Author: Kubytskyi, V.
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MOPMB006 First Tests of SuperKEKB Luminosity Monitors during 2016 Single Beam Commissioning 81
SUPSS067   use link to see paper's listing under its alternate paper code  
  • D. El Khechen, P. Bambade, A. Blin, P. Cornebise, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault
    LAL, Orsay, France
  • Y. Funakoshi, Y. Ohnishi, S. Uehara
    KEK, Ibaraki, Japan
  The SuperKEKB e+e collider aims to reach a very high luminosity of 8 1035 cm-2s−1, using highly focused ultra-low emittance bunches colliding every 4ns. Fast luminosity monitoring is required for luminosity feedback and optimisation in presence of dynamic imperfections. The aimed relative precision is about 10-3 in 1ms, which can be in principle achieved thanks to the very large cross-section of the radiative Bhabha process at zero degree scattering angle. Diamond, Cherenkov and scintillator sensors are to be placed just outside the beam pipe, downstream of the interaction point in both rings, at locations with event rates consistent with the aimed precision and small enough backgrounds from single-beam particle losses. The initial configuration installed for the 2016 "phase 1" single beam commissioning will be described, including the sensors, mechanical setup, readout electronics and first stage DAQ. Preliminary measurements and analysis of beam gas Bremsstrahlung loss data collected with the luminosity monitors will be reported and compared with a detailed simulation, for several experimental conditions during the SuperKEKB commissioning.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB006  
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MOPMB007 Diamond Sensor Resolution in Simultaneous Detection of 1,2,3 Electrons at the PHIL Photoinjector Facility at LAL 84
  • V. Kubytskyi, P. Bambade, S. Barsuk
    LAL, Orsay, France
  • O.A. Bezshyyko, V. Krylov, V. Rodin
    National Taras Shevchenko University of Kyiv, The Faculty of Physics, Kyiv, Ukraine
  In this paper, we present experimental and numerical studies of the signals from the Poisson-like distributions resulting from electrons incident on a diamond sensor placed near the exit of the PHIL photoinjector facility at LAL. The experiments were performed at the newly commissioned Low Energy Electron TECHnology (LEETECH) platform at PHIL. Bunches of 10x9 electrons are first generated and accelerated to 3.5 MeV by PHIL. The electrons are then filtered in LEETECH by a system of collimators, using a dipole magnet for momentum selection. The diamond sensor is located immediately after the output collimator to collect electrons in the range 2.5-3 MeV. We show that with standard scCVD diamonds of 500 micrometers thickness, the energy losses from the first three MIP (minimum ionizing particle) electrons are clearly resolved. We did not observe distinguishable peaks in cases when a significant fraction of the incident electrons had energies below a MIP. The described technique can be used as complementary approach for calibration of diamond detectors as well as to diagnose and help control accelerated beams in a regime down to a few particles.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB007  
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MOPMB008 Modeling and Experimental Studies of Beam Halo at ATF2 88
SUPSS074   use link to see paper's listing under its alternate paper code  
  • R.J. Yang, P. Bambade, V. Kubytskyi
    LAL, Orsay, France
  • A. Faus-Golfe, N. Fuster-Martínez
    IFIC, Valencia, Spain
  • T. Naito
    KEK, Ibaraki, Japan
  The Accelerator Test Facility 2 (ATF2) at KEK is a prototype of the final focus system for the next generation of Future Linear Colliders(FCL). It aims to focus the beams to tens of nanometer transverse sizes and to provide stability at the few nm level. Achieving these goals requires modelling, measuring and suppressing of the transverse beam halo before the interaction point (IP). This paper presents a beam tail/halo generator based on realistic model and the investigation of vertical and horizontal beam tail/halo distribution at ATF2.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB008  
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WEPOR019 Development of CVD Diamond Detector for Beam Conditioning Monitor at the SuperKEKB Linac 2707
  • S. Kazama, T. Kamitani
    KEK, Ibaraki, Japan
  • P. Bambade, V. Kubytskyi
    LAL, Orsay, France
  Positron beams in SuperKEKB will be produced from electromagnetic showers originating from the interaction between primary electron beams and a tungsten target. Since the emittance of primary beams is very small, the target is easy to be destroyed if focused beams are irradiated. In the SuperKEKB LINAC, a plate called spoiler is placed in the upstream of the target to enlarge the beam spot size. If the beam control is in a correct way, radioactive rays will be observed near both the spoiler and the target. However, if the beam control is not successful and primary beams are irradiated directly on the target, significant radiations are observed only near the target. If such a behavior is observed, primary beams must be stopped to protect the target. Since the number of electrons in a bunch is quite large(~10nC), the radiation dose is expected to be very high. Therefore, the radiation detector is required to have a high radiation-tolerance over a long period of time. Diamond has a high radiation tolerance due to its strong covalent bond, and we are now developing radiation detectors using diamond crystals. In this talk, current status including beam test measurements will be shown.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR019  
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