Status of the Thomson Source On behalf of the PlasmonX Group

Outline Electron Beam: Laser Beam for Thomson Source: Parameter List and Transfer Lines layout Laser Beam for Thomson Source: Main Parameters and Transport Overview Procurement Update Basic Schedule

Electron Beam Parameter list Value Bunch charge [nC] 1-2 Energy [MeV] 28-150 Length [ps] 15-20 εn_x,y [mm-mrad] 1-5 Energy spread [%] 0.05*-0.2 Spot size at interaction point rms [µm] 5-10 *using X-band structure at gun exit

Electron Beam TL Schematic layout

Technical design A. Zolla

SPARC hall Optical transfer line 0.3 PW LASER SEEDING LASER PHOTOINJ PLASMON.X THOMSON HHG DGL PHOTOINJECTOR UNDULATOR

Laser transport overview C. Vicario, D. Filippetto

Laser parameters delivered to Thomson experiment Pulse energy 6 J Spot top hat, diameter 9 cm and aperture 13.5 cm M2 = 1.5 Pulse length 6 ps Max bandwidth 80 nm, central wavelength range 800 nm

Transport system: considerations Long transport (< 30 m) from the compressor to the interaction chamber. To maximize the beam stability an achromatic relay optical system and a ultrastale mount are foreseen. To avoid absorption and distortion effects pipeline will be kept in low vacuum (10^-3 mbar) upgradeable at 10^-6 mabar for future full compressed beam transport. Delay line for temporal overlap between laser pulse and electron beam. High energy large aperture optics: mirrors, filters, beam samplers, achromats lenses.

Simulated waist vs focal and wavelength Vacuum port Flat mirror Simulations with Zemax optical design code Extraction Interaction Off axis parabola C. Vicario

Optical layout and simulation Vacuum port plane mirror plane mirror hole OAP Spot size at the interaction point

Transverse beam envelopes at 28 MeV (Parmela simulation)

Thomson Interaction Region Interaction point Large solenoid Laser in Beam dump

Thomson Interaction Region F. Bosi

A. Bacci

OUT (H2O) IN (H2O) IN current D. Giove

Iron excitation and Deflection at max energy (150 MeV) G. Gatti

℮- TL up to the two IP’s ( 1.2 M€ ) 6 Dipole Magnets + PS 20 Quadrupole Magnets + PS 18 Steering Magnets + PS Strong Focusing Solenoid +PS Electron beam dumper + PS Girders Diagnostic Controls Vacuum……..

Up to now: 6 Dipole Magnets + PS 20 Quadrupole Magnets Giunta INFN Marzo 2009 = 480 k€ (SPARC) 6 Dipole Magnets + PS 20 Quadrupole Magnets Strong Focusing Solenoid (NTA-Mi funds 2009) Electron beam dumper (NTA-Mi funds 2009) 20 Quad PS 18 Steering Magnets + PS Girders Diagnostic Controls Vacuum Almost by the end of 2009 (SPARC)

In detail: NTA-LNF 2008: NTA-LNF 2009 = 123 k€: 1 Off axis Parabolic Mirror + 5 Silica Mirrors +1 Diode Laser → 47 k€ NTA-LNF 2009 = 123 k€: linea di trasporto (30m) del fascio laser Flame nella sala sperimantale SPARC lenti di focalizzazione   viewport da vuoto   specchi  telecamere e fotodiodi tavolo ottico   computer per controlli apparecchiature movimentazioni micrometriche attenuatori,filtri,beam splitters materiale di consumo

Basic Schedule Procurement & Installation by Spring 2010 Commissioning as follow-up Both in time sharing with SPARC operation Laser Installation: end 2009 Laser Commissioning: end 2010