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arxiv: 1907.05449 · v1 · pith:JWC7DCWBnew · submitted 2019-07-11 · ⚛️ physics.plasm-ph · physics.app-ph

A novel, compact and portable 2-LTD-Brick x-pinch radiation source: its development and radiation performance

Pith reviewed 2026-05-24 22:29 UTC · model grok-4.3

classification ⚛️ physics.plasm-ph physics.app-ph
keywords x-pinchLTD brickscompact radiation sourceportable driverx-ray radiationplasma physicspulsed power
0
0 comments X

The pith

A driver made from two slow LTD bricks produces the 1 kA/ns current rise needed for effective x-pinch x-ray sources in a compact portable package.

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

The paper presents a new x-pinch radiation source built from two slow linear transformer driver bricks combined into one compact unit. Traditional x-pinch machines require large Marx generators and are not portable, but this design aims to meet the 1 kA/ns current rate of rise requirement without those components. Short-circuit tests verified the current performance, while x-pinch experiments demonstrated good radiation output. This matters because it could make x-pinch technology practical for a wider range of applications that benefit from smaller size and mobility.

Core claim

The central discovery is that combining two slow LTD bricks into a single solid unit creates a compact and portable x-pinch driver capable of delivering a current rate-of-rise of 1 kA/ns, sufficient for good x-pinch radiation performance, as confirmed by both short-circuit and x-pinch shot tests.

What carries the argument

The 2-LTD-brick assembly, which integrates two linear transformer driver bricks to achieve high dI/dt in a limited volume.

If this is right

  • Short-circuit tests confirm the 1 kA/ns rate of rise.
  • X-pinch shots show good radiation performance.
  • The design has potential for many x-pinch applications.
  • It avoids the use of traditional Marx generators, pulse-forming lines, and transmission lines.

Where Pith is reading between the lines

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

  • Portable x-pinch sources might enable new experiments in remote locations or smaller labs.
  • The approach could be extended to other pulsed power applications requiring high current rates in compact forms.
  • Scaling the number of bricks might allow higher currents or different radiation characteristics.

Load-bearing premise

Two slow LTD bricks can be combined to deliver the 1 kA/ns current rate of rise in a compact volume without traditional Marx generators, pulse-forming lines, or transmission lines.

What would settle it

A test where the measured current rate of rise falls below 1 kA/ns or where x-pinch shots fail to produce good radiation performance would disprove the effectiveness of the design.

Figures

Figures reproduced from arXiv: 1907.05449 by Roman V Shapovalov.

