Superconducting Wigglers

Abstract

IntroductionIn low-and medium-energy storage rings for synchrotron radiation (SR) production, it is necessary to use high-performance insertion devices (IDs) in order to meet the increasing demand for high X-ray flux to perform life science and material science, since the maximum beam energy and beam current cannot be changed in storage rings without major rebuilds of the accelerator systems.Superconducting (SC) wigglers (SCWs) are high-performance IDs suitable for extending the spectral range of SR storage rings towards shorter wavelengths and harder X-rays. The SCWs can be either wave length shifters (WLS) with a few magnet poles with very high magnetic field or multipole wigglers (MPW) with a large number of poles with

Complex bend: Strong-focusing magnet for low-emittance synchrotrons

“…As we at NSLS-II are in the process of constructing a high-energy x-ray beam line, we will be using a superconducting wiggler (SCW) with a 4.5 T peak dipole field on axis, a vertical aperture of 1 cm, and a period length of 5 cm [10]. The technology for developing compact poles of SCWs with high field exists today and has reached a high degree of maturity [11].…”

Cold vacuum chamber for diagnostics: Analysis of the measurements at the Diamond Light Source and impedance bench measurements

“…The beam heat load is needed for designing the cooling system of SCIDs. All SCIDs installed in different synchrotron light sources show a beam heat load higher than the one expected [1][2][3][4][5]. A cold vacuum chamber equipped with different diagnostics (COLDDIAG) has been developed to measure and possibly understand the beam heat load to a cold bore.…”

Design and system integration of the superconducting wiggler magnets for the Compact Linear Collider damping rings

“…Therefore, the average power deposition per unit length due to the wakefield of the beam in the extreme anomalous skin effect regime of a cold beam pipe for aluminum or copper (coating) is given by [26] P=L ¼ Àð 5 6 ÞcZ 0 4b 2…”

“…Since the liquid helium flows through the center of the coils, the existing coils act as a rigid mechanical barrier between the vacuum and the liquid helium. Therefore, no additional pressure barrier between coils and beam vacuum as in standard wiggler magnets with bath cooling (summarized in [5]) is needed to ensure that the beam pipe is not plastically deformed in the case of quench due to the mechanical load of the pressure increase caused by the vaporizing helium (usually up to 10 6 Pa). Therefore, the wiggler magnet with the proposed cooling system can be operated with the same beam stay clear but at a smaller pole distance resulting in a considerably larger magnetic field compared to bath cooled magnets because of the nonlinear magnetic flux density to gap relation given in Eq.…”