Pepperpot emittance measurements of ion beams from an electron beam ion source

Pitters, Johanna; Breitenfeldt, M.; Pinto, S. Duarte; Pahl, Hannes; Pikin, A.; Shornikov, A.; Wenander, F.

doi:10.1016/j.nima.2018.12.072

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…These settings have no impact on the emittance values and each point is obtained with same quad setting and constant beam current intensity. It can be seen in figure 12 that the 2D Gaussian fit gives a more consistent result with reduced fluctuations compared to the linear fitting of rms-emittance and the usual threshold variation algorithm [26]. The 2D Gaussian fit has the advantage that it is less dependent on the offset that some data may have and on the local noise fluctuations.…”

Section: Data Analysis For the Allison Type Emittance Metermentioning

confidence: 90%

Transverse emittance measurement in 2D and 4D performed on a Low Energy Beam Transport line: benchmarking and data analysis

et al. 2023

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2D and 4D transverse phase-space of a low-energy ion-beam is measured with two of the most common emittance scanners. The article covers the description of the installation, the setup, the settings, the experiment and the benchmark of the two emittance meters. We compare the results from three series of measurements and present the advantages and drawbacks of the two systems. Coupling between phase-space planes, correlations and mitigation of deleterious effects are discussed. The influence of background noise and aberrations of trace-space figures on emittance measurements and RMS calculations is highlighted, especially for low density beams and halos. A new data analysis method using noise reduction, filtering, and reconstruction of the emittance figure is described. Finally, some basic concepts of phase-space theory and application to beam transport are recalled.

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Section: Data Analysis For the Allison Type Emittance Metermentioning

confidence: 90%

Transverse emittance measurement in 2D and 4D performed on a Low Energy Beam Transport line: benchmarking and data analysis

et al. 2023

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“…The image of the pepper-pot device generated by an MCP and phosphor screen contains not only signals created by charged beams but also background noise which stems from the dark current of the CMOS sensor, blur characteristics of the phosphor screen, secondary particles scattered at the mask, and ambient light partially reflected by metallic surfaces of surrounding structures. Several previous image processing studies were performed without proper background noise rejection [22], [23], [24], [25]. The noise that is not cleanly removed causes inaccurate results of the phase-space distribution of the beam as it is considered as the beam signal during the reconstruction stage.…”

Section: Image Processing and Noise Filteringmentioning

confidence: 99%

Design and Experimental Validation of High-Resolution Single-Shot Emittance Diagnostics for Heavy-Ion Beams

Hahn

Yang

You

et al. 2021

IEEE Trans. Instrum. Meas.

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A pepper-pot diagnostic device was developed to accurately and robustly retrieve particle distribution in horizontal and vertical phase spaces by single-shot emittance measurements. Two masks that differ in both composition and manufacturing method were fabricated: one made of phosphor bronze by an optical lithography process, and another made of stainless steel (SUS) by laser cutting. Scanning electron microscope measurements of the two masks revealed that the former is superior in terms of regularity and shape of the mask holes and is therefore more suitable to use. A new image-processing algorithm, namely the cluster noise removal method, was developed which improves the resolution of the phase-space distribution measurements over traditional methods. The device was tested in experiments with low-energy argon beams generated by an ECR ion source at KFE. Results show that the diagnostics can robustly and reliably retrieve the four-dimensional phase-space distribution of ion beams with a single-shot measurement.

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“…The pepper-pot method was originally proposed as a method to measure the beam emittance and is constructed with a pepper-pot plate and a position-sensitive detector [38,39]. Although many methods have been developed including the quadrupole scan and the optical diffraction/transition radiation interference contrast, the pepperpot method remains a powerful technique applied for phase space structure measurements [40][41][42][43][44].…”

Section: Pepper-pot-type Phase Space Analyser (Ppsa)mentioning

confidence: 99%

Characterisation of negative ion beam focusing based on phase space structure

et al. 2020

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Negative ion beam focusing is a key element for advanced applications of negative ion beams such as accelerators for particle physics, compact accelerators for medical fields, and plasma experiments for nuclear fusion because complicated magnetic fields exist both inside of the source plasma and the grid system. In order to understand the beam focusing, phase space structure measurements for a single beamlet have been performed with a research-and-development negative ion source at the National Institute for Fusion Science. A complicated phase space structure is observed in the direction parallel to the filter magnetic field in the vicinity of the plasma grid, while a single-Gaussian beamlet structure is observed in the direction perpendicular to the filter field. Detailed analyses for the phase space structure of the single beamlet reveal that the complicated structure can be identified as a combination of three beam components with different beam axes. The shifts of each axis are also observed to depend on the ratio of the acceleration voltage for the extraction voltage, which may significantly degrade the beamlet focusing.

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Pepperpot emittance measurements of ion beams from an electron beam ion source

Cited by 8 publications

References 9 publications

Transverse emittance measurement in 2D and 4D performed on a Low Energy Beam Transport line: benchmarking and data analysis

Transverse emittance measurement in 2D and 4D performed on a Low Energy Beam Transport line: benchmarking and data analysis

Design and Experimental Validation of High-Resolution Single-Shot Emittance Diagnostics for Heavy-Ion Beams

Characterisation of negative ion beam focusing based on phase space structure

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