METHODS FOR MEASURING THE BEAM PROFILE IN HIGH INTENSITY BEAMS

Charlotte Roosewww.europeanspallationsource.se

May 8, 2014

EUROPEAN SPALLATION SOURCE

An European multi-disiplinary research centre based on the world’s most powerful neutron source

Accelerator LINACParticle Proton

Max Energy 2 GeV

Power 5 MW

Current 62.2mA

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

Spokes Medium β High βDTLMEBTRFQLEBTSource HEBT & Contingency Target

2.4 m

4.6 m

3.8 m

39 m

56 m

77 m

179 m

75 keV

3.6 MeV 90 MeV 216

MeV571 MeV

2000 MeV

352.21 MHz

704.42 MHz

2019: Start operation with linac completed up to medium β 600 MeV

2020: Reach > 1MW

2022: Install high β

2025: Full project specifications: 5MW, 2 GeV

Warm linac Cold linac

Deadline for the transverse beam profile monitors

Non-invasive Profile Monitor (NPM)

Spokes Medium β High βDTLMEBTRFQLEBTSource HEBT &

Contingency Target

2.4 m

4.6 m

3.8 m

39 m

56 m

77 m

179 m

75 keV

3.6 MeV 90 MeV 216

MeV571 MeV

2000 MeV

352.21 MHz

704.42 MHz

10-7 - 10-8 mbar 10-9mbar

Luminescence profile monitor Ionisation profile monitor

Use the interaction between the beam and the residual gas (Hydrogen)

Warm linac Cold linac

1 112 413

NPM – Luminescence Profile Monitor

• Space of 10 cm maximum• 10-7 - 10-8 mbar

Ion beam

Viewport

(1) Picture Setup@ Zerstörungsfreie Profilmessung intensiver Schwerionenstrahlen, Frank Becker, Darmstadt, 2010

(1)

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

(1)

NPM – Ionisation Profile Monitor

(1) Picture Setup@GSI, T. Giacomini

(1)

SPACE CHARGE EFFECT

With the 60kV/10cm, the ion deviation of 10% for a 1 GeV beam of 2mm diameter

∆5cm

Other options• Increase the electric field• Use an additional magnetic field

NPM

(1) Picture Setup@GSI, T. Giacomini

(1)

RADATION HARDNESS

• Decision of components depend of their liftime : • Viewport• Luminescence screen • Camera, PMT

Thank you for your attention