Abstracts Brochure - 2nd International Particle Accelerator Conference

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Poster Panel 5 ID: 3311 - THPZ001 Spin Dynamic Tool Developments and Study Regarding the Super-B Project, Nicolas Monseu (LPSC, Grenoble Cedex), Francois Meot (BNL, Upton, Long Island, New York), Jean-Marie De Conto (LPSC, Grenoble), Ulrich Wienands (SLAC, Menlo Park, California) - The study of polarization is essential for e+/e- colliders like the SuperB machine. The ZGOUBI integrator is a good and universal tool for particle tracking as well as spin tracking, and takes into account all machine realistic aspects, like real fields, non-linearities, fringing fields or misalignments. We present ZGOUBI implementation and the methods carried out to estimate invariant spin field and beam polarization evolution on some simple models (for validation) and on SuperB, and we investigate for some specific polarization behavior. Sub Classification: A02 Lepton Colliders Poster Panel 6 ID: 3985 - THPZ009 Beam Background Simulation for SuperKEKB/Belle-II, Hiroshi Nakano (Tohoku University, Sendai), Hiroyuki Nakayama (KEK, Tsukuba) - The Belle experiment is now being upgraded to the Belle II experiment designed for a 40 times higher luminosity. Such a high luminosity is realized by the SuperKEKB collider where beaminduced background rates are expected to be much higher than those of KEKB. This poses a serious challenge for the design of the machine-detector interface. We have thus carried out a GEANT4based beam background simulation for Touschek effect and beam-gas scatterings. We describe the method of generating background particles and present the result of simulation. Sub Classification: A02 Lepton Colliders Poster Panel 7 ID: 3154 - THPZ015 LHeC Lattice Design, Miriam Fitterer, Oliver Sim Brüning, Helmut Burkhardt, Bernhard Johannes Holzer, John M. Jowett, Karl Hubert Mess, Thys Risselada (CERN, Geneva), Anke-Susanne Mueller (KIT, Karlsruhe), Max Klein (The University of Liverpool, Liverpool) - The Large Hadron Electron Collider (LHeC) aims at lepton-proton and lepton-nucleus collisions with � 3 centre of mass energies of 1-2 TeV at ep luminosities in excess of 10^33 cm^-2 s^-1. We present here a lattice design for the electron ring option, which meets the design parameters and also the constraints imposed by the integration of the new electron ring in the LHC tunnel. Sub Classification: A17 Electron-Hadron Colliders Poster Panel 8 ID: 3801 - THPZ031 Halo Scraping with Collimators in the LHC, Florian Burkart, Ralph Assmann, Roderik Bruce, Marija Cauchi, Daniel Deboy, Stefano Redaelli, Daniel Wollmann (CERN, Geneva) - The population of the beam halo has been measured in the LHC with beam scraping experiments. Primary collimators of the LHC collimation system were used to scrape the beam halo at different statuses of the machine (injection, top energy, separated and colliding beams). In addition these measurements were used to calibrate the beam loss monitor signals to loss rates at the primary collimators. Within this paper the halo scraping method, the measured halo distribution and the calibration factors are presented and compared to theoretical predictions. Sub Classification: T19 Collimation Poster Panel 9 ID: 3800 - THPZ035 Semi-automatic Beam-based Alignment Algorithm for the LHC Collimation System, Gianluca Valentino, Nicholas Sammut (CERN, Geneva; University of Malta, Msida), Ralph Assmann, Stefano Redaelli, Daniel Wollmann (CERN, Geneva) - Full beam-based alignment of the LHC collimation system was a lengthy procedure as the collimators were set up manually. A yearly alignment campaign has been sufficient for now, although in future this may lead to a decrease in the cleaning efficiency if machine parameters such as the beam orbit drift over time. Automating the collimator setup procedure can allow for more frequent alignments, therefore reducing this risk. This paper describes the design and testing of a semi-automatic algorithm as a first step towards a fully automatic setup. Its implementation in the collimator control software and future plans are described. Sub Classification: T19 Collimation
