User name Seonho Choi
Log entry time 10:09:22 on June28,2001
Entry number 64886
keyword=Beam Energy StabilityWith fast feedback and energy lock problems, I checked energy stability using IPM1C12 beam position. In ideal case, this position should remain to zero. But as the following plot shows it jumps up and down with time. Here we are talking a dispersion over 4 meters. So 1mm dispersion means 2.5 * 10**-4,or at the energy of 2.7 GeV, it means energy change of 1.4 MeV. For this experiment, it shouldn't be critical.
FIGURE 1
