Development of a Cryogenic Calorimeter for Investigating Beam-Based Heat Load of Superconducting Undulators

Cui, Jian; Xu, Jie; Li, W.; Li, M.; Zhang, Z. C.; Ji, X. K.; Prestemon, S.; Koettig, T.; Schlueter, R.; Zhang, P.; Cheng, Yu Tsun

doi:10.1109/tasc.2013.2293337

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…While the LBNL-SINAP calorimeter will allow beam heat load measurements at different gaps, the COLDDIAG has one cold and two warm sections, and it is equipped with additional diagnostics such as retarding field analyzers, pressure gauges, and mass spectrometers to shed light on the eventual role played by the cryogenic layer in the beam heating mechanism. The LBNL-SINAP calorimeter is installed in the Shanghai Light Source [14].…”

Section: Introductionmentioning

confidence: 99%

Cold vacuum chamber for diagnostics: Instrumentation and first results

Gerstl

Voutta

Casalbuoni

et al. 2014

Phys. Rev. ST Accel. Beams

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For a proper design of the cryogenic layout of superconducting insertion devices it is necessary to take into account the heat load from the beam to the cold beam tube. In order to measure and possibly understand the beam heat load to a cold bore, a cold vacuum chamber for diagnostics (COLDDIAG) has been built. COLDDIAG is designed in a flexible way, to allow its installation in different light sources. In order to study the beam heat load and the influence of the cryosorbed gas layer, the instrumentation comprises temperature sensors, pressure gauges, and mass spectrometers as well as retarding field analyzers with which it is possible to measure the beam heat load, total pressure, and gas content as well as the flux of particles hitting the chamber walls. In this paper we describe the experimental equipment, the installation of COLDDIAG in the Diamond Light Source and selected examples of the measurements performed to show the capabilities of this unique instrument.

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Section: Introductionmentioning

confidence: 99%

Cold vacuum chamber for diagnostics: Instrumentation and first results

Gerstl

Voutta

Casalbuoni

et al. 2014

Phys. Rev. ST Accel. Beams

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“…As shown in Figure 9, the DC power supply [29] is composed of three parts. The first part outputs DC power using two AC power sources with different voltage input sand a rectifier.…”

Section: Control Principle Of the DC Power Supplymentioning

confidence: 99%

Three-Phase Saturated-Core Fault Current Limiter

et al. 2018

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The saturated-core fault current limiter (SFCL) is widely used to limit the fault current. However, in the conventional SFCL structure, alternating current (AC) and direct current (DC) coils are wound on different loosely coupled cores. Owing to the leakage inductance, the traditional structure demonstrates relatively large demand for DC excitation power and excessive impedance during saturation. In this study, a new structure for winding closely coupled DC and AC coils on the same core in three phases is proposed to reduce the influence of leakage reactance on the SFCL performance. The leakage magnetic flux generated by both structures is analyzed by performing finite element analysis simulations and utilizing a magnetic field division method. The impedance of the limiter is measured at different DC currents and air gaps to optimize its dynamic performance. A fabricated prototype of the proposed limiter exhibits smaller steady-state losses and high current-limiting capability.

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