Beam-Size Measurement with Optical Diffraction Radiation at KEK Accelerator Test Facility

Karataev, P.; Araki, S.; Hamatsu, R.; Hayano, H.; Muto, T.; Naumenko, G. A.; Потылицын, А. П.; Terunuma, N.; Urakawa, J.

doi:10.1103/physrevlett.93.244802

Cited by 75 publications

(81 citation statements)

References 4 publications

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“…These effects are often partially obscured by beam-offset and beam-divergence contributions. More recently, an unusually low-divergence beam ( 1:5 rad) allowed ODR far-field data from a slit aperture to be analyzed for beam-size effects [13]. These data were obtained via a scanning-mirror plus detector geometry, but the scan took ten minutes.…”

Section: Introductionmentioning

confidence: 99%

Near-field imaging of optical diffraction radiation generated by a 7-GeV electron beam

Lumpkin

Berg

Sereno

et al. 2007

Phys. Rev. ST Accel. Beams

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We report the first unambiguous demonstration of near-field imaging of optical diffraction radiation (ODR). The source of the ODR was an aluminum metal reflective surface with a 7-GeV electron beam passing nearby its single edge. Because of the high Lorentz factor involved, appreciable ODR is emitted at visible wavelengths even for impact parameters of 1 to 2 mm, so standard imaging techniques were employed. The experimental results are compared to a simple near-field model. We show that the ODR signals are sensitive to both beam size and position. Applications to multi-GeV beams in transport lines in the major synchrotron radiation facilities, x-ray free-electron lasers, energy recovering linacs, and the International Linear Collider are possible.

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Section: Introductionmentioning

confidence: 99%

Near-field imaging of optical diffraction radiation generated by a 7-GeV electron beam

Lumpkin

Berg

Sereno

et al. 2007

Phys. Rev. ST Accel. Beams

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“…10). The knife edge was fabricated from a 300 m thick single crystal of silicon using etch and mask and then coated with gold [2].…”

Section: Interaction Chambermentioning

confidence: 99%

“…The normal techniques of beam size measurement, for example, wire scanners and screens which intersect the charged particle beam, are not applicable when the bunch charge density is sufficiently large to damage the material placed in the beam. In these scenarios noninvasive techniques must be used such as optical diffraction radiation [2] or methods based on laser interactions with electron beams. A review of beam size measurement of electron beams can be found in [3].…”

Section: Introductionmentioning

confidence: 99%

Micron-scale laser-wire scanner for the KEK Accelerator Test Facility extraction line

Boogert

Blair

Boorman

et al. 2010

Phys. Rev. ST Accel. Beams

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A laser-wire transverse electron beam size measurement system has been constructed and operated at the Accelerator Test Facility (ATF) extraction line at KEK. The construction of the system is described in detail along with the environment of the ATF related to the laser wire. A special set of electron beam optics was developed to generate an approximately 1 m vertical focus at the laser-wire location. The results of our operation at the ATF extraction line are presented, where a minimum rms electron beam size of 4:8 AE 0:3 m was measured, and smaller electron beam sizes can be measured by developing the method further. The beam size at the laser-wire location was changed using quadrupoles and the resulting electron beam size measured, and vertical emittance extracted.

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“…The first application of this technique to the particle beam diagnostics has been performed at ATF (KEK) ( [3], [4], [5]). …”

Section: Introductionmentioning

confidence: 99%

Non-intercepting diagnostic for high brightness electron beams using Optical Diffraction Radiation Interference (ODRI)

Cianchi¹,

Balandin²,

Castellano³

et al. 2012

J. Phys.: Conf. Ser.

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First non-intercepting emittance measurement by means of optical diffraction radiation interference A Cianchi, V Balandin, M Castellano et al.-PIC code KARAT simulation of different types of polarization radiation generated by relativistic electron beam K P Artyomov, V V Ryzhov, G A Naumenko et al.-"Shadowing" of the electromagnetic field of relativistic charged particles G Naumenko, X Artru, A Potylitsyn et al. Abstract. High-gain Free Electron Lasers and future Linear Colliders require development of modern electron linacs with high brightness beams. Conventional intercepting transverse electron beam diagnostics, e.g. based on Optical Transition Radiation (OTR), cannot tolerate such high power beams without remarkable mechanical damages on the diagnostics device. Optical Diffraction Radiation (ODR) is an excellent candidate for measurements of the transverse phase space parameters in a non-intercepting way. One of the main problems of this method is the low signal to noise ratio, mainly due to the unavoidable synchrotron radiation background. This problem can be overcome by using two slits on metallic foils, placed at a distance shorter than the radiation formation zone. In this case a nearly backgroundfree ODR interference pattern is produced allowing the determination of the beam size and angular divergence. The accuracy on these parameters can be increased by exploiting both ODR polarization states, as well as different wavelengths. Here we report measurements of the ODR interference between two slits with different aperture sizes in a non-collinear geometry, carried out at FLASH (DESY, Germany). Our results demonstrate the unique potential of this technique to determine the beam parameters.

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Beam-Size Measurement with Optical Diffraction Radiation at KEK Accelerator Test Facility

Cited by 75 publications

References 4 publications

Near-field imaging of optical diffraction radiation generated by a 7-GeV electron beam

Near-field imaging of optical diffraction radiation generated by a 7-GeV electron beam

Micron-scale laser-wire scanner for the KEK Accelerator Test Facility extraction line

Non-intercepting diagnostic for high brightness electron beams using Optical Diffraction Radiation Interference (ODRI)

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