Neutralized compression and focusing of an intense ion beam for target heating experiments

1. Neutralized compression and focusing of an intense ion beam for target heating experiments

3. Neutralized compression and focusing experiment objectives Demonstrate capabilities for WDM experiments Control beam envelope Demonstrate effective neutralization of the beam space-charge Control velocity tilt on beam Effects of net defocusing Effects of field imperfections Understand limitations on minimal spot size Emittance Aberrations Effectively measure longitudinal phase space and temperature

4. Warm Dense Matter Target Experiments

5. Neutralizing the space charge provides the ability to focus K+ ion beams to a smaller spot

6. 3D parallel Lsp particle-in-cell (PIC) code using a fully kinetic energy-conserving algorithm. (Large Scale Plasmas) T. P. Hughes, S. S. Yu, and R. E. Clark, Physics Review ST-AB 2, 110401 (1999); D. R. Welch, D. V. Rose, B. V. Oliver, and R. E. Clark, Nuclear Instruments & Methods in Physics Research A 464, 134 (2001). Lsp is a software product of Mission Research Corporation, Albuquerque, NM (). 3D parallel Lsp particle-in-cell (PIC) code using a fully kinetic energy-conserving algorithm. (Large Scale Plasmas) T. P. Hughes, S. S. Yu, and R. E. Clark, Physics Review ST-AB 2, 110401 (1999); D. R. Welch, D. V. Rose, B. V. Oliver, and R. E. Clark, Nuclear Instruments & Methods in Physics Research A 464, 134 (2001). Lsp is a software product of Mission Research Corporation, Albuquerque, NM ().

8. Two different plasma sources used to neutralize the beam space charge

11. Scans in energy demonstrate tuning the beam to axial focus

14. Phototube (PT) and fast Faraday cup (FFC) measurements complement each other well

15. Spread in axial compression is due to velocity tilt jitter

16. Fourth solenoid tweaked to optimize simultaneous focus

17. Time scans demonstrate simultaneous focus

19. Conclusions Demonstrate capabilities for WDM experiments Control beam envelope v Demonstrate effective neutralization of the beam space-charge v Control velocity tilt on beam Effects of net defocusing v Effects of field imperfections v Understand limitations on minimal spot size Emittance v Aberrations v Effectively measure longitudinal phase space and temperature

20. End

21. Extras

22. Electrostatic energy analyzer provides measurements of 2-D longitudinal phase space and temperature

23. Advantages of using ions Uniform heating and energy deposition of large volumes. No shocks, No x-ray or e- preheat. tLTE << tpulse << thydro. Strategy: Operating at the Bragg Peak

24. A new bunching module will increase the voltage amplitude and voltage ramp duration Gap geometry is flexible; opportunity to optimize. core is driven by a thyratron-switched modulator. Because the modulator for each core can be designed to produce different waveforms and can be triggered independently, a variety of waveforms can be produced at the acceleration gap using the 14 discrete building blocks. core is driven by a thyratron-switched modulator. Because the modulator for each core can be designed to produce different waveforms and can be triggered independently, a variety of waveforms can be produced at the acceleration gap using the 14 discrete building blocks.

25. 4-Solenoid Transport, NDCX tune, Induction Bunching Module, and neutralization column

26. For WDM experiments, simultaneous longitudinal compression and transverse focusing must be demonstrated Space charge couples transverse & longitudinal dimensionsSpace charge couples transverse & longitudinal dimensions

28. Phototube (PT) demonstrates method of neutralization is not critical for axial focus

29. Time scans demonstrate simultaneous focus