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Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility 1 Radiation Damping - Low emittance lattices USPAS, Hampton, VA, Jan. 17-28, 2011 Alex Bogacz ,Geoff Krafft and Hisham Sayed

Radiation Damping - Low emittance latticescasa.jlab.org/publications/viewgraphs/USPAS2011/USPAS2011Lect17.pdfOperated by JSA for the U.S. Department of Energy Thomas Jefferson National

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Page 1: Radiation Damping - Low emittance latticescasa.jlab.org/publications/viewgraphs/USPAS2011/USPAS2011Lect17.pdfOperated by JSA for the U.S. Department of Energy Thomas Jefferson National

Operated by JSA for the U.S. Department of Energy

Thomas Jefferson National Accelerator Facility

http://cas.web.cern.ch/cas/Germany2009/Lectures/PDF-Web/Wolski-1.pdf1

Radiation Damping - Low emittance

lattices

USPAS, Hampton, VA, Jan. 17-28, 2011

Alex Bogacz ,Geoff Krafft and Hisham Sayed

Page 2: Radiation Damping - Low emittance latticescasa.jlab.org/publications/viewgraphs/USPAS2011/USPAS2011Lect17.pdfOperated by JSA for the U.S. Department of Energy Thomas Jefferson National

Operated by JSA for the U.S. Department of Energy

Thomas Jefferson National Accelerator Facility

http://cas.web.cern.ch/cas/Germany2009/Lectures/PDF-Web/Wolski-1.pdf2

Outline

Beam dynamics with synchrotron radiation:

Discuss the effect of synchrotron radiation on the (linear) motion of particles

in storage rings.

Define action-angle variables for describing symplectic motion of a particle

along a beam line.

Derive expressions for the damping times of the vertical, horizontal and

longitudinal emittances.

Introduce the synchrotron radiation integrals (Sand’s Integrals).

Discuss the effects of quantum excitation, and derive expressions for the

equilibrium horizontal and longitudinal beam emittances in an electron

storage ring.

M. Sands, “The physics of electron storage rings, an introduction” SLAC-121. 1970

A. Wolski, University of Liverpool and the Cockcroft Institute, CAS 2009,

http://cas.web.cern.ch/cas/Germany2009/Lectures/PDF-Web/Wolski-1.pdf

USPAS, Hampton, VA, Jan. 17-28, 2011

Page 3: Radiation Damping - Low emittance latticescasa.jlab.org/publications/viewgraphs/USPAS2011/USPAS2011Lect17.pdfOperated by JSA for the U.S. Department of Energy Thomas Jefferson National

Operated by JSA for the U.S. Department of Energy

Thomas Jefferson National Accelerator Facility

http://cas.web.cern.ch/cas/Germany2009/Lectures/PDF-Web/Wolski-1.pdf3

Outline – cont.

Equilibrium emittance and storage ring lattice design

Emittance preserving lattices :

The natural emittance for different types of lattice - Examples:

FODO

Double Bend Achromat (DBA)

Theoretical Minimum Emittance (TME)

USPAS, Hampton, VA, Jan. 17-28, 2011

Page 4: Radiation Damping - Low emittance latticescasa.jlab.org/publications/viewgraphs/USPAS2011/USPAS2011Lect17.pdfOperated by JSA for the U.S. Department of Energy Thomas Jefferson National

Operated by JSA for the U.S. Department of Energy

Thomas Jefferson National Accelerator Facility

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Coordinate system

Page 5: Radiation Damping - Low emittance latticescasa.jlab.org/publications/viewgraphs/USPAS2011/USPAS2011Lect17.pdfOperated by JSA for the U.S. Department of Energy Thomas Jefferson National

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Longitudinal coordinate

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Energy deviation

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Canonical variables

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Symplectic matrices

U U

U

U

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Twiss parameters and the particle action

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Cartesian variables and action-angle variables

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Action and Emittance

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Action and Radiation

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Radiation damping of vertical emittance

