Abstract
Saclay CEA/IRFU is working for the delivery of five Non-Invasive Profile Monitors in the frame of the in-kind contribution agreement signed with the European Spallation Source. Neutrons will be produced by spallation reactions of 2 GeV proton beam impinging on a Tungsten target. To accelerate protons a powerful linear accelerator of 5MW is under construction. Diagnostic devices are mandatory tools for the tuning and protection of the machine. The non-invasive profile monitors provide a measurement of the beam profile in transverse directions to the beam propagation. This project raises several physical and technical challenges including low signal detection of ions or electrons, profile distortions induced by the beam Space Charge effect and non-uniformities of electric field. Simulation and model of the critical aspects of the detector have been performed in order to prove the performance and the feasibility of the detector. A series of prototypes has been built with different readout types, and tested in real conditions at the 3MeV proton accelerator IPHI. All of them show some advantages and drawbacks revealed by the tests in real beam conditions. In this paper we present the results of the tests for the various configuration readout systems to agree with the model and simulation of the detector. In concluding remarks, we will discuss the performance of the prototypes and point out the camerabased one to be the more suitable for the final design.
Highlights
T HE European Spallation Source (ESS) will be a European research infrastructure dedicated to neutronic science
The production of neutrons is ensured by the spallation process: high energy protons will impinge on a tungsten target
An Ionization Profile Monitor (IPM) is a non-invasive detector that measures the transverse profile of a beam
Summary
T HE European Spallation Source (ESS) will be a European research infrastructure dedicated to neutronic science. The production of neutrons is ensured by the spallation process: high energy protons will impinge on a tungsten target. At ESS, both invasive and non-invasive profilers will be installed along the accelerator. The invasive measurements are mainly done with wire scanners. These devices cannot handle the huge beam peak power of ESS at nominal conditions (125 MW), and will be only used at low beam duty cycle [2]. Non invasive Profile Monitors (NPM) will take over for higher beam power. Fluorescence Profile Monitors (FPM) [3] are foreseen in the ”warm” parts of the accelerator whereas Ionization Profile Monitors (IPM) will be implemented exclusively in the cryogenic part of the accelerator. Energy Pulse current Pulse duration Repetition rate Duty cycle Power (peak) Radio Frequencies. The different technologies of detection, presented just before, have been reviewed in order to select the most efficient one with respect to the ESS requirements
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call