Direct high power laser diagnostic technique based on focused electron bunch

R. Sato, Y. Yoshida, K. Nonomura, Kazuyuki Sakaue, A. Endo, Masakazu Washio

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In laser produced plasma EUV source, high intensity pulse CO<inf>2</inf> laser is essential for plasma generation. To achieve high conversion efficiency and stable EUV power, we desire to measure laser profile at the collision point. However, focused laser profile has not been observed directory by existing techniques. We have been developing laser profiler based on laser Compton scattering. Laser profile can be measured by scanning focused electron beam while measuring Compton scattering signal. This method is suitable for a high intensity laser, but very small spot size of electron beam is required. To achieve small spot size, we use S-band photocathode rf gun and specially designed solenoid lens. The beam size was simulated by General particle tracer (GPT) and directory measured by Gafchromic film HD-810. We have succeeded in observing minimum beam size of about 20μm rms. We are preparing beam scanning system, pulse CO<inf>2</inf> laser and a detector for Compton signal. In this conference, we will report the results of focused electron beam measurement and future prospect.

Original languageEnglish
Title of host publicationIPAC 2014: Proceedings of the 5th International Particle Accelerator Conference
PublisherJoint Accelerator Conferences Website (JACoW)
Number of pages3
ISBN (Print)9783954501328
Publication statusPublished - 2014 Jul 1
Event5th International Particle Accelerator Conference, IPAC 2014 - Dresden, Germany
Duration: 2014 Jun 152014 Jun 20


Other5th International Particle Accelerator Conference, IPAC 2014

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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