Performance of the Magnetron H− Source on the BNL 200 MeV Linac

Alessi, J.

doi:10.1063/1.1522646

Cited by 23 publications

(19 citation statements)

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“…The ion source of Linac4 shall eventually provide H -ions at 45 keV energy, in pulses of 0.5 ms duration and 80 mA intensity within a transverse rms emittance of 0.25 ·mm·mrad. The path chosen towards these beam properties includes three types of ion sources and beam intensity stages; 2 MHz Radio Frequency (RF) driven 20 mA H -source 2 relying on volume production 3 , 2 MHz RF-driven 40 mA cesiated surface H -source 4 inspired from the single cesiation approach successfully operating at the Spallation Neutron Source (SNS) 5 and an upgrade to 45 kV operation voltage of the Magnetron H -source 6 successfully operating at Brookheaven National Laboratory (BNL).…”

Section: Introductionmentioning

confidence: 99%

CERN’s Linac4 H− sources: Status and operational results

Lettry

Aguglia

Alessi

et al. 2015

AIP Conference Proceedings

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Section: Introductionmentioning

confidence: 99%

CERN’s Linac4 H− sources: Status and operational results

Lettry

Aguglia

Alessi

et al. 2015

AIP Conference Proceedings

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“…BNL's magnetron operates at 7.5 Hz and delivers H − pulses with 0.7 ms duration, up to 100 mA at 35 kV [3]. A scheme of the magnetron source is shown in Fig.…”

Section: Bnl Magnetron Sourcementioning

confidence: 99%

“…The beam used for calculations is 100 mA of H − and the ratio of e/H -equal to ½ leads to a 50 mA current of electrons [3], as given in Table 1. Table 2 lists the cross section for the reactions of H − ions and electrons with cesium and hydrogen, leading to positive ions.…”

Section: Hydrogen and Cesium Vapors Ionization Processmentioning

confidence: 99%

Estimation of sputtering damages on a magnetron H− ion source induced by Cs+ and H+ ions

Pereira

Lettry

Alessi

et al. 2013

AIP Conference Proceedings

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An H− ion source is being developed for CERN's Linac4 accelerator. A beam current requirement of 80 mA and a reliability above 99% during 1 year with 3 month uninterrupted operation periods are mandatory. To design a low-maintenance long life-time source, it is important to investigate and understand the wear mechanisms. A cesiated plasma discharge ion source, such as the BNL magnetron source, is a good candidate for the Linac4 ion source. However, in the magnetron source operated at BNL, the removal of material from the molybdenum cathode and the stainless steel anode cover plate surfaces is visible after extended operation periods. The observed sputtering traces are shown to result from cesium vapors and hydrogen gas ionized in the extraction region and subsequently accelerated by the extraction field. This paper presents a quantitative estimate of the ionization of cesium and hydrogen by the electron and H− beams in the extraction region of BNL's magnetron ion source. The respective contributions of Cs+ and H+ ions to the sputtering process are estimated. Abstract. An H − ion source is being developed for CERN's Linac4 accelerator. A beam current requirement of 80 mA and a reliability above 99 % during 1 year with 3 month uninterrupted operation periods are mandatory. To design a low-maintenance long life-time source, it is important to investigate and understand the wear mechanisms. A cesiated plasma discharge ion source, such as the BNL magnetron source, is a good candidate for the Linac4 ion source. However, in the magnetron source operated at BNL, the removal of material from the molybdenum cathode and the stainless steel anode cover plate surfaces is visible after extended operation periods. The observed sputtering traces are shown to result from cesium vapors and hydrogen gas ionized in the extraction region and subsequently accelerated by the extraction field. This paper presents a quantitative estimate of the ionization of cesium and hydrogen by the electron and H − beams in the extraction region of BNL's magnetron ion source. The respective contributions of Cs + and H + ions to the sputtering process are estimated. Presented at (NIBS

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“…The straight line is a linear fit to the data and the curve line represents a square root fit to the data. The emittance values in this plot were gleaned from the following references [6,11,12,13,14,15,16,17,18,19].…”

Section: Bnl Magnetronmentioning

confidence: 99%