A large difference for two working points LOLA Measurements at FLASH Igor Zagorodnov S2E Meeting DESY 16. March 2015.

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Presentation transcript:

A large difference for two working points LOLA Measurements at FLASH Igor Zagorodnov S2E Meeting DESY 16. March 2015

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 2 Case :47 (M. Vogt) res1=75 fs sig1=125 fs ampl=1.21 (phase1=-118 )

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 3 Case :55 (M. Vogt) res2=35 fs sig2=45 fs ampl= 1.21 (phase2 =76.5)

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 4 Case :55 (M. Vogt) sig=sqrt(0.5*(sig1**2-res1**2+sig2**2-res2**2)) (reference?) sig=73.48 res2=35 fs sig2=45 fs ampl= 1.21 (phase2 =76.5) res1=75 fs sig1=125 fs ampl=1.21 (phase1=-118 )

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 5 Case :55 (M. Vogt) ?

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 6 Case :56 (I. Zagorodnov) res1=55 fs sig1=55 fs (phase1=72.7 )

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 7 Case :05 (I. Zagorodnov) res2=59.2 fs sig2=118 fs (phase2= )

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 8 Case :05 (I. Zagorodnov)

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 9 Why it takes a lot of time? The changing of the phase manually gives a large loses in the undulator section. With large voltage (1.2) it takes some time to find another phase. Conventional procedure to change the working point 1.To reduce the voltage to 0 2.Change the phase 3.Increase the voltage again. 4.New calibration. It takes not less than 10 minutes.

Igor Zagorodnov| S2E Meeting| 16. March 2015 | Seite 10 How can we do it faster? (C. Behrens) 1.For the same amplitude the resolutions has to be the same. The difference comes solely due to different calibration and jitter in the unstreaked beam size. 2.Switching phase does only need seconds. If somebody woud measure the response (real phase vs set phase) a simple script could be written to make this happen.