1. K. Fuchsberger 2009-06-29 1

2.  Kick response measurements  Dispersion measurement 2009-06-29 2

3. Vertical error increasing (phase) H response (MCIAH.80204) V response (MCIAV.80104)

4. 2009-06-29 4 Kick-response measurements H: Dp/p dep. Only partly reproduced by model V: Phase error for Dp/p=0, but almost no Dp/p dep. of measured data. (Data: 2008-09-05)

5. 2009-06-29 5 Kick-response measurements H: V: (Data: 2008-09-05)

6. FT-length (s)b2b3deltak/kdeltap/pdeltarms 0.252.64-4.790.0029-0.00211.94 +- 0.33 0.52.55-4.610.0029-0.00202.00 +- 0.30 22.57-4.650.0030-0.00211.99 +- 0.34 average2.59-4.680.0029-0.0021 stddev0.040.090.00010.0000 b3 is independent on FT length (average = -4.68) b2, deltak/k, deltap/p unrealistic, but related by transformation. (Data: 2009-06-07) Fits to Kick-response data: 2009-06-29 6

7. (Data: 2009-06-07) 2009-06-29 7

8. BPM scaling polynomials applied additional factor of 1/1.12 applied (after polynomials) 2 nd order Dispersion higher than predicted by model! (Data: 2009-06-07) 2009-06-29 8

9. 9 (Data: 2009-06-07)

10. BPM scaling polynomials applied additional factor of 1/1.12 applied (after polynomials) !? (Data: 2009-06-07) 2009-06-29 10

11. Results from fit: 1. Calc parameters from Kick- Response 2. With resulting values fit xi and Dp/p to Dispersion. 3. Fit Kick-Response with fixed Dp/p 4. Go to 2. 2009-06-29 11 (Data: 2009-06-07)

12. Preliminary Conclusions:  A model including b 3 (between about -4 and -5 units) reproduces very well both the measured dispersion- and kick-response- data.  The effect is independent on the flat-top length. Questions:  What is a realistic (measured) average value for a b 3 the MBIs used in TI8?  What else could be the source of the observed effects? 2009-06-29 12

13. 2009-06-29 13

14. 2009-06-29 14 (Data: 2009-06-07)

15. 2009-06-29 15 (Data: 2009-06-07) !?

16. 2009-06-29 16 with Relation to madx strengths: