Highlights and discussion at LAL FKPPL & FJPPL “Toshiko Yuasa” workshop Philip Bambade Laboratoire de l’Accélérateur Linéaire Université Paris 11, Orsay,

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Highlights and discussion at LAL FKPPL & FJPPL “Toshiko Yuasa” workshop Philip Bambade Laboratoire de l’Accélérateur Linéaire Université Paris 11, Orsay, France KILC12, Daegu, South Korea 24 April 2012

Sessions 1.“Goal 1” R&D : RD and EXT emittance, recent running, BSM status and discussion of systematics, beam halo, Geant4 simulation of bremstrahlung bkgd, discussion of new strategy, issues and priorities 2.“Goal 2” R&D : low-Q IPBPM status, mechanics, plan for IP feedback, usage with IPBSM, thoughts on calibration, staging of objectives and scheduling 3.New projects (planned CERN hardware contributions) : Kicker, FD upgrade, GM sensors 4.Progress reports : Beam trajectory and Twiss reconstruction, neutron modeling, post-IP halo and Compton recoil spectrum measurements, FONT analysis 5.Scheduled discussions of engineering issues : IPBPM mechanics, FD hybrid magnet, GM sensor testing and usage, IPBSM systematics P. Bambade, S. Wallon (LAL), K. Kubo, T. Tauchi, T. Terunuma (KEK), J. Yan (Tokyo), S. Bai (IHEP), H. Guler (LLR), S. Jang (KNU), P. Burrows, G. Christian (JAI), D. Schulte, A Vorozhtshov, Y. Renier, H. Garcia Morales (CERN), H. Hyun (KNU&LAL), A. Jérémie (LAPP)

Jacqueline Yan (Tokyo)

ATF2: background dependence on  * GEANT4 (idealized conditions) from Hayg Guler (LLR) February – March 2012 from Toshiyuki Okugi (KEK)  post-IP bend magnet vertical gap

ATF2: physical apertures in FFS Sha Bai (IHEP)

ATF2: intercepted halo in FFS ? QD10 QF9 Sha Bai (IHEP)

S. Wallon & F. Bogard (LAL)

Required precision on relative IP-BPM scale factors depends on beam parameters  ~ 1 m (e.g. diagnostic section)  123IP d  IP = (y 2 – y 1 ) / d y IP = 2 y 2 – y 1  = calibration error of 1 relative to 2  2 y 2 – y 1 ~ y IP + 2   d  jitter ~ (  /  ) 0.5 d (  jitter /  ) ~ rad   ~ for 1 nm error d ~ 0.1 m  y ~ 12 pm  jitter /  ~10%  ~ m (interaction point : nominal 10 x optics)  jitter ~ (  /  ) 0.5 d (  jitter /  ) ~ rad   ~ for 1 nm error  ~ for 10 nm error  ~ for 1 nm error  “nanometer resolution demonstration” and to “IP extrapolation for feedback purpose”

Some comments on new “goal 1” strategy 1.Prepare 12 “students” for ATF2 operation (coordinated by S. Kuroda)  S. Kuroda and J. Yan in next talk 2.Eight weeks dedicated “goal 1” operation in October-December - daily & weekly meetings  review progress, modify the planning,… - commissioning and operation plan jointly defined and supported: - overall coordinator in addition to weekly / daily shift management: several paths can appear and may be valid, but single decision essential to avoid confusing the “students” in the control room ! based on-site, experienced in machine physics and management for efficient communication flow between all contributors