Author: Blaskovic Kraljevic, N.
Paper Title Page
TUPAB019 A High-Resolution, Low-Latency, Bunch-by-Bunch Feedback System for Nano-Beam Stabilization 1378
 
  • R.L. Ramjiawan, D.R. Bett, N. Blaskovic Kraljevic, T. Bromwich, P. Burrows, G.B. Christian, C. Perry
    JAI, Oxford, United Kingdom
  • D.R. Bett
    CERN, Geneva, Switzerland
  • N. Blaskovic Kraljevic
    ESS, Lund, Sweden
  • G.B. Christian
    DLS, Oxfordshire, United Kingdom
 
  A low-latency, bunch-by-bunch feedback system employing high-resolution cavity Beam Position Monitors (BPMs) has been developed and tested at the Accelerator Test Facility (ATF2) at the High Energy Accelerator Research Organization (KEK), Japan. The feedback system was designed to demonstrate nanometer-level vertical stabilization at the focal point of the ATF2 and can be operated using either a single BPM to provide local beam stabilization, or by using two BPMs to stabilize the beam at an intermediate location. The feedback correction is implemented using a stripline kicker and the feedback calculations are performed on a digital board constructed around a Field Programmable Gate Array (FPGA). The feedback performance was tested with trains of two bunches, separated by 280ns, at a charge of ~1nC, where the vertical offset of the first bunch was measured and used to calculate the correction to be applied to the second bunch. The BPMs have been demonstrated to achieve an operational resolution of ~20nm. With the application of single-BPM and two-BPM feedback, beam stabilization of below 50nm and 41nm respectively has been achieved with a latency of 232ns.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB019  
About • paper received ※ 18 May 2021       paper accepted ※ 09 June 2021       issue date ※ 14 August 2021  
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TUPAB175 ESSnuSB Linac and Transfer Line: Lattice Design and Error Studies 1805
 
  • N. Blaskovic Kraljevic, M. Eshraqi, B.T. Folsom
    ESS, Lund, Sweden
 
  Funding: ESSnuSB has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.
The ESS neutrino superbeam (ESSnuSB) project is being studied as an upgrade to the European Spallation Source (ESS). This proposed upgrade consists of adding an H source to the existing beamline in order to send H pulses in between proton pulses, effectively doubling the beam power from 5 MW to 10 MW. In this contribution, we present the 2.5 GeV linear accelerator (linac) lattice and the design of the transfer line from the linac to the accumulator ring, where pulses would be stacked to achieve short proton pulses of high intensity. The results of error studies, quantifying the effect of accelerator imperfections and H ion stripping losses on the beam transport through the linac and transfer line, are also presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB175  
About • paper received ※ 19 May 2021       paper accepted ※ 14 June 2021       issue date ※ 31 August 2021  
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TUPAB176 ESS Proton Beam Trajectory Correction 1809
 
  • N. Blaskovic Kraljevic, M. Eshraqi, N. Milas, R. Miyamoto
    ESS, Lund, Sweden
 
  The proton linac of the European Spallation Source (ESS) is under construction in Lund, Sweden. Beam trajectory correction is essential to mitigate the effect of accelerator element misalignment, constituting the first step to minimise beam losses. The correction will be performed using correctors distributed along the accelerator, based on the beam position monitor (BPM) readout. Three trajectory correction techniques are considered: one-to-one steering, Singular Value Decomposition (SVD), and MICADO (selecting a subset of correctors for the trajectory correction). The performance of the three methods is simulated for the ESS linac and a comparison of the outcomes is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB176  
About • paper received ※ 19 May 2021       paper accepted ※ 15 June 2021       issue date ※ 27 August 2021  
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