Beam measurement systems for the CERN antiproton decelerator (AD)

Chohan, V.; Angoletta, M. E.; Ludwig, Michael; Marqversen, O.; Odier, P.; Pedersen, F.; Transquille, G.; Raich, U.; Søby, L.; Spickermann, T.

doi:10.1109/pac.2001.987359

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…In order to measure the emittance at a specific time during the machine's cycle, a scraping device has been successfully employed in the AD [11], from injection energy 2.8 GeV down to an extraction energy of 5.3 MeV. The scraper has been shown to effectively probe these low-energy, low-intensity (N p ≈ 5 × 10 7 ) beam distributions and so was also chosen as the primary emittance diagnostic for ELENA, which has an extraction energy of 100 keV.…”

Section: Introductionmentioning

confidence: 99%

Novel transverse emittance measurements for electron cooling characterization

Hunt

Resta-López

Welsch

et al. 2020

Phys. Rev. Accel. Beams

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The extra low energy antiproton ring (ELENA) finished commissioning before the start of CERN's second long shutdown in December 2018, successfully providing beams to a new experimental zone. In 2021, ELENA will begin distributing cooled 100 keV antiproton beams to all antimatter experiments. To counteract beam blowup due to deceleration, ELENA will employ the use of an electron cooler. Measurements under similar circumstances, such as at the antiproton decelerator at CERN, have shown electron cooling causing non-Gaussian beam profiles. This effect, combined with nonzero dispersion at the location of the scraper in ELENA, presents new challenges in the use of ELENA's scraper to determine the emittance during the deceleration cycle. Two new scraper algorithms have been developed and used to show the first evidence of significant electron cooling in ELENA, at 650 and 100 keV energy plateaus. The algorithms are capable of estimating the longitudinal momentum spread of the beams and accurately determining emittances for non-Gaussian beams in dispersive regions. Additionally, utilizing combinations of measurements from opposing scraper blades, additional information on the beam's evolution is presented, suggesting a correlation between the emittance and longitudinal momentum offset of individual particles. Finally, considerations for further studies in ELENA and similar machines are presented.

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Section: Introductionmentioning

confidence: 99%

Novel transverse emittance measurements for electron cooling characterization

Hunt

Resta-López

Welsch

et al. 2020

Phys. Rev. Accel. Beams

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“…In the AD ring two pairs of horizontal and vertical tungsten scrapers are used to destructively measure the transverse beam profile [3]. The scraper is situated in a dispersive-free region to simplify the reconstruction process.…”

Section: Introductionmentioning

confidence: 99%

Beam Quality Measurements for Low Energy Antiproton Machines

Hunt¹,

Resta-López²,

Welsch³

2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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From 2016 the Extra Low Energy Antiproton (ELENA) ring will allow better quality, higher intensity antiproton beams to reach the experiments at the antimatter facility at CERN. Also currently in development is the Ultra-low energy Storage Ring (USR) at the Facility for Low-energy Antiproton and Ion Research (FLAIR). In order to ensure the experiments receive the best quality beams possible, unique diagnostics systems for these machines must be developed. In this contribution, a system using a scraper for measuring the emittance of beams in next generation low energy antiproton machines is investigated. After developing a working theory, particle tracking using multiple codes is performed to establish a reliable simulation of the scraper in operation. The working scraper model is used to determine how accurately the emittance of the beam can be reconstructed from scraper position and beam intensity measurements. As there is no point of zero dispersion around the ELENA ring, several complications are considered. These include difficulties determining the closed orbit and the effects of a correlation between the emittance and momentum offset. An algorithm employing the best possible method of reconstruction is developed and offered for practical application. Additional effects such as a diffusion process and intrabeam scattering may further complicate the measurement and possible future studies are discussed. Challenges arising from the adaption of the device from ELENA to the USR are considered.

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“…New diagnostic devices [5] have been developed to monitor the beam characteristics like intensity, size and position with as little as 10 7 pbars. At 100 MeV/c this corresponds to a circulating current of only 260 nA which cannot be resolved by a "normal" beam current transformer nor by "straight-forward" Schottky noise diagnostics.…”

Section: Beam Diagnosticsmentioning

confidence: 99%