Preliminary RF and Beam Data Analysis Jeff Dooling June 26, 2007
Summary of rf and beam data ISIS IPNS
ISIS RF Data 2 cavities —courtesy I. Gardner (Nov 2006)
ISIS SH rf and near injection (2 cavities)
SH RF status September 2005 (no SH RF) Injected charge: 2.33x10 13 protons Captured charge: 2.07x10 13 protons Extracted charge: 2.04x10 13 protons Dec 2006 (SH rf Superperiods 4 and 5) Injected charge: 2.78x10 13 protons Captured charge: 2.54x10 13 protons Extracted charge: 2.47x10 13 protons
FFT analysis of ISIS single-ended BPM data (shortly injection)—fundamental RF only f o = MHz
FFT analysis of ISIS single-ended BPM data (near extraction)—fund. RF only f o = MHz
Results Capture efficiency improved substantially Total current to extraction up by 10% Would like to look at pulse shape evolution Are possible instabilities an issue later
IPNS RCS data Ferrite limits use to the first 4 ms Use always provides an improvement in current Other stability issues in the machine?
RCS RF data
Preliminary look at bunch shape with phase
Simple waveform analysis
Vertical instability later Unstable bunches are shortened
Prelimary IPNS results Good response with SH angle Voltage ratio approximately 0.55 Bigger fish to fry—instability