1. Long Range (Advanced) Accelerator R&D User Facility Vitaly Yakimenko ATF/BNL

2. User facility or Lab project Different mentality – Time to study problem and not to concentrate on a solution – Support Vs. Research scientists – Staff retention – Well defined project schedule VS. long timeline It is difficult if not impossible to predict beneficiary of the research, yet HEP is paying for it Students: – excellent opportunities to train students – will make mistakes, facility will be scrutinized more when students are involved – trained students more likely work outside of HEP Planning how to preserve facility during difficult budget time is important

3. Inverse Free Electron Laser Proposed by R. Palmer – J. Appl. Phys. 43, 3014-23 (1972). Tested at ATF as acc elerator. – PRL 77, 2690 (1996) Used as key element in ATF experiments: – Microbunching: PRL 80, 4418 (1998) – STELLA, PRL 86, 4041 (2001) – HGHG, Science, 289 (2000) 932, PRL 86, 5902 (2001) – STELLA II, PRL 92, 54801 (2004) – PASER, PRL 97, 134801 (2006) … IFEL is key element to: – Preserve emittance during compression at LCLS – High Gain Harmonic Generation – Optical stochastic cooling – Short X ray beams at ALS IFEL is a typical example of continued surprises of applicability of Advanced Accelerator R&D.

5. Competition is an interaction, in which the fitness of one is lowered by the presence of another.

6. Commensalism is a class of relationship where one organism benefits but the other is unaffected. Remora sharks: Remora sharks are endowed with an adhesive disk on the dorsal surface of their heads. They use this adhesive disk to “hitch a ride” on larger animals, usually whales, which tend to be sloppy eaters. When food floats away from the whale’s mouth, the remora can unhitch itself and collect the scraps of food floating by.

7. Mutualism is an interaction between two organisms, where each individual derives a fitness benefit.

8. Cons: Difficult to explain value of unfocused program support long term goals review/manage small scale/budget user facility with very diverse program manage in the National laboratory ever changing environment/ protection/ documentation: (ATF has more complex laser interlock system then the rest of BNL). Pros: Diversity helps to experimental -- to deliver results/ publications/ PhDs on a regular basis. disciplinary, agencies and geographical -- with motivation and to survive difficult times Flexibility of the program and portfolio of expertise. Well being of the user facility depends on the user community. Natural mutual support is exiting to see and easy to support.