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Laser Based Polarized e + Source for ILC

Laser Based Polarized e + Source for ILC. Tsunehiko OMORI (KEK). 1st ILCWS@KEK 13-15/Nov/2004. Why laser based?. Source and full energy/intensity beam remains independent. Electron and positron systems remain independent. We assume that the first phase will

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Laser Based Polarized e + Source for ILC

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  1. Laser Based Polarized e+ Source for ILC Tsunehiko OMORI (KEK) 1st ILCWS@KEK 13-15/Nov/2004

  2. Why laser based? Source and full energy/intensity beam remains independent. Electron and positron systems remain independent. We assume that the first phase will be conventional positron source.

  3. We have a conceptual design for a warm LC. ~ 100 bunches in ~ 300 nsec, bunch to bunch : ~2.8 nsec, 1.2x1010 positrons/bunch, pol. ~ 54%.

  4. conceptual design

  5. 10 collision sections in total T. Omori et al., NIM A500 (2003) 232-252

  6. multi-bunch pulse CO2 laser

  7. Is this applicable to a cold LC? Yes ! With a small modification. 150 Hz -> interleaved 300 Hz operation

  8. Entire Timing Structure cluster of trains 300 Hz 28 trains cluster of trains 300 Hz 28 trains cluster of trains 300 Hz 28 trains ON 100 ms 100 ms 100 ms 100 ms 100 ms 100 ms OFF A Cluster of Trains train train . . . . . 3. 3 ms a cluster = 28 trains a train = 100 bunches a cluster = 2800 bunches

  9. This fits a 3 km DR, pre DR C = ~few 100 m DR C = ~3 km (and ~17km) few trains a cluster = 28 trains and, fits a 17 km DR too. In any case, this require very fast kicker.

  10. Do we have another scheme ? Yes ! With FELs. With using FELs, we can provide a positron beam of any time-structure.

  11. by S. Hiramatsu

  12. (1) FEL scheme fits both, (a) interleaved 300 Hz operation, and (b) 5 Hz operation. (2) 300 Hz operation fits both 3 km DR and 17 km DR. (3) 5 Hz operation fits 17 km DR. a train = 2800 bunches. bunch to bunch = ~ 300 or 20nsec. 300 nsce --> Both 5.8 GeV and 1.6 GeV linacs -> can be cold linac -> 1.6 GeV FEL linac may be ERL.

  13. Summary Laser based polarized positron production can be applicable to a cold LC. We have two choices. 1) Pulse CO2 laser: --> interleaved 300 hz operation. bunch-to-bunch: 2.8 nsec (very fast kicker) Fits both 3 km DR, and 17 km DR. 2) FEL: --> any time structure. bunch-to-bunch : 300, 20 , and 2.8 nsec DR: 3 km and 17 km if b-to-b = 300 nsec -> super linacs for e+ source

  14. Slides to Use Answering Questions

  15. e- beam laser beam Head-on collision a pair of parabolic mirror

  16. a collision section

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