Author: Donegani, E.M.
Paper Title Page
MOPP014 Design of the ESS MEBT Faraday Cup 105
 
  • A. Rodríguez Páramo, I. Bustinduy, I. Mazkiaran, R. Miracoli, V. Toyos, S. Varnasseri, D. de Cos, C. de la Cruz
    ESS Bilbao, Zamudio, Spain
  • E.M. Donegani, J.P.S. Martins
    ESS, Lund, Sweden
 
  The European Spallation Source (ESS) is currently under construction and the Medium Energy Beam Transfer (MEBT) is developed by ESS-Bilbao as an in-kind contribution. In the MEBT a set of diagnostics is included for beam characterization, among them the MEBT Faraday Cup is used to measure beam current and as a beam stopper for the commissioning modes. The main challenges for the design and manufacturing of the Faraday Cup are the high irradiation loads and the necessity of a compact design due to the space constraints in the MEBT. We describe the design of the FC, characterized by a graphite collector, required to withstand irradiation, and a repeller for suppression of secondary electrons. For the operation of the Faraday Cup acquisition electronics and control system are developed, all systems have been integrated in the ESS-Bilbao ECR ion source to test operation under beam conditions. In this work, we discuss the design of the Faraday Cup, the results of the tests and how they agree with the expected performance of the Faraday Cup.  
poster icon Poster MOPP014 [1.786 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP014  
About • paper received ※ 02 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOPP044 Status of the Faraday Cups for the ESS linac 206
 
  • E.M. Donegani, C.S. Derrez, T.J. Grandsaert, T.J. Shea
    ESS, Lund, Sweden
  • I. Bustinduy, A. Rodríguez Páramo
    ESS Bilbao, Zamudio, Spain
 
  The European Spallation Source (ESS) will be a 5 MW pulsed neutron source, relying on a 2 GeV linac delivering 2.86 ms long pulses with 14 Hz repetition rate. During the commissioning and the tuning phases of the ESS linac, four Faraday Cups (FC) serve as beam dumps and provide an absolute measurement of the proton beam current. This contribution summarizes the challenges in the design and production of all the FCs mainly requiring: - Thermo-mechanical analysis to keep heat load and mechanical stress below the mechanical limits; - Inclusion of an electron repeller to prevent the escape of secondary charged particles from the cup that would limit the accuracy of the current measurements; - Monte Carlo simulations to compute material activation, dose at contact and corresponding necessary shielding; - Design of high-resolution detection circuits for low current to fulfill the requirements on bandwidth, gain and noise. In addition, the performance of the LEBT FC during the commissioning of the ion source and LEBT is reported. The LEBT FC system is under continuous improvement and serves as benchmark for the protection from unwanted operation, and in case of actuator or cooling faults.  
poster icon Poster MOPP044 [1.121 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP044  
About • paper received ※ 04 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)