Design and Development of a Short-Period Superconducting Undulator at the APS

Kim, S.H.; Doose, C.; Kustom, R.L.; Moog, E. R.; Thompson, K.

doi:10.1109/tasc.2005.849545

Cited by 14 publications

(10 citation statements)

References 2 publications

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“…Over a wide range of currents, the amplitude of the gap field is linear with coil current density for a given magnet gap and period. Over the same range of currents, the peak field in the superconducting coil goes up with the coil current density, but is independent of the magnat gap [10]. As the period of a wiggler or undulator goes up, the peak induction in the superconductor goes down.…”

Section: Cooling a Superconducting Undulator At 40 To 45 Kmentioning

confidence: 98%

The potential role of cryogenics in insertion magnets

Green

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Most of the insertion magnets that are used for storage rings and free-electron lasers are room temperature permanent magnets. Superconducting wiggler and undulator magnets have been built, but their performance has been limited by the engineering current density and stability of the coils. Superconducting undulators must have a small gap and cell length, which can be a hindrance even when the beam vacuum chamber is at room temperature. Beam heating is also an issue. To control, the heat leak at low temperature, the beam vacuum chamber should be cooled to a temperature between 20 and 40 K. Permanent magnets fabricated from Nd-Fe-B can be cooled to cryogenic temperatures with an increase in the magnetic field within the magnet gap. This permits the magnet gap to be reduced considerably when the vacuum chamber is at the same temperature as the permanent magnet. This paper discusses the cryogenic cooling of both superconducting and cryogenic permanent magnet wigglers and undulators.

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Section: Cooling a Superconducting Undulator At 40 To 45 Kmentioning

confidence: 98%

The potential role of cryogenics in insertion magnets

Green

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…A winding scheme was developed in the R&D phase of the project and described in [16]. The SCU0 core is designed to wind the undulator coil first in one direction into every other groove for the full length.…”

Section: A Magnetic Designmentioning

confidence: 99%

“…This skew component of the field is believed to be due to net horizontal currents flowing on the back sides of the magnetic cores. These currents are caused by the chosen geometry of the coil winding with crossover wires between every other winding pack [16]. To suppress this undesirable effect, a new coil winding scheme will be implemented in the next device.…”

Section: B Magnetic Measurementsmentioning

confidence: 99%

Development and operating experience of a short-period superconducting undulator at the Advanced Photon Source

Ivanyushenkov¹,

Harkay²,

Abliz³

et al. 2015

Phys. Rev. ST Accel. Beams

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A decade-long effort at the Advanced Photon Source (APS) of Argonne National Laboratory (ANL) on development of superconducting undulators culminated in December 2012 with the installation of the first superconducting undulator "SCU0" into Sector 6 of the APS storage ring. The device was commissioned in January 2013 and has been in user operation since. This paper presents the magnetic and cryogenic design of the SCU0 together with the results of stand-alone cold tests. The initial commissioning and characterization of SCU0 as well as its operating experience in the APS storage ring are described.

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“…3), the stability margins of the device may become an issue and may be simulated with some form of heat loads from inside the beam chamber [4]. For the development of planartype SC undulators at the Advanced Photon Source (APS), an average J c (NbTi) up to 1.4 kA/mm 2 was achieved for a 14.5-mm-period short section.…”

mentioning

confidence: 99%

“…3 were reduced by 20% from that used in ref. [4]. The stability margin at the operating current density for λ = 12 mm may be enhanced by using an Nb 3 Sn coil.…”

mentioning

confidence: 99%

Achievable magnetic fields of super-ferric helical undulators for the ILC.

Kim¹,

Division²

2006

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-The magnetic fields on the beam axis of helical undulators for the proposed International Linear Collider (ILC) gamma-ray production were calculated for undulator periods of 10 mm and 12 mm. The calculation assumed the use of low-carbon steel for the magnetic poles and a beam chamber outer diameter of 6.3 mm. Using NbTi superconducting coils at 4.2 K, the on-axis field for a 10-mm-period undulator was 0.62 T at the critical current density. The field for a 12-mm undulator period was 0.95 T, which gives a K value of 1.06. The K value for an 11-mm undulator with Nb 3 Sn superconducting coils was estimated to about 1.1.A transverse periodic helical magnetic field may be generated on the axis of a doublehelix coil with equal currents in opposite directions in each helix [1]. An ideal helical field may be expressed as with E as the electron beam energy, γ is the relativistic factor of the electron energy, and θ is the angle between the z-axis and the radiated photon beam direction. The deflection parameter K is defined as . For K = 1, the spectral power density of the photon beam is maximum at γθ =1 for a single electron [1]. This note calculates the fields on the undulator axis with a beam chamber outer diameter of 6.3 mm for periods of 10 mm and 12 mm to evaluate whether the listed K value could be achieved. Figure 1 shows a double-helix model coil for the low-carbon steel poles and the beam chamber. A double-helix superconducting (SC) coil with equal currents in opposite directions in each helix was inserted in between the steel coils for the field calculations. A ANL/APS/LS-311 4/13/06

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Design and Development of a Short-Period Superconducting Undulator at the APS

Cited by 14 publications

References 2 publications

The potential role of cryogenics in insertion magnets

The potential role of cryogenics in insertion magnets

Development and operating experience of a short-period superconducting undulator at the Advanced Photon Source

Achievable magnetic fields of super-ferric helical undulators for the ILC.

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