1 / 30

The FERMI Team represented by Stephen V. Milton

The FERMI Team represented by Stephen V. Milton. 4th-Generation?. The ELETTRA Laboratory. Put seeded FEL Here i.e. FERMI@Elettra. 2.0 to 2.4 GeV Synchrotron Radiation Source. Existing 1+ GeV Linac. High Gain Harmonic Generation - HGHG. Bunching at harmonic l.

zelda-carroll
Download Presentation

The FERMI Team represented by Stephen V. Milton

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The FERMI Team represented by Stephen V. Milton

  2. 4th-Generation?

  3. The ELETTRA Laboratory Put seeded FEL Here i.e. FERMI@Elettra 2.0 to 2.4 GeV Synchrotron Radiation Source Existing 1+ GeV Linac

  4. High Gain Harmonic Generation - HGHG Bunching at harmonic l More compact and fully temporally coherent source, control of pulse length, of spectral parameters, and polarization. Li-Hua Yu DUV-FEL

  5. CDR FERMI Beam Parameters

  6. FERMI FEL Output Parameters

  7. Linac Performance Review • Purpose • To access our overall plans for the linac • Are they realistic • Can we do better • If there are limitations what should we do to surmount them • Eg. “Historical” contamination and cleaning

  8. CDR: FERMI Linac Performance Implied Off-crest operational energy of 1.14 GeV

  9. Linac Performance New Goals • Maximum Energy That We Should Plan to • With things as they are 1.5 GeV • If the “SLED phasing” works 1.8 GeV

  10. Linac Performance: Future? • Future Possible Upgrade Paths (Energy and Reliability) • SLED CERN Sections or Add 1 klystron per CERN Section • 7 total installed

  11. “Reach” of FERMI Shown are the fundamental wavelengths. Of course harmonics extend to higher photon energies.

  12. FERMI FEL Output Parameters

  13. FEL II Concept • Basic Philosophy • Push to as short a wavelength (highest energy photons) as possible while maintaining full tunability and variable polarization over the whole tuning range. • Do not worry about generating long pulse lengths • Short pulses preferable by the users • Limit risk by adding one step of additional complexity at a time. • Example • Single Stage HGHG: FEL I • Cascade HGHG with Ti:S seed source: FEL II • Short wavelength seed sources • Harmonic generation in gases • Maintain uniqueness • Seeded, stabilized operation

  14. FEL II Concept • FEL II Wavelength Coverage • Should be able to ensure full coverage over all polarizations from 40 nm (31 eV) to 10 nm (124 eV) • Should, if possible, try to get to 3 nm (413 eV) on the fundamental (stretch goal) and 1 nm (1240 eV) at the third harmonic • R&D Items • Implement next step when more D than R • But do the R for the next step

  15. FEL II Concept • Configurations Explored • SASE • Seeding • Direct • HGHG • Single Stage • Multiple Stage • Seed Sources • Ti:Sapphire with OPA • Harmonic Generation in Gas

  16. FEL II Concept • Harmonic Generation in Gas • Consulted experts • A. L’Huillier • A. De Silvestri • M. Murnane • H. Kapteyn • Direct Seeding • Need 10s of kWatts or better • The higher the power the shorter the undulator and the higher the “signal to noise ratio” (SASE contamination) • Still not easily tunable • But may be able to use a continuum and allow the FEL to differentiate • But can you get 3 nm with any type of reasonable system? • Would like 100 MW or better for effective modulation • May be possible down to roughly 50 to 60 nm. Beyond that no. • Even then flexible wavelength tuning still not proven in the lab • This could allow “single” stage operation down to maybe 3 nm • But really it is a cascade as the HHG system is the first stage • 60/3 is still 20, a big harmonic number

  17. FEL II Concept • Harmonic Generation in Gas (Cont.) • “Low” Harmonic Generation • Might be able to get tunable radiation in the 60 to 70 nm range by looking at a low harmonic driven by a harmonic from the Ti:S • Conclude • One gets many opinions but there are no operational systems that meet the performance criteria that we need. • R&D needs to be done with HHG sources before they can truly be counted on as a primary seed source for the FEL • They will also certainly be the source of choice in the future, but today there is still plenty of R&D to be done. • Final Conclusion as to what FEL II should look like • 2 stage cascage HGHG with upgrade path to HHG

  18. Slide by DeNinno

  19. Energy 1.6GeV Horizontal polarization Slide Provided by G. DeNinno K Period mm good low Gap mm

  20. Energy 1.6GeV Circular polarization Slide Provided by G. DeNinno K Period mm good low Gap mm

  21. Energy 1.6GeV Vertical polarization Slide Provided by G. DeNinno K Period mm good low Gap mm

  22. Slide by DeNinno

  23. DeNinno et al.

  24. FEL II x x FEL2+ at 1.5 GeV FEL2+ at 1.8 GeV

  25. FEL I and FEL II Operations Slide Provided by G. DeNinno

  26. Progress with the PC Gun σx = 0.57 mm σy = 0.65 mm Qbunch= 200 pC Energy = 5.2 MeV (115 MV/m) Emittancey (@1500mm) = 2.2 mm mrad Installation at MAX Lab Laser Profile

  27. Civil Engineering • Civil Construction • Linac Extension to be completed end of February 2009 • “Main FERMI” constuction in review process • Expect Start of construction April 2009

  28. Construction as of Today

  29. “Main FERMI” Construction

  30. Chart provided by Svandrlik

More Related