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Ribbon Electron Beam Profile Monitor For Bunched Beam Tomog Ribbon Electron Beam Profile Monitor For Bunched Beam Tomog

Ribbon Electron Beam Profile Monitor For Bunched Beam Tomog - PowerPoint Presentation

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Ribbon Electron Beam Profile Monitor For Bunched Beam Tomog - PPT Presentation

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

electron beam national ribbon beam electron ribbon national profile cathode strip tomography gun neutron extraction beams proton voltage accelerator

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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)