1. Turn-By-Turn Emittance Tracking in CesrTA with Space Charge
-ctf_12wig_v4c_s2 lattice, 2.0 GeV
-Modified beambeam jobs with space charge module incorporated
-All scans run at 1000 particles for 100,000 turns, unless otherwise stated
-Last week: scans included the tune shift resulting from space charge effects
-Now: “masking” this tune shift, to have a direct comparison of one run to the next
With tune shift (last week)
Without tune shift (this week)

2. Effects of Space Charge on Vertical Emittance
-Summarizing the plot on the previous page, vertical emittance after 100,000
turns was plotted against current
-At 100,000 turns, currents under ~4mA have not finished damping, therefore
those data points are nonphysical
-Trend: space charge contribution to vertical emittance at proposed CesrTA
operating current (1.25mA) will be negligible
y = 5pm

3. Space Charge At CesrTA Operating Current (1.25mA)
-As previously noted, vertical emittance has not fully damped after 100,000 turns
-An additional tracking was done for 1000 particles out to 1E6 turns
-y damps down to ~1E-12m
-Vertical emittance damps down to roughly 1E-26 m
-Conclusion: effects of space charge on vertical emittance is negligible at CesrTA
operating levels