A 12 hour period of quiet running were the main goal was to produce a small spot.

2. A 12 hour period of quiet running were the main goal was to produce a small spot.

3. WS3 RF-BPMs KEK BSM

4. The FFTB BPMs can be used to project the beam jitter to WS3 for comparison with the beam sigma. As expected, the beam jitter to beam sigma ratio is 30%. The 1 Hz peak is a signature of beam jitter in the SLC due to beam motion feed- backs.

5. With their close spacing (5 cm) and high resolution (30 nm) the RF-BPMs can be used to measure the beam’s jitter emittance at the entrance to the Final Transformer. The jitter emittance at the RF-BPMs is about 1/10th of the beam emittance measured in sector 28. This is consistent with the 30% beam jitter to beam sigma ratio.

6. Inflection point Beam jitter at the IP can be measured by placing the beam at an inflection point on the KEK BSM fringe pattern. Each point is for 20 laser on pulses or 2 seconds of data. The error bars are a measurement of the beam’s rms motion during the 2 second period. The histogram of the above error bars shows beam jitter relative to the fringe pattern of 41 nm. This is about a factor of 2 larger then what is expected for the 30% beam jitter to beam sigma ratio.

9. KEK BSM table IP flange piezo electric supports The Final Transformer quadrupoles sit on piers or concrete blocks descending approximately 10 feet to a sandstone foundation. QC1 QX1 QC2 beam direction quadrupole table ground concrete block

13. A measurement showing * of 126 um. What is not completely understood is the 77 nm offset when  goes to 0. Although in previous runs the offset has be around 50 nm. At times the measured emittance in sector 28 can be almost a factor of 4 less then the original design emittance for the FFTB.