the RAL Front End Test Stand David Lee Outline The RAL Front End - - PowerPoint PPT Presentation
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand David Lee Outline The RAL Front End Test Stand The Need for Non-Destructive, Non-Interceptive Diagnostics Laser-Based H Beam Diagnostics: Basic Principle
David Lee
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 1 David Lee • 02/04/2007
The RAL Front End Test Stand The Need for Non-Destructive, Non-Interceptive Diagnostics Laser-Based H− Beam Diagnostics: Basic Principle The Approach Taken Progress Made: Particle Transport Simulations Laser Characterisation Conclusions and Outlook
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 2 David Lee • 02/04/2007
Magnetic LEBT RFQ MEBT and chopper H- ion source Laser profile monitor
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 3 David Lee • 02/04/2007
Magnetic LEBT RFQ MEBT and chopper H- ion source Laser profile monitor
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 4 David Lee • 02/04/2007
Allows for online monitoring of the beam
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 5 David Lee • 02/04/2007
Plastic Ruby P46
Allows for online monitoring of the beam Prevents the beam damaging the instrument
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 6 David Lee • 02/04/2007
Photo-dissociate some
Separate species using a dipole magnet
−
− − −
− − − − − − − − − − − − − − − −
− − −
− − − − − − −
Collect the detached electrons
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 7 David Lee • 02/04/2007
Photo-dissociate some
Separate species using a dipole magnet
−
− − −
− − − − − − − − − − − − − − − −
− − −
Collect the detached electrons
− − − − − − −
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 8 David Lee • 02/04/2007
Photo-dissociate some
Separate species using a dipole magnet
−
− − −
− − − − − − − − − − − − − − − −
− − −
Collect the detached electrons
− − − − − − −
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 9 David Lee • 02/04/2007
Photo-dissociate some
Separate species using a dipole magnet
−
− − −
− − − − − − − − − − − − − − − −
− − −
Collect the detached electrons
− − − − − − −
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 10 David Lee • 02/04/2007
Photo-dissociate some
Separate species using a dipole magnet
−
− − −
− − − − − − − − − − − − − − − −
− − −
Collect the detached electrons
− − − − − − −
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 11 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 12 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 13 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 14 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 15 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 16 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 17 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 18 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 19 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 20 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 21 David Lee • 02/04/2007
2.6% change in spot size at edge of ion beam Maximum ion beam size 1 mm at focus
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 22 David Lee • 02/04/2007
Non-destructive diagnostics are essential for high-power ion beams Laser-based diagnostics are a solution Progress towards installation and operation of a laser-based beam density distribution diagnostic for the RAL Front End Test Stand is going well Electromagnetic simulations show efficient electron collection Laser characterisation shows that a good resolution can be reached Installation and first measurements are on schedule for the summer
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 24 David Lee • 02/04/2007
The RAL Front End Test Stand is being constructed to demonstrate the production of a 60 mA, 3 MeV, 50 pps, chopped H- beam suitable for future high-power proton accelerators. Due to the high beam brightness and a desire to have online instrumentation while the accelerator is operational, a series of non- intrusive, non-destructive diagnostics, based on the photo-detachment of the outer electrons of the H- ions, are being developed. This talk describes a device that will measure the 2D ion beam density distribution, due to be installed in the summer.
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 25 David Lee • 02/04/2007
H− from Linac Circulating protons Stripping foil
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 26 David Lee • 02/04/2007
Photo-dissociate some
Separate species using a dipole magnet
−
− − −
− − − − − − − − − − − − − − − −
− − −
Collect the detached electrons
− − − − − − −
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 27 David Lee • 02/04/2007
Two channel, integrate and hold, 20-bit ADC Minimum sensitivity: −0.2–50 pC Expected signal size ~1 pC so in effect we have a ~ 14-bit ADC
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 28 David Lee • 02/04/2007
A Laser-Based Beam Density Distribution Diagnostic for the RAL Front End Test Stand • 29 David Lee • 02/04/2007