ICFA Future Light Sources Sub-panel Mini-Workshop on XFEL Short Bunch Measurement and Timing Stanford Linear Accelerator Center, July , 2004 Executive Committee John Galayda, LCLS-SLAC; Joerg Rossbach, DESY-Uni. Hamburg; Kwang-Je Kim, APS-ANL

Organizers: Jerry Hastings SSRL Patrick Krejcik SLAC Juhao Wu SLAC Holger Schlarb DESY 1.Measurement techniques for electron bunch length and arrival time 2.Diagnostics for spontaneous undulator and XFEL radiation for the determination of the temporal profiles. 3.Timing and synchronization of the electron beam, acceleration RF and ultra-fast lasers

Workshop focuses on technical aspects of monitor systems to characterize the longitudinal electron and photon pulse profiles especially after final compression:  typical time scales of operation is ~ fs  good control of the accelerator requires resolutions of ~ fs - and taking into account potential micro-bunch instabilities < 10 fs  beside the high precision the monitor has - a large dynamic range - is fully parasitical and non-destructive - allows a detailed recording of bunch to bunch parameters - ultra-fast processing time for feedback loops (<10ms LCLS, <1us XFEL) - suited for non-standard operation (rep. rate, charge, orbit, etc.) - insensitive to accelerator jitter - operation with high reliability, availability and a high degree of automation  Very likely that different system with complementary abilities are required Question: which monitor can be used and what is the best suited combination

Workshop structure Limited number of talks: Overview on the different techniques Recent experimental result using the new techniques Background information on the theory  Common understanding on the various subjects for all participants  Update on the state-of-art systems  Current limitations of a system and potential upgrades Sufficient time for discussion: on the potentials of the different methods to identify open items and question to be addressed  Exchange of technologies and successful developments  Distribute homework on required theoretical or exp. investigations  Search on new techniques or for combinations of known methods  Make use of potentials given by SPPS, TTF2 or other facilities

Workshop structure Timing and synchronization (Mo/Tu):  Beam stabilization, increase performance of monitors system conventional RF systems LLRF regulation applicability of new synchronization methods Photon diagnostics (Tu/We): simulations spont. + FEL techniques on spectrum, pulse power and pulse length and coherence Electron diagnostics (Th): electro-optical techniques Coherent radiation diagnostics and T-cavity  Not obvious if photon or electron techniques have higher potentials  To certain extend both are required for cross-checks or to accomplish the experimental results

Oak grove Picnic area XFEL Workshop Barbecue A sunset picnic has been planned in a sylvan setting just a short drive from SLAC in the Santa Cruz Mountain Foothills. A full BBQ dinner with refreshments will be provided at no cost to workshop participants and their companions through the generous support of Varian Corporation. Jeff Morgan, local engineer from Varian will be on hand if you’d like to thank him. WHEN: Monday 6 p.m. until 9 p.m., start at guesthouse WHERE: Foothill Park, Palo Alto, in the Oak Grove group picnic area

Tuesday evening Depart SLAC 5.30 p.m. from Guesthouse! Tickets to be picked up from Helen O’Donnell Starting from: 2475 Sand Hill Rd, Menlo Park, CA Arriving at: NETWORK ASSOCIATES COLISEUM 7000 Coliseum Way, Oakland, CA Distance: 38.0 miles Approximate Travel Time: 49 min Your Directions Baseball Game

Insalate Caesar Salad Hearts of Romaine and Grana Padano with our famous Caesar dressing Insalata Mista Baby field greens with sliced Fuji apples and candied walnuts, tossed in balsamic vinaigrette ________ Piatti di Mezzo (Your choice of one of the following) Gemelli agli Asparagi Gemelli pasta with spring asparagus and herb sauce, with a pesto of basil and roasted asparagus Orecchiette alla Sarda Slow simmered sauce of house made Sardinian sausage,tomato sauce, with white wine and a touch of saffron and herbs Salmone Arrostita Pan roasted Salmon with citrus jus, served with potato purèe and market vegetables Griglia Mista Mediterranean style herb marinated Sirloin and house made Italian sausage with roasted Yukon Gold potatoes and balsamic garlic Blue Lake green beans ________ Dessert Panna Cotta Traditional Italian cooked cream with strawberry sauce Torta di Cioccolato House made Chocolate torte with raspberry sauce Banquet Dinner Wednesday 7 pm Café Niebaum-Coppola 473 University Ave Palo Alto $50 per person Includes Wine Tasting Of Fine Napa Valley Niebaum-Coppola Wines