Development and magnetic field measurement of a 0.5-m-long superconducting undulator at IHEP

Wei, Junhao; Li, Yuhui; Yang, Xiangchen; Chen, Zilin; Zhang, Xiangzhen; Bian, Xiaojuan

doi:10.1107/s1600577522006166

Cited by 7 publications

(3 citation statements)

References 9 publications

(7 reference statements)

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“…The height of the magnet poles for each iron yoke was measured using a three-coordinate measuring instrument, which was then assembled together as a 0.5-m-long SCU. The pole height RMS error was 25 μm for the first magnet yoke and 9.8 μm for the second magnet yoke [15]. Due to the poor manufacturing accuracy, the first magnet yoke had bad pole height consistency.…”

Section: 5-m-long Scumentioning

confidence: 99%

Development of NbTi planar superconducting undulators at the IHEP

et al. 2023

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Superconducting undulators (SCUs) have the advantages of generating stronger magnetic field and the radiation hardness compared to permanent magnet undulators. Therefore, SCUs are valuable to be applied in the free-electron lasers (FELs) driven by high-repetition-rate linear accelerators. The Insertion Device Group at the Institute of High Energy Physics (IHEP) in China started an R&D project to produce NbTi planar SCU prototypes with 15 mm period length. Several SCU prototypes, including short mock-ups, a 0.5-m-long SCU, and a 1.5-m-long SCU, have been successfully produced and cryogenic tested. The short mock-up coils were cooled by a liquid helium free cryostat to be quench trained at 4 K. The maximum current in the coils reached 500 A and the magnetic peak field exceed 1 T with 7 mm gap. The 0.5-m-long SCU was tested by using a vertical test system. The correction coils were confirmed with the ability in both correcting the magnetic field integrals and the phase error. The 1.5-m-long SCU was not only vertically tested, but also installed in a cryostat to be operated with high current over a long time. We applied the gap adjustment method to reduce the phase error within 9 degrees. The development of SCUs at the IHEP is introduced in this paper in detail.

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Section: 5-m-long Scumentioning

confidence: 99%

Development of NbTi planar superconducting undulators at the IHEP

et al. 2023

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“…This specific application demands probes with a compact diameter ranging from 3.0 mm to 5.0 mm, spatial resolution of 500 µm or less, and a wide magnetic field range, capable of measuring up to 3T, all while maintaining a magnetic sensitivity of 25 µT and an accuracy of 1000 ppm for the stated range. Additionally, it is crucial for the probe to swiftly traverse through undulators, allowing for rapid characterization with a targeted minimum linear speed of 10 mm/s with 40 measurements per second [13][14][15][16].…”

Section: Performance and Optimizationmentioning

confidence: 99%

Digital Miniature Cathode Ray Magnetometer

Turqueti,

Wagner,

Goldschmidt

et al. 2024

Instruments

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In this study, we introduce the concept and construction of an innovative Digital Miniature Cathode Ray Magnetometer designed for the precise detection of magnetic fields. This device addresses several limitations inherent to magnetic probes such as D.C. offset, nonlinearity, temperature drift, sensor aging, and the need for frequent recalibration, while capable of operating in a wide range of magnetic fields. The core principle of this device involves the utilization of a charged particle beam as the sensitivity medium. The system leverages the interaction of an electron beam with a scintillator material, which then emits visible light that is captured by an imager. The emitted scintillation light is captured by a CMOS sensor. This sensor not only records the scintillation light but also accurately determines the position of the electron beam, providing invaluable spatial information crucial for magnetic field mapping. The key innovation lies in the combination of electron beam projection, CMOS imager scintillation-based detection, and digital image signal processing. By employing this synergy, the magnetometer achieves remarkable accuracy, sensitivity and dynamic range. The precise position registration enabled by the CMOS sensor further enhances the device’s utility in capturing complex magnetic field patterns, allowing for 2D field mapping. In this work, the optimization of the probe’s performance is tailored for applications related to the characterization of insertion devices in light sources, including undulators.

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“…This specific application demands probes with a compact diameter ranging from 3mm to 5mm, spatial resolution of 500μm or less, and a wide magnetic field range, capable of measuring up to 3 T, all while maintaining a magnetic sensitivity of 25μT. Additionally, it is crucial for the probe to swiftly traverse through undulators, allowing for rapid characterization with a targeted minimum linear speed of 10mm/s with 40 measurement per second [12][13][14][15].…”

Section: Performance and Optimizationmentioning

confidence: 99%

Digital Miniature Cathode Ray Magnetometer

Turqueti,

Wagner,

Goldschmidt

et al. 2024

Preprint

View full text Add to dashboard Cite

In this study, we introduce the concept and construction of an innovative Digital Miniature Cathode Ray Magnetometer designed for the precise detection of magnetic fields. This device addresses several limitations inherent to magnetic probes such as D.C. offset, nonlinearity, temperature drift, sensor aging, and the need for frequent recalibration, while capable of oper-ating in a wide range of magnetic fields. The core principle of this device involves the utilization of a charged particle beam as the sensitivity medium. The system leverages the interaction of an electron beam with a scintillator material, which, then, emits visible light that is captured by an imager. The emitted scintillation light is captured by a CMOS sensor. This sensor not only rec-ords the scintillation light but also accurately determines the position of the electron beam, providing invaluable spatial information crucial for magnetic field mapping. The key innova-tion lies in the combination of electron beam projection, CMOS imager scintillation-based de-tection and digital image signal processing. By employing this synergy, the magnetometer achieves remarkable accuracy, sensitivity and dynamic range. The precise position registration enabled by the CMOS sensor further enhances the device's utility in capturing complex magnetic field patterns, allowing for 2D field mapping. In this work, the optimization of the probe's per-formance is tailored for applications related to the characterization of insertion devices in light sources, including undulators.

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Development and magnetic field measurement of a 0.5-m-long superconducting undulator at IHEP

Cited by 7 publications

References 9 publications

Development of NbTi planar superconducting undulators at the IHEP

Development of NbTi planar superconducting undulators at the IHEP

Digital Miniature Cathode Ray Magnetometer

Digital Miniature Cathode Ray Magnetometer

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