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TY - CONF AU - Li, S. AU - Coffee, R.N. AU - Cryan, J. AU - Guo, G. AU - Hegazy, K.H. AU - Huang, Z. AU - Marinelli, A. AU - Natan, A. AU - Osipov, T. AU - Ray, D. ED - Bishofberger, Kip:Carlsten, Bruce (LANL, Los Alamos, NM, USA)[ORCID:0000-0001-5619-907X] ED - Schaa, Volker RW TI - Characterizing Sub-Femtosecond X-ray Pulses from the Linac Coherent Light Source J2 - Proc. of FEL2017, Santa Fe, NM, USA, August 20-25, 2017 C1 - Santa Fe, NM, USA T2 - International Free Electron Laser Conference T3 - 38 LA - english AB - The development of sub-femtosecond x-ray capabilities at the Linac Coherent Light Source requires the implementation of time-domain diagnostics with attosecond (as) time resolution. Photoelectrons created by attosecond duration x-ray pulses in the presence of a strong-laser field are known to suffer an energy spread which depends on the relative phase of the strong-laser field at the time of ionization. This phenomenon can be exploited to measure the duration of these ultrashort x-ray pulses. We present an implementation which employs a circularly polarized infrared laser pulse and novel velocity map imaging design which maps the phase dependent momentum of the photoelectron onto a 2-D detector. In this paper, we present the novel co-linear VMI design, simulation of the photoelectron momentum distribution, and the reconstruction algorithm. PB - JACoW CP - Geneva, Switzerland SP - 535 EP - 538 KW - ion KW - electron KW - laser KW - simulation KW - detector DA - 2018/02 PY - 2018 SN - 978-3-95450-179-3 DO - 10.18429/JACoW-FEL2017-WEP060 UR - http://jacow.org/fel2017/papers/wep060.pdf ER -