Preliminary RF and Beam Data Analysis Jeff Dooling June 26, 2007.

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Presentation transcript:

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