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RF LINAC for Gamma-ray compton sources

RF LINAC for Gamma-ray compton sources. C. Vaccarezza on behalf of european collaboration. OUTLINE. Gamma Ray Compton Sources New generation source requirements ELI-NP: the European proposal a S-C-band solution : the reference WP the C-band structures the layout

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RF LINAC for Gamma-ray compton sources

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  1. RF LINAC for Gamma-ray compton sources C. Vaccarezza on behalf of european collaboration

  2. OUTLINE • Gamma Ray Compton Sources • New generation source requirements • ELI-NP: the European proposal • a S-C-band solution : • the reference WP • the C-band structures • the layout • the lattice error sensitivity HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  3. Gamma-Ray Compton sources Thanks to the extremelyadvancedcharacteristics: energy,tunability, mono-chromaticity, collimation, brilliance, time rapidity, polarizability etc. the new generation of Compton Sources will play a critical role for advanced applications in: • Nuclear resonance fluorescence • Nuclear photonics:(γ-p) (γ-n) reactions • Medical applications: new medical isotopes production • Material studies • Radioactive waste management and isotope identification • High brilliance Neutron sources HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  4. New generation γ-source:High Phase Space density electron beams vs Lasers • Bright • Mono-chromatic • High Spectral Flux • Tunable • Highly Polarized HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  5. The electron-photon collider approach: Laser e- HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013 The rate of emitted photons is given by: where: leading to:

  6. Within the desired bandwith: L. Serafini collimation system Laser system e- beam A simple model by L. Serafini, V. Petrillo predicts : HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  7. Spectral density SPD: a key parameter For the considered bandwith fRF = repetition rate nRF = bunches per RF pulse UL = Laser pulse energy (J) Q= el. bunch charge (pC) h= laser photon energy=2.4 eV f= collision angle x = e- beam focal rms spot size in mmw0 = laser focal spot size in mm HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  8. Analytical model vs. classical/quantum simulation Number of photons CAIN (quantum MonteCarlo) Run by I.Chaichovska and A. Variola TSST (classical) Developed by P. Tomassini bandwidth Comp_Cross (quantum semianalytical) Developed by V.Petrillo HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013 V. Petrillo

  9. ELI-NP: a new generation γ-ray source HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  10. ELI-NP: the F-I-UK European proposal • European Collaboration for the proposal of the gamma-ray source: • Italy: INFN,Sapienza • France: IN2P3, Univ. Paris Sud • UK: ASTeC/STFC • ~ 80 collaborators elaborating the CDR/TDR HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  11. ELI-NP requirements: + = HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  12. A r.t. RF linac vs pulsed laser source HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  13. The hybrid scheme for the Linac: • Operation criteria: • Long bunch at cathode for high phase space density : • Q/n2 >103pC/(µrad)2 • Short exit bunch (280 µm) for low energy spread (~0.05%) • Advantages: • Moderate risk (state of art RF gun, reduced multibunch operation problems respect to higher frequencies, low compression factor<3) • Economic • Compact (the use of the C-band booster meets the requirements on the available space) • Possibility to use SPARC as test stand

  14. WPref from the photoinjector (Tstep tracking) Egun=120 MV/m E(S1)=E(S2)=21 MV/m Q=250 pC C. Ronsivalle HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  15. C-band structures D. Alesini HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  16. Central cells HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  17. Mitigation of multibunch effect with damped structure D. Alesini HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  18. The machine layout ELI-NP infrastructure N. Bliss HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  19. Linac & Transfer lines Low energy High Energy HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  20. SB-Transverse beam size and distribution (Elegant tracking) Low energy High energy HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  21. WPref_SB-energy spread & current HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  22. Wake on Δx=500 µm M. Migliorati Wake res Q 11000 Wake res Q 100 HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  23. Wake on Δx=500 µm SB Wake res Q 100 HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  24. Lattice error sensitivity:

  25. The Latin Hypercube: • The applied Δx,y affects all the elements at the same time like a real machine • Δx and Δy are applied together • For each sample machine an Elegant input lattice is written with the corresponding errors • The sample machine is runned • The all results are read and plotted • 138 Variables (12*4+28*3+4*3) • -1.0 Δu/u 1.0 • 100 machine runnings

  26. Ex. 10 machines Δu/u distribution:

  27. ΔV= ± 300 kV ΔΦ= 1° HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  28. Δx= ± 80 m HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  29. Δk/kmax= ± 5.0E-4 ΔB/Bmax= ± 1.0E-3 HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  30. All the contributions applied HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013

  31. Conclusions HBEB 2013, San Juan Mar, Puerto Rico |March 25-28, 2013 • A C-band RF linac has been presented based on the requirements of the new generation gamma-ray source in the framework of the ELI-NP project: • The key parameters have been described together with the main aspects of the proposed solution • A lattice sensitivity study has been presented that even if not exhaustive anyway shows acceptable probability margin for the linac routine operation.

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