Results from the laser-wire at ATF2 and development of a fibre laser for its upgrade

Thesis

The commissioning and development of a laser-wire transverse electron beam profile monitor at the Accelerator Test Facility 2 in Japan is presented. The experimental setup used including a gigawatt laser system is detailed and characterised. Results from data taking in December 2010 are presented detailing the use of the laser-wire to tune the electron beam.

In conjunction with this, the use of a fibre-based laser system as a suitable laser source for a laser-wire is discussed. A test bed fibre laser system was constructed to investigate the suitability of fibre lasers and the results are presented demonstrating high efficiency and excellent spatial quality. From this, a laser system capable of high resolution and high repetition intra-train scanning for demonstration at the Accelerator Test Facility 2 was designed, constructed and characterised. A commercial fibre laser system was extended using a photonic crystal fibre where periodic amplification designed to match the duty cycle of an accelerator was used advantageously to achieve higher than normal pulse energies. The results and techniques developed to measure them are presented.

Authors: Nevay, L

• Publication date: 2011
• DOI: 10.5287/ora-obv6vo0kr
• Type of award: DPhil
• Level of award: Doctoral
• Awarding institution: Oxford University, UK
• Language: English
• Keywords: photonic; laserwire; fibre; accelerator; laser; ATF2; diagnostic; fibre laser
• Subjects: Particle physics; Atomic and laser physics