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arxiv: 2606.30181 · v1 · pith:TMCG4ONPnew · submitted 2026-06-29 · ⚛️ physics.ins-det · hep-ex

Test of a partly instrumented highly compact and granular electromagnetic calorimeter in an electron beam of 1 to 6 GeV

Adri\'an Irles (1) (on behalf of the FCAL Collaboration , (1) IFIC , Universitat de Val\`encia , CSIC , Paterna , Spain) This is my paper

Pith reviewed 2026-06-30 03:30 UTC · model grok-4.3

classification ⚛️ physics.ins-det hep-ex
keywords electromagnetic calorimetersilicon-tungstentest beamLUXE experimentgranular detectorCSIS moduleparticle physics instrumentation
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The pith

A partially instrumented silicon-tungsten calorimeter prototype has been tested with 1 to 6 GeV electrons, yielding initial calibration and shower data.

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

The paper describes the development of compact, finely segmented silicon-tungsten electromagnetic calorimeters for the LUXE experiment and future colliders. A partially instrumented prototype was exposed to an electron beam in the 1-6 GeV range as part of the 2025 test beam campaign. Results include minimum-ionizing particle calibration and event displays that illustrate electromagnetic shower development in the granular detector. These findings represent a key milestone in validating the Compact Silicon Sandwich technology for high-occupancy environments.

Core claim

Highly compact and finely segmented silicon-tungsten electromagnetic calorimeters are being developed within the FCAL collaboration for applications in the LUXE experiment at DESY and future electron-positron collider facilities. These detectors combine tungsten absorber plates with thin silicon pad sensors, providing a small effective Molière radius and high spatial granularity. The fundamental active unit is the Compact Silicon Sandwich (CSIS), integrating a silicon pad sensor together with signal routing, high-voltage distribution and mechanical support in a highly compact structure. A partially instrumented prototype of such a calorimeter has been tested in an electron beam with energies

What carries the argument

The Compact Silicon Sandwich (CSIS) module, which integrates a silicon pad sensor with signal routing, high-voltage distribution and mechanical support in a highly compact structure.

If this is right

  • The CSIS modules can be assembled into larger calorimeters using the dedicated silicon detector integration infrastructure.
  • High spatial granularity enables resolution of nearby electromagnetic showers in high-occupancy environments.
  • The small effective Molière radius supports use in future electron-positron collider experiments.
  • These test beam results form a foundation for full instrumentation and operation in the LUXE experiment.

Where Pith is reading between the lines

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

  • If the observed MIP calibration holds, the design could support luminosity measurements at LUXE by providing precise shower position data.
  • The modular CSIS approach might extend to other high-energy physics detectors requiring compact granularity beyond LUXE.
  • Additional tests varying beam intensity or adding hadronic components could further test scaling assumptions.

Load-bearing premise

The performance observed with the partial instrumentation and test beam conditions will scale to and validate the fully instrumented calorimeter under the operating conditions of the LUXE experiment.

What would settle it

Inconsistent minimum-ionizing particle signals across channels or event displays that fail to show expected electromagnetic shower shapes for 1-6 GeV electrons would indicate the prototype does not support the validation claim.

Figures

Figures reproduced from arXiv: 2606.30181 by (1) IFIC, Adri\'an Irles (1) (on behalf of the FCAL Collaboration, CSIC, Paterna, Spain), Universitat de Val\`encia.

Figure 1
Figure 1. Figure 1: Left: schematic layout of a CSIS module, showing (from top to bottom) the HV [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Sketch of the test beam set-up in 2025. Upper figure: expanded view of the [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Left: example of the signal distribution measured in a single pad for minimum [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
read the original abstract

Highly compact and finely segmented silicon-tungsten electromagnetic calorimeters are being developed within the FCAL collaboration for applications in the LUXE experiment at DESY and future electron-positron collider facilities. These detectors combine tungsten absorber plates with thin silicon pad sensors, providing a small effective Moli\`ere radius and high spatial granularity, which are essential for resolving nearby electromagnetic showers in high-occupancy environments. The fundamental active unit of this calorimeter concept is the Compact Silicon Sandwich (CSIS), integrating a silicon pad sensor together with signal routing, high-voltage distribution and mechanical support in a highly compact structure. The assembly of these CSIS modules is performed within a dedicated infrastructure for silicon detector integration. A partially instrumented prototype of such a calorimeter has been tested in an electron beam with energies between 1 and 6~GeV. First results from the 2025 test beam campaign are presented, including minimum-ionizing particle calibration and preliminary event displays illustrating the shower development in the highly granular detector. These results constitute an important step towards the validation of this technology for LUXE and future collider experiments.

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 / 1 minor

Summary. The manuscript reports the development of compact silicon-tungsten electromagnetic calorimeters using CSIS modules for the LUXE experiment and presents first results from a 2025 test-beam campaign of a partially instrumented prototype exposed to 1-6 GeV electrons. It includes minimum-ionizing-particle calibration and preliminary event displays of shower development, framing these as an important validation step for LUXE and future colliders.

Significance. If expanded with quantitative performance metrics, the work could provide an initial demonstration of the CSIS integration approach and high-granularity response in a test-beam environment. The current preliminary presentation, however, offers limited new information beyond the existence of the test.

major comments (2)
  1. [Abstract] Abstract (final paragraph): the claim that the MIP calibration and event displays 'constitute an important step towards the validation of this technology for LUXE' is not supported by any reported quantitative figures of merit (energy resolution, linearity, position resolution, or shower containment) or by comparison to full-geometry simulation.
  2. [Abstract] Abstract: no discussion is provided of how the partial instrumentation (missing layers or channels) affects electromagnetic shower development relative to the complete multilayer stack, nor of the representativeness of 1-6 GeV test-beam conditions for LUXE occupancies and backgrounds.
minor comments (1)
  1. [Abstract] The abstract would benefit from a brief statement of the number of instrumented layers or channels in the prototype.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful review and constructive comments. We agree that the abstract overstates the significance of the preliminary results and will revise it to better reflect the scope of the presented data. We address the points below.

read point-by-point responses

  1. Referee: [Abstract] Abstract (final paragraph): the claim that the MIP calibration and event displays 'constitute an important step towards the validation of this technology for LUXE' is not supported by any reported quantitative figures of merit (energy resolution, linearity, position resolution, or shower containment) or by comparison to full-geometry simulation.

    Authors: We agree that the manuscript does not report quantitative figures of merit or simulation comparisons, as the results are preliminary. We will revise the final paragraph of the abstract to remove the unsupported claim and instead describe the MIP calibration and event displays as initial results from the test-beam campaign. revision: yes

  2. Referee: [Abstract] Abstract: no discussion is provided of how the partial instrumentation (missing layers or channels) affects electromagnetic shower development relative to the complete multilayer stack, nor of the representativeness of 1-6 GeV test-beam conditions for LUXE occupancies and backgrounds.

    Authors: The current manuscript focuses on the first results from the partially instrumented prototype without addressing these aspects. We will add a brief discussion in the abstract (and introduction if space permits) noting the limitations of partial instrumentation and the beam energy range relative to LUXE conditions, with the understanding that fuller studies are planned. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental test-beam report with no derivations or models

full rationale

The manuscript is an experimental report describing a 2025 test-beam campaign on a partially instrumented CSIS prototype. It presents MIP calibration data and qualitative event displays from 1-6 GeV electrons. No equations, parameter fits, predictions, or theoretical derivations appear anywhere in the text. The central claim is simply that the observed data constitute a step toward validation; this is a direct empirical statement, not a reduction of any output to fitted inputs or self-citations. All load-bearing content is external measurement, so no circularity patterns apply.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The abstract does not provide details on any free parameters, axioms, or invented entities used in the work.

pith-pipeline@v0.9.1-grok · 5762 in / 1032 out tokens · 69852 ms · 2026-06-30T03:30:14.655601+00:00 · methodology

discussion (0)

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Reference graph

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