Emittance Characteristics of High-Brightness H− Ion Sources

Welton, R. F.; Stöckli, M. P.; Keller, R.; Thomae, R.; Thomason, J. W. G.; Sherman, Justin; Alessi, J.

doi:10.1063/1.1517915

Cited by 10 publications

(11 citation statements)

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“…A sophisticated treatment of background in measured transverse phase space distributions has been developed, and applied to several sources [24], [25]. Except for the magnetron source, which is subject to emittance growth associated with extracting ions directly from the cathode, the surface converter, Penning SPS, and cesiated multicusp sources were found to have nearly the same emittance.…”

Section: A Beam Emittancementioning

confidence: 99%

Negative hydrogen ion sources for accelerators

Moehs

Peters

Sherman

2005

IEEE Trans. Plasma Sci.

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A variety of H ion sources are in use at accelerator laboratories around the world. A list of these ion sources includes surface plasma sources with magnetron, Penning and surface converter geometries as well as magnetic-multipole volume sources with and without cesium. Just as varied is the means of igniting and maintaining magnetically confined plasmas. Hot and cold cathodes, radio frequency, and microwave power are all in use, as well as electron tandem source ignition. The extraction systems of accelerator H ion sources are highly specialized utilizing magnetic and electric fields in their low energy beam transport systems to produce direct current, as well as pulsed and/or chopped beams with a variety of time structures. Within this paper, specific ion sources utilized at accelerator laboratories shall be reviewed along with the physics of surface and volume H production in regard to source emittance. Current research trends including aperture modeling, thermal modeling, surface conditioning, and laser diagnostics will also be discussed.

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Section: A Beam Emittancementioning

confidence: 99%

Negative hydrogen ion sources for accelerators

Moehs

Peters

Sherman

2005

IEEE Trans. Plasma Sci.

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“…These include surface plasma sources with magnetron, Penning and surface converter geometries as well as magnetic-multipole volume sources with and without caesium. Reviews of operational ion sources can be found in references [41,42]. J-PARC uses a LaB 6 filament driven caesium free source to produce a 38 mA H − beam with a duty factor of 0.9 % at 50 keV.…”

Section: H − Ion Sources For Particle Acceleratorsmentioning

confidence: 99%

A new extraction system for the Linac4 H−ion source

Midttun

Kalvas

Kronberger

et al. 2012

Review of Scientific Instruments

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As part of the CERN accelerator complex upgrade, a new linear accelerator for H(-) (Linac4) is under construction. The ion source design is based on the non-caesiated DESY RF-driven ion source, with the goal of producing an H(-) beam of 80 mA beam current, 45 keV beam energy, 0.4 ms pulse length, and 2 Hz repetition rate. The source has been successfully commissioned for an extraction voltage of 35 kV, corresponding to the one used at DESY. Increasing the extraction voltage to 45 kV has resulted in frequent high voltage breakdowns in the extraction region caused by evaporating material from the electron dump, triggering a new design of the extraction and electron dumping system. Results of the ion source commissioning at 35 kV are presented as well as simulations of a new pulsed extraction system for beam extraction at 45 kV.

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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%

“…The advent of the Fermilab HINS increases the need for accelerator based H -ion sources to operate reliable with long pulse lengths and high duty factors [3]. To avoid the high operating temperatures and thermal stresses associated with elevated duty factors active cooling of the ion source is necessary.…”

Section: Introductionmentioning

confidence: 99%