Author: Kowina, P.
Paper Title Page
MO2AB1
 Beam Measurements Using Schottky Signal Analysis  
 
  • P. Forck, P. Kowina, R. Singh
    GSI, Darmstadt, Germany
  • M. Wendt
    CERN, Geneva, Switzerland
  
  Schottky signal analysis is a non-invasive beam measurement method based on the observation of the electromagnetic properties of individual beam particles. It allows the determination of important parameters such as momentum spread, synchrotron tune, coherent and incoherent betatron tune, and chromaticity for coasting and bunched beams at hadron synchrotrons. It is a popular diagnostic at low energy ion storage rings as well as implemented for bunched beams in high energy synchrotrons such as LHC. In this tutorial, the underlying physics for the observables will be described together with the basic mathematics. Recent results for high intensity beam will be discussed. The detector technology, based on capacitive pick-ups, traveling wave structures, or cavities is addressed, as well as the associated rf electronics to extract this weak, beam induced Schottky signal. Applications ranging from the daily operational usage up to dedicated machine physics investigations on a very wide range of beam parameters will be discussed.  
slides icon Slides MO2AB1 [13.493 MB]  
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TH2AB3 Optimization of the Cryogenic Current Comparator (CCC) for Beam Intensity Measurement 503
 
  • T. Sieber, P. Kowina, F. Kurian, H. Reeg, M. Schwickert, T. Stöhlker
    GSI, Darmstadt, Germany
  • H. De Gersem, N. Marsic
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M.F. Fernandes, R.J. Jones, L. Søby, J. Tan, G. Tranquille
    CERN, Geneva, Switzerland
  • J. Golm, R. Neubert, F. Schmidl, P. Seidel, V. Tympel
    FSU Jena, Jena, Germany
  • M. Schmelz, R. Stolz
    IPHT, Jena, Germany
  • T. Stöhlker
    HIJ, Jena, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • V. Zakosarenko
    Supracon AG, Jena, Germany
  
  Funding: Work supported by the German Federal Ministry of Research under contract No. 05P15SJRBA
Triggered by the need for current measurement in the nA range for slow extracted beams and for the beams in the storage rings at FAIR and CERN, the idea of the CCC as a current transformer has been revitalized during the last ten years. Compared to the first prototype, developed at GSI in the 90s, the second generation of CCCs is based on the possibility of detailed simulation of superconducting magnetic shielding properties, new nano-crystalline materials for the magnetic ring-cores, and on superior commercially available SQUID systems. In 2014, nA resolution measurements at 2 kHz bandwidth demonstrated the possibility of spill analysis at slow extracted beams from GSI SIS18. In the following year, the first stand-alone CCC system, including a cryostat with separate He liquefier, started operation in the CERN AD. Although the existing systems show an outstanding current resolution, their cost efficiency and robustness, as well as noise and vibration sensitivity can still be improved, which is subject of ongoing research. In this contribution recent results of our CCC tests are shown and future developments are discussed. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TH2AB3  
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