Optical diffraction radiation for position monitoring of charged particle beams

Kieffer, R.; Bravin, E.; Lefèvre, T.; Mazzoni, Stefano; Bergamaschi, M.; Karataev, P.; Kruchinin, Konstantin; Billing, M.; Conway, Joseph; Shanks, James; Terunuma, N.; Bobb, Lorraine

doi:10.1016/j.nimb.2017.03.089

Cited by 4 publications

(8 citation statements)

References 6 publications

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“…Furthermore, the setup is designed to allow both imaging of the target and recording of the angular distribution of the radiation to be done at the same time [28]. The imaging line (i) is used to center the target on the beam, and can be used as an optical beam position monitor (BPM), with the beam position deduced from the intensity imbalance between the two slit edges [29].…”

Section: A Overviewmentioning

confidence: 99%

Noninvasive Micrometer-Scale Particle-Beam Size Measurement Using Optical Diffraction Radiation in the Ultraviolet Wavelength Range

et al. 2020

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We present recent achievements in the application of optical diffraction radiation (ODR) to the measurement of the transverse beam size of a 1.3 GeV micrometer-size electron beam performed with an instrument installed in the extended extraction line of the KEK Accelerator Test Facility. ODR is a recent technique for the measurement of the transverse size and emittance of highly relativistic particle beams. ODR has the advantage of being a noninvasive and relatively inexpensive technique and is a candidate for the operation of linear particle accelerators, where no simple alternatives (e.g., synchrotron radiation) are available. In an effort to improve the resolution and performance, we establish an alternative target microfabrication technology, adopt solutions to improve the signal-to-noise ratio, and perform an experiment in the UV spectrum at 250 nm. With such a configuration, a transverse beam size as low as 3 μm is measured, drastically improving on past measurements reported in the literature. In light of these results, ODR, when combined with a high-resolution optical-transition-radiation monitor, represents a credible diagnostics solution for low-emittance high-intensity particle beams.

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Section: A Overviewmentioning

confidence: 99%

Noninvasive Micrometer-Scale Particle-Beam Size Measurement Using Optical Diffraction Radiation in the Ultraviolet Wavelength Range

et al. 2020

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“…Direct imaging of the target surface is used for alignment of the electron beam in the target aperture (see Sec. VI A) and beam position monitoring [27]. In the imaging setup, an achromat doublet lens (AC508-150-A) provided by Thorlabs is inserted into the optical path.…”

Section: Optical Systemmentioning

confidence: 99%

Feasibility of diffraction radiation for noninvasive beam diagnostics as characterized in a storage ring

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Lefèvre

et al. 2018

Phys. Rev. Accel. Beams

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In recent years, there has been an increasing demand for noninvasive beam size monitoring on particle accelerators. Ideally, these monitors should be cost effective and require little or no maintenance. These monitors should also be suitable for both linear and circular machines. Here, the experimental setup is described in detail, and the results from a diffraction radiation beam size monitor are presented. This monitor has been tested on the Cornell Electron Storage Ring using a 1 mA (1.6 × 10 10 particles per bunch) single bunch electron beam at 2.1 GeV energy. Images of the target surface and the angular distribution of the emitted diffraction radiation were acquired at wavelengths of 400 and 600 nm. These measurements are compared to two analytical models.

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“…The spectrum of PR will expand to the near infrared or visible range, for higher particle energies (i.e., γ > 10 3 ) even when using impact parameters larger than a millimeter. In this context, incoherent DR has been studied intensively for the last 10 years and has led to the development of noninterceptive beam size [25] and position [26] monitors by measuring photons emitted from thin slits in the visible range. DR is generated by a charge moving in the vicinity of an interface between two media with different permittivity and is typically emitted both in the forward (i.e., along the particle trajectory) and the backward (i.e., along the specular reflection from the interface) directions.…”

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“…The increase in photon yield is due to the proportional increase of the number of atoms participating in the emission process along the length of the dielectric. Moreover, the Cherenkov photons are emitted at a large angle relative to the particle beam trajectory such that the signal is separated from synchrotron radiation, which is, in the case of DR, the main source of background [25,26].…”

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confidence: 99%

“…As the photons are emitted in a narrow cone centered at a large angle, CDR will provide a great opportunity to develop high-quality and simple noninvasive beam diagnostics for high-energy charged particle beams. The exponential decay of the light emitted for larger impact parameters is a signature of CDR and can provide very sensitive measurements of the beam position, surpassing what has been achieved using optical diffraction radiation [26]. This will find applications for centering beams in dielectric capillaries, which are typically used in DWA [19,20], plasma lenses [33], or in bent-crystal collimators [34].…”

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Direct Observation of Incoherent Cherenkov Diffraction Radiation in the Visible Range

et al. 2018

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We report on the observation of incoherent Cherenkov radiation emitted by a 5.3 GeV positron beam circulating in the Cornell electron-positron storage ring as the beam passes in the close vicinity of the surface of a fused silica radiator (i.e., at a distance larger than 0.8 mm). The shape of the radiator was designed in order to send the Cherenkov photons towards the detector, consisting of a compact optical system equipped with an intensified camera. The optical system allows both the measurements of 2D images and angular distribution including polarization study. The corresponding light intensity has been measured as a function of the distance between the beam and the surface of the radiator and has shown a good agreement with theoretical predictions. For highly relativistic particles, a large amount of incoherent radiation is produced in a wide spectral range. A light yield of 0.8×10^{-3} photon per particle per turn has been measured at a wavelength of 600±10 nm in a 2 cm long radiator and for an impact parameter of 1 mm. This will find applications in accelerators as noninvasive beam diagnostics for both leptons and hadrons.

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Optical diffraction radiation for position monitoring of charged particle beams

Cited by 4 publications

References 6 publications

Noninvasive Micrometer-Scale Particle-Beam Size Measurement Using Optical Diffraction Radiation in the Ultraviolet Wavelength Range

Noninvasive Micrometer-Scale Particle-Beam Size Measurement Using Optical Diffraction Radiation in the Ultraviolet Wavelength Range

Feasibility of diffraction radiation for noninvasive beam diagnostics as characterized in a storage ring

Direct Observation of Incoherent Cherenkov Diffraction Radiation in the Visible Range

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