31 July 2016 to 5 August 2016
Gaylord Hotel and Conference Center
US/Eastern timezone

Gas density structure of supersonic flows impinged on by thin blades for laser-plasma accelerators

4 Aug 2016, 10:30
20m
Woodrow Wilson CD (Gaylord Hotel)

Woodrow Wilson CD

Gaylord Hotel

Oral Working Group 1 WG1

Speaker

Dr. Hann-Shin Mao (LBNL)

Abstract

Shock-front injection is an effective technique for controllably triggering electrons into a trapped phase for laser plasma acceleration. One common technique to achieve this fluid phenomenon is to impinge a thin blade on the plume of a supersonic nozzle. Naively, the common thought is that the shock produced by the blade is the bow shock from the first interaction; however, the density transition that is accessible by a laser transverse to the nozzle is produced by a rapid re-expansion of the high pressure region behind the initial bow shock. This imperfect re-expansion generates compression waves that could coalesce into shock-fronts as it interacts with the surrounding ambient gas which has consequences when interpreting the injection mechanism. Here the fluid dynamics of a supersonic nozzles impinged with a thin, flat object is explored along with their implications as electron beam injectors for laser plasma accelerators.

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Primary author

Dr. Hann-Shin Mao (LBNL)

Co-authors

Dr. Alejandro Garcia (Lawrence Berkeley National Laboratory) Dr. John Bell (Lawrence Berkeley National Laboratory) Ms. Kelly Swanson (Lawrence Berkeley National Laboratory) Mr. Nicholas Dale (Lawrence Berkeley National Laboratory) Dr. Remi Lehe (Lawrence Berkeley National Laboratory) Dr. Stepan Bulanov (Lawrence Berkeley National Laboratory) Dr. Sven Steinke (LBNL) Dr. Wim Leemans (Lawrence Berkeley National Laboratory)

Presentation Materials

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