1 / 12

ASTRA Injector Setup 2012

ASTRA Injector Setup 2012. Julian McKenzie 17/02/2012. Baseline:. Simulations using ASTRA (07/04/2008 win32) No intrinsic emittance – could expect up to 1.2 mm mrad from photocathode. 7 ps Gaussian vs 28 ps flat-top. Buncher power scans. Red = 7 ps Gaussian

presta
Download Presentation

ASTRA Injector Setup 2012

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. ASTRA Injector Setup 2012 Julian McKenzie 17/02/2012

  2. Baseline: Simulations using ASTRA (07/04/2008 win32) No intrinsic emittance – could expect up to 1.2 mm mrad from photocathode

  3. 7 ps Gaussian vs28 ps flat-top

  4. Buncher power scans Red = 7 ps Gaussian Blue = 28 ps flat-top • Bunch length required at entrance to linac to achieve energy spread for FEL ~7ps • We still don’t understand booster to linac longitudinal dynamics... Buncher power [W] Yuri reckons 1.6 mm FWHM

  5. BC1 scans For 7 ps Gaussian laser pulse Red = 1 kW buncher power Green = 1.6 kW buncher power

  6. For 1kW buncher power, choose +15 BC1 phase • Set SOL-02 to minimise transverse beam size • Set BC2 phase to minimise chirp (-13)

  7. But phase space isn’t good: Is RMS bunch length even a good quantity to optimise on?Need to look at phase space plots

  8. Phase space plots (longitudinal) Using “nominal” setup detailed on slide 1 Red = 7 ps Gaussian Blue = 28 ps flat-top -10/+10(as per original model) -20/+30 Looks similar to Bruno’s: Lots of charge at the “crossover point” NB// head to the right. z [m] vspz (eV/c)

  9. BC1 phase for minimum curvature: For 7 ps Gaussian laser pulse BC1 = 0 BC1 = -6 Buncher = 1 kW Buncher = 1.6 kW

  10. Sol2 scans For 7 ps Gaussian laser pulse Red = 1 kW buncher power Green = 1.6 kW buncher power

  11. BC2 phase? For 7 ps Gaussian laser pulse Red = 1 kW buncher power Green = 1.6 kW buncher power BC1 at -6 SOL-02 at 220G

  12. To do list: • Emittance vs SOL-02 for 7/28ps with identical bunch length from buncher • At minimum emittance from above, BC2 phase scan to look at minimum energy spread • Investigate lowering energy gain from BC1 • Anything else?

More Related