From Xfel-beam/talks 2012.05.07: Analysis of bunch compression studies (PDF) “11 LOLA Mystery”

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Presentation transcript:

from Xfel-beam/talks : Analysis of bunch compression studies (PDF) “11 LOLA Mystery”

11 LOLA Mystery f.i. measurements 61&62 zero-crossing #1zero-crossing #2, flipped 15.4 fsec per pixel really the same Lola settings? time index P1 P2 P3 P4 A1 A2 A3 A measurement time calibration ??? new LOLA amplitude time calibration ??? old LOLA amplitude measurement rf settings (phases/deg, amplitudes/MV) perhaps not, but there is more …

57&58 time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel rf settings (phases/deg, amplitudes/MV) no calibration between measurements !!!

and measuerements 1..9

1+&1- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel saturated ??

2+&2- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement time calibration measurement fsec per pixel saturated ??

3+&3- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel saturated ??

4+&4- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel saturated ??

5+&5- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel saturated ??

6+&6- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel

7+& fsec per pixel

8+&8- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel

9+&9- time index P1 P2 P3 P4 A1 A2 A3 A4 index measurement measurement fsec per pixel

11 LOLA Mystery “energy” axis “time” axis desired effect focusing does not change with sign of streak uncorrelated hor/vert/long should produce the same picture is there correlation ??? Lola imaging matrix for 15.4 fsec/pixel: “smearing” on “energy” axis?:

if there is no hl to y correlation same smearing !

from Xfel-beam/talks : Simulated LOLA Measurements (PDF) “Simulated LOLA Measurements”

LOLA setup LOLA L = m ; GHz Drift L = m Bend L = m ;  5 deg Drift L = m Bend L = m ;  5 deg Drift L = m OTR 17.5 µm / pixel

simulated LOLA measurement: gaussian transverse shape so far no difference for vz=+-1 black = long. phase space color = LOLA simulation

simulated LOLA measurement, no emittance but coupler kick only time dependent part of CK transverse due to CKhor.+vert. CKvert. CKhor. CK black = long. phase space blue = LOLA simulation phi = 8.0 deg