Magnetic field reconstruction using the pulsed wire method: An accuracy analysis

Geloni

et al. 2022

We propose to develop, characterize and operate a superconducting undulator (SCU) afterburner consisting of 5 undulator modules (1 module = 2 SCU coils of 2 m length and 1 phase shifter) plus a pre-series prototype at the SASE2 hard X-ray beamline of European XFEL. This afterburner will produce an output in the order of 1010 ph/pulse at photon energies above 30 keV. The project is divided into the production of a pre-series prototype module and a small-series production of 5 modules. Central goals of this R&D activity are: the demonstration of the functionality of SCUs at an X-ray FEL, the set up of the needed infrastructure to characterize and operate SCUs, the industrialization of such undulators, and the reduction of the price per module. In this contribution, the main parameters and specifications of the pre-series prototype module are described.

Section: Superconducting Undulator Afterburnermentioning

confidence: 99%

A pre-series prototype for the superconducting undulator afterburner for the European XFEL

Casalbuoni

Geloni

et al. 2022

“…We have developed a program in Matlab that creates a dummy magnetic field, simulates the wire displacement for different pulse shapes (considering wire dispersion, finite pulse width, and sag), executes corrections in the wavenumber domain (some of them demonstrated in [5]), calculates the corrected wire movement in the time domain, and reconstructs the magnetic field [11].…”

Section: Magnetic Field Reconstruction Programmentioning

confidence: 99%

“…Inevitably, the finite divided differences technique introduces errors in the magnetic field -the so called discretization error. The program corrects the discretization error effects in the wavenumber domain by multiplying the Fourier Transform of the wire displacement samples by [11] −iκ∆z e −iκ∆z − 1 for short pulses and…”

Section: Magnetic Field Reconstruction Programmentioning

confidence: 99%

See 1 more Smart Citation

Requirements and limitations of the pulsed wire technique for measuring short-period long undulators’ magnetic field

Casalbuoni

2022

The pulsed wire method is an attractive option to measure the magnetic field in insertion devices, mainly for those with restricted access (e.g., small gaps, in-vacuum/cryogenic environments, etc.). Besides first and second field integrals, experiments have proved the feasibility of reconstructing the magnetic field profile. Undulators with a small gap and short period are — and are planned to be — used at diffraction-limited storage rings and free-electron lasers. This contribution outlines the pulsed wire system’s requirements to perform magnetic field reconstruction in such undulators. We examine the main expected limitations, particularly the dispersive, finite pulse-width, discretization error, and sag effects. Furthermore, we present the current status of developing the pulsed wire system at the European XFEL.

“…A second test-stand, named SUNDAE2, for the characterization of the final afterburner cryomodules, is also under construction in the same experimental area. In this second teststand the characterization of the module using the pulse-wire technique is also foreseen [15,16]. In this article we will describe the present design concept of SUNDAE1 and comment on the expected performances in terms of magnetic field characterization.…”

Section: Introductionmentioning

confidence: 99%

Conceptual Design of a Liquid Helium Vertical Test-Stand for 2m long Superconducting Undulator Coils

Marchetti

Abeghyan

et al. 2022

Superconducting Undulators (SCUs) can produce higher photon flux and cover a wider photon energy range compared to permanent magnet undulators (PMUs) with the same vacuum gap and period length. To build the know-how to implement superconducting undulators for future upgrades of the European XFEL facility, the test stand SUNDAE1 for the characterization of SCU is being developed. The purpose of SUNDAE1 is the training, tuning and development of new SCU coils by means of precise magnetic field measurements. The experimental setup will allow the characterization of magnets up to 2m in length. These magnets will be immersed in a Helium bath at 4K or 2K temperature. In this article, we describe the experimental setup and highlight its expected performances.