Instrumentation for status monitoring and protection of SST-1 superconducting magnets

Sharma, A.N.; Prasad, Upendra; Doshi, K.; Varmora, P.; Khristi, Y.; Patel, Dipak; Pradhan, Subrata

doi:10.1016/j.fusengdes.2016.05.006

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Under cryogenic temperatures and magnetic elds, the strain measurements of superconducting magnets are generally performed using half-active or full-active bridge con gurations, which have been described in detail in previous studies [14][15][16][17][18][19]. A half-active bridge compensation con guration can theoretically eliminate measurement errors that occur due to a large temperature gradient and magnetoresistance effect by an equal and opposite gauge response.…”

Section: Technique Principlementioning

confidence: 99%

“…Therefore, monitoring simultaneous mechanical strain under extreme cryogenic multi eld conditions is both necessary and challenging. In such scenarios, strain is typically measured using low-temperature resistance strain gauges with temperatures ranging from room temperature (RT, ~293 K) to that of liquid helium (LHe, ~4.2 K) in several superconducting instruments [11][12][13][14][15][16][17][18][19][20]. However, cryogenics always causes a great drift thermal offset to the measurement, and the magnetic eld around the strain gauge can easily result in a magneto-resistance error [13].…”

Section: Introductionmentioning

confidence: 99%

“…However, cryogenics always causes a great drift thermal offset to the measurement, and the magnetic eld around the strain gauge can easily result in a magneto-resistance error [13]. Thus, a few bridge compensation technologies have been developed and effectively extended to strain measurements under noisy environments and spatial constraints [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Following these techniques, strain measurements have been performed on several types of superconducting magnets, such as the superconducting toroidal eld and poloidal eld coils in the International Thermonuclear Experimental Reactor [14], coil system and neighbouring components in the W7-X device [15], magnets in large helical devices [16,17], accelerator magnets in the Facility for Rare Isotope Beams [18], and some high-eld high-temperature superconducting (HTS) coils [19,20].…”

Section: Introductionmentioning

confidence: 99%

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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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