Mechanical Study of a Superconducting 28-GHz Ion Source Magnet for FRIB

Pan, Heng; Arbelaez, Diego; Félice, H.; Hafalia, A.R.; Lipton, Thomas; Myers, Scott A.; Machicoane, G.; Omelayenko, Mykola; Prestemon, S.; Pozdeyev, E.; Rochepault, Etienne; Rao, Xing

doi:10.1109/tasc.2019.2901589

Cited by 6 publications

(1 citation statement)

References 8 publications

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“…1. The examples of existing facilities using this type of a magnet is LBNL VENUS [1] and MSU FRIB [2] while IMP FECR magnet [3] is currently being developed. This coil configuration requires fairly large solenoid coils for generating a required axial field confinement.…”

Section: A Sextupole In Solenoidsmentioning

confidence: 99%

Shell-Based Support Structure for the 45 GHz ECR Ion Source MARS-D

Juchno

Benitez

Doyle

et al. 2022

IEEE Trans. Appl. Supercond.

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Superconducting electron cyclotron resonance ion sources (ECRISs) using NbTi coils and optimized for 28 GHz resonant heating have been successfully operated for almost two decades. Moving to higher heating frequencies requires increased magnetic fields, but traditional racetrack-and-solenoid ECRIS structures are at their limit using NbTi. Rather than moving to a superconductor untested in this field, the Mixed Axial and Radial field System (MARS) being developed at Lawrence Berkeley National Laboratory employs a novel closed-loop-coil design that more efficiently utilizes conductor fields and will allow the use of NbTi in a next-generation, 45 GHz ECRIS. This article presents the design of the shell-based support structure central to the MARS-D magnet design, as well as structural analysis of its components and optimization of pre-load parameters that will guarantee its successful operation.

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Section: A Sextupole In Solenoidsmentioning

confidence: 99%

Shell-Based Support Structure for the 45 GHz ECR Ion Source MARS-D

Juchno

Benitez

Doyle

et al. 2022

IEEE Trans. Appl. Supercond.

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Strain Measurement Method Based on External Symmetrical Compensation Bridge Composed of Strain Gauges with Four-Wire Configuration for a Large-Scale NbTi Superconducting Dipole Magnet Detector

Zhang,

Xin,

Gao

et al. 2023

J Low Temp Phys

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In this study, we present a strain measurement method based on an external symmetrical compensation bridge (ESCB) composed of strain gauges with a four-wire con guration. Unlike the traditional strain measurement methods, this method includes two features: rst, utilising the four-wire con guration to eliminate measurement errors that occur due to large space-varying thermal and eld imbalances of long signal wires during operation, and second, utilising two independent quarter-active sub-bridges with a four-wire con guration composed of ESCB to eliminate the errors that occur due to the large time-varying cryogenic temperature and magnetic eld. This method was used on a large-scale NbTi superconducting dipole magnet detector during the cooling, excitation, and quench tests. The strains measured using the ESCB were compared with those measured using a traditional half-active compensation bridge. The results indicated that the new method can accurately detect the strain features of a large-scale superconducting magnet. In addition, using the proposed method, spectrum analysis of strain measurements was implemented during excitation, quench onset, and post-quench. A larger amplitude at a higher frequency was clearly observed at the onset of a quench than that observed during excitation and post-quench. Thus, the dynamic strain characteristics of a superconducting magnet structure could be a candidate for predicting the quench.

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