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Innovative Methods for Measuring Beam Profile in High-Intensity Beams at European Spallation Source

This document outlines advanced methods for measuring beam profiles in high-intensity beams, focusing on non-invasive profile monitors (NPM) utilized at the European Spallation Source (ESS). It emphasizes the importance of accurate profiling across various stages of the accelerator, including LEBT, RFQ, MEBT, and more. Techniques discussed include ionization and luminescence profile monitoring, utilizing interactions with residual gases at different vacuum levels. The document presents setups, spatial constraints, and radiation hardness considerations essential for equipment decisions and effective beam diagnostics.

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Innovative Methods for Measuring Beam Profile in High-Intensity Beams at European Spallation Source

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  1. METHODS FOR MEASURING THE BEAM PROFILE IN HIGH INTENSITY BEAMS Charlotte Roose www.europeanspallationsource.se May 8, 2014

  2. EUROPEAN SPALLATION SOURCE An European multi-disiplinary research centre based on the world’s most powerful neutron source Hosted by Sweden (source facility) and Danemark (data management facility)

  3. SITE Start the construction this year !!

  4. ACCELERATOR 352.21 MHz 704.42 MHz 2.4 m 4.6 m 3.8 m 39 m 56 m 77 m 179 m Target High β Source LEBT RFQ MEBT DTL Spokes Medium β HEBT & Contingency 75 keV 3.6 MeV 90 MeV 216 MeV 571 MeV 2000 MeV Cold linac Warm linac Deadline for the transverse beam profile monitors

  5. Non-invasive Profile Monitor (NPM) 352.21 MHz 704.42 MHz 2.4 m 4.6 m 3.8 m 39 m 56 m 77 m 179 m Target High β Source LEBT RFQ MEBT DTL Spokes Medium β HEBT & Contingency 75 keV 3.6 MeV 90 MeV 216 MeV 571 MeV 2000 MeV 1 2 1 1 3 1 4 Cold linac Warm linac Use the interaction between the beam and the residual gas (Hydrogen) 10-7 - 10-8 mbar 10-9mbar Ionisation profile monitor Luminescence profile monitor

  6. NPM – Luminescence Profile Monitor Ionbeam Viewport (1) • Space of 10 cm maximum • 10-7 - 10-8mbar Picture Setup@ Zerstörungsfreie Profilmessung intensiver Schwerionenstrahlen, Frank Becker, Darmstadt, 2010

  7. NPM – Ionisation Profile Monitor • 40 cm of space or less • Dimension = 10cm x10cm x 10cm • Electric field of 60kV/10cm • 10-9mbar (1) • Picture Setup@GSI, T. Giacomini

  8. NPM – Ionisation Profile Monitor SPACE CHARGE EFFECT With the 60kV/10cm, the ion deviation of 10% for a 1 GeV beam of 2mm diameter • Other options • Increase the electric field • Use an additional magnetic field 5cm ∆ (1) • Picture Setup@GSI, T. Giacomini

  9. NPM RADATION HARDNESS • Decision of components depend of their liftime : • Viewport • Luminescence screen • Camera, PMT (1) • Picture Setup@GSI, T. Giacomini

  10. Thank you for your attention

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