Cesiated porous molybdenum converter for intense negative ion sources

Alessi, J.; Hershcovitch, A.; Sluyters, T.

doi:10.1063/1.1137596

Cited by 10 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…233 Porous Mo converter to supply Cs from the back side was also tested, and a performance better than a solid Mo converter coupled to Cs injection was achieved. 234 The surface production type ion source is still a viable option to produce H À ion beam with fair stability and intensity.…”

Section: B Surface Sources For Accelerator Applicationsmentioning

confidence: 99%

Negative hydrogen ion production mechanisms

Bacal

Wada

2015

Applied Physics Reviews

246

173

View full text Add to dashboard Cite

International audienceNegative hydrogen/deuterium ions can be formed by processes occurring in the plasma volume and on surfaces facing the plasma. The principal mechanisms leading to the formation of these negative ions are dissociative electron attachment to ro-vibrationally excited hydrogen/deuterium molecules when the reaction takes place in the plasma volume, and the direct electron transfer from the low work function metal surface to the hydrogen/deuterium atoms when formation occurs on the surface. The existing theoretical models and reported experimental results on these two mechanisms are summarized. Performance of the negative hydrogen/deuterium ion sources that emerged from studies of these mechanisms is reviewed. Contemporary negative ion sources do not have negative ion production electrodes of original surface type sources but are operated with caesium with their structures nearly identical to volume production type sources. Reasons for enhanced negative ion current due to caesium addition to these sources are discussed. (31 pages, 265 refs

show abstract

Section: B Surface Sources For Accelerator Applicationsmentioning

confidence: 99%

Negative hydrogen ion production mechanisms

Bacal

Wada

2015

Applied Physics Reviews

246

173

View full text Add to dashboard Cite

show abstract

“…An advantage of the new ion source is that by simply changing the polarity of the extraction voltage, positive ions with an intensity comparable to that of the original ion source can be produced. For negative ions the performance of this new construction could probably be improved further, for example by using a caesiated converter [5]. We emphasize the simplicity of its construction-most components of the original ion source are unchanged and the new source is operated in the same way as the original; the modified ion source is easy to dissemble and replacement of the filament in the new set-up is much quicker.…”

Section: Discussionmentioning

confidence: 99%

A simple ion source for production of negative ions

Nabradi

Sarkadi

Penent

et al. 1999

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In contrast, the baseline converter (T ~350 o C) requires ~10 11 Cs/s to maintain a half-monolayer resulting in much more Cs lost to the LEBT. In related work, a 1983 experiment showed significantly more Hproduction from a porous versus solid converter [16]. Going forward we plan to test this configuration in the near future.…”

Section: Design Of a Direct-transfer Cs Systemmentioning

confidence: 94%

Design improvements to the SNS ion source and diagnostics

Welton,

Han,

Kalvas

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The U.S. Spallation Neutron Source (SNS) is a state-of-the-art neutron scattering facility delivering the world’s most intense pulsed-neutron beams to a wide array of instruments which are used to conduct investigations in many fields of science and engineering. The accelerator system is fed by an RF-driven, multicusp, H− ion source which nominally provides pulsed beam currents of 50-60 mA (1ms, 60Hz). This report provides a discussion of ongoing design improvements to the SNS ion source and Low Energy Beam Transport (LEBT) as well as diagnostic upgrades undertaken since the previous ICIS conference. These improvements include (i) simple mechanical modifications to the source outlet aperture which resulted in dramatically increased extracted beam current and comparable or lower emittance at similar beam currents, (ii) design improvements to the LEBT chopper target which will enable full power beam-dumping during physics studies, (iii) refinement of the SNS Allison emittance scanner that has enabled the first reliable LEBT beam measurements at full beam power (65kV, 50-100mA, 1ms, 60Hz) on the SNS ion source test stand and (iv) the implementation of a thermal imaging camera for the monitoring the LEBT electrode temperatures. (v) The design of an advanced Cs system, capable of more efficient Cs utilization with significantly lower Cs losses from the source is also presented. Mechanical details, computational simulations and experimental results are discussed within the context of these improvements.

show abstract

Cesiated porous molybdenum converter for intense negative ion sources

Cited by 10 publications

References 5 publications

Negative hydrogen ion production mechanisms

Negative hydrogen ion production mechanisms

A simple ion source for production of negative ions

Design improvements to the SNS ion source and diagnostics

Contact Info

Product

Resources

About