Explanipedia

Modelling very recent ice ages on Mars with the Planetary Climate Model Open

F. Forget, N. Joseph, Vos Eran, Lucas Lange, Jean-Baptiste Clément , et al. · 2025

Protected by centimeters of dry sediments, a planetary-scale mantle of relatively pure water ice covers the entire mid and high latitudes of Mars. Its presence down has been shown by numerous lines of evidence including geomorphology [e.g.…

Technological developments and accelerator improvements for the FRIB beam power ramp-up Open

Junhao Wei, C. Alleman, Hiroyuki Ao, B. Arend, Douglas F. Barofsky , et al. · 2024

The Facility for Rare Isotope Beams (FRIB) began operation with 1 kW beam power for scientific users in May 2022 upon completion of 8 years of project construction. The ramp-up to the ultimate beam power of 400 kW, planned over a 6-year pe…

Design, fabrication, and installation of the cryogenic distribution system for FRIB target and fragment pre-separator superconducting magnets Open

Nusair Hasan, M Wright, V. Ganni, F. Casagrande, Shelly Jones , et al. · 2022

The target and fragment pre-separator segment of the continuous wave heavy ion beam linear accelerator at FRIB consists of fourteen superconducting magnets. The cryogenic distribution system for these superconducting magnets include six cr…

Accelerator commissioning and rare isotope identification at the Facility for Rare Isotope Beams Open

J. Wei, Hiroyuki Ao, B. Arend, Steven Beher, G. Bollen , et al. · 2022

In 2008, Michigan State University was selected to establish the Facility for Rare Isotope Beams (FRIB). Construction of the FRIB accelerator was completed in January 2022. Phased accelerator commissioning with heavy ion beams started in 2…

Design and Performance of the Solid-State Laser Trigger System for HERMES III Open

C. Grabowski, N. Joseph, S.K. Coffey, Ben Richard Hughes, G. Tilley , et al. · 2020

The HERMES III accelerator is an 18-20 MeV linear induction accelerator constructed at Sandia National Laboratories in the late 1980s and which continues operation to this day. As part of recent modernization efforts, the laser triggering …

FRIB helium refrigeration system commissioning and performance test results Open

P. Knudsen, V. Ganni, Nusair Hasan, M Wright, F. Casagrande , et al. · 2020

At its maximum capacity condition, the 4.5 K refrigerator system for the Facility for Rare Isotope Beams (FRIB) accelerator supports a 180 g/s 30 K 1.16 bar cold compressor return flow, a 14 g/s 4.5 K liquefaction load, a 4 kW 4.5 K refrig…

Design, fabrication, commissioning and testing of FRIB 2 K cold compressor system Open

P. Knudsen, V. Ganni, F. Casagrande, Adam Fila, Nusair Hasan , et al. · 2020

The FRIB cryogenic engineering group designed and built the sub-atmospheric cold box which supports the 2 K (31 mbar) operation of the FRIB accelerator cryo-modules. The centrifugal cryogenic (cold) compressors, designed with room temperat…

FRIB cryogenic control system Open

N. Joseph, Geovanna Marilin Balladares Vargas, S. Stanley, Christie Dudley, Michael Thrush , et al. · 2020

The cryogenic system at the Facility for Rare Isotope Beams (FRIB) supports loads for 2 K refrigeration, 4.5 K refrigeration and liquefaction, and a 35-55 K thermal shield for the linear accelerator consisting of 46 cryomodules, 4 supercon…

FRIB cryogenic system status Open

F. Casagrande, V. Ganni, P. Knudsen, M Wright, Shelly Jones , et al. · 2020

The Facility for Rare Isotope Beams (FRIB) cryogenic plant has been successfully commissioned, including compressor system, 4.5 K cold box system, sub-atmospheric (2 K) cold box system, and the distribution system for two of the three line…

FRIB helium compression system commissioning and performance test results Open

P. Knudsen, V. Ganni, M Wright, F. Casagrande, Gerardo Vargas , et al. · 2020

The design for the FRIB helium compressor system, used for the cryogenic refrigeration, was mainly based on the advancements developed for NASA James Webb project, improving the efficiency, reliability and maintainability from previous hel…

Modernization of the Marx and Rimfire Triggering Systems for the HERMES-III Accelerator Open

C. Grabowski, N. Joseph, S.K. Coffey, G. Archuleta, E Gutiérrez , et al. · 2019

HERMES III is a 20-MeV linear induction accelerator that was constructed at Sandia National Laboratories in the late 1980's and continues operation to this day. The accelerator utilizes 10 Marx banks for its initial energy storage and puls…

Electro-Optical Measurement of Electric Fields for Pulsed Power Systems Open

Israel Owens, C. Grabowski, N. Joseph, S.K. Coffey, Benjamin Ulmen , et al. · 2019

The electric field strength between the cathode and anode (i.e., the voltage) of a pulsed power machine is one of the most important operating parameters of the device. However, to date, accurate and precise voltage measurements on these h…

Considerations for improvements to the 25 TW Saturn high-current driver Open

M. E. Savage, Kevin Austin, S.K. Coffey, Peter A. Jones, N. Joseph , et al. · 2019

The Saturn X-ray generator is a 2.5 megavolt, 10 megampere electrical driver at Sandia National Laboratories. Saturn has been in operation for more than 30 years. Work is underway to identify key areas of the machine, improvement of which …

FRIB cryogenic system status Open

F. Casagrande, V. Ganni, P. Knudsen, Shelly Jones, A. Sidi‐Yekhlef , et al. · 2017

Construction and installation of the FRIB 4.5 K helium refrigeration system is nearing completion, with compressor system commissioning and 4.5 K refrigerator commissioning on schedule to occur in late 2017. The LINAC 4.5 K helium distribu…

Solid state laser triggering system for the Hermes-III accelerator Open

B. Grabowski, N. Joseph, S.K. Coffey, Ben Hughes, Barbara Lewis , et al. · 2017

The Hermes III accelerator at Sandia National Laboratories is a 20-cavity multi-stage linear induction voltage accelerator typically producing a 20-MV, 40-ns, 600-kA output pulse. Energy is initially stored in Marx banks that are each disc…

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