Novel THz radiation source based on compact linear accelerator.

Marie Curie Research Fellow: Konstantin Lekomtsev

Research objectives:

  • to investigate Cherenkov and Smith - Purcell mechanisms for THz radiation generation using EM simulation tools and propose an efficient target configuration and observation geometry;

  • to build a radiation source that provides high peak power levels and based on a compact linear accelerator technology with a fs-duration beam;

  • to evaluate possible applications of the investigated radiation mechanisms for beam position and bunch length diagnostics;

  • to provide knowledge exchange between partner organisations and other interested parties via seminars, satellite and progress meetings, conferences and workshops;

  • to improve public awareness about the ongoing research via outreach activities;

  • to develop project management skills.

Generation of THz radiation from dielectric mm-scale capillaries with reflectors.

Demonstrated that coherent Smith Purcell Radiation, with intensity comparable to that of coherent Transition Radiation, can be generated as a result of introducing a corrugation in a mm-scale dielectric capillary and can be emitted through an outer dielectric boundary not covered by a reflector.

Detailed information on https://doi.org/10.1016/j.nimb.2017.02.058

Laser Undulator Compact X-ray source (KEK LUCX) facility in Japan:

Installation of capillaries in a vacuum chamber at LUCX:

Crosscheck with Transition Radiation for central (zero transverse off-set) and non-central beam propagation; and crosscheck with a PIC simulation:

Drive-Witness acceleration scheme based on corrugated dielectric mm-scale capillary.

An experimental scheme based on a mm-scale corrugated capillary proposed as an accelerator/decelerator with an adjustable wakefield pattern, and was used to study beam dynamics at different transverse beam off-sets.

Detailed information on http://vrws.de/ipac2017/papers/wepva018.pdf

Two bunches were accelerated up to 8 MeV in a 3.6 cell S-band RF gun. The RF gun introduced time – energy correlation in a beam, producing a drive and a witness of slightly different energies. When a beam was dispersed by the bending magnet different time slices were projected to different transverse coordinates on the Yttrium Aluminium Garnet screen.

Capillary structures:

Beam images on the YAG screen for a reference measurement (beam without capillary) and a measurement with a corrugated capillary (off-central beam propagation).

Measurement of acceleration (red filling) and deceleration (green filling) of a witness bunch as a function of the distance between drive and witness bunch.

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng Beam.png r1 manage 559.7 K 25 May 2017 - 12:02 KonstantinLekomtsev  
PNGpng Corrug_manx3500.png r1 manage 475.4 K 25 May 2017 - 12:03 KonstantinLekomtsev  
JPEGjpg Installed_target.jpg r1 manage 794.6 K 24 May 2017 - 13:24 KonstantinLekomtsev  
PNGpng LUCX_scheme.png r1 manage 71.9 K 24 May 2017 - 14:42 KonstantinLekomtsev  
PNGpng LUCX_scheme_drive-witness.png r1 manage 89.1 K 25 May 2017 - 12:02 KonstantinLekomtsev  
PNGpng M1_scan.png r2 r1 manage 55.3 K 25 May 2017 - 13:50 KonstantinLekomtsev  
PNGpng PIC_experiment_crosscheck.png r1 manage 68.6 K 24 May 2017 - 15:10 KonstantinLekomtsev  
PNGpng TR_crosscheck.png r1 manage 76.4 K 24 May 2017 - 15:10 KonstantinLekomtsev  
PNGpng capillary_design.png r1 manage 139.1 K 25 May 2017 - 12:02 KonstantinLekomtsev  
JPEGjpg drive_witness_targets.jpg r1 manage 1301.3 K 25 May 2017 - 12:17 KonstantinLekomtsev  
PNGpng experimental_scheme_part1.png r1 manage 170.4 K 24 May 2017 - 13:54 KonstantinLekomtsev  
PNGpng experimental_scheme_part2.png r1 manage 219.0 K 24 May 2017 - 14:00 KonstantinLekomtsev  
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Topic revision: r5 - 25 May 2017 - KonstantinLekomtsev

 
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