RHIC Electron Cooling Group

Collaboration Workshop on RHIC electron cooling and high-brightness electron beams, May 24-26, 2006, Brookhaven National Laboratory

Charge:

1. Establish the degree of confidence and accuracy we have in the simulations and theory of non-magnetized electron cooling. Examine the performance of this cooling technique for RHIC and evaluate potential difficulties. Establish a plan for continues R&D.

2. Establish the degree of confidence and accuracy we have in the simulations and theory of the generation of high-charge, low emittance bunches from a superconducting photoinjector. Examine the techniques of laser pulse shaping and their effect on emittance. Establish a plan for continued R&D.

Detailed Charge - Electron Cooling Working Group

1. Are there uncertainties about description of the friction force?

     1.a) without wigglers

     1.b) with wigglers

2. How good is comparison between theory with experimental measurements?

3. What additional experimental measurements should be done?

4. What additional simulation studies should be done?

5. How good is our prediction of luminosity based on non-Gaussian distribution?

6. What improvements are needed to our models?

7. How accurate is our description of recombination loss?

8. Do we need a wiggler to suppress recombination?

9. Do we need additional focusing in cooling section?

10. What are requirements on wiggler parameters?

11. What are requirements on wiggler errors?

12. What are the requirements on beam alignment and diagnostic accuracy?

13. What instrumentation will be needed?

14. How accurate are our estimates of stability thresholds?

15. What else need to be done on stability issues?

16. What are the dilution effects in the electron beam and what is their significance?

17. Develop R&D plan.

Detailed Charge - SRF Photoinjector Working Group

1. What is the current simulated best performance for emittance vs. charge?

2. What are the uncertainties in the simulation of emittance of the electron beam?

3. How good is the comparison between simulation and experimental measurements?

4. What experimental measurements should be done?

5. What improvements are needed in the simulation codes?

6. What is the performance expected of the SRF gun and at what level of confidence?

7. What improvements can be expected in the beam brightness?

8. What are the laser issues for the photocathode?

     8.a) Assuming CsK2Sb type cathode

     8.b) Assuming diamond amplified cathode

9. What laser development work is needed?

10. What are the current capabilities of laser pulse shaping?

11. What are the prospects of arbitrary transverse - longitudinal laser pulse shaping?

12. What are the necessary developments in laser shaping?

13. What instrumentation will be needed?

14. What needs to be done on instrumentation?

15. What do we know about halo generation?

16. What needs to be done in the halo area?

17. Develop an R&D plan.

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