In order to meet the requirement for rapid switching between left- and right-handed circularly polarized light, we have designed and constructed an undulator incorporating a combination of permanent magnets and electromagnets. The 0.5-meter-long prototype undulator generates a horizontal magnetic field through four rows of permanent magnets, each with adjustable horizontal gaps, while the...
The Shanghai Synchrotron Radiation Facility (SSRF) insertion device team is developing several 4.2-meter-long elliptically polarized undulators (EPU) for the Hefei Advanced Light Facility (HALF). Magnet keepers are directly installed onto the sliding girders, rather than utilizing traditional pre-assembled subassemblies, to ensure precise positioning of the magnets in the beam direction. We...
This paper presents the development of a cryogen-free 2G High-Temperature Superconducting (HTS) wiggler for use at the National Synchrotron Radiation Research Center (NSRRC). The proposed design leverages the advanced properties of 2G-HTS materials to provide magnetic fields around 2.7 T. The wiggler utilizes modified double pancake winding techniques for the HTS coils. This method doesn't...
Precise magnetic field measurement of undulators is a cornerstone in optimizing synchrotron radiation facilities. This study introduces a position-sensitive Detector (PSD)-based system aimed at enhancing the accuracy of point measurements using Hall probes. By focusing on the challenges of positional deviation and misalignment, the system improves the precision of magnetic field data critical...
Compared to the conventional temperature oscillator, CPMU enhances the peak magnetic field of the oscillator. However, due to limitations in its design structure, a visual high-precision magnetic measurement based on C# is developed for vacuum-based magnetic field testing and correction. The measurement system comprises a Hall probe, a vacuum translation motor, a laser interferometer optical...
The bulk high-temperature superconducting (HTS) undulator constructed from RE-Ba-Cu-O (REBCO) bulks demonstrates the capability to generate an undulator field up to 2.1 T of 10 mm period [1]. This performance exceeds that of the current state-of-the-art permanent magnet and low-temperature superconducting undulators [2]. Compared to REBCO bulks, the alternative MgB2 bulk superconductors...
