Accelerator development at the FREIA Laboratory

Ruber, Roger; Bhattacharyya, A.K.; Dancila, Dragos; Ekelöf, T.; Eriksson, J.; Fransson, K.; Gajewski, Konrad; Goryashko, Vitaliy; Hermansson, Lars; Jacewicz, M.; Jobs, Magnus; Jönsson, Åke; Li, H.; Lofnes, Tor; Miyazaki, Akira; Olvegård, Maja; Pehlivan, Esat; Peterson, T.; Pépitone, K.; Rydberg, Anders; Kern, Rocio Santiago; Wedberg, Rolf; Wirén, Anders; Yogi, Rutambhara; Ziemann, Volker

doi:10.1088/1748-0221/16/07/p07039

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…The Sushi magnet was tested at 4.2 K in the vertical cryostat Gersemi [35] of the FREIA (Facility for Research Instrumentation and Accelerators, Uppsala University, SE) laboratory. The cryostat is equipped with a dedicated magnet insert containing a lambda-plate, which allows operation between 4.2 K and 1.9 K maintaining the liquid helium bath at atmospheric pressure [36], providing a maximum current of 2 kA DC with 4 hybrid current leads (copper + NbTi).…”

Section: Methodsmentioning

confidence: 99%

Training-free performance of the wax-impregnated SuShi septum magnet

Barna,

Brunner,

Novák

et al. 2024

Supercond. Sci. Technol.

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In the framework of the Future Circular Collider Study a new septum magnet concept, nicknamed ``SuShi'' has been developed, and a prototype was built at Wigner RCP, and tested at the FREIA facility of Uppsala University. The concept uses a canted cosine theta (CCT)-like superconducting magnet and a passive superconducting shield to create a zero-field and high-field region within its aperture. SuShi is the first CCT magnet with both of its winding layers simultaneously impregnated with wax. This paper describes the first powering test of the empty magnet at 4.2 K, without the shield being inserted in its aperture. The performance of the magnet, including the observation of quench-back, estimation of hot-spot temperatures and the fraction of energy dissipated in the formers are presented, and most interestingly the absence of any quench during the entire testing period is reported. Sushi reached its nominal peak field of 3.64 T at 450 A, which corresponds to 76% of the calculated short sample limit along the load line, without training.

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Section: Methodsmentioning

confidence: 99%

Training-free performance of the wax-impregnated SuShi septum magnet

Barna,

Brunner,

Novák

et al. 2024

Supercond. Sci. Technol.

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“…The main equipment of the FREIA Laboratory currently includes a high-capacity helium liquefier, a large horizontal and a vertical cryostat, two 400 kW vacuum-tube RF sources, advanced hard-and software for process control and safe test bunkers, allowing for tests of superconducting high-power equipment like magnets and superconductive accelerating cavities. The FREIA Laboratory is located in a 1000 m 2 large, 10 m high hall forming part of the Ångstr ö m Laboratory in Uppsala [7]. The two 400 kW RF stations at 352 MHz were commissioned and installed by the industry.…”

Section: Sspa Development At Freiamentioning

confidence: 99%

The conceptual design of the high-efficiency 400 kW solid-state power station at 352 MHz for the European spallation source

Mohadeskasaei,

Dancila

2024

Int. J. Microw. Wireless Technol.

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This paper introduces an innovative conceptual design of a 400 kW solid-state power amplifier (SSPA) station and presents preliminary measurements for the key components. Recent advancements and benefits of solid-state technology have made the prospect of replacing vacuum tubes increasingly appealing. Historically, a significant challenge was the limited output power capacity of individual solid-state transistors, necessitating the integration of numerous units to generate high-power microwave signals in the range of hundreds of kilowatts. However, modern transistors capable of producing over 2 kW of output power have emerged, facilitating this transition. Another weak point was low power efficiency in high-power operating mode. The advanced rugged technology (ART) of solid-state devices enables the utilization of these transistors in nonlinear and switching operating classes, thereby enabling the creation of high-efficiency high-power amplifiers. In this conceptual design, 264 SSPA modules based on ART, each with a power output of 1.6 kW, are combined. The measurements revealed a single SSPA capable of delivering up to 2 kW output power with a power efficiency of 73% at frequency of 352 MHz. Due to the minimal losses during module combination and working SSPA in Class-C operation mode, the power efficiency of the station is expected to closely mirror that of a single module.

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“…The FREIA laboratory is equipped with two power stations dedicated to the ESS project [18]. During the prototype cryomodule testing, one power station was available while the other was under commissioning [19]. The conditioning was performed by switching from one cavity package to the other with the available high power station, which outputs maximum 400 kW (duty ratio 4.5%) from two combined tetrode tubes.…”

Section: General Information Of Conditioning Processesmentioning

confidence: 99%

Contamination and conditioning of the prototype double spoke cryomodule for European Spallation Source

Miyazaki,

Li,

Fransson

et al. 2020

Preprint

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A superconducting Double Spoke Resonator (DSR) is the technology of choice in a low energy section of a high power proton linear accelerator. At the FREIA laboratory in Uppsala University, we have tested two DSRs in a prototype cryomodule for the European Spallation Source (ESS) project. It showed that the conditioning process of these cavity packages would be the key for the series production tests. In this paper, we present the conditioning procedure that we developed, and also describe the results with a special focus on the cross-contamination observed between two highpower couplers. This study defines a standard conditioning recipe for the series DSR production for ESS and also for future similar projects in the world.

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Accelerator development at the FREIA Laboratory

Cited by 4 publications

References 38 publications

Training-free performance of the wax-impregnated SuShi septum magnet

Training-free performance of the wax-impregnated SuShi septum magnet

The conceptual design of the high-efficiency 400 kW solid-state power station at 352 MHz for the European spallation source

Contamination and conditioning of the prototype double spoke cryomodule for European Spallation Source

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