1. A 500 MeV S-band Low Cost Electron Beam Source for ILC Keep Alive Source Goal: 500 + MeV, 3 nC, ~ 1 mm on ILC Ti Target Wei Gai, ANL

2. Injector/Pre-accelerator SLC 3 M Structure, up to 68 MeV/40 MW APS Micro-wave photocathode gun (4 MeV ) Modulator (100 MW, 5  s) 10 Hz TH2128C Klystron 50 MW, 5  s SLED, output 85 MW, 2  s 5 MW 40 MW SLC 3 M Structure, up to 68 MeV/40 MW Energy Filter Magnet* Output energy Depends on input RF Power. 40% overhead build in.

3. SLAC 3 M Structure, up to 68 MeV/40 MW Modulator (100 MW, 5  s) 10 Hz TH2128C Klystron 50 MW, 5  s SLED, output 85 MW, 2  s 40 MW SLAC 3 M Structure, up to 68 MeV/40 MW SLAC 3 M Structure, up to 68 MeV/40 MW Modulator (100 MW, 5  s) 10 Hz TH2128C Klystron 50 MW, 5  s SLED, output 85 MW, 2  s 40 MW SLAC 3 M Structure, up to 68 MeV/40 MW 100 MeV + from injector 250 + MeV375 + MeV 500 MeV +

4. Cost (all commercial components) 8 Linac tanks, $800 K (from IHEP, China) 4 SLC SLED, $70x4 K (IHEP) APS style RF gun, $100 K (Many places). Modulator, $300x4 K (Home build, based on L-band cost at ANL, including constant charging supplies). Klystron, $250x4 K (From Thales, accurate quote from the company). Waveguide components (phase shifters, splitters, $60x4 K). Laser: $ 200 K M&S: controls, power supplies and so on, $200x4 K Total: Contingency: $600 K Total $5220 K Final cost maybe a little higher due to frequency of 2.6 GHz (nominal slac 2.856 GHz).