Record performance of and extraction studies with the Spallation Neutron Source H− injector

Stöckli, M. P.; Han, Binghong; Murray, S. N.; Pennisi, Terry R; Santana, Manuel; Stinson, Chris; Welton, R. F.

doi:10.1063/1.4995730

Cited by 18 publications

(6 citation statements)

References 28 publications

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“…The pressures in the SNS and J-PARC PCHs for the hydrogen flow rates of 27 and 17 SCCM are estimated as 2.7 and 1 Pa, respectively. In the SNS PCH for an about 10% higher Q H2 of 30 SCCM, the pressure is measured as 3-3.2 Pa [20], which is about 10% higher than the estimated value for the Q H2 of 27 SCCM.…”

Section: Low-power Continuous-wave(cw) Igniter Plasma Driven By 30 Mmentioning

confidence: 62%

Cesiated surface H⁻ ion source: optimization studies

Ueno

2017

New J. Phys.

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The H − ion beam intensity required for high-energy and high-intensity proton accelerators is continuously increasing. The required 95%-beam transverse normalized root mean square emittance (ε 95%rnmsx/y ) of the beam is around 0.25 πmm mrad for all accelerators. The Japan Proton Accelerator Complex (J-PARC) 400 MeV linear accelerator (LINAC) succeeded in accelerating the world's highest-class H − ion beam of 50 mA with a cesiated RF-driven H − ion source. This was achieved by increasing the beam brightness through the following measures

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Section: Low-power Continuous-wave(cw) Igniter Plasma Driven By 30 Mmentioning

confidence: 62%

Cesiated surface H⁻ ion source: optimization studies

Ueno

2017

New J. Phys.

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“…It is an RF-antenna multicusp (i.e., multipole magnet) volume and surface source; this source operates via inductive excitation of the plasma using a porcelain-coated copper antenna. Caesium is added for enhancing the surface ionisation rate [11,18] and the beam is injected at an angle to improve electron extraction [19].…”

Section: Ion Source Baselinementioning

confidence: 99%

“…Recent experience at SNS shows that such an ion source can be operated routinely, delivering 50-60 mA H − beams into the RFQ at a 6% duty cycle, with availability of ∼ 99.5% [18]. Additional labs in the US have adopted this design for its performance and ease of installation [20]; SNS is also now testing the performance of an external-antenna type source (not pictured) with improvements in efficiency (output current vs. input power) and a smoother beam pulse profile.…”

Section: Ion Source Baselinementioning

confidence: 99%

The European Spallation Source neutrino super-beam conceptual design report

Alekou

Baussan

Bhattacharyya

et al. 2022

Eur. Phys. J. Spec. Top.

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A design study, named $${\text {ESS}}\nu {\text {SB}}$$ ESS ν SB for European Spallation Source neutrino Super Beam, has been carried out during the years 2018–2022 of how the 5 MW proton linear accelerator of the European Spallation Source under construction in Lund, Sweden, can be used to produce the world’s most intense long-baseline neutrino beam. The high beam intensity will allow for measuring the neutrino oscillations near the second oscillation maximum at which the CP violation signal is close to three times higher than at the first maximum, where other experiments measure. This will enable CP violation discovery in the leptonic sector for a wider range of values of the CP violating phase $$\delta _{{\mathrm{CP}}}$$ δ CP and, in particular, a higher precision measurement of $$\delta _{{\mathrm{CP}}}$$ δ CP . The present Conceptual Design Report describes the results of the design study of the required upgrade of the ESS linac, of the accumulator ring used to compress the linac pulses from 2.86 ms to 1.2 μs, and of the target station, where the 5 MW proton beam is used to produce the intense neutrino beam. It also presents the design of the near detector, which is used to monitor the neutrino beam as well as to measure neutrino cross sections, and of the large underground far detector located 360 km from ESS, where the magnitude of the oscillation appearance of $$\nu _{e }$$ ν e from $$\nu _{\mu }$$ ν μ is measured. The physics performance of the $${\text {ESS}}\nu {\text {SB}}$$ ESS ν SB research facility has been evaluated demonstrating that after 10 years of data-taking, leptonic CP violation can be detected with more than 5 standard deviation significance over 70% of the range of values that the CP violation phase angle $$\delta _{{\mathrm{CP}}}$$ δ CP can take and that $$\delta _{{\mathrm{CP}}}$$ δ CP can be measured with a standard error less than 8° irrespective of the measured value of $$\delta _{{\mathrm{CP}}}$$ δ CP . These results demonstrate the uniquely high physics performance of the proposed $${\text {ESS}}\nu {\text {SB}}$$ ESS ν SB research facility.

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“…9, it should be possible to extract a DC Hbeam current of ~50 mA using ~10 kW of arc power and Cs-injection from modified D-Pace source. We should also note that this level of Csenhancement is also observed in RF-driven, multicusp Hion sources operating with discharge powers of ~50 kW [10]. In the next sections we will use plasma, ion optical, mechanical and electrical simulations and calculations to explore the feasibility and limitations of modifying a D-Pace source to support longterm, stable operation under these conditions.…”

Section: Development Path Towards An Operational >15 Ma DC H -Ion Sourcementioning

confidence: 87%

LANL NPB Project: Ion Source Selection and Development Path

Welton¹,

Han²,

Stöckli³

et al. 2019

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The ORNL team will provide LANL with a scoping / feasibility study of Hsources which could potentially be developed to approach the goal of producing a single high-duty-factor Hbeam of up to ~100 mA suitable for acceleration by an RFQ. Currently, no existing Hsources have been shown to operate anywhere near this goal so the study will focus on identifying the most promising approach and define the existing option space. Attention will be given to source concepts which are most likely to be scalable to continuous beam operation while offering lower-risk, lower duty-factor or beam current operation in the shorter term. The study will discuss the technology within this option space, tradeoffs and identify the best path forward. Once the best option is identified, an estimate of the expected output emittance, beam current, achievable beam duty-factor, hydrogen and cesium consumption rates, physical size and weight estimates of the source and supporting subsystems will be provided. This work will lay the foundation for developing a conceptual source design in Development 2 which will inform an actual mechanical design that will be used to either construct a prototype source or modify an existing source as part of a future technology development program for the project. The relative technology development risk and mitigations would also be defined

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Record performance of and extraction studies with the Spallation Neutron Source H− injector

Cited by 18 publications

References 28 publications

Cesiated surface H⁻ ion source: optimization studies

Cesiated surface H⁻ ion source: optimization studies

The European Spallation Source neutrino super-beam conceptual design report

LANL NPB Project: Ion Source Selection and Development Path

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Record performance of and extraction studies with the Spallation Neutron Source H− injector

Cited by 18 publications

References 28 publications

Cesiated surface H− ion source: optimization studies

Cesiated surface H− ion source: optimization studies

The European Spallation Source neutrino super-beam conceptual design report

LANL NPB Project: Ion Source Selection and Development Path

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Cesiated surface H⁻ ion source: optimization studies

Cesiated surface H⁻ ion source: optimization studies