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All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Spot Size Optimization of the Scorpius Accelerator

The Scorpius Linear Induction Accelerator (LIA) is being developed by the Advanced Sources and Diagnostics (ASD) Project and will complement other U1a capabilities by providing a multi-pulse, DARHT-class, flash-radiography capability. Commissioning activities are expected to end in Spring of 2026. All of the diagnostics discussed in this chapter are relevant to LIAs that generate high-current relativistic electron beams, and some diagnostics will also be relevant to other accelerators. The Scorpius Accelerator will be the world’s most advance LIA. Although significant technological advancements have been incorporated throughout the machine, many performance aspects of Scorpius will be similar to those of FXR and DARHT Axis-I and -II. These LIAs offer the same challenges, whether it is suppressing beam instabilities, improving diagnostic accuracy, validating computer simulations and beam tunes, or reducing beam-target interaction effects. However, the ultimate figure of merit is consistent between these LIAs, which is spot size and dose.

43 PARTICLE ACCELERATORS↗
DOE OSTI2022

The Scorpius Accelerator and the NNSS [Slides]

Scorpius is an electron accelerator designed to take x-ray images of weapon components (Flash Radiography). The final design was completed in January 2022. The accelerator start-up will begin in 2025. The Weapons Labs and NNSS are building the Scorpius Accelerator. The NNSS will commission, operate, maintain and upgrade Scorpius.

43 PARTICLE ACCELERATORS↗
DOE OSTI2023

Scorpius Accelerator Emittance Diagnostic Design

The 14th International Particle Accelerator Conference (IPAC’23) will be held in Venice, Italy from 7 to 12 May 2023 at the Venice Convention Centre. Website: https://www.ipac23.org/ Presenter: Mark Raphaelian Dear Mark, we acknowledge reception of your abstract #1268 for IPAC'23 - 14th International Particle Accelerator Conference. Here follow the details: Title: The Design of the Emittance Diagnostic for the Scorpius Accelerator Classification: MC6.T03: Beam Diagnostics and Instrumentation Type of presentation: Poster Presentation Submitter: Mark Raphaelian Authors: Mark Raphaelian Co-Authors: Daniel Dzenitis, Franz Weber, Nathaniel Pogue, Sean Littleton, Steven Falabella, Patrick Duffy, William Stem

47 OTHER INSTRUMENTATION↗
DOE OSTI2023

Design Aspects of the Emittance Diagnostic for the Scorpius Accelerator

Dear author, This is a reminder that we are expecting you to resubmit your IPAC'23 paper 1268 at https://indico.jacow.org/event/41/papers/2549/ in a format compliant with the IoP guidelines posted at https://publishingsupport.iopscience.iop.org/author-guidelines-for-conference-proceedings/ Could you please upload your paper as a PDF file in the IoP format at https://indico.jacow.org/event/41/papers/2549/ Title: The Design of the Emittance Diagnostic for the Scorpius Accelerator id: 1268 The deadline for resubmitting your paper is July 1st 2023 but we would appreciate if you could submit it earlier. Thank you in advance, Nicolas Delerue on behalf of the IPAC'23 LPR SPB

43 PARTICLE ACCELERATORS↗
DOE OSTI2022

Prospects for Machine Learning and Pulse Shaping on the Scorpius Accelerator [Poster]

The Advanced Sources and Detectors (ASD) project aims to build Scorpius, a multi pulse linear induction accelerator capable of delivering a 1.4 kA electron beam at energies up to 24 MeV. One of the primary advancements of Scorpius is the use of solid state pulsed power (SSPP) to provide flexibility in pulse shaping by independently triggering 45 individual stages stacked in each of 984 line replaceable units (LRU), with 168 LRUs dedicated to the injector. By leveraging circuit modeling of each LRU stage, a machine learning model of the SSPP will be developed to allow for optimization of the pulse shape, including pulse flattening and reflection mitigation. Particle-in-cell simulations of Scorpius have, for example, demonstrated that reducing reflections during multi-pulse operation mitigates beam spill by preventing the production of off-energy electrons between pulses, thereby abating stimulated ion desorption from the wall and beam charge neutralization. This machine learning model will be validated and tuned with experimental data collected from the Scorpius injector and Integrated Test Stand

43 PARTICLE ACCELERATORS↗
DOE OSTI2021

Electron-Beam Corkscrew Motion in an Advanced Linear Induction Accelerator

Scorpius is a multipulse linear induction accelerator (LIA) under development for flash radiography. Because it has substantially more cells than present LIAs, higher magnetic focusing fields are needed to suppress beam breakup (BBU). Therefore, it is more susceptible to corkscrew motion of the beam, which also depends on beam energy spread and focusing magnet misalignments. For energy spread and alignment tolerances expected for Scorpius, a magnetic tune designed to suppress BBU is shown to produce corkscrew motion within the range that can be controlled through the use of steering dipoles on existing LIAs. Finally, a gap-voltage modulation scheme is shown to almost completely eliminate chromatic effects such as corkscrew.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
DOE OSTI2022

An Electron-Beam Ion-Neutralization Diagnostic for the Scorpius Radiography Accelerator

Electron beam spilling onto the beam pipe can produce positive ions that are accelerated inward into the beam body by its space charge. These ions partially neutralize the space charge, thereby causing the beam to be mismatched to the magnetic fields used for transport. A diagnostic of neutralization effects has been used on present accelerators, and in this note the feasibility of its use on a future accelerator is assessed.

43 PARTICLE ACCELERATORS↗
DOE OSTI2021

Beam Position Monitor: Sensors, Calibration and Analysis [Slides]

A beam position monitor (BPM) provides information on electron beam current and position, essential to meeting the performance requirements for the Scorpius accelerator as laid down in FR1.1 –FR1.8 and FR2.2. The critical elements in employing BPM’s to meet those requirements are design of the sensor, design of calibration equipment for the sensor, and design of methods to record and process data.

43 PARTICLE ACCELERATORS↗