A Direct Extraction H- Ion Source

Allison, P.

doi:10.1109/tns.1977.4329022

Cited by 36 publications

(23 citation statements)

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“…These valves have long been used in H − ion sources for gas injection under vacuum conditions [7,8]. These valves open at 20 V, flexing proportionally to the applied voltage until they reach 100 V. A Viton disk has been glued to the center of the valve and provides a good vacuum seal.…”

Section: Solenoid Gas Valvementioning

confidence: 99%

Improvements on the stability and operation of a magnetron H− ion source

Sosa

Bollinger

Karns

et al. 2017

Phys. Rev. Accel. Beams

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The magnetron H − ion sources developed in the 1970s currently in operation at Fermilab provide beam to the rest of the accelerator complex. A series of modifications to these sources have been tested in a dedicated off-line test stand with the aim of improving different operational issues. The solenoid type gas valve was tested as an alternative to the piezoelectric gas valve in order to avoid its temperature dependence. A new cesium oven was designed and tested in order to avoid glass pieces that were present with the previous oven, improve thermal insulation and fine-tune its temperature. A current-regulated arc modulator was developed to run the ion source at a constant arc current, providing very stable beam outputs during operations. In order to reduce beam noise, the addition of small amounts of N 2 gas was explored, as well as testing different cathode shapes with increasing plasma volume. This paper summarizes the studies and modifications done in the source over the past three years with the aim of improving its stability, reliability and overall performance.

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Section: Solenoid Gas Valvementioning

confidence: 99%

Improvements on the stability and operation of a magnetron H− ion source

Sosa

Bollinger

Karns

et al. 2017

Phys. Rev. Accel. Beams

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“…The BESIII detector is modeled with geant4 [9,10]. The production of the J/ψ resonance is implemented with the MC event generator kkmc [11,12], while the decays are simulated with evtgen [13].…”

Section: Detector and Monte Carlo Simulationmentioning

confidence: 99%

Observation ofη′→ωe+e−

Ablikim¹,

Ачасов²,

Ai³

et al. 2015

Phys. Rev. D

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Based on a sample of η ′ mesons produced in the radiative decay J/ψ → γη ′ in 1.31 × 10 9 J/ψ events collected with the BESIII detector, the decay η ′ → ωe + e − is observed for the first time, with a statistical significance of 8σ. The branching fraction is measured to be B(η ′ → ωe + e − ) = (1.97 ± 0.34(stat) ± 0.17(syst)) × 10 −4 , which is in agreement with theoretical predictions. The branching fraction of η ′ → ωγ is also measured to be (2.55 ± 0.03(stat) ± 0.16(syst)) × 10 −2 , which is the most precise measurement to date, and the relative branching fractionis determined to be (7.71 ± 1.34(stat) ± 0.54(syst)) × 10 −3 .

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“…In pulsed mode a fast gas valve (14), described in [13], injects calibrated gas portions into a small discharge volume. For long term operation, cesium will be injected into the discharge volume by an external cesium delivery system (15), as in the FNAL magnetron [6]. Improved cooling will improve cesium recycling on the electrode surface and will prevent electrode sputtering and flake formation.…”

Section: Compact Sps a Magnetron (Planotron)mentioning

confidence: 99%

“…The Penning discharge SPS was invented by Dudnikov in BINP [4]. It has had a long history of development at LANL [8,12,15]. Now it is successfully used at ISIS RAL [16,17] and is under development for the Chinese SNS.…”

Section: B Penning Discharge Spsmentioning

confidence: 99%

Cesiation in highly efficient surface plasma sources

Dudnikov

Johnson

2011

Phys. Rev. ST Accel. Beams

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Novel modifications of H À =D À source designs have been proposed. New sources under development include advanced versions of a compact surface plasma source which will efficiently generate brighter beam in noiseless discharge, deliver significantly increased (up to 20 mA) average current with better electrode cooling using new materials, and have significantly extended lifetime, fast beam chopping capability, and reduced cesium loss. Related ion sources that use cesium are described and an improved cesiation procedure for reproducible production of high efficiency H À ion generation is considered.

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A Direct Extraction H- Ion Source

Cited by 36 publications

References 0 publications

Improvements on the stability and operation of a magnetron H− ion source

Improvements on the stability and operation of a magnetron H− ion source

Observation ofη′→ωe+e−

Cesiation in highly efficient surface plasma sources

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