Negative ion beam space charge compensation by residual gas

Valerio-Lizarraga, C. A.; León‐Monzón, I.; Scrivens, R.

doi:10.1103/physrevstab.18.080101

Cited by 27 publications

(18 citation statements)

References 9 publications

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“…To better understand the remarkable lifetime improvement observed using the biased anode, the anode-cathode gap and a portion of the adjacent beam line were modeled using the ion beam simulator code, IBSIMU [38], which is a powerful suite of libraries based on C++ programming language for low-energy particle tracking in electric and magnetic fields. The open source distribution code has been utilized in the design of ion sources [39,40]. IBSIMU is designed for unbunched (dc) beams only.…”

Section: Ion Production and Its Effect On Photocathode Lifetimementioning

confidence: 99%

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Hernandez‐Garcia

Adderley

Bullard

et al. 2019

Phys. Rev. Accel. Beams

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This contribution describes the latest milestones of a multiyear program to build and operate a compact −300 kV dc high voltage photogun with inverted insulator geometry and alkali-antimonide photocathodes. Photocathode thermal emittance measurements and quantum efficiency charge lifetime measurements at average current up to 4.5 mA are presented, as well as an innovative implementation of ion generation and tracking simulations to explain the benefits of a biased anode to repel beam line ions from the anodecathode gap, to dramatically improve the operating lifetime of the photogun and eliminate the occurrence of micro-arc discharges.

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Section: Ion Production and Its Effect On Photocathode Lifetimementioning

confidence: 99%

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Hernandez‐Garcia

Adderley

Bullard

et al. 2019

Phys. Rev. Accel. Beams

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“…Under the auspices of BEAM three students have obtained a Ph.D. in accelerator sciences. In addition to the work on electron cloud effects, they have also contributed to our current knowledge on Crab cavities [6] and the design and construction of the LINAC4 [7]. Also three students got their M. Sc.…”

Section: The Collaboration With Cernmentioning

confidence: 96%

Creation of a group on particle accelerator science and technology in Mexico

Contreras

Napsuciale

2016

J. Phys.: Conf. Ser.

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“…One can argue that the maximum allowable perveance with lumped focusing corresponds to the case when the minimum practical physical distance between lenses exceeds their length by only a factor of 2-3 (with a factor of '1' meaning that the lenses would be touching). Then, taking a factor of 3 for the lenses' distance-to-length ratio implies _ ≅ 12 (4) and the maximum allowable perveance is…”

Section: Ii1 Linear Space Charge Effectmentioning

confidence: 99%

Low emittance growth in a low energy beam transport line with un-neutralized section

Prost

Carneiro

Shemyakin

2018

Phys. Rev. Accel. Beams

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In a Low Energy Beam Transport line (LEBT), the emittance growth due to the beam's own space charge is typically suppressed by way of neutralization from either electrons or ions, which originate from ionization of the background gas. In cases where the beam is chopped, the neutralization pattern changes throughout the beginning of the pulse, causing the Twiss parameters to differ significantly from their steady state values, which, in turn, may result in beam losses downstream. For a modest beam perveance, there is an alternative solution, in which the beam is kept un-neutralized in the portion of the LEBT that contains the chopper. The emittance can be nearly preserved if the transition to the un-neutralized section occurs where the beam exhibits low transverse tails. This report discusses the experimental realization of such a scheme at Fermilab's PXIE, where low beam emittance dilution was demonstrated.

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Negative ion beam space charge compensation by residual gas

Cited by 27 publications

References 9 publications

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Creation of a group on particle accelerator science and technology in Mexico

Low emittance growth in a low energy beam transport line with un-neutralized section

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