Basic Energy Science Workshop on Future Electron Sources

Transcription

1 Basic Energy Science Workshop on Future Electron Sources Workshop Co-Organizers Pietro Musumeci (UCLA) & Xijie Wang (SLAC) DOE BES contact: Eliane Lessner Workshop charge Electron sources represent a critical enabling technology for cuttingedge applications of electron accelerators. The development of highbrightness electron sources led to the success of X-ray free electron laser (FEL), which has changed the paradigm for many areas of science, such as imaging single nano-scale particles and understanding chemistry on the natural timescales of reactions. The introduction of cold field emitter electron sources and aberration correction optics made it possible for electron microscope to achieve sub-å spatial resolution. Breakthrough advances in electron sources are required for future X-ray and electron instruments. DOE BES will sponsor a Workshop on Future of Electron Sources September 8th and 9th 2016 to be held at SLAC National Accelerator Laboratory. The Workshop will explore the frontier of electron source R&D with the following goals: Identify needs and opportunities for research in novel electron sources Seek for transformational advances in peak and average electron beam brightness to enable and expand scientific capabilities of X- ray and electron scattering instruments. Explore enabling novel applications such as shorter wavelength FELs, single shot UEM, fs-nanodiffraction, high average flux Compton, compact light sources, etc.

2 Workshop Format 0.5 plenary talks 1.5 days working groups + report writing 65 people attendance, participants from the following: 15 people representing US Universities: ASU, Cornell, Michigan State, MIT, Stanford University, NIU, UCLA, National Laboratory: ANL, BNL, LBNL, LANL, LLNL, SLAC, JLAB International: China (1), Japan (2), Europe (4) DOE: BES (2), HEP (1), NP(1)

3 Plenary Talks Workshop charge and electron source research overview at DOE (E. Lessner/J. Murphy) General idea behind workshop. Motivation. DOE BES interest High brightness electron sources (I. Bazarov) Status of electron source research. Quantum limit of beam brightness. Regimes of operation of photoinjectors. Future Needs of Electron Source for X-ray FEL (P. Emma) Electron source needs; X-ray FEL oscillator and amplifiers (LCLS2 and Marie). Performance tradeoffs Future Need of Electron Source for Electron Scattering Instrumentation (D. Muller) Opportunities in ultrafast electron diffraction and ultrafast electron microscopy. Parameter list for ideal source for electron scattering instrumentation. Novel electron sources (S. Chattopadhyay) Advanced concepts. Source needs for Compton applications /Plasmas source

4 PANELS Panel # 1: Science and technology of electron generation Panel Leaders: K. Harkay and A. Fry Can the thermal emittance be reduced by orders of magnitude? Where can we expect significant improvements in QE + thermal emittance + lifetime performances? Laser and optics shaping for future electron sources. Characterization and off-line diagnostics of photocathode properties Panel #2: CW electron source Panel Leaders: B. Dunham and J. Sekutowicz What is mainly limiting the brightness of CW injectors? How do SRF, DC and VHF gun compare? What is the ideal application for each? Can we satisfy the stability, timing and synchronization demands? Panel # 3: Pulsed injectors Panel Leaders: B. Carlsten and J. Power What is the effect of higher extraction field on the beam brightness? What are the novel ideas to push the performances of these devices? Simulations and modeling (space charge, disorder induced heating) Can we satisfy the stability, timing and synchronization demands? Panel # 4: Exotic sources: Cold atoms, plasma-based, tips, THz guns Panel Leaders: P. Piot and C. Schroeder How far from prime-time are exotic sources? Field emission sources Which one is most promising given the range of applications for BES Identify the first applications where some of these sources will make an impact. Are simulations and modeling tool adequate?

5 Panelists Preliminary list WG1 Physics of photoemission K. Harkay, A. Fry, H. Padmore, L. Cultrera, N. Moody, J. Smedley, A. Schroeder, K. Jensen, M. Babzien, F. Hannon, S. Karkhare, T. Vecchione, F. Sannibale WG2 CW electron sources B. Dunham, J. Sekutowicz, D. Filippetto, I. Bazarov, C. Hernandez Garcia, M. Yamamoto, W. Wan, A. Minor, R. K. Li, J. Frisch, J. Lewellen, D. Flannigan, J. Qiang, D. Muller WG3 Pulsed electron guns B. Carlsten, J. Power, M. Berz, J. B. Rosenzweig, K. J. Kim, Y. Zhu, J. Maxson, C. Limborg, S. J. Russell, T. Shintake, F. Zhou, M. Ferrario, P. Emma WG4 Novel sources P. Piot, C. Schroeder, M. Chen, W. Graves, B. Barwick, E. Nanni, M. Fuchs, W. Gai, J. Van Tilborg, J. Wu, F. Albert, H. Andrews, M. B. Raschke, P. Baum, K. More, S. Chattopadhyay Note: Bold working group lead Green from US University Red oversea participants Italic Plenary speaker