Field Measurements of Magnets for Modern SR Sources and FEL
Magnets for modern accelerators and storage rings may have a rather complex field distribution and strict quality requirements. The Budker Institute of Nuclear Physics (Novosibirsk, Russia) is a well-known producer of magnets for various accelerator projects worldwide. This paper describes our magnet measurement facility with examples of NSLS-II booster magnets, small-aperture X-FEL quadrupoles, and PETRA-III dipoles. NSLS-II booster dipoles have quadrupole and sextupole components with a rather high field quality of 1 · 10-3 in the good field region of ±2 cm, providing booster operation at energy from 170 MeV to 3.15 GeV with a 2-Hz repetition rate. We designed a special bench with a ceramic rotation coil to measure X-FEL quadrupoles. The equipment provided measurements of the magnetic axis with accuracy better than 5 μm. We used the system of three temperature-stabilized Hall sensor arrays distributed vertically to obtain a three-dimensional field map from a single measurement of PETRA-III dipole magnets.
X-FEL Quadrupole with Gradient of 100 T/m
Abstract The paper describes an XFEL quadrupole with a gradient of 100 T/m. The magnets of this quadrupole are designed for installation in the free space between the XFEL undulators to maintain the high quality of the electron beam at an energy of 10 - 20 GeV, which requires high stability of the magnetic axis of the lens. The available size of the aperture of the lens is R = 8 mm. The stability of the quadrupole magnetic axis is better than 5 um for ±10% of the gradient range; the magnetic field quality is good (ΔВ/В
BENDING MAGNETS FOR THE SAGA STORAGE RING: MANUFACTURING AND MAGNETIC MEASUREMENTS
The creation of BM with that large good field area is complicated due to necessity to combine it with small transverse dimensions of BM, indicated in Fig.1. Before a serial production the prototype (BM00) of the bending magnet was designed, manufactured and measured by the Budker INP and in KHI, Japan. On the basis of this prototype the 16 serial bending magnets were manufactured and delivered to Saga SR Source. The paper describes the design, the manufacture and the magnetic measurements of the dipole bending magnets (BMs) for SR Source Storage Ring (SAGA prefecture, Japan) carried out in BINP, Novosibirsk, Russia.