Multipole Magnet Arrangement for Barely Separated Beam Control
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Solution Overview
Problem
Existing energy recovery linear accelerators face challenges in independently controlling multiple beams with similar angles traveling through a common transport pipe, as magnets affect both beams simultaneously, leading to loss of bunch quality and increased beam halo, and limited control over lattice tuning parameters.
Innovation Solution
A method involving a magnet arrangement with closely spaced multipole magnets, including at least one odd and one even multipole, allows tuning of magnetic fields to cancel out specific components, enabling independent control of each beam using common magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common magnets are used to transport multiple beams through a common transport pipe, then device complexity is reduced, but independent control of individual beams is lost
Solution Approach 1:
The magnet arrangement is segmented into multiple multipole magnets (at least two) with different pole configurations (odd and even multipoles). Each multipole magnet affects beams differently based on their energy and position, enabling independent control of multiple beams through a common transport pipe while using a single magnet arrangement.
2Volume of moving object
If dipole field strength is increased to separate beams spatially, then beam separation is improved, but beam trajectory geometry changes significantly causing interferences
Solution Approach 1:
Different multipole magnets are designed with specific local properties (odd vs even multipole configurations) that create differentiated magnetic field effects on beams at different positions and energies. This allows spatial separation of beams while maintaining controlled trajectories without significant geometric changes that would cause interferences.
3Volume of stationary object
If multipole magnets are spaced closely together, then space utilization is improved, but magnetic field cancellation control becomes more difficult
Solution Approach 1:
The multipole magnets are configured with asymmetric pole arrangements (combining odd and even multipoles) and spaced at specific asymmetric distances. This asymmetric configuration creates the necessary conditions for selective magnetic field cancellation on specific beams while maintaining compact overall dimensions, balancing space utilization with field control capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables independent focusing and steering of closely spaced beams, correcting chromatic aberrations and improving beam control in multi-pass accelerators, such as CEBAF and FEL, without the need for additional space-consuming magnets.
Implementation Method 1
A dipole with a gradient provides only limited control of the individual split beams. The control is more difficult because control over the magnetic field is more limited.
Implementation Method 2
The method for independent control includes placing a magnet arrangement in the path of the barely separated beams with the magnet arrangement including at least two multipole magnets spaced closely together and having a multipole distribution including at least one odd multipole and one even multipole. The magnetic fields are then tuned to cancel out for a first of the barely separated beams
Data Source
AI summary
A method for achieving independent control of multiple beams in close proximity to one another, such as in a multi-pass accelerator where coaxial beams are at different energies, but moving on a common axis, and need to be split into spatially separated beams for efficient recirculation transport. The method for independent control includes placing a magnet arrangement in the path of the barely separated beams with the magnet arrangement including at least two multipole magnets spaced closely together and having a multipole distribution including at least one odd multipole and one even multipole. The magnetic fields are then tuned to cancel out for a first of the barely separated beams to allow independent control of the second beam with common magnets. The magnetic fields may be tuned to cancel out either the dipole component or tuned to cancel out the quadrupole component in order to independently control the separate beams.