1. June 14, 2007Pauli Kehayias1 Fast Ion Instability in CesrTA/ILC -Project extent –To study simulations of fast ion instability with CesrTA in mind -Progress –Simple simulation of bunched uniform cylindrical beam/ion interaction

2. June 14, 2007Pauli Kehayias2 c F Electron bunches Ion -Assumptions –Start ion from rest at some amplitude –Uniform cylindrical bunches –Step function radial force (r for r < r b, 1/r for r < r b ) –No bunch acceleration -Calculation –Time for the ion to reach r = 0 from rest  frequency rbrb r

3. June 14, 2007Pauli Kehayias3 Beam radius: 2 mm Beam current: 100 mA Beam energy: 2 GeV Bunch length: 1 cm Ion: CO +

4. June 14, 2007Pauli Kehayias4 Beam radius: 2 mm Beam current: 100 mA Beam energy: 2 GeV Bunch length: 1 cm Ion: H +