METHODS FOR MEASURING THE BEAM PROFILE IN HIGH

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

EUROPEAN SPALLATION SOURCE An European multi-disiplinary research centre based on the world’s most powerful neutron source Accelerator LINAC Particle Proton Max Energy 2 Ge. V Power 5 MW Current 62. 2 m. A Pulse length 2. 86 ms Pulse frequency 14 Hz Hosted by Sweden (source facility) and Danemark (data management facility)

SITE Start the construction this year !!

ACCELERATOR 2. 4 m Source LEBT 75 ke. V 4. 6 m RFQ 352. 21 MHz 3. 8 m 39 m MEBT DTL 3. 6 Me. V 56 m 77 m Spokes Medium β 90 Me. V 216 Me. V 179 m High β 571 Me. V Cold linac Warm linac Deadline for the transverse beam profile monitors 704. 42 MHz 2019: Start operation with linac completed up to medium β 600 Me. V 2020: Reach > 1 MW 2022: Install high β 2025: Full project specifications: 5 MW, 2 Ge. V HEBT & Contingency 2000 Me. V Target

Non-invasive Profile Monitor (NPM) 2. 4 m Source LEBT 75 ke. V 4. 6 m RFQ 352. 21 MHz 3. 8 m 39 m MEBT DTL 3. 6 Me. V 1 56 m 77 m Spokes Medium β 90 Me. V 2 1 Warm linac 704. 42 MHz 216 Me. V 1 179 m High β 571 Me. V 3 HEBT & Contingency 2000 Me. V 1 4 Cold linac Use the interaction between the beam and the residual gas (Hydrogen) 10 -7 - 10 -8 mbar Luminescence profile monitor 10 -9 mbar Ionisation profile monitor Target

NPM – Luminescence Profile Monitor m ea nb Io rt po w e Vi (1) • Space of 10 cm maximum • 10 -7 - 10 -8 mbar (1) Picture Setup@ Zerstörungsfreie Profilmessung intensiver Schwerionenstrahlen, Frank Becker, Darmstadt, 2010

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

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

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

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