Use of a Minimum-Ellipse Criterion in the Study of Ion-Beam Extraction Systems

Keller, R.; Sherman, J.D.; Allison, P.

doi:10.1109/tns.1985.4333986

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…A method for finding such an ellipse has been described but is not yet incorporated in our code. 5 While we continue to improve our code, we gladly offer assistance and/or training in its use. …”

Section: Discussionmentioning

confidence: 99%

Self-consistent, unbiased root-mean-square emittance analysis

Stöckli

Welton

Keller

2004

Review of Scientific Instruments

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We present a self-consistent method for analyzing measured emittance data that yields unbiased estimates for the root-mean-square ͑rms͒ emittance. The self-consistent, unbiased elliptical exclusion analysis uses an ellipse to determine the bias from the data outside the ellipse, before calculating the rms emittance from the bias-subtracted data within the ellipse. Increasing the ellipse size until the rms emittance estimate saturates allows for determining the minimum elliptical area that includes all real signals, even those buried in the noise. Variations of the ellipse shape and orientations are used to test the robustness of the results. Background fluctuations cause fluctuations in the rms emittance estimate, which are an estimate of the uncertainty incurred through the analysis.

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Section: Discussionmentioning

confidence: 99%

Self-consistent, unbiased root-mean-square emittance analysis

Stöckli

Welton

Keller

2004

Review of Scientific Instruments

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“…Such an analysis can be made either by keeping the acceptance ellipse shape (orientation and aspect ratio) fixed and just scaling the size or by optimizing the ellipse shape to find the largest fraction for each ellipse size separately. 55 The latter method is more recommended as it corresponds better to the practical case where the beam is tuned by focusing elements to match the acceptance of the following accelerator or transport line (see Fig. 7).…”

Section: Reviewmentioning

confidence: 99%

Ion beam intensity and phase space measurement techniques for ion sources

Kalvas

2022

Review of Scientific Instruments

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Ion sources produce beams used in accelerators and other applications. Both development and use of ion sources need beam diagnostics to probe the plasma processes and beam formation for optimization purposes and to produce beam parameters needed for transport tuning. These diagnostics include beam intensity measurements usually carried out with Faraday cups or inductive pickups, magnetic separation, profile measurements with scintillation screens and wires, and phase space measurements with different types of emittance scanners.

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“…The emittance ellipse axes are parallel to x and x ones, the ellipse main semi-axes could be understood as the beam half-size ∆x and beam divergence ∆x . The above denition is stylish, but that of rms emittance given in [23,24] is more useful for numerical simulation purposes…”

Section: Beam Emittancementioning

confidence: 99%

Calculations of Ion Beam Emittance for Hot Cavity Ion Source

Turek

2015

Acta Phys. Pol. A

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Emittance of short-lived nuclide beams produced in hot cavity ion sources is calculated. Inuence of halflife period as well as the average sticking time on beam emittance is under investigation. Two dierent shapes of ionizer cavity are considered: almost fully spherical and hemispherical ones. Changes of beam emittance due to the extraction channel geometry (its diameter and length) are studied. A new concept of scaled eciency (ion source brightness analogon) is introduced in order to compare the two-ion source congurations. Phase space portraits of the extracted beams are presented.

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Use of a Minimum-Ellipse Criterion in the Study of Ion-Beam Extraction Systems

Cited by 10 publications

References 3 publications

Self-consistent, unbiased root-mean-square emittance analysis

Self-consistent, unbiased root-mean-square emittance analysis

Ion beam intensity and phase space measurement techniques for ion sources

Calculations of Ion Beam Emittance for Hot Cavity Ion Source

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