The CLEAR user facility at CERN

Gamba, Davide; Corsini, R.; Curt, Stephane; Doebert, S.; Farabolini, Wilfrid; McMonagle, Gerard; Skowroński, Piotr; Tecker, F.; Zeeshan, Sumaira; Adli, E.; Lindstrøm, C. A.; Ross, A. J.; Wroe, Laurence

doi:10.1016/j.nima.2017.11.080

Cited by 36 publications

(32 citation statements)

References 6 publications

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“…In this Letter, we show that this aberration can be fully suppressed by changing from a light gas species (helium) to a heavier gas species (argon). This discovery was made possible by the first complete characterization of the radial magnetic field distribution in an APL, in an experiment performed at the CERN Linear Electron Accelerator for Research (CLEAR) User Facility [19,20].…”

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confidence: 99%

Emittance Preservation in an Aberration-Free Active Plasma Lens

et al. 2018

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Active plasma lensing is a compact technology for strong focusing of charged particle beams, which has gained considerable interest for use in novel accelerator schemes. While providing kT/m focusing gradients, active plasma lenses can have aberrations caused by a radially nonuniform plasma temperature profile, leading to degradation of the beam quality. We present the first direct measurement of this aberration, consistent with theory, and show that it can be fully suppressed by changing from a light gas species (helium) to a heavier gas species (argon). Based on this result, we demonstrate emittance preservation for an electron beam focused by an argon-filled active plasma lens.

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confidence: 99%

Emittance Preservation in an Aberration-Free Active Plasma Lens

et al. 2018

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“…Currently there are no radiobiological data available evaluating efficacy of VHEEs for radiotherapy applications. However, there are a number of research facilities [17][18][19][20] enabling access to these beams, paving the way for development of radiobiological and pre-clinical programs for VHEEs and their applicability to FLASH. Recently, a possible clinical VHEE delivery system is being developed by a team at the SLAC National Accelerator Laboratory, known as "PHASER" 21 .…”

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The challenge of ionisation chamber dosimetry in ultra-short pulsed high dose-rate Very High Energy Electron beams

McManus

Romano

Lee

et al. 2020

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High dose-rate radiotherapy, known as FLASH, has been shown to increase the differential response between healthy and tumour tissue. Moreover, Very High Energy Electrons (VHEEs) provide more favourable dose distributions than conventional radiotherapy electron and photon beams. Planeparallel ionisation chambers are the recommended secondary standard systems for clinical reference dosimetry of electrons, therefore chamber response to these high energy and high dose-per-pulse beams must be well understood. Graphite calorimetry, the UK primary standard, has been employed to measure the dose delivered from a 200 MeV pulsed electron beam. This was compared to the charge measurements of a plane-parallel ionisation chamber to determine the absolute collection efficiency and infer the ion recombination factor. the dose-per-pulse measured by the calorimeter ranged between 0.03 Gy/pulse and 5.26 Gy/pulse, corresponding to collection efficiencies between 97% and 4%, respectively. Multiple recombination models currently available have been compared with experimental results. This work is directly applicable to the development of standard dosimetry protocols for VHEE radiotherapy, FLASH radiotherapy and other high dose-rate modalities. However, the use of secondary standard ionisation chambers for the dosimetry of high dose-per-pulse VHEEs has been shown to require large corrections for charge collection inefficiency.

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“…The aim of this section is to validate numerically the model proposed in section "Methods", by exploiting the parameters of the machine CERN Linear Electron Accelerator for Research (CLEAR) 11 . Several simulations were carried out by scanning the focal length of the quadrupole.…”

Section: Validation Using Tracking Simulationsmentioning

confidence: 99%

Enhancing particle bunch-length measurements based on Radio Frequency Deflector by the use of focusing elements

Arpaïa

Corsini

Gilardi

et al. 2020

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A method to monitor the length of a particle bunch, based on the combination of a Radio frequency Deflector (RFD) with magnetic focusing elements, is presented. With respect to state-of-the-art bunch length measurement, the additional focusing element allows to measure also the correlations between the longitudinal and transverse planes in terms of both position and divergence. furthermore, the quadrupole-based focusing increases the input dynamic range of the measurement system (i.e. allows for a larger range of beam Twiss parameters at the entrance of the RFD). Thus, measurement resolution and precision are enhanced, by simultaneously preserving the accuracy. In this paper, the method is first introduced analytically, and then validated in simulation, by the reference tool eLectron Generation And tracking, eLeGAnt. finally, a preliminary experimental validation at CLEAR (CERN Linear Electron Accelerator for Research) is reported.

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The CLEAR user facility at CERN

Cited by 36 publications

References 6 publications

Emittance Preservation in an Aberration-Free Active Plasma Lens

Emittance Preservation in an Aberration-Free Active Plasma Lens

The challenge of ionisation chamber dosimetry in ultra-short pulsed high dose-rate Very High Energy Electron beams

Enhancing particle bunch-length measurements based on Radio Frequency Deflector by the use of focusing elements

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