Pilot's Flight Oper. Instructions by Army Mdl AT-19, British Mdl Reliant [T.O. 01-50KA-1]

By Army Mdl AT-19, British Mdl Reliant [T.O. 01-50KA-1]

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One reason: the event rate for coincidence experiments was limited by the best duty factor available from medium energy electron accelerators to only ~1%. • Recommends the next generation of electron accelerators to be capable of carrying out coincidence experiments: both the scattered electron and the associated ejected particle are detected. S. Nuclear Science Advisory Committee (Barnes et al. 1982). This committee recommends the construction of at least one cw electron accelerator with maximum energy of 4 GeV.

USPAS Recirculated and Energy Recovered Linacs Thomas Jefferson National Accelerator Facility Operated by the Southeastern Universities Research Association for the U. S. Department of Energy 17 February 2005 Invariant Emittance . The “invariant” or “normalized” emittance is defined to be ε n = βγε where now . β = vz / c γ= 1 1− β 2 = Ebeam mc 2 It does not change as beam is accelerated. Pf: Conservation of momentum d ( γ mv ) = − e [E + v × B ] dt d ( γ mv x ) = 0 dt γ mc β x ( after) = γ mc β x ( before) γβ z x ' ( after) = γβ z x ' ( before) USPAS Recirculated and Energy Recovered Linacs Thomas Jefferson National Accelerator Facility Operated by the Southeastern Universities Research Association for the U.

S. Department of Energy 24 February 2005 SRF Recirculated Linacs for Nuclear Physics (cont’d) ƒ For cw operation, power dissipated in the walls of a Cu structure is substantial. 5 56000 !!! 54 112 Furthermore, the RF power to beam power efficiency is much higher in SC accelerators. USPAS Recirculated and Energy Recovered Linacs Thomas Jefferson National Accelerator Facility Operated by the Southeastern Universities Research Association for the U. S. Department of Energy 24 February 2005 SRF Recirculated Linacs for Nuclear Physics (cont’d) ƒ For applications demanding high cw voltage, SC cavities have a clear advantage: • Recall: Pdiss ~