MAKING WAY FOR LCLS II HERRIOTT CELL IGNIS THE NEED FOR LCLS-II

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Presentation transcript:

MAKING WAY FOR LCLS II HERRIOTT CELL IGNIS THE NEED FOR LCLS-II Meriame Berboucha1, Matthew Windeler2, Katalin Mecseki2, Franz Tavella2, Joe Robinson2, Alan Fry2 1Physics Department, Imperial College London, South Kensington Campus, London, United Kingdom. 2Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA. +Contact: kmecseki@slac.stanford.edu HERRIOTT CELL IGNIS THE NEED FOR LCLS-II THE FUTURE High power laser system for the development of LCLS-II shall be built by late 2017. This shall be used for research and development in preparation for LCLS-II construction. WHY IS IGNIS SPECIAL? Not many of these systems exist. The Linac Coherent Light Source (LCLS) at SLAC is the world’s first hard x-ray free electron laser. LCLS would like to take a leap forward in capability and increase the current 120 pulses a second system to 1 million pulses a second for even more exciting scientific experiments. Here, the high power laser system for the development of LCLS-II, known as IGNIS, will be discussed with focus on the Herriott cell system which will be used to create an optical time delay in one of the laser beam arms. Keywords: OPCPA laser system, multi-pass cell, interns, Herriott cell   800nm (and 1500nm) Pulse duration: 15 fs Pulse energy ~ 1 mJ 100 kHz Average power: 100W OPCPA laser system WHAT I’VE BEEN UP TO Distance between mirrors Input beam angle Diameter of mirror MOVING FROM OLD LASER LAB TO NEW SHINY LASER LAB BUILDING LASER ENCLOSURE TO MEET SAFETY REGULATIONS VISITING THE HUTCHES, SSRL, SLAC LINAC AND SEEING SOME SCIENCE IN ACTION WORKING WITH THE COMMUNICATIONS GROUP AND PROMOTING SLAC INTERN LIFE High repetition rate High pulse energy High average power Herriott cell used to produce optical time-delay so that pulses reach each other at the same time. Figure 5: Schematic of IGNIS, the OPCPA laser system that shall be used for the research and development phase before the construction of LCLS-II. Figure 3: Experimental setup for testing the Herriott cell. Figure 1: Top left and right: laser enclosure for IGNIS. Bottom left: cleaning the inside of the laser enclosure so that optics are not damaged when the laser is on. Bottom right: inside of laser enclosure. FINAL WORDS 2’’ off-axis hole Herriot cell can provide up to 35.9m of optical time delay IGNIS shall be a high power, high repetition OPCPA laser system that shall provide important insight for the construction of LCLS-II Figure 4: Pattern of reflection points shown on Herriott cell mirror where a circle and ellipse patterns are shown for various input angles and distances between the mirrors, where distances were kept to <4f (focal length). ACKNOWLEDGEMENTS I wish to thank Alan Fry and Mike Dunne for providing me with the unique opportunity of being the first international intern at SLAC, to Katalin Mecseki and Franz Tavella for being outstanding mentors, to Matthew Windeler for being a great a lab buddy and to Maegan Gonzales, Omar Quijano, Riccardo Veraldi and Ernesto Paiser for making my stay at SLAC memorable. Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Figure 2: Picture of LINAC. Date: 08/09/2016