SNS proton power upgrade

Howell, M.; DeGraff, B.; Galambos, J.; Kim, S. H.

doi:10.1088/1757-899x/278/1/012185

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Combining the input data with the transmission, a neutron flux of dφ/dλ = 7 • 10 6 n/s/cm 2 /MW/Å for 8.9 Å neutrons is expected. This yields a total UCN production rate, summed over both measurement cells, of dN UC N /dt = 1800 UCN/s for a cell geometry of 7.5 cm wide × 10 cm high × 40 cm long and a proton beam power of 2 MW [94]. While the transmission was evaluated without any windows in place, only a few % reduction is anticipated from these.…”

Section: Cold Neutron Transportmentioning

confidence: 99%

A new cryogenic apparatus to search for the neutron electric dipole moment

et al. 2019

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A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). This apparatus uses superfluid 4 He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallation Neutron Source at Oak Ridge National Laboratory, uses polarized 3 He from an Atomic Beam Source injected into the superfluid 4 He and transported to the measurement cells where it serves as a co-magnetometer. The superfluid 4 He is also used as an insulating medium allowing significantly higher electric fields, compared to previous experiments, to be maintained across the measurement cells. These features provide an ultimate statistical uncertainty for the EDM of 2 − 3 × 10 −28 e-cm, with anticipated systematic uncertainties below this level.

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Section: Cold Neutron Transportmentioning

confidence: 99%

A new cryogenic apparatus to search for the neutron electric dipole moment

et al. 2019

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“…The Proton Power Upgrade (PPU) project will double the proton beam power from 1.4 to 2.8 MW by adding 7 additional cryomodules each contains four six cell high beta (HB) β= 0.81 superconducting radio frequency cavities. Some modification were made to both cavities and helium vessels based on the operating experience of earlier SNS cryomodules and one of the prototypes currently installed in the linac [1]. Additionally, some modification were made in the cavity fabrication.…”

Section: Introductionmentioning

confidence: 99%

“…This removes a complex geometry to chemically process and rinse during the cavity processing reducing the possibility for early field emission and multipacting. Furthermore, some modifications were made to the fundamental power couplers and cryomodule end cans based on the operational experience of the original SNS project [1].…”

Section: Introductionmentioning

confidence: 99%

Status of SNS Proton Power Upgrade SRF Cavities Production Qualification

Dhakal

Daly

Davis

et al. 2021

International Conference on RF Superconductivity (20th), East Lansing, MI, USA, 28 June-02 July 2021

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The Proton Power Upgrade project at Oak Ridge National Lab's Spallation Neutron Source (SNS PPU) currently being constructed will double the proton beam power from 1.4 to 2.8 MW by adding 7 additional cryomodules, each contains four six-cell high beta (β= 0.81) superconducting radio frequency cavities. The cavities were built by Research Instruments, Germany, with all the cavity processing done at the vendor site, including electropolishing as the final active chemistry step. All 28 cavities needed for 7 cryomodules were delivered to Jefferson Lab, ready to be tested. The cryogenic RF qualifications and helium vessel welding were done at Jefferson Lab. The performance largely exceed the requirements, and greatly exceeded the performance of the original SNS cavity production series. Here, we present the summary of RF test on production cavities to this date.

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