SPARC status and plans Massimo Ferrario on behalf of the sparc team

1. SPARC status and plans Massimo Ferrario on behalf of the sparc team 37th LNF Scientific Committee Meeting - 1 December 08

2. 2008 activity Beam Matching Cathode Circulator Beam Linac Commissioning 01 02 03 04 05 06 07 08 09 10 11 12 SASE Undulator Installation

3. Linac commissioningandtests with the beam

5. Beam matching with the linac

7. Envelope matching

8. phase Energy Diagnostic Section Long. phase space QTriplet Towards undulators Linac RFD QTriplet Bunch length Projected emittance Slice emittance

9. Velocity bunching concept (RF Compressor) If the beam injected in a long accelerating structure at the crossing field phase and it is slightly slower than the phase velocity of the RF wave , it will slip back to phases where the field is accelerating, but at the same time it will be chirped and compressed. The key point is that compression and acceleration take place at the same time within the same linac section, actually the first section following the gun, that typically accelerates the beam, under these conditions, from a few MeV (> 4) up to 25-35 MeV.

10. phase 2.5 ps 90 MeV Energy 5 ps 132 MeV Q=250 pC phase Energy Preliminary results in Velocity Bunching regime

11. Summerproblems • Cathode QE disease probably due to water molecules contamination • Beam performances affected by temperature stabilization in the bunker and in the laser room • Gun RF circulator broken down

12. Cathode replacement

13. New QE map 3x3 mm, step 150 m QE = 4x10-5 Q=700pC with 18 J

14. Laser system upgrade • UV stretcher upgraded leading to higher available laser energy • Improved diagnostics, cross correlator motorize, streak camera and spectrometer installed • New optical tranfer line to the cathode • Laser room temperature and air flow stabilization

15. Undulators commissioning and FEL experiments

17. SASE FEL Self Amplified Spontaneous Emission

18. GENESIS simulation of the SPARC SASE-FEL @ 530 nm

19. Courtesy L. Giannessi (Perseo in 1D mode http://www.perseo.enea.it)

20. Slippage length independent processes ζ SASE Longitudinal coherence The radiation “slips” over the electrons for a distance Nurad

21. FEL experiments: single spike

25. FEL experiments: seeding

26. FEL Amplifier Laser-Seeded

27. SEEDING Courtesy L. Giannessi (Perseo in 1D mode http://www.perseo.enea.it)

28. Ti:Sa Regenerative amplifier 800 nm - 2.5 mJ – 1 kHz + High order harmonics 400 & 266 nm + High order armonics in gas: 266, 160, 114 nm High Energy Short duration Spatial and temporal Coherence

30. Beam experiments: laser comb

32. Laser Comb: a giant microbunch instability

33. THz source THz radiation can be easily produce by means of CTR It is difficult to put high charge in sub-ps bunches A laser comb structure in the longitudinal laser profile can solve this problem

37. Plasma wakefield acceleration

38. SPARC+PLASMON_X

39. Plasmon Thomson quadrupoles dipoles RF deflector collimator 25º solenoid Photoinjector RF sections 25º 11º FEL 5.4 m 1.5m 10.0 m 14.5 m 1-6 Undulator modules Diagnostic

40. The Frascati Laser for Acceleration and Multidisciplinary Experiments laser pulses: 50 fs, 800 nm >100 TW @10 Hz

41. LWFA acceleration of externally injected electrons in a gas-jet plasma

42. Tuneable X-ray radiation source based on Thomson Scattering

43. 2009 planning High Brightness - Velocity Bunching - Laser Comb 01 02 03 04 05 06 07 08 09 10 11 12 SASE - SEEDING - Single Spike

45. THE END