K. Fuchsberger 2009-06-29 1.  Kick response measurements  Dispersion measurement 2009-06-29 2.

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Presentation transcript:

K. Fuchsberger

 Kick response measurements  Dispersion measurement

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

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: )

Kick-response measurements H: V: (Data: )

FT-length (s)b2b3deltak/kdeltap/pdeltarms average stddev b3 is independent on FT length (average = -4.68) b2, deltak/k, deltap/p unrealistic, but related by transformation. (Data: ) Fits to Kick-response data:

(Data: )

BPM scaling polynomials applied additional factor of 1/1.12 applied (after polynomials) 2 nd order Dispersion higher than predicted by model! (Data: )

9 (Data: )

BPM scaling polynomials applied additional factor of 1/1.12 applied (after polynomials) !? (Data: )

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 (Data: )

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?

(Data: )

(Data: ) !?

with Relation to madx strengths: