 DOCUMENT METADATASLAC Technical Note: SLAC-TN-10-049
SLAC Release Date: November 24, 2010
QM02 Strength Measurement
Welch, J.
In late April, Paul Emma reported that his orbit fitting program could find a reasonably good fit only if the strength of QM02 was changed from design value of -5.83 kG to -6.25 kG a strength change of 7.3%. In late May, we made a focal length measurement of QM02 by turning off all focussing optics between YC07 and BPMS1 (in the spectrometer line) except for QM02 and adjusted the strength of QM02 so that vertical kicks by YC07 did not produce any displacements at BPMS1 (see Figure 1). The resul... Show Full Abstract
In late April, Paul Emma reported that his orbit fitting program could find a reasonably good fit only if the strength of QM02 was changed from design value of -5.83 kG to -6.25 kG a strength change of 7.3%. In late May, we made a focal length measurement of QM02 by turning off all focussing optics between YC07 and BPMS1 (in the spectrometer line) except for QM02 and adjusted the strength of QM02 so that vertical kicks by YC07 did not produce any displacements at BPMS1 (see Figure 1). The result was quoted in the LCLS elog was that QM02 appeared to 6% too weak, and approximately agreed with Pauls observation. Show Partial Abstract
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