Merit functions for the linac optics design for colliders and light sources

Abstract Optics matching and transverse emittance preservation are key goals for a successful operation of modern high brightness electron linacs. The capability of controlling them in a real machine critically relies on a properly designed magnetic lattice. Conscious of this fact, we introduce an ensemble of optical functions that permit to solve the often neglected conflict between strong focusing, typically implemented to counteract coherent synchrotron radiation and transverse wakefield instability, and distortion of the transverse phase space induced by chromatic aberrations and focusing errors. A numerical evaluation of merit functions is applied to existing and planned linac-based free electron lasers.

[1]  S. Di Mitri,et al.  Cancellation of coherent synchrotron radiation kicks with optics balance. , 2013, Physical review letters.

[2]  J. Kirz,et al.  Design Studies for a VUV–Soft X-ray Free-Electron Laser Array , 2009 .

[3]  M. Pedrozzi,et al.  Designing a Bunch Compressor Chicane for a Multi-TeV Linear Collider , 2007 .

[4]  A. Nihat Berker,et al.  Erratum: ``Random-field mechanism in random-bond multicritical systems'' [Phys. Rev. Lett. 62, 2507 (1989)] , 1989 .

[5]  J. Jeanneret.  Optics of a two-stage collimation system , 1998 .

[6]  Bernhard Schmidt,et al.  Time-Resolved Electron Beam Phase Space Tomography at a Soft X-Ray Free-Electron Laser , 2009 .

[7]  Mikhail Yurkov,et al.  On the coherent radiation of an electron bunch moving in an arc of a circle , 1997 .

[8]  E. Saldin,et al.  Klystron instability of a relativistic electron beam in a bunch compressor , 2002 .

[9]  P. Craievich,et al.  Transverse emittance preservation during bunch compression in the Fermi free electron laser , 2012 .

[10]  T. Raubenheimer.  Estimates of Emittance Dilution and Stability in High-Energy Linear Accelerators , 2000 .

[11]  Influence of longitudinally tapered collimators on a high brightness electron beam , 2012 .

[12]  Kwang-Je Kim,et al.  Formulas for coherent synchrotron radiation microbunching in a bunch compressor chicane , 2002 .

[13]  Theory of single bunch stability and dynamics in linacs with strong wakefields and misalignments , 1999 .

[14]  Samuel Krinsky,et al.  Coherent synchrotron radiation instability in a bunch compressor , 2002 .

[15]  Talman.  Novel relativistic effect important in accelerators. , 1986, Physical review letters.

[16]  William A. Barletta,et al.  Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet , 2012, Nature Photonics.

[17]  Raubenheimer,et al.  Emittance growth during bunch compression in the CTF-II , 2000, Physical review letters.

[18]  Anthony Papagiannis.  Intern , 2010, BMJ : British Medical Journal.

[19]  I. Agapov,et al.  Tracking studies of the Compact Linear Collider collimation system , 2009 .