1. I. Syratchev F D, GHza, mmb, mmR/Q, k  /m  M, % QMQM E S /E A K T, V/pC/m/m  D, % QDQD  D, deg 34.48333.12335.086312.8621.1724.5922.81135.6219.544.296138. 32.98404.0095.7487.70133.475.0553.4751.96235.1494.828132 31.48486.2077.6042.43457.3436.3924.822.98263.1777.514126 a, mm F D, GHz L 6, m Length, m L 6 +L 8 L8L8 #1 #2 Dipole mode frequencies v.s. structure aperture Structure parameters. Bunches follow 0 –crossing at frequencies: 2.99855  11.5/11.0/10.5 ) L8L8 L6L6 PETS composed of two pieces of 6.25 mm and 8 mm structures. The overall length for 100 MW RF power production with respect to L 6 length is shown Possible configurations: #1. L 6 =L 8. Total length L = 1.0 m #2. L 6 /L 8 = (K 8 /K 6 ) 0.5 L = 0.42 6 +0.61 8 = 1.03 m #3. Max Es(L 6 ) = Max Es(L 8 ) L=0.61 6 + 0.33 8 = 0.94 m #4 Max Es(L 6 ) = 150 MV/ m L = 0.72 6 +0.17 8 = 0.89 m #5 Only L 8 L = 1.37 8 m Notes: Max Es(L 8 ) = 132 MV/m Form-factor 2 = 0.8 Extr. Efficiency = 0.95 Current = 5 A #3

2. I. Syratchev #1 #2 0.20 0.25 0.55 0.50 0.91 12.41 8.02 6.25 PETS possible configurations #1 #2 34.5 GHz 33.0 GHz 31.5 GHz Length, m Power, MW Length, m Es, MV/m

3. I. Syratchev Inter-structure connection Dipole mode couplers Dipole mode power flow. Rejection/Reflection ~ -20 db. beam Decelerating mode power flow Horizontal polarization Vertical polarization Dipole mode couplers should be used as BPMs