Author: Bambade, P.
Paper Title Page
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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TUPMR054 Simulation of the FCC-hh Collimation System 1381
 
  • J. Molson, P. Bambade, S. Chancé, A. Faus-Golfe
    LAL, Orsay, France
 
  Funding: Funding from the European Union's Horizon 2020 research and innovation programme under grant No 654305. Funding also from ANR-11-IDEX-0003-02.
The proposed CERN FCC-hh proton-proton collider will operate at unprecedented per-particle (50 TeV) and total stored beam energies (8.4 GJ). These high energies create the requirement for an efficient collimation system in order to protect the accelerator components and experiments. In order to verify the performance of proposed collimation system designs, loss map simulations have been performed using the code Merlin. Results for the current baseline layout are presented for both betatron and off-momentum loss maps.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR054  
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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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THOAA02 The Development of C-Band Cavity Beam Position Monitor with a Position Resolution of Nano Meter 3149
 
  • S.W. Jang, E.-S. Kim
    Korea University Sejong Campus, Sejong, Republic of Korea
  • P. Bambade, O.R. Blanco-García, S. Wallon
    LAL, Orsay, France
  • N. Blaskovic Kraljevic, T. Bromwich, P. Burrows
    JAI, Oxford, United Kingdom
  • T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
 
  We developed and tested an C-band beam position monitor with position resolution of nano meter in ATF2. The C-band BPM was developed for the fast beam feedback system at the interaction point of ATF in KEK, which C-band beam position monitor called to IPBPM (Interaction Point Beam Position Monitor). The developed IPBPM was measured 26nm with 30% of nominal beam charge of ATF. From the measured beam position resolution, we can expected to 8nm beam position resolution with nominal ATF beam charge condition. In this talk, we will described about the development of IPBPM and the beam test results of nano meter level beam position resolution.  
slides icon Slides THOAA02 [4.806 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THOAA02  
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THPMR045 CLIC Beam Delivery System Rebaselining and Long L* Lattice Optimization 3500
 
  • F. Plassard, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • P. Bambade
    LAL, Orsay, France
 
  This paper summarizes the re-optimization study made on the CLIC Beam Delivery System (BDS) in the framework of the rebaselining for beam collisions at 380 GeV for the initial energy stage. It describes the optimization process applied for the beam parameters as well as for the Final Focus system (FFS) lattice design with respect to the energy upgrade transition to 3 TeV. Both initial and final energy stages were optimized for a short (nominal) and a long L* (6 meters). The long L* option allows the last quadrupole (QD0) to be be located outward of the detector solenoid field influence. FFS optics designs based on the Local chromaticity correction and performance comparisons for both L* options are shown.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR045  
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THPOR030 Commissioning and First Performance Studies of a Single Vertical Beam Halo Collimation System at ATF2 3844
 
  • N. Fuster-Martínez, A. Faus-Golfe
    IFIC, Valencia, Spain
  • P. Bambade, A. Faus-Golfe, S. Wallon, R.J. Yang
    LAL, Orsay, France
  • K. Kubo, T. Okugi, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  • I. Podadera, F. Toral
    CIEMAT, Madrid, Spain
  • T. Tauchi, N. Terunuma
    Sokendai, Ibaraki, Japan
 
  A single vertical beam halo collimation system has been installed in the ATF2 beamline to reduce the background that could limit the precision of the diagnostics located in the post-IP beamline. On this paper the commissioning and first performance studies of a single vertical beam halo collimation system are reported. Furthermore realistic efficiency studies have been done using the simulation code BDSIM and compared with the first experimental tests.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR030  
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THPOR045 Analytical Estimation of ATF Beam Halo Distribution 3888
 
  • D. Wang, J. Gao
    IHEP, Beijing, People's Republic of China
  • P. Bambade
    LAL, Orsay, France
  • T. Naito
    KEK, Ibaraki, Japan
 
  Funding: Work supported by the National Foundation of Natural Sciences (11505198 and 11575218)
Halo distribution is a key topic for background study. This paper has developed an analytical method to give an estimation of ATF beam halo distribution. The equilibrium particle distribution of the beam tail in the ATF damping ring is calculated analytically with different emittance and different vacuum degree. The analytical results agree the measurements very well. This is a general method which can be applied to any electron rings.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR045  
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