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

Abstract

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.

Sub-micron scale transverse electron beam size diagnostics methodology based on the analysis of optical transition radiation source distribution

“…We have also demonstrated extremely low emittance which was consistent with laser wire measurements. Current methodology has been applied to verify e-beam optics at ATF2 facility for laser-wire experiment [8] and calibrate non-invasive Optical Diffraction Radiation monitor [20]. In order to improve the beam size measurement technique additional efforts toward the optimisation of the optical system, e.g.…”

“…At larger observation angles (e.g. 140 degrees) [20] the procedure shown in figure 10 should be used.…”

Longitudinal coupling impedance of a particle traveling in PEC rings: A regularised analysis

“…The accurate analysis of the interaction between charged particles and conducting structures has recently received a renewed attention in the framework of non-invasive beam diagnostics [19][20][21][22][23][24][25][26][27]. Roughly speaking, optical diffraction radiation is characterised by a continuous spectral-angular distribution, which bears information about different beam parameters such as position, size, divergence and energy.…”

One‐Piece Stainless‐Steel 3D Printed Minichannel Evaporators using Flow Boiling Carbon Dioxide

“…From bionic approaches to the validation of new theories in particle physics, the new challenges of climate change mitigation, sustainability, and science currently strongly trigger innovation and creativity in thermal engineering , . In this regard, refrigeration using flow boiling carbon dioxide (CO 2 or R744 according to the ASHRAE Standard Designation) in small‐diameter tube channels is a well‐established technique for the cooling of particle detectors used in high‐energy physics.…”