Figure 1
Figure 1. Figure 1: -6. Radiographs of a 25-μm Nb x [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: -1. Simple series RLC circuit. ...................... [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: -1. The LTD/NRL Brick. .............................. [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: -2. Shot № 101 (top) wit [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 6
Figure 6. Figure 6: -5. A 220-um-diameter pi [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 1
Figure 1. Figure 1: -1 [PITH_FULL_IMAGE:figures/full_fig_p017_1.png] view at source ↗
Figure 1
Figure 1. Figure 1: -2 MHD simulations of "hot spot" formation [5]. Left [PITH_FULL_IMAGE:figures/full_fig_p019_1.png] view at source ↗
Figure 1
Figure 1. Figure 1: -3 Radiographs of an x [PITH_FULL_IMAGE:figures/full_fig_p020_1.png] view at source ↗
Figure 1
Figure 1. Figure 1: -5 A typical x [PITH_FULL_IMAGE:figures/full_fig_p021_1.png] view at source ↗
Figure 1
Figure 1. Figure 1: -6. Radiographs of a 25-μm Nb x [PITH_FULL_IMAGE:figures/full_fig_p023_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: -1. Simple series RLC circuit [PITH_FULL_IMAGE:figures/full_fig_p033_2.png] view at source ↗
Figure 2
Figure 2. Figure 2: -2. RLC circuit curre [PITH_FULL_IMAGE:figures/full_fig_p034_2.png] view at source ↗
Figure 2
Figure 2. Figure 2: -3. "Matched" load versus [PITH_FULL_IMAGE:figures/full_fig_p036_2.png] view at source ↗
Figure 2
Figure 2. Figure 2: -4. Energy transferre [PITH_FULL_IMAGE:figures/full_fig_p038_2.png] view at source ↗
Figure 2
Figure 2. Figure 2: -5. Short-circuit [PITH_FULL_IMAGE:figures/full_fig_p039_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: -1. The LTD/NRL Brick [PITH_FULL_IMAGE:figures/full_fig_p041_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -2. The LTD/NRL brick switch [PITH_FULL_IMAGE:figures/full_fig_p042_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -3. The LTD/NRL brick electrical circuit. [PITH_FULL_IMAGE:figures/full_fig_p044_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -1. Two LTD bricks are simply connected in parallel w [PITH_FULL_IMAGE:figures/full_fig_p045_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -1. Screamer π-section block and subset. [PITH_FULL_IMAGE:figures/full_fig_p048_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -2. Screamer model of 2-LTD-brick x [PITH_FULL_IMAGE:figures/full_fig_p049_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -3. Output x [PITH_FULL_IMAGE:figures/full_fig_p050_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -5 presents a Screamer s [PITH_FULL_IMAGE:figures/full_fig_p051_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -5. Energy transferred to x [PITH_FULL_IMAGE:figures/full_fig_p052_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -1. Artistic view of 2-LTD-brick x [PITH_FULL_IMAGE:figures/full_fig_p054_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -2. The drawing o [PITH_FULL_IMAGE:figures/full_fig_p055_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -3. The output cross- [PITH_FULL_IMAGE:figures/full_fig_p056_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -1. An unshielded Rogowski [PITH_FULL_IMAGE:figures/full_fig_p059_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -2. Rogowski co [PITH_FULL_IMAGE:figures/full_fig_p060_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -3. Oil filled cup (left) and CVR resistor (right). [PITH_FULL_IMAGE:figures/full_fig_p061_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -4 CVR and Rogowski-coil [PITH_FULL_IMAGE:figures/full_fig_p062_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -5. The calibration procedure was as follows. First, [PITH_FULL_IMAGE:figures/full_fig_p063_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -6 Rogowski coil calibra [PITH_FULL_IMAGE:figures/full_fig_p064_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -8 Rogowski and B-dot [PITH_FULL_IMAGE:figures/full_fig_p069_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -1. Revised 2-LTD-brick x [PITH_FULL_IMAGE:figures/full_fig_p071_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -2. Simulations of 2-LTD [PITH_FULL_IMAGE:figures/full_fig_p072_3.png] view at source ↗
Figure 3
Figure 3. Figure 3: -3. Simulations of 2-LTD [PITH_FULL_IMAGE:figures/full_fig_p074_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: -1. Common vs. separate charging line designs. Left s [PITH_FULL_IMAGE:figures/full_fig_p079_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -2. Shot № 101 (top) wit [PITH_FULL_IMAGE:figures/full_fig_p080_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -3. Shot № 202 (top) a [PITH_FULL_IMAGE:figures/full_fig_p082_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -4 shows our latest trigger box design with HV-100 pr [PITH_FULL_IMAGE:figures/full_fig_p083_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -5. Cracks developed in [PITH_FULL_IMAGE:figures/full_fig_p084_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -8. 2-LTD-Driver’s movement to a new location. [PITH_FULL_IMAGE:figures/full_fig_p085_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -1. 2-LTD-brick driver t [PITH_FULL_IMAGE:figures/full_fig_p087_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -2. Experimental curre [PITH_FULL_IMAGE:figures/full_fig_p088_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: -3. Short-circuit curre [PITH_FULL_IMAGE:figures/full_fig_p089_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: -1. X [PITH_FULL_IMAGE:figures/full_fig_p091_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -3. Double-shielde [PITH_FULL_IMAGE:figures/full_fig_p093_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -1. XRD bare quantum e [PITH_FULL_IMAGE:figures/full_fig_p096_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -2. XRD polished carbon fi [PITH_FULL_IMAGE:figures/full_fig_p097_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -1 shows data for two typical 2x80-μm Cu x [PITH_FULL_IMAGE:figures/full_fig_p098_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -2 presents two typical shots [PITH_FULL_IMAGE:figures/full_fig_p099_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -2. 2x80-μm (shot ID [PITH_FULL_IMAGE:figures/full_fig_p100_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -3. Shot ID 154 with 80-μm Cu x [PITH_FULL_IMAGE:figures/full_fig_p101_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -4 present [PITH_FULL_IMAGE:figures/full_fig_p102_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -4. 2x15-μm W x [PITH_FULL_IMAGE:figures/full_fig_p103_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -5. Shot ID 201 with 2x15-µm W x [PITH_FULL_IMAGE:figures/full_fig_p104_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -6. Shots with 4x15-µm W x [PITH_FULL_IMAGE:figures/full_fig_p105_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -1. 2x30-μm Cu x [PITH_FULL_IMAGE:figures/full_fig_p110_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -2), sometimes more co [PITH_FULL_IMAGE:figures/full_fig_p111_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -3 presents a few typi [PITH_FULL_IMAGE:figures/full_fig_p112_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -3. 2x30-μm W x [PITH_FULL_IMAGE:figures/full_fig_p113_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -4. 2x30-μm Mo x [PITH_FULL_IMAGE:figures/full_fig_p114_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -5 represents the timing performance for the differen [PITH_FULL_IMAGE:figures/full_fig_p115_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -5. Timing performance for 2x20-μm W, 2x30-μm Cu, 2x3 [PITH_FULL_IMAGE:figures/full_fig_p116_5.png] view at source ↗
Figure 5
Figure 5. Figure 5: -1. The minimum radia [PITH_FULL_IMAGE:figures/full_fig_p119_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: -1. The objects, which can be a pinhole camera, a ste [PITH_FULL_IMAGE:figures/full_fig_p122_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -1. Source-object-plate [PITH_FULL_IMAGE:figures/full_fig_p123_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -2. Finite-size pinhol [PITH_FULL_IMAGE:figures/full_fig_p124_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -3. 2x30-μm W x [PITH_FULL_IMAGE:figures/full_fig_p125_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -5 shows a 220-μm-diameter [PITH_FULL_IMAGE:figures/full_fig_p126_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -7 shows exactly the same 220-μm-diameter pinhole cam [PITH_FULL_IMAGE:figures/full_fig_p127_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -7. A 220-µm-diameter pi [PITH_FULL_IMAGE:figures/full_fig_p128_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -8. A time-integrate [PITH_FULL_IMAGE:figures/full_fig_p129_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -1 presents a typical step-wedge image obtained from [PITH_FULL_IMAGE:figures/full_fig_p130_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -2. Al step-we [PITH_FULL_IMAGE:figures/full_fig_p131_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -4 presents the density profile data for shot ID 653 [PITH_FULL_IMAGE:figures/full_fig_p132_6.png] view at source ↗
Figure 6
Figure 6. Figure 6: -4. Density profile s [PITH_FULL_IMAGE:figures/full_fig_p133_6.png] view at source ↗
read the original abstract

