Magnetic design and modelling of a 14 mm-period prototype superconducting undulator

Mishra, G.; Gehlot, Mona; Sharma, Geetanjali; Trillaud, F.

doi:10.1107/s1600577517001540

Cited by 6 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technology is by now mature enough to be applied in a UC-XFEL. Other standard approaches to undulator development may include superconducting undulators, where designs with periods nearing those needed have been studied [152]. At few-mm period length, development work on novel variations on short period Halbach arrays is being pursued [59].…”

Section: Discussionmentioning

confidence: 99%

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Rosenzweig

2019

Advances in Laboratory-Based X-Ray Sources, Optics, and Applications VII

View full text Add to dashboard Cite

In the field of beam physics, two frontier topics have taken center stage due to their potential to enable new approaches to discovery in a wide swath of science. These areas are: advanced, high gradient acceleration techniques, and xray free electron lasers (XFELs). Further, there is intense interest in the marriage of these two fields, with the goal of producing a very compact XFEL. In this context, recent advances in high gradient radio-frequency cryogenic copper structure research have opened the door to the use of surface electric fields between 250 and 500 MV/m. Such an approach is foreseen to enable a new generation of photoinjectors with sixdimensional beam brightness beyond the current state-of-the-art by well over an order of magnitude. This advance is an essential ingredient enabling an ultra-compact XFEL (UC-XFEL). In addition, one may accelerate these bright beams to GeV scale in less arXiv:2003.06083v1 [physics.acc-ph]An Ultra-Compact X-Ray Free-Electron Laser 2 than 10 meters. Such an injector, when combined with inverse free electron laserbased bunching techniques can produce multi-kA beams with unprecedented beam quality, quantified by 50 nm-rad normalized emittances. These beams, when injected into innovative, short-period (1-10 mm) undulators uniquely enable UC-XFELs having footprints consistent with university-scale laboratories. We describe the architecture and predicted performance of this novel light source, which promises photon production per pulse of a few percent of existing XFEL sources. We review implementation issues including collective beam effects, compact x-ray optics systems, and other relevant technical challenges. To illustrate the potential of such a light source to fundamentally change the current paradigm of XFELs with their limited access, we examine possible applications in biology, chemistry, materials, atomic physics, industry, and medicine which may profit from this new model of performing XFEL science.

show abstract

Section: Discussionmentioning

confidence: 99%

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Rosenzweig

2019

Advances in Laboratory-Based X-Ray Sources, Optics, and Applications VII

View full text Add to dashboard Cite

show abstract

“…In 2000, Rossmanith et al first adopted the boundary integral method-based RADIA code (implemented in Mathematica) for the magnetic field calculation of an in-vacuum planar SCU [141]. Further studies based on RADIA code were reported for the magnetic design or field optimization of planar SCU [59,[142][143][144], hybrid planar-tilted SCU [117,120], staggered-array BHTSU [108], Delta-like SCAPE undulator [125] and NbTi helical SCU [13]. In 2002, Caspi et al first adopted the finite element method (FEM) software TOSCA/OPERA 2D for the magnetic design of helical windings based planar SCU [145].…”

Section: Modelling Toolsmentioning

confidence: 99%

“…Other scaling laws were later proposed by Kim for a planar SCU with fixed Jλ [157] and by Mishra for a 14 mm period planar SCU based on the formula for a hybrid PM undulator [144]. In 2014, Kinjo et al presented an analytical formula equation ( 6) for calculating the on-axis field B 0 in a staggeredarray bulk HTSU and validated it through experiments…”

Section: Scaling Lawsmentioning

confidence: 99%

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Zhang

Calvi²

2022

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Superconducting undulators (SCUs) with period >15 mm can offer much higher on-axis undulator field B0 than state-of-the-art cryogenic permanent magnet undulators (CPMUs) with the same period and vacuum gap. The commissioned NbTi planar SCUs for user operation in the Karlsruhe Institute of Technology (KIT) synchrotron and the Advanced Photon Source (APS) storage ring are operated stably without quenches, producing outperformed photon flux in the high energy part of the hard X-ray spectrum. Another potential advantage of deploying SCU is its radiation hardness, a crucial characteristic for being used in free electron lasers (FELs) driven by high repetition rate superconducting linear accelerators (LINACs) and diffraction limited storage rings (DLSRs) with small vacuum gap and large averaged beam current. Development of shorter period but high field SCU is an important mission in an EU founded CompactLight project as this technology would reduce both the length of undulators and the length of LINACs. This review paper first overviews the research and development of SCUs worldwide from late 1970s to 2021, then presents the SCU design requirements and compares the theory limits of different types of planar and helical SCUs, and finally reviews the technical challenges including the SCU cryostat, the magnetic field measurement, the integral/local field correction and the high-temperature superconductor (HTS) challenges and prospects the research needs for SCUs.

show abstract

“…In recent years, most SCU research has focused on lowtemperature superconductors (LTS) such as Nb 3 Sn [2][3][4][5][6][7] and NbTi [8][9][10] SCUs. These conductors have good performance in the field, but unfortunately, they need to be operated at low temperatures; they have very little temperature margin, which makes cryocooled operation difficult [4,7,11].…”

Section: Introductionmentioning

confidence: 99%

Development and testing of a three-period, subsize 2G AIMI MgB₂ planar undulator

Garg,

Rochester,

Majoros

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Compared to Nb3Sn- and NbTi-wound superconducting undulators (SCUs), MgB2-wound SCUs are of interest for future electron synchrotron beam light sources owing to their higher temperature operating margin and associated stability. In this study, a three-period undulator consisting of twelve racetrack coils wound with 2nd generation (2 G) multifilamentary advanced-internal-magnesium-infiltration MgB2 strands were fabricated and tested in liquid and gaseous helium (He) over a temperature range of 4.2 K–20 K. The coil winding cross sections (in each coil) were 5 mm wide and 4.8 mm thick. At 4.2 K, a critical current (I c) of 325.7 Amps produced a maximum undulator bore field of 1.19 T. It should be noted that the short, 3-period nature of the coil led to an asymmetry in the field profile (the maximum positive field was 1.19 T, the maximum negative was −0.25 T), suggesting a peak field of 0.72 T in the absence of end effects. Finite element modeling (FEM) results of simulations for a one meter long undulator of otherwise identical design gave 0.85 T (larger because of higher currents enabled by the lower field). But in any case, the I c value coil reached is 94% of that of the short sample (dictated by the 1.19 T positive field for the coil as tested). FEM was performed to study the magnetic field profile, which was validated experimentally. The magnetic field was measured using a Hall probe which was translated along the beam axis during measurement to explore the spatial field variation along the beam travel direction. The spatially alternating field was asymmetric, and the maximum field was more prominent in the positive direction than in the negative direction, the difference being due to broken symmetry, that is, short coil end effects. In this work, we show useful fields are possible for MgB2 undulators; the use of such conductors can allow a larger thermal margin and enable conduction-cooled operation.

show abstract

Magnetic design and modelling of a 14 mm-period prototype superconducting undulator

Cited by 6 publications

References 15 publications

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Development and testing of a three-period, subsize 2G AIMI MgB₂ planar undulator

Contact Info

Product

Resources

About

Magnetic design and modelling of a 14 mm-period prototype superconducting undulator

Cited by 6 publications

References 15 publications

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Review and prospects of world-wide superconducting undulator development for synchrotrons and FELs

Development and testing of a three-period, subsize 2G AIMI MgB2 planar undulator

Contact Info

Product

Resources

About

Development and testing of a three-period, subsize 2G AIMI MgB₂ planar undulator