Calibration and cross-laboratory implementation of scintillating screens for electron bunch charge determination

Kurz, Thomas; Couperus, Jurjen; Krämer, J.M.; Ding, Hao; Kuschel, S.; Köhler, A.; Zarini, Omid; Hollatz, D.; Schinkel, David; D’Arcy, Richard; Schwinkendorf, Jan-Patrick; Osterhoff, Jens; Irman, Arie; Schramm, U.; Karsch, Stefan

doi:10.1063/1.5041755

Cited by 48 publications

(44 citation statements)

References 24 publications

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“…During the change of the charge settings the screens were given a few minutes to recover. Throughout the investigation a continuous reduction in light yield of up to about 15% was observed, similar to other scintillation screens [1]. For further investigation, additional long-term stability measurements independent from the charge calibration were performed.…”

Section: Degradationsupporting

confidence: 68%

Charge calibration of DRZ scintillation phosphor screens

et al. 2019

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As a basic diagnostic tool, scintillation screens are employed in particle accelerators to detect charged particles. In extension to the recent revision on the calibration of scintillation screens commonly applied in the context of plasma acceleration [T. Kurz et al., Rev. Sci. Instrum. 89 (2018) 093303], here we present the charge calibration of three DRZ screens (Std, Plus, High), which promise to offer similar spatial resolution to other screen types whilst reaching higher conversion efficiencies. The calibration was performed at the Electron Linac for beams with high Brilliance and low Emittance (ELBE) at the Helmholtz-Zentrum Dresden-Rossendorf, which delivers picosecondlong beams of up to 40 MeV energy. Compared to the most sensitive screen, Kodak BioMAX MS, of the aforementioned recent investigation by Kurz et al., the sample with highest yield in this campaign, DRZ High, revealed a 30% increase in light yield. The detection threshold with these screens was found to be below 10 pC/mm 2. For higher charge-densities (several nC/mm 2) saturation effects were observed. In contrast to the recent reported work, the DRZ screens were more robust, demonstrating higher durability under the same high level of charge deposition.

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Section: Degradationsupporting

confidence: 68%

Charge calibration of DRZ scintillation phosphor screens

et al. 2019

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“…S4 in Supplemental Material [51]). The spectral distribution of the laser-accelerated electron bunch is characterized using a magnet spectrometer, and the spectral charge density is measured by an absolutely calibrated scintillating screen [71]. Further details on all experiments are given in Supplemental Material [51] (cf.…”

Section: High-charge Electron Beams From Shock-front Injectionmentioning

confidence: 99%

Physics of High-Charge Electron Beams in Laser-Plasma Wakefields

et al. 2020

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Laser wakefield acceleration (LWFA) and its particle-driven counterpart, particle or plasma wakefield acceleration (PWFA), are commonly treated as separate, though related, branches of high-gradient plasmabased acceleration. However, novel proposed schemes are increasingly residing at the interface of both concepts where the understanding of their interplay becomes crucial. Here, we present a comprehensive study of this regime, which we may term laser-plasma wakefields. Using datasets of hundreds of shots, we demonstrate the influence of beam loading on the spectral shape of electron bunches. Similar results are obtained using both 100-TW-class and few-cycle lasers, highlighting the scale invariance of the involved physical processes. Furthermore, we probe the interplay of dual electron bunches in the same or in two subsequent plasma periods under the influence of beam loading. We show that, with decreasing laser intensity, beam loading transitions to a beam-dominated regime, where the first bunch acts as the main driver of the wakefield. This transition is evidenced experimentally by a varying acceleration of a lowenergy witness beam with respect to the charge of a high-energy drive beam in a spatially separate gas target. Our results also present an important step in the development of LWFA using controlled injection in a shock front. The electron beams in this study reach record performance in terms of laser-to-beam energy transfer efficiency (up to 10%), spectral charge density (regularly exceeding 10 pC MeV −1), and angular charge density (beyond 300 pC μsr −1 at 220 MeV). We provide an experimental scaling for the accelerated charge per terawatt (TW) of laser power, which approaches 2 nC at 300 TW. With the expanding availability of petawatt-class (PW) lasers, these beam parameters will become widely accessible. Thus, the physics of laser-plasma wakefields is expected to become increasingly relevant, as it provides new paths toward low-emittance beam generation for future plasma-based colliders or light sources.

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“…In order to estimate the energy of the dispersed electron beams, knowledge of the undeflected path is required, which was obtained from the correlation between the electron beam pointing (recorded without a magnet) on two phosphor screens (phosphor 1 and phosphor 2). The electron beam charge was estimated using standard calibration data available for the various phosphor screens used [33][34][35].…”

Section: Experimental Setup and Generationmentioning

confidence: 99%

Electron radiography with different beam parameters using laser plasma accelerator

Hazra

Mishra

Moorti

et al. 2019

Phys. Rev. Accel. Beams

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An experimental study on the radiography of various metallic and biological plant samples with a minimum resolution of ∼75 μm using relativistic electron beams from the laser plasma accelerator is presented. Electron beams were generated from the interaction of Ti:sapphire laser pulses of 120 fs duration with underdense plasma of 4 mm length, created using Ar and He gas jets, with two different parameters, i.e., a maximum energy of ∼50 MeV (broad spectrum) and a quasimonoenergetic beam with a peak energy of ∼150 MeV. GEANT4 Monte Carlo simulations were performed to reconstruct the radiographic images and were found to be consistent with the experimental results. Radiography of biological plant samples was also performed, and in this regard penetration depths of two types of electron beams in adipose tissue were estimated through a simulation. The effect of different electron beam parameters on the quality of the radiograph has been discussed.

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Calibration and cross-laboratory implementation of scintillating screens for electron bunch charge determination

Cited by 48 publications

References 24 publications

Charge calibration of DRZ scintillation phosphor screens

Charge calibration of DRZ scintillation phosphor screens

Physics of High-Charge Electron Beams in Laser-Plasma Wakefields

Electron radiography with different beam parameters using laser plasma accelerator

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