupling to the telescope, (2) the precise frequency band (90 GHz nominal) and integration window used for the NET estimate, and (3) the atmospheric template subtraction algorithm together with the residual power after subtraction. These additions will allow readers to assess the robustness of the reported 3.3 pW load, 0.37 efficiency, and 16 μK√s NET without ambiguity. revision: yes

Circularity Check

0 steps flagged

No circularity; all results are direct empirical measurements

full rationale

The paper reports laboratory characterizations (Tc, G, Rn, band center) and on-sky quantities (optical load, beam solid angle, efficiency, NET) as measured values from fabricated hardware and telescope observations. No equations, model fits, or predictions are presented that reduce to their own inputs by construction. The 41% mapping-speed increase is a straightforward arithmetic combination of the measured NET values and is not derived from any self-referential ansatz or self-citation chain. No load-bearing steps match any of the enumerated circularity patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The central claims rest entirely on laboratory and on-sky measurements of standard TES bolometer devices; no free parameters, background axioms, or new physical entities are introduced.

pith-pipeline@v0.9.1-grok · 6020 in / 1029 out tokens · 53643 ms · 2026-06-26T04:21:04.886184+00:00 · methodology

discussion (0)

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Reference graph

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