Record Gradients of 50 MV/m in TESLA SRF Cavities via Modified Low T Bake.

Bafia, Daniel

doi:10.26226/morressier.5fa409874d4e91fe5c54b977

Cited by 6 publications

(8 citation statements)

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“…For 1 GeV protons the transport is a mirror image of the PIP-II transport to the Booster. For that transport, the PIP-II design set a limit of 0.277 T , at which =0.12 s, and L = 6.43×10 7 . Losses per meter would be 1.6×10 -8 , which would be 0.032 W/m at 2MW beam power.…”

Section: Magnetic Stripping Constraintsmentioning

confidence: 99%

“…These two innovations, combined with continuing optimization of cavity treatments, have greatly increased useable gradients, with increased Q values. Most recently, a 75/120ºC modified low temperature bake improved Q by ~50%, and increased RF gradient to ~50 MV/m for 1300 MHz cavities [9]. These improvements will be incorporated into the BRL design and were considered in developing the SRF linac parameters presented in Table 4.…”

Section: Srf Cavities and Cryomodulesmentioning

confidence: 99%

“…Improving the 650 MHz cavity performance. Recent progress in SRF experimental and theoretical research resulted in a dramatic increase in achievable quality factors by a) the development of new surface treatments resulting in very high-Q via nitrogen doping [8]; and b) achievement of very high Q under real accelerator conditions via efficient magnetic flux expulsion (fast cooling and low flux pinning) [9,28]. These advances have been confirmed at laboratories worldwide and transferred to industry.…”

Section: Srf Research Topicsmentioning

confidence: 99%

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An 8 GeV Linac as the Booster Replacement in the Fermilab Power Upgrade

Belomestnykh

Checchin

Johnson

et al. 2021

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Increasing the Main Injector (MI) beam power above ~1.2 MW requires replacement of the 8 GeV Booster by a higher intensity alternative. In the Project X era, rapid-cycling synchrotron (RCS) and Linac solutions were considered for this purpose. In this paper, we consider the Linac version that produces 8 GeV Hbeam for injection into the Recycler Ring (RR) or Main Injector (MI). The Linac takes ~1 GeV beam from the PIP-II Linac and accelerates it to ~2 GeV in a 650 MHz SRF Linac, followed by a ~2-8 GeV pulsed Linac using 1300 MHz cryomodules. The Linac components incorporate recent improvements in SRF technology. The Linac configuration and beam dynamics requirements are presented. Injection options are discussed. Foil-based injection is the present standard but R&D toward implementing laser-assisted injection could enable a significant improvement. Research needed to implement the Booster replacement is described.

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Section: Magnetic Stripping Constraintsmentioning

confidence: 99%

Section: Srf Cavities and Cryomodulesmentioning

confidence: 99%

Section: Srf Research Topicsmentioning

confidence: 99%

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An 8 GeV Linac as the Booster Replacement in the Fermilab Power Upgrade

Belomestnykh

Checchin

Johnson

et al. 2021

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“…We further assume that the GHz cavities of Q ∼ 10 10 are cooled down to 1.4K. The benchmark value we take for the production modes in the emitter and the spectator mode in the receiver are all E peak = 80MV/m which has been demonstrated in non-pulsed cavity tests [34,35] and during the high power run of Dark SRF [23]. 4 With an integration time of one year and these benchmarks, an axion-photon coupling as small as g aγ ∼ 5 × 10 −11 GeV −1 can be probed in the limit of vanishing ALP mass.…”

Section: Jhep07(2021)053mentioning

confidence: 99%

Axion searches with two superconducting radio-frequency cavities

Gao

Harnik

2021

J. High Energ. Phys.

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We propose an experimental setup to search for Axion-like particles (ALPs) using two superconducting radio-frequency cavities. In this light-shining-through-wall setup the axion is sourced by two modes with large fields and nonzero $$ \overrightarrow{E}\cdot \overrightarrow{B} $$ E → ⋅ B → in an emitter cavity. In a nearby identical cavity only one of these modes, the spectator, is populated while the other is a quiet signal mode. Axions can up-convert off the spectator mode into signal photons. We discuss the physics reach of this setup finding potential to explore new ALP parameter space. Enhanced sensitivity can be achieved if high-level modes can be used, thanks to improved phase matching between the excited modes and the generated axion field. We also discuss the potential leakage noise effects and their mitigation, which is aided by $$ \mathcal{O} $$ O (GHz) separation between the spectator and signal frequencies.

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“…In the quest for high gradient, high quality factor SRF cavities, a two-step low temperature baking process showed an increase in accelerating gradient as well as quality factor well above 40 MV/m [87,88,89] in single cell cavities. Furthermore, the medium temperature baking also showed the improve quality factor with high accelerating gradient [90].…”

Section: B Recipe Development At Low Temperaturementioning

confidence: 99%

Nitrogen doping and infusion in SRF cavities: A review

Dhakal

2020

Physics Open

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Record Gradients of 50 MV/m in TESLA SRF Cavities via Modified Low T Bake.

Cited by 6 publications

References 0 publications

An 8 GeV Linac as the Booster Replacement in the Fermilab Power Upgrade

An 8 GeV Linac as the Booster Replacement in the Fermilab Power Upgrade

Axion searches with two superconducting radio-frequency cavities

Nitrogen doping and infusion in SRF cavities: A review

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