The front end test stand high performance H− ion source at Rutherford Appleton Laboratory

Faircloth, D. C.; Lawrie, Scott; Letchford, Alan; Gabor, C.; Wise, P.; Whitehead, Mark; Wood, T.; Westall, M.; Findlay, D.J.S.; Perkins, M. J.; Savage, P.; Lee, D. A.; Pozimski, J.

doi:10.1063/1.3271169

Cited by 18 publications

(13 citation statements)

References 8 publications

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“…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. The fundamental difference between the magnetron and Penning sources is that, in the magnetron, H À ions produced at the cathode are directly extracted, while in the Penning source the ions must undergo a charge-exchange process or scattering on atomic hydrogen to reach the emission aperture since there is no direct path from the cathode to the aperture.…”

Section: B Penning Discharge Spsmentioning

confidence: 99%

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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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Section: B Penning Discharge Spsmentioning

confidence: 99%

“…The RAL Penning SPS that is in use at the ISIS facility delivered 35 mA (discharge df $ 2:5%, beam df $ 1%) after 650 kV preacceleration for a period up to 50 days [8,17] (the lifetime is 25 days with 50 mA).…”

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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“…A ceramic ring electrically insulates the body from the cathode. The source body is cooled by air flow and the mounting flange is cooled by water [4].…”

Section: Isis Ion Sourcementioning

confidence: 99%

“…The Penning H − source of ISIS is used to study the behavior of the discharge source at low repetition rates. The H − Penning source provides beam for the ISIS spallation neutron source routinely producing 55 mA of H − ions during 0.2-0.25 ms pulses at 50 Hz, for uninterrupted periods of up to 50 days [4]. Table 1 compares relevant operating parameters of the BNL, ISIS and Linac4 ion sources.…”

Section: Introductionmentioning

confidence: 99%

Operation and thermal modeling of the ISIS H− source from 50 to 2 Hz repetition rates

Pereira¹,

Faircloth²,

Lettry³

2013

AIP Conference Proceedings

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CERN's Linac4 accelerator H− ion source, currently under construction, will operate at a 2 Hz repetition rate, with pulse length of 0.5 ms and a beam current of 80 mA. Its reliability must exceed 99 % with a mandatory 3 month uninterrupted operation period. A Penning ion source is successfully operated at ISIS; at 50 Hz repetition rate it reliably provides 55 mA H− pulses of 0.25 ms duration over 1 month. The discharge plasma ignition is very sensitive to the temperatures of the discharge region, especially of its cathode. The investigation by modeling and measurement of operation parameters suitable for arc ignition and H− production at 2 Hz is of paramount importance and must be understood prior to the implementation of discharge ion sources in the Linac4 accelerator. In its original configuration, the ISIS H− source delivers beam only if the repetition rate is above 12.5 Hz, this paper describes the implementation of a temperature control of the discharge region aiming at lower repetition rate operation. The experimental results of the modified source successfully operated down to 1.6 Hz and providing 30 mA H− pulses of 0.75 ms duration are presented. A thermal modeling of the ISIS ion source gives insight to the relevant parameters. The analysis demonstrates the adaptability of discharge sources for the operating conditions of the Linac4. Abstract. CERN's Linac4 accelerator H − ion source, currently under construction, will operate at a 2 Hz repetition rate, with pulse length of 0.5 ms and a beam current of 80 mA. Its reliability must exceed 99 % with a mandatory 3 month uninterrupted operation period. A Penning ion source is successfully operated at ISIS; at 50 Hz repetition rate it reliably provides 55 mA H − pulses of 0.25 ms duration over 1 month. The discharge plasma ignition is very sensitive to the temperatures of the discharge region, especially of its cathode. The investigation by modeling and measurement of operation parameters suitable for arc ignition and H − production at 2 Hz is of paramount importance and must be understood prior to the implementation of discharge ion sources in the Linac4 accelerator. In its original configuration, the ISIS H − source delivers beam only if the repetition rate is above 12.5 Hz, this paper describes the implementation of a temperature control of the discharge region aiming at lower repetition rate operation. The experimental results of the modified source successfully operated down to 1.6 Hz and providing 30 mA H − pulses of 0.75 ms duration are presented. A thermal modeling of the ISIS ion source gives insight to the relevant parameters. The analysis demonstrates the adaptability of discharge sources for the operating conditions of the Linac4.

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“…It runs with a 760 µs discharge pulse length at a 50 Hz repetition rate. The Front End Test Stand (FETS) project [1] requires a 2 ms 50 Hz 60 mA H -beam. To cleanly extract a 2 ms beam it is necessary to produce a 2.2 ms long discharge pulse in the ion source.…”

Section: Introductionmentioning

confidence: 99%