Part II complementing Mauros talk Erk Plasma Wakefield

Part II, complementing Mauro’s talk Erk • • • Plasma Wakefield Acceleration Advances in High Power Lasers Beam manipulations LACARA – recent result Chris Nantista’s “Comb” structure Plenary talks are here: http: //aac 08. lbl. gov/sessions/Monday. Plenary. html http: //aac 08. lbl. gov/sessions/Tue-Thu. Plenaries. html Hopefully the WG talks will follow soon!

Plasma Wakefield Acceleration • 2 schemes: Beam driven & Laser Driven • Both claim high gradients and high efficiency • Today comparison: – Peak power cheaper with lasers: $100 k for a T 3 laser vs. $5 M for even a 50 Me. V beam facility – Average power cheaper with beams: $104/Watt for lasers currently x 200 MW ~ $20 T driver – $10/Watt for CLIC-type RF x 100 MW blow-out (bubble) regime drive focusing Ramped Driver w/ Gaussian Load drive Claims: • η>75% beam loading efficiency • 1% energy spread

FACET proposal @ SLAC

Positron acceleration? – difficult!

Plasma Wakefield: Beam loading From Mori’s talk: This (simple) model leads to the claims of low energy spread and high efficiency.

High Power Lasers From Barty’s talk – “Think big!” LIFE: Laser-based Inertial Fusion Energy

Commercially available SM Fibre Lasers: http: //www. photonicsonline. com/product. mvc/YLR-3000 -SM-Ytterbium-Fiber-Laser-0002

Beam manipulations: Creating “drive” and “probe” beams:

Creating beam with fine temporal structure

Ramped bunch creation with T 566

LACARA • • Jay Hirshfield announcement: LACARA: Laser Cyclotron Resonance Accelerator Experiment at ATF (BNL) Principle: – cyclotron resonance at 5 T, Doppler-shifted to CO 2 laser f – coherent interaction. • 5 Me. V energy gain predicted with 800 GW. • Measured: 2 Me. V energy gain

Chris Nantista’s “Zipper Structure” Idea: – power flow outside of beam pipe – 90° phase advance but “standing wave” power flow 90° beam axis 90° out of phase

Capitola by the Sea