WEDLA —  Contributed Orals   (16-Sep-15   16:00—17:00)
Chair: F. Perez, ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
Paper Title Page
WEDLA01 First Results of Solaris Synchrotron Commissioning 1
  • A.I. Wawrzyniak, C.J. Bocchetta, P.B. Borowiec, P. Bulira, P.P. Goryl, A. Kisiel, M.P. Kopec, R. Nietubyć, Ł. Żytniak
    Solaris, Kraków, Poland
  • A. Marendziak, M.J. Stankiewicz, M. Zając
    Solaris National Synchrotron Radiation Centre, Jagiellonian University, Kraków, Poland
  Funding: Work supported by the European Regional Development Fund within the frame of the Innovative Economy Operational Program: POIG.02.01.00-12-213/09
Solaris is a third generation light source recently constructed at the Jagiellonian University in Kraków. The installation of the 600 MeV S-band linear accelerator with thermionic RF gun and transfer line as well as the 1.5 GeV storage ring is now complete. In November 2014 subsystem tests and conditioning of the Solaris linac were started. A 300 MeV electron beam at the end of the linac was observed for the first time in February 2015 after which the machine was shut down for 2.5 months to complete transfer line and storage ring installation. In May the commissioning of the linac together with the transfer line and storage ring began. The beam was soon observed on the YAG screen monitor, installed at the injection straight in the storage ring. The beam current measured with the fast current transformer in the transfer line was 8 mA over 180 ns, at 360 MeV. The commissioning of the machine is still in progress and preliminary results of Solaris are presented.
WEDLA02 High Frequency Electro-Optic Beam Position Monitors for Intra-Bunch Diagnostics at the LHC 1
TUPB072   use link to see paper's listing under its alternate paper code  
  • S.M. Gibson, A. Arteche, G.E. Boorman, A. Bosco
    Royal Holloway, University of London, Surrey, United Kingdom
  • P.Y. Darmedru, T. Lefèvre, T.E. Levens
    CERN, Geneva, Switzerland
  At the HL-LHC, proton bunches will be rotated by crab-cavities close to the interaction regions to maximize the luminosity. A method to rapidly monitor the transverse position of particles within each 1ns bunch is required. A novel, compact beam diagnostic to measure the bunch rotation is under development, based on electro-optic crystals, which have sufficient time resolution (<50ps) to monitor intra-bunch perturbations. The electro-optic beam position monitor uses two pairs of crystals, mounted on opposite sides of the beam pipe, whose birefringence is modified by the electric field of passing charged particle beam. The change of birefringence depends on the electric field which itself depends on the beam position, and is measured using polarized laser beams. The electro-optic response of the crystal to the passing bunch has been simulated for HL-LHC bunch scenarios. An electro-optical test stand including a high voltage modulator has been developed to characterize LiTaO3 and LiNiO3 crystals. Tests to validate the different optical configurations will be reviewed. The opto-mechanical design of an electro-optic prototype that will be installed in the CERN SPS will be presented.  
slides icon Slides WEDLA02 [46.471 MB]  
poster icon Poster WEDLA02 [12.193 MB]  
WEDLA03 Beam Profile Monitor at the 1 MW Spallation Neutron Source 1
  • S.I. Meigo, A. Akutsu, K. Ikezaki, M. Nishikawa, M. Ooi
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • S.F. Fukuta
    KEK/JAEA, Ibaraki-Ken, Japan
  At the Japanese Spallation Neutron Source (JSNS) using a mercury target, the transverse beam profile of 3 GeV beam having the power of 1 MW is measured by a multi-wire profile monitor (MWPM) placed at the proton beam window (PBW) being the separator between vacuum and helium area at the target station. The profile monitor is crucial because the beam peak current density should be kept as low as possible to mitigate the damage at the mercury target vessel due to the pitting erosion caused by the high power proton beam. Simple beam expantion at the target is useless because it simply increases the heat load and the radiation dose at the entrance of the target. To mitigate damage, a beam flattening system using non-linear optics with octupole magnets has been developed. It was confirmed the beam shape was controlled as designed using calculations. In order to obtain a 2D profile, we have begun using the profile monitor by observing the infrared from the target by imaging a capillary tube. At JSNS the life time of the PBW is important. To improve the lifetime of the PBW, we measure the gas production rate by using a beam dump.  
slides icon Slides WEDLA03 [9.556 MB]