Characterization of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll" id="d1e163" altimg="si1.gif"><mml:mi>β</mml:mi></mml:math>=0.5 double spoke cavity with a fixed power coupler

Li, H.; Jobs, Magnus; Kern, Rocio Santiago; Goryashko, Vitaliy; Hermansson, Lars; Bhattacharyya, A.K.; Lofnes, Tor; Gajewski, Konrad; Fransson, K.; Ruber, Roger

doi:10.1016/j.nima.2019.02.003

Cited by 6 publications

(8 citation statements)

References 7 publications

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“…In this prototype cryomodule testing, the beam vacuum was pumped from one side through the beam port with one turbomolecular pump. The major distinction from our last report on the high-power test [12] was that now the two cavity packages shared the same beam vacuum.…”

Section: General Information Of Conditioning Processesmentioning

confidence: 71%

“…In the last report on one cavity testing [12] in the HNOSS cryostat, we noticed a substantial dynamic heat load in the cavity compared to a vertical test result. During the disassembly of this poorly performing cavity package, it turned out that the ceramic window was sputtered by copper.…”

Section: General Information Of Conditioning Processesmentioning

confidence: 83%

“…To evaluate the cavity performance after the conditioning, we need around 120 kW forward power sent to the cavity to reach the target accelerating gradient of 9 MV/m, if the cavity resonance frequency and the generator frequency are perfectly tuned. In the HNOSS test [12] we conditioned the cavity package up to 120 kW and then measured the performance by locking the frequency with a Self-Excited-Loop (SEL). However, in the experiment reported in this article, it was an important milestone to assess the functionality of the closed-loop feedback control of the digital LLRF system for the accelerator operation.…”

Section: High Power Coupler Conditioning a Procedures Of Coupler Cond...mentioning

confidence: 99%

“…In 2015, we performed low-power tests on two prototype spoke cavities with helium jackets in HNOSS (Horizontal Nugget for Operation of Superconducting Systems) at the FREIA (Facility for Research Instrumentation and Accelerator development) laboratory [9][10][11]. After that, in 2017, one prototype DSR with a power coupler was installed in HNOSS and was powered by a tetrode power station [12,13]. In those tests, we developed and validated the infrastructure and testing protocols.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: General Information Of Conditioning Processesmentioning

confidence: 71%

Section: General Information Of Conditioning Processesmentioning

confidence: 83%

Section: High Power Coupler Conditioning a Procedures Of Coupler Cond...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Miyazaki,

Li,

Fransson

et al. 2020

Preprint

Self Cite

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“…After about 30 hours of conditioning and passing through three major multipacting regions, the cavity package reached a stable 9 MV/m flattop accelerating gradient. This is slightly above the nominal gradient for this cavity design intended to be used for the ESS accelerator [47].…”

Section: Double-spoke Cavity High-power Testmentioning

confidence: 88%

Accelerator Development at the FREIA Laboratory

Ruber,

Bhattacharyya,

Dancila

et al. 2021

Preprint

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The FREIA Laboratory at Uppsala University focuses on superconducting technology and accelerator development. It actively supports the development of the European Spallation Source, CERN, and MAX IV, among others. FREIA has developed test facilities for superconducting accelerator technology such as a double-cavity horizontal test cryostat, a vertical cryostat with a novel magnetic field compensation scheme, and a test stand for short cryomodules. Accelerating cavities have been tested in the horizontal cryostat, crab-cavities in the vertical cryostat, and cryomodules for ESS on the cryomodule test stand. High power radio-frequency amplifier prototypes based on vacuum tube technology were developed for driving spoke cavities. Solid-state amplifiers and power combiners are under development for future projects. We present the status of the FREIA Laboratory complemented with results of recent projects and future prospects.

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On the parallelization of multipacting simulation codes for the design of particle accelerator components

Navaridas,

Pascual,

Galarza

et al. 2024

J Supercomput

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Particle trajectory and collision simulation is a critical step of the design and construction of novel particle accelerator components. However it requires a huge computational effort which can slow down the design process. We started from a sequential simulation program which is used to study an event called Multipacting. Our work explains the physical problem that is simulated and the implications it can have on the behavior of the components. Then we analyze the original program’s operation to find the best options for parallelization. We first developed a parallel version of the Multipacting simulation and were able to accelerate the execution up to $$\sim 35\times $$ ∼ 35 × with 48 or 56 cores. In the best cases, parallelization efficiency was maintained up to 16 cores ($$\sim 95$$ ∼ 95 %) and the speed-up plateaus at around 40–48 cores. When this first parallelization effort was tried for multi-power simulations, we found that parallelism was severely limited with a maximum of $$20\times $$ 20 × speed-up. For this reason, we introduced a new method to improve the parallelization efficiency for this second use case. This method uses a shared processor pool for all simulations of electrons (OnePool). OnePool improved scalability by pushing the speed-up to over $$32\times $$ 32 × .

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Characterization of a β=0.5 double spoke cavity with a fixed power coupler

Cited by 6 publications

References 7 publications

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

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

Accelerator Development at the FREIA Laboratory

On the parallelization of multipacting simulation codes for the design of particle accelerator components

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