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Radiation damping of vertical emittance

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Radiation damping of vertical emittance

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Radiation damping of vertical emittance

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Thomas Jefferson National Accelerator Facility

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Radiation damping of vertical emittance

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Synchrotron radiation energy loss

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Synchrotron radiation energy loss

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The first synchrotron radiation integral

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Damping of horizontal emittance

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Horizontal-longitudinal coupling

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Damping of horizontal emittance

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Operated by JSA for the U.S. Department of Energy

Thomas Jefferson National Accelerator Facility

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Radiation damping of horizontal emittance

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Operated by JSA for the U.S. Department of Energy

Thomas Jefferson National Accelerator Facility

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Appendix A: Damping of horizontal emittance

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Appendix A: Damping of horizontal emittance

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Appendix A: Damping of horizontal emittance

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Appendix A: Damping of horizontal emittance

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Appendix A: Damping of horizontal emittance

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Appendix A: Damping of horizontal emittance

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Damping of synchrotron oscillations

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Damping of synchrotron oscillations

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Thomas Jefferson National Accelerator Facility

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Damping of synchrotron oscillations

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Thomas Jefferson National Accelerator Facility

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Damping of synchrotron oscillations

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Thomas Jefferson National Accelerator Facility

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Damping of synchrotron oscillations

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Thomas Jefferson National Accelerator Facility

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Damping of synchrotron oscillations

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Thomas Jefferson National Accelerator Facility

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Damping of synchrotron oscillations

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Thomas Jefferson National Accelerator Facility

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Damping of synchrotron oscillations

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Thomas Jefferson National Accelerator Facility

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Damping of synchrotron oscillations

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Summary: synchrotron radiation damping

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Quantum excitation

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Quantum excitation of horizontal emittance

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Quantum excitation of horizontal emittance

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Appendix B: Quantum excitation of horizontal emittance

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Appendix B: Quantum excitation of horizontal emittance

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Appendix B: Quantum excitation of horizontal emittance

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Appendix B: Quantum excitation of horizontal emittance

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Quantum excitation of horizontal emittance

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Quantum excitation of vertical emittance

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Quantum excitation of synchrotron oscillations

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Quantum excitation of synchrotron oscillations

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Natural energy spread

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Summary: radiation damping

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Summary: synchrotron radiation integrals

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Summary: synchrotron radiation integrals

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Radiation Damping - Re-cap

So far we:

discussed the effect of synchrotron radiation on the (linear) motion of

particles in storage rings;

derived expressions for the damping times of the vertical, horizontal

and longitudinal emittances;

discussed the effects of quantum excitation, and derive expressions

for the equilibrium horizontal and longitudinal beam emittances in an

electron storage ring.

USPAS, Hampton, VA, Jan. 17-28, 2011

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S-R integrals - Re-cap

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S-R integrals - Re-cap

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Lattice Examples

Practical implementations:

FODO

DBA (double-bend achromat)

multi-bend achromat, including the triple-bend achromat (TBA)

TME (theoretical minimum emittance)

USPAS, Hampton, VA, Jan. 17-28, 2011

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Calculating the natural emittance in a lattice

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FODO lattice - natural emittance

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FODO lattice - natural emittance

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FODO lattice - natural emittance

1

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FODO lattice - natural emittance

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FODO lattice - natural emittance

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FODO lattice - natural emittance

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FODO lattice - natural emittance

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FODO lattice - natural emittance

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FODO lattice - natural emittance

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FODO lattice - natural emittance

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DBA lattice - natural emittance

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DBA lattice - natural emittance

1

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DBA lattice - natural emittance

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DBA lattice - natural emittance

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DBA lattice - natural emittance

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DBA lattice - natural emittance

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TME lattice - natural emittance

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TME lattice - natural emittance

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TME lattice - natural emittance

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TME lattice - natural emittance

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Summary: FODO, DBA and TME lattices

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Design for low emittance lattices

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Summary

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Summary cont.