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Status of the Simulations on Photo Injector Optimization for Low Charges

Status of the Simulations on Photo Injector Optimization for Low Charges. Yauhen Kot BD Meeting, 01.02.2010. Preliminary results work is not accomplished yet…. Optimization Code for the Photo Injector by M. Krasilnikov. FLASH Photo Injector. Booster phase is fixed.

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Status of the Simulations on Photo Injector Optimization for Low Charges

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  1. Status of the Simulations on Photo Injector Optimization for Low Charges Yauhen Kot BD Meeting, 01.02.2010

  2. Preliminary resultswork is not accomplished yet…

  3. Optimization Code for the Photo Injector by M. Krasilnikov

  4. FLASH Photo Injector Booster phase is fixed Same gradient at booster and ACC1 Gun Booster ACC1 3,9GHz

  5. Ez1(z=0)=45MV/m + Bucking coil peak field Optimization Code for FLASH Photo Injector

  6. FLASHgun_p12.dat efld.dat Field Files for the Gun Slightly different files but big consequencies

  7. Calculated with best parameters for efld.dat. Comparison efld FLASHgun_p12

  8. Tuning Parameters Field File efld.dat note: • Booster gradient and phase were considered as parameters to be optimized • Best value for booster gradient was found in the near of the desired 40.12MeV almost in all cases • Booster Phase seems not to affect the emittance significantly • Results after ~50 Iterations with Optimization Code with 2000 particles

  9. Results after Booster at s=9.0m Field File efld.dat note: - Run with 200000 particles with the best values from the optimization code

  10. 100pC, pulse length = 3,3ps 40pC, pulse length = 3,3 ps 20pC, pulse length = 3,3ps 100pC, pulse length = 4,4ps 40pC, pulse length = 4,4 ps 20pC, pulse length = 4,4ps Bunch Shape for 4.4ps and 3.3ps Optimization procedure was cut after 40-50 iterations  possibly not enough to find really best values

  11. Slice Energy Emittance and Slice Energy Spread for 4.4ps and 3.3ps

  12. Convergency: Slice Energy Spread and Slice Emittance Test with more particles but the same amount of cells Q=100pC Pulse Shape: Gaussian t=4.4ps Main parameters after booster at s=9.00m

  13. Sensitivity Test: Solenoid 100pC, 4.4ps Assume Isoll(optimum)=300.0A - The accuracy of 0.1A of the set point of the solenoid current Should be sufficient to control the emittance - But big difference in the optics functions…

  14. Sensitivity Test: Bucking Coil 100pC, 4.4ps Assume Isoll(optimum)=16.0A

  15. Solenoid Test: Bunch Shape Still to clear up: if the emittance increase at higher solenoid field occurs only due to the tails of the bunch…

  16. Bucking Coil Test: Bunch Shape

  17. Summary • Many open questions yet…

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