1. FC1 M AGNETIC M APPING V. Blackmore CM39 25 th June, 2014 01/13

2. List of measurements FC1 field map measurements Measured at several currents in flip and solenoid mode: Flip mode: 0A, 50A, 100A, 150A, 180A Solenoid mode: 0A, 3A, 50A, 75A, 100A, 114A, 120A Now for some extremely preliminary plots! Comparison to calculation Z positioning of mapper Forward/backward measurements Thoughts on how to logically continue… 02/13 See “Status of AFC Module” on Friday for more information

3. Comparison to calculation 03/13

4. Comparison to calculation ~0.8% 04/13

5. Comparison to calculation Ratio of measured to calculated field in Flip Mode at 150A Ratio of measured to calculated field in Solenoid Mode at 100A 05/13

6. Comparison to calculation Ratio of measured to calculated field in Flip Mode at 100A Ratio of measured to calculated field in Solenoid Mode at 100A y-axis not quite identical, unfortunately! 06/13

7. z-Positioning Accuracy Mapper has a given grid of points it measures over Mapper reports the z- position data is taken at Question: How reliable is the mappers longitudinal positioning? 07/13

8. z-Positioning Accuracy Runs ForwardBackwardForwardBackward 2—16-0.02670.00290.01080.0084 17—21-0.0463-0.03420.00990.0070 Mapper has a given grid of points it measures over Mapper reports the z- position data is taken at Question: How reliable is the mappers longitudinal positioning? 08/13

9. “Forward- Backward” correction 0.7mm correction applied to data files during SS mapping, accounts for belt tension Correction was not removed for FC mapping, different belt, different tension Therefore “backwards” measurements are reported at “the wrong z” Similar reported z, but different fields 1.Take “forward” measurements as “the truth” 2.Find the field gradient and intercept between adjacent “forward” points 3.Given that gradient and intercept, locate the “true” z of “backward” points 09/13

10. “Forward- Backward” correction 0.7mm correction applied to data files during SS mapping, accounts for belt tension Correction was not removed for FC mapping, different belt, different tension Therefore “backwards” measurements are reported at “the wrong z” 10/13

11. “Forward- Backward” correction 0.7mm correction applied to data files during SS mapping, accounts for belt tension Correction was not removed for FC mapping, different belt, different tension Over many runs... 11/13

12. “Forward- Backward” correction 0.7mm correction applied to data files during SS mapping, accounts for belt tension Correction was not removed for FC mapping, different belt, different tension Over many runs… Probe 00.37580.1467 10.34680.2235 20.31800.2484 30.62413.5956 40.46040.4251 50.40192.7874 12/13

13. Summary 13/13