Almost all well-known x-pinch x-ray radiation machines are large, based on a conventional Marx generator, and lack portability. The literature suggests that a current rate of rise of 1 kA/ns or more is required for "good" x-pinch radiation performance, which, for reasonable current rise times, translates to a current requirement of 100 kA or more. Those requirements are difficult to achieve in a limited volume, if one wants to build a compact machine without the use of traditional Marx generators, pulse-forming lines, and transmission lines. In this work we describe a new, compact and portable x-pinch driver based on two "slow" LTD bricks combined into one solid unit. The short-circuit tests demonstrated the required 1-kA/ns current rate-of-rise and x-pinch shots confirmed "good" x-pinch radiation performance and revealed the potential for many x-pinch applications.

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 / 0 minor

Summary. The manuscript presents the design and testing of a compact, portable x-pinch radiation source constructed from two slow LTD bricks integrated into a single unit. It claims that short-circuit tests achieved the literature benchmark of 1 kA/ns current rate-of-rise, while subsequent x-pinch wire shots produced good radiation performance, demonstrating the feasibility of such a driver without conventional Marx generators, pulse-forming lines, or transmission lines.

Significance. If the performance under load is confirmed, the result would provide a genuinely compact and portable alternative to large-scale x-pinch drivers, lowering the barrier for x-pinch applications in radiation-source research. The experimental demonstration against an external 1 kA/ns benchmark is a strength.

major comments (1)
  1. [Results / x-pinch shots section] The central engineering claim requires that the 2-LTD-brick assembly deliver ≥1 kA/ns under x-pinch load conditions (higher inductance and time-varying resistance). The abstract and results rest this on short-circuit tests alone; no section provides overlaid current traces, tabulated peak dI/dt values, or direct comparison between short-circuit and x-pinch shots. This leaves the translation from unloaded to loaded performance unverified.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their positive evaluation of the work's significance and for the constructive major comment. We respond point-by-point below.

read point-by-point responses
  1. Referee: [Results / x-pinch shots section] The central engineering claim requires that the 2-LTD-brick assembly deliver ≥1 kA/ns under x-pinch load conditions (higher inductance and time-varying resistance). The abstract and results rest this on short-circuit tests alone; no section provides overlaid current traces, tabulated peak dI/dt values, or direct comparison between short-circuit and x-pinch shots. This leaves the translation from unloaded to loaded performance unverified.

    Authors: We agree that the manuscript reports the ≥1 kA/ns rate exclusively from short-circuit tests and provides no overlaid traces, tabulated dI/dt values, or direct comparison under x-pinch load. The x-pinch results are presented only in terms of radiation output. Because current diagnostics were not recorded during the loaded shots, we cannot supply the requested data. We will revise the abstract, results, and discussion sections to explicitly distinguish the short-circuit benchmark from the loaded performance and to note that the radiation results serve as indirect evidence of adequate drive under load without a quantified dI/dt value for that case. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental results benchmarked externally

full rationale

This is an experimental engineering paper reporting measured performance of a compact LTD-based x-pinch driver. Claims rest on short-circuit dI/dt measurements and x-pinch shot outcomes compared to external literature requirements (1 kA/ns), with no equations, derivations, fitted parameters presented as predictions, or self-citations that reduce any result to its own inputs. The derivation chain is absent; performance is demonstrated against independent benchmarks rather than constructed by definition or self-reference.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The paper is an experimental device report. The central claim rests on the domain assumption that 1 kA/ns is required for good performance and on the engineering premise that two slow LTD bricks suffice; no free parameters or invented entities appear in the abstract.

axioms (1)
  • domain assumption A current rate of rise of 1 kA/ns or more is required for good x-pinch radiation performance
    Explicitly stated as the literature benchmark that the new driver must meet.

pith-pipeline@v0.9.0 · 5690 in / 1243 out tokens · 38629 ms · 2026-05-24T22:29:11.148894+00:00 · methodology

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Reference graph

Works this paper leans on

82 extracted references · 82 canonical work pages

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