Muons Inc Innovation in research The Problem Bunched Beam Tomography Advanced accelerator beam diagnostics are essential for user facilities that require intense proton beams with small emittances ID: 231309
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Slide1
Ribbon Electron Beam Profile Monitor For Bunched Beam Tomography
Muons, Inc.
Innovation in researchSlide2
The Problem: Bunched Beam Tomography
Advanced accelerator beam diagnostics are essential for user facilities that require intense proton beams with small emittances and high reliability.
Important to have noninvasive diagnostics that can be used continuously with intense accelerated beams.
Determination of particle distributions within an RF bunch is one of the most difficult tasks of all.
Muons, Inc. Ribbon Electron Beam Profile Monitor (RPBM) For Bunched Beam Tomography can address the challenges.
Slide3
The Solution: Ribbon Electron Beam Profile Monitor for Bunched Beams
A short pulse of the extraction voltage can be used to produce a short time-slice of the ribbon beam. After crossing the proton bunch with an angle close to 45o, the deflected electrons are visualized on the luminescent screen (7) and recorded by a fast CCD camera for further processed by corresponding software. Several similar systems can be integrated for production of the
tomographic
3-D image of proton bunches.
Schematic diagram of a Ribbon
e
-Beam Profile Monitor with a strip cathode. 1- strip cathode; 2-extractor; 3-anode with first slit of collimator; 4-deflecting plate; 5-second slit of collimator; 6-ribbon time- slice of electron probe; 7-luminiscent screen.Slide4
RPBM AdvantagesInstead of scanning with a pencil electron beam as used in previous profile monitors, a novel strip cathode is used to form a sheet or ribbon beam of electrons to measure the density of a passing bunch of particles.
The strip cathode apparatus eliminates the need for quadrupoles, is smaller with simpler design, is less expensive to manufacture, and has better magnetic shielding, higher sensitivity, and higher spatial and time resolutions.
With this device, almost ideal tomography of bunches is possible in linear accelerators, circular accelerators, and storage rings. Slide5
The Impact of the Technology
The detailed measurements enabled by the REPBM are important for optimizing high intensity beam accumulation and acceleration and for suppressing instabilities in order to increase beam luminosity and lifetime. The facilities that this will impact are:
Spallation
Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL),
Los Alamos Neutron Science Center (LANSCE) at LANL,
Project-X at the Fermi National Accelerator Laboratory
Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL), National Superconducting Cyclotron Lab and Facility for Radioactive Ion Beams (FRIB) at MSU, Facility for Antiprotons and Ion Research (FAIR) at GSI, Darmstadt, Germany,Japan Proton Accelerator Research Complex (J-PARC) in Japan and Project-X, and next-generation projects at Fermi National Accelerator Lab (
Fermilab
)
European
Spallation
Neutron Source (ESS) in Lund, Sweden
Chinese
Spallation
Neutron Source at
Dongguan
in Guangdong province, China
MYRRHA: Multi-purpose hybrid research reactor for high-tech applications, in Mol, Belgium
Slide6
RPBM: Simulation of Electron Beam Formation
Edge view of the strip cathode electron gun showing the simulation of ribbon electron beam extraction, acceleration, and focusing by the deflector plates (extraction voltage
Uex
=10 kV, Accelerating voltage
Ua
=100 kV, focusing voltage on the deflector system is
Uf
=-5 kV). Red lines are electron trajectories, green lines are
equipotentials
. The scale is 1 mm/division. Slide7
RBPM Mechanical Design
Full System Mechanical Model
electron-gun
Electron-gun, extraction electrode,
accelerating anode and deflection platesSlide8
RBPM Component Tests
Electron-gun test in vacuum chamber
Ribbon electron beam on
luminescent screenSlide9
Next Steps
Ready to move to: System fabrication and beam testing Tomography development and readout
Collaboration with National Instruments
Based on PXI & NI
FlexRIO
technology (FPGA)