� Classification 2: Synchrotron Light Sources and FELs Poster Panel 10 ID: 3482 - THPC045 Design of a Compact Storage Ring for the TTX, Haisheng Xu, Wenhui Huang, Chuanxiang Tang (TUB, Beijing), Shyh-Yuan Lee (IUCEEM, Bloomington, Indiana) - We study a compact storage ring with circumference 3-m, 4 dipoles, and two quadrupoles for the Tsinghua Thomson scattering Xray (TTX) source. The effects of Touschek lifetime, rf system requirement, the Intra-beam scattering (IBS) and coherent synchrotron radiation (CSR) will be addressed. A top-up injection system will be designed to maximize the Photon flux. Conceptual laser cavity to enhance photon flux will be discussed. Expected performance of the compact Xray source will be presented. Sub Classification: A05 Synchrotron Radiation Facilities Poster Panel 11 ID: 2936 - THPC006 Experiments to Measure Electron Beam Energy using Spin Depolarization Method on SOLEIL Storage Ring, Jianfeng Zhang, Lodovico Cassinari, Marie Labat, Amor Nadji, Laurent Stanislas Nadolski, Dominique Pedeau (SOLEIL, Gif-sur-Yvette) - The SOLEIL storage ring electron beam energy was measured using spin depolarization method. The electron polarization was simulated using the SLIM code. The experimental results demonstrate that polarization build up time is 17 minutes as expected by the simulation and the depolarization process was also observed. The beam was depolarized using an AC shaker and the depolarization was monitored using DCCT and beam loss monitors. The problems to precisely determine the beam energy due to the wide resonance widths are discussed. Sub Classification: A05 Synchrotron Radiation Facilities Poster Panel 12 ID: 4494 - THPC100 Full Temporal Reconstruction using an Advanced Longitudinal Diagnostic at the SPARC FEL, Gabriel Marcus, James Rosenzweig (UCLA, Los Angeles, California), Luca Giannessi (ENEA C.R. Frascati, Frascati (Roma)), Massimo Ferrario (INFN/LNF, Frascati (Roma)) - The Production of ultra-short (sub 100 fs) single-spike radiation 4 possessing full longitudinal coherence from a freeelectron laser (FEL) has been the subject of intense study. The diagnosis of said pulses has proven to be challenging. A Frequency-Resolved Optical Gating (FROG) diagnostic has been developed and tested at UCLA, which has the capability of providing a longitudinal reconstruction of these ultra-fast pulses. This paper reports the results of the application of the diagnostic at the SPARC FEL facility for initial seeding experiments. Sub Classification: A06 Free Electron Lasers Poster Panel 13 ID: 4368 - THPC102 Two-color IFEL Microbunching at Neptune Laboratory, Finn O'Shea, Pietro Musumeci, James Rosenzweig (UCLA, Los Angeles, California) - We introduce the 2-color microbunching experiment to be performed at the UCLA Neptune Laboratory. We will use a new cryogenic undulator and seed the inverse free electron laser with two closely spaced CO2 laser frequencies. The result is significant bunching at THz frequencies. The technique is potentially useful for prebunching electron beams at frequencies that have no available solid state or gas lasers. Sub Classification: A06 Free Electron Lasers Poster Panel 14 ID: 4082 - THPC087 Saturation Effect on VUV Coherent Harmonic Generation at UVSOR-II, Takanori Tanikawa, Masahiro Adachi, Masahiro Katoh, Jun-ichiro Yamazaki, Heishun Zen (UVSOR, Okazaki), Masahito Hosaka, Yoshitaka Taira, Naoto Yamamoto (Nagoya University, Nagoya) - Light source technologies based on laser seeding are under development at the UVSOR-II electron storage ring. In the past experiments, we have succeeded in generating coherent harmonics (CHs) in deep ultraviolet (UV) and vacuum UV (VUV) region and also in generating CH with variable polarizations in deep UV*. In previous conference, we reported an introduction of new-constructed spectrometer for VUV and results of spectra measurement, undulator gap dependence, and injection laser power dependence on VUV CHs**. This time we have successfully observed saturation on CHs intensities and have found some interesting phenomena in different harmonic orders. In this conference, we
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Abstracts Brochure - 2nd International Particle Accelerator Conference

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