Laserwire at the Accelerator Test Facility 2 with submicrometer resolution

Nevay, Laurence; Boogert, Stewart; Karataev, P.; Kruchinin, Konstantin; Corner, L.; Howell, D. F.; Walczak, R.; Aryshev, Alexander; Urakawa, J.; Terunuma, N.

doi:10.1103/physrevstab.17.072802

Cited by 7 publications

(14 citation statements)

References 17 publications

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“…Investigation on LSS is also motivated by the creation of intense polarized positron sources for e − -e þ colliders [13], and by the promise owing to modern technologies of high gradient, advanced accelerator concepts, including precise sub-μm e-beam tuning and measurements, uniquely enabled by employing the so-termed laser Thomson wire scanner [14]. Finally, at the highest energies (GeV to TeV), the concept of e-γ and γ-γ collider will provide precious experimental opportunities of direct matter production from photon field [15], thus improve the measurements noise and the energy spread and so the mass resolution.…”

Section: Introductionmentioning

confidence: 99%

Observation of redshifting and harmonic radiation in inverse Compton scattering

Sakai

Pogorelsky

Williams

et al. 2015

Phys. Rev. ST Accel. Beams

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Inverse Compton scattering of laser photons by ultrarelativistic electron beam provides polarized x-to γ-ray pulses due to the Doppler blueshifting. Nonlinear electrodynamics in the relativistically intense linearly polarized laser field changes the radiation kinetics established during the Compton interaction. These are due to the induced figure-8 motion, which introduces an overall redshift in the radiation spectrum, with the concomitant emission of higher order harmonics. To experimentally analyze the strong field physics associated with the nonlinear electron-laser interaction, clear modifications to the angular and wavelength distributions of x rays are observed. The relativistic photon wave field is provided by the ps CO 2 laser of peak normalized vector potential of 0.5 < a L < 0.7, which due to the quadratic dependence of the strength of nonlinear phenomena on a L permits sufficient effects not observed in past 2nd harmonic study with a L ≈ 0.3 laser [M. Babzien et al., Phys. Rev. Lett. 96, 054802 (2006)]. The angular spectral characteristics are revealed using K-, L-edge, and high energy attenuation filters. The observation indicates existence of the electrons' longitudinal motion through frequency redshifting understood as the mass shift effect. Thus, the 3rd harmonic radiation has been observed containing on-axis x-ray component that is directly associated with the induced figure-8 motion. These are further supported by an initial evidence of off-axis 2nd harmonic radiation produced in a circularly polarized laser wave field. Total x-ray photon number per pulse, scattered by 65 MeV electron beam of 0.3 nC, at the interaction point is measured to be approximately 10 9 .

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Section: Introductionmentioning

confidence: 99%

Observation of redshifting and harmonic radiation in inverse Compton scattering

Sakai

Pogorelsky

Williams

et al. 2015

Phys. Rev. ST Accel. Beams

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“…With the electron beam sizes mentioned, the reduced Rayleigh range is still over double the width of the electron beam. Even when present, such effects do not preclude the use of a laserwire as has been recently shown [25].…”

Section: Application As a Laserwirementioning

confidence: 90%

“…The standard deviation of the centroid was measured over a 20 min period to be 3.820 μm, which corresponds to an angular jitter of 1.09 AE 0.03 μrad. For a laserwire system at a distance of 20 m [25] producing a 1 μm focused spot size using this laser beam, the spatial jitter at the focus would be < 10 nm. When convolved with the laserwire scan this contribution would be negligible.…”

Section: Pulse Numbermentioning

confidence: 99%

“…In these cases, the low repetition rate and low average laser power respectively preclude fast intratrain scanning as would be required at the ILC. Another laserwire installation at the linear extraction line of Accelerator Test Facility 2 has shown micrometer-sized scans using a gigawatt peak power Q-switched pulsed laser at 3.25 Hz [11]. Despite the high resolution and signal level at this installation, the low repetition rate of the laser system also prevents intratrain scanning.…”

Section: Introductionmentioning

confidence: 99%

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High power fiber laser system for a high repetition rate laserwire

Nevay

Walczak

Corner

2014

Phys. Rev. ST Accel. Beams

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We present the development of a high power fiber laser system to investigate its suitability for use in a transverse electron beam profile monitor, i.e., a laserwire. A system capable of producing individual pulses up to 165.8 AE 0.4 μJ at 1036 nm with a full width at half maximum of 1.92 AE 0.12 ps at 6.49 MHz is demonstrated using a master oscillator power amplifier design with a final amplification stage in a rod-type photonic crystal fiber. The pulses are produced in trains of 1 ms in a novel burst mode amplification scheme to match the bunch pattern of the charged particles in an accelerator. This method allows pulse energies up to an order of magnitude greater than the steady-state value of 17.0 AE 0.6 μJ to be achieved at the beginning of the burst with a demonstrated peak power of 25.8 AE 1.7 MW after compression. The system is also shown to demonstrate excellent spatial quality with an M 2 ¼ 1.26 AE 0.01 in both dimensions, which would allow nearly diffraction limited focusing to be achieved.

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“…For this reason, noninvasive techniques are required in colliders or in any accelerator with a very intense beam. The state of the art in noninvasive (i.e., techniques that do not perturbing the particle beam to be measured, or do so minimally) transverse-beam-profile and emittance diagnostics for ultrarelativistic electron and positron beams is based on the so-called laser-wire technique [11][12][13], where a thin laser beam is scanned across a particle beam and inverse-scattered photons are registered downstream. This technique requires an expensive laser, sophisticated final focus optics, and a team of experts to operate the system.…”

Section: Introductionmentioning

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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Laserwire at the Accelerator Test Facility 2 with submicrometer resolution

Cited by 7 publications

References 17 publications

Observation of redshifting and harmonic radiation in inverse Compton scattering

Observation of redshifting and harmonic radiation in inverse Compton scattering

High power fiber laser system for a high repetition rate laserwire

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

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