Ceremony and lecture – Gothenburg Lise Meitner Award 2018
Professor Chandrashekhar Joshi, University of California, Los Angeles, USA, is the winner of the Gothenburg Lise Meitner Award 2018. He will visit the Gothenburg Physics Centre to receive the award and give the traditional award lecture in honour of the Austrian-Swedish physicist Lise Meitner. Professor Chandrashekhar Joshi receives the award "for conclusively demonstrating the advantages of using relativistically propagating plasma waves for electron acceleration." Refreshments will be served after the lecture.
The Development of Plasma Accelerators as an Experimental Field
In this talk I will review how the concept of using collective electric fields in a plasma has developed into an experimental field over the past four decades. Such fields can be excited by separating plasma electrons from the ions to generate a relativistic space charge wave using a short laser pulse or a relativistic charged particle bunch. During the first decade such short drive pulses were not invented so the researchers had to use two longer laser pulses having different frequencies so that their frequency difference was equal to the plasma frequency to resonantly excite the relativistic plasma wave. A pre-accelerated bunch of electrons was further accelerated by this wave. This experiment heralded the dawn of plasma accelerators. The second decade was marked by the arrival of the chirped pulse amplification based lasers that could give picosecond duration terawatt class laser pulses. When sent through plasmas, such ultra-intense laser pulses self-modulated into a beat wave and excited a plasma wave. Plasma electrons could be self-injected and accelerated by this wave up to 100 million volts in just a millimeter setting terrestrial records for the rate charged particle acceleration. During the third and the forth decade, femtosecond class petawatt lasers generated multi- GeV, narrow energy spread electron beams while relativistic electron and positron beam drivers showed high efficiency and high quality multi GeV acceleration. I will give a historical overview and describe the current status of this exciting field that has blossomed from a laboratory scale experiment into a worldwide effort.
About Chandrashekhar Joshi
Professor Chandrashekhar Joshi is considered the Father of the experimental field of High-Gradient Plasmabased Charged Particle Acceleration – a paradigm shift for building accelerators of tomorrow.
In a career spanning four decades, Joshi and his colleagues have carried out pioneering experiments -using laser and ultra-relativistic electron pulses as drivers- on electron and positron acceleration using plasma waves thousands of times more rapidly than in a conventional accelerator.
Event; Lecture; Public lecture
FB, lecture hall,
20 September, 2018, 15:15
20 September, 2018, 17:00