Absolute calibration of imaging plate for GeV electrons

Nakanii, Nobuhiko; Kondo, Kiminori; Yabuuchi, T.; Tsuji, K.; Tanaka, K. A.; Suzuki, Shinsuke; Asaka, T.; Yanagida, K.; Hanaki, H.; Kobayashi, Toshiaki; Makino, Koji; Yamane, Takahisa; Miyamoto, Shuji; Horikawa, Ken

doi:10.1063/1.2940217

Cited by 23 publications

(16 citation statements)

References 15 publications

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“…Since the previously explored energy range was small enough for the difference to be within the measurement error, the observed energy dependence is not contradictory to previous works. Although the material used was different, it is noteworthy that the IP showed similar energy dependence [29,30], where the sensitivity of IP decreased $4% per 100 MeV increase of the energy.…”

Section: B Resultsmentioning

confidence: 99%

“…By using monoenergetic e-beams from RFAs, the signal of the IP against relativistic electrons up to 1 GeV of electron energy was experimentally calibrated against the e-beam charge measured by a Rogowsky coil or current transformer [29,30]. The range of applicable charge density was extensively studied with 40 MeV e-beams from an RFA [31] using an ICT and Faraday cup measurements for reference.…”

Section: Introductionmentioning

confidence: 99%

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Electron beam charge diagnostics for laser plasma accelerators

Nakamura

Gonsalves

Lin

et al. 2011

Phys. Rev. ST Accel. Beams

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A comprehensive study of charge diagnostics is conducted to verify their validity for measuring electron beams produced by laser plasma accelerators (LPAs). First, a scintillating screen (Lanex) was extensively studied using subnanosecond electron beams from the Advanced Light Source booster synchrotron, at the Lawrence Berkeley National Laboratory. The Lanex was cross calibrated with an integrating current transformer (ICT) for up to the electron energy of 1.5 GeV, and the linear response of the screen was confirmed for charge density and intensity up to 160 pC=mm 2 and 0:4 pC=ðps mm 2 Þ, respectively. After the radio-frequency accelerator based cross calibration, a series of measurements was conducted using electron beams from an LPA. Cross calibrations were carried out using an activationbased measurement that is immune to electromagnetic pulse noise, ICT, and Lanex. The diagnostics agreed within AE8%, showing that they all can provide accurate charge measurements for LPAs.

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Section: B Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electron beam charge diagnostics for laser plasma accelerators

Nakamura

Gonsalves

Lin

et al. 2011

Phys. Rev. ST Accel. Beams

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“…Repeated scans were performed to reduce and finally remove saturation when it was present; a saturation factor was then computed by comparing the PSL drop between the first and the last scan for commensurate unsaturated regions in the two scans; this factor was applied to the PSL from the unsaturated image. To convert PSL to charge, weighted fits to published sensitivity (PSL/electron) measurements373839 yielded sensitivity as a function of energy. Light from the LANEX phosphor screen and the plastic scintillator (ELJEN Technology, EJ-200) were focused onto a colour charge-coupled device (CCD) camera (Basler, scA 1600-14fc).…”

Section: Methodsmentioning

confidence: 99%

Quasi-monoenergetic laser-plasma acceleration of electrons to 2 GeV

et al. 2013

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Laser-plasma accelerators of only a centimetre’s length have produced nearly monoenergetic electron bunches with energy as high as 1 GeV. Scaling these compact accelerators to multi-gigaelectronvolt energy would open the prospect of building X-ray free-electron lasers and linear colliders hundreds of times smaller than conventional facilities, but the 1 GeV barrier has so far proven insurmountable. Here, by applying new petawatt laser technology, we produce electron bunches with a spectrum prominently peaked at 2 GeV with only a few per cent energy spread and unprecedented sub-milliradian divergence. Petawatt pulses inject ambient plasma electrons into the laser-driven accelerator at much lower density than was previously possible, thereby overcoming the principal physical barriers to multi-gigaelectronvolt acceleration: dephasing between laser-driven wake and accelerating electrons and laser pulse erosion. Simulations indicate that with improvements in the laser-pulse focus quality, acceleration to nearly 10 GeV should be possible with the available pulse energy.

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“…This setup provided a total error in energy of 2.5% at 500 MeV. The published calibration of the image plate's photostimulated luminescence provided information on the electron beam charge and the betatron photon flux (33,34). Various filters (1.5-mm-thick Bewindow, 30-μm Al foils, 350-μm-thick image plate, and 55-cm air) between the gas jet and image plate 3 allowed the detection of X-ray photons of >7 keV in energy.…”

Section: Methodsmentioning

confidence: 99%

Concurrence of monoenergetic electron beams and bright X-rays from an evolving laser-plasma bubble

Yan

Chen

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Desktop laser plasma acceleration has proven to be able to generate gigaelectronvolt-level quasi-monoenergetic electron beams. Moreover, such electron beams can oscillate transversely (wiggling motion) in the laser-produced plasma bubble/channel and emit collimated ultrashort X-ray flashes known as betatron radiation with photon energy ranging from kiloelectronvolts to megaelectronvolts. This implies that usually one cannot obtain bright betatron X-rays and high-quality electron beams with low emittance and small energy spread simultaneously in the same accelerating wave bucket. Here, we report the first (to our knowledge) experimental observation of two distinct electron bunches in a single laser shot, one featured with quasi-monoenergetic spectrum and another with continuous spectrum along with large emittance. The latter is able to generate high-flux betatron X-rays. Such is observed only when the laser self-guiding is extended over 4 mm at a fixed plasma density (4 × 10 18 cm −3 ). Numerical simulation reveals that two bunches of electrons are injected at different stages due to the bubble evolution. The first bunch is injected at the beginning to form a stable quasi-monoenergetic electron beam, whereas the second one is injected later due to the oscillation of the bubble size as a result of the change of the laser spot size during the propagation. Due to the inherent temporal synchronization, this unique electron-photon source can be ideal for pump-probe applications with femtosecond time resolution.S ynchrotron light sources are powerful in generating bright X-rays for a wide range of applications in basic science, medicine, and industry (1). However, these machines are usually large in size and expensive for construction and maintenance and are thus unaffordable to many would-be users. With the advent of tabletop ultrashort and ultraintense lasers, laser plasma acceleration (LPA) proposed by Tajima and Dawson (2) has demonstrated its great potential as a compact accelerator and X-ray source. Significant progress in LPA was made in the last decade (3-11): Well-collimated (approximately millirad) quasi-monoenergetic electron beams were first observed in 2004, and the electron energy above gigaelectronvolts over centimeter-scale acceleration lengths were demonstrated in several laboratories in the last few years.While accelerating longitudinally in the laser wakefield, the electron beams also oscillate transversally (wiggling motion) due to the transverse structure of the wakefield, which emits wellcollimated betatron X-rays (12-14). Among several mechanisms to generate X-ray radiation from laser-plasma interactions (15-20), betatron radiation is straightforward and able to deliver larger X-ray photon fluxes per shot [∼10 8 phs/shot (21)] and higher photon energies [up to gamma rays (22)]. The betatron oscillation frequency is given by ω β = ω p (2γ) −1/2 , where ω p is the plasma frequency and γ is the Lorentz factor of the accelerated electron beam. For large-amplitude betatron oscillations (i.e., a few mi...

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Absolute calibration of imaging plate for GeV electrons

Cited by 23 publications

References 15 publications

Electron beam charge diagnostics for laser plasma accelerators

Electron beam charge diagnostics for laser plasma accelerators

Quasi-monoenergetic laser-plasma acceleration of electrons to 2 GeV

Concurrence of monoenergetic electron beams and bright X-rays from an evolving laser-plasma bubble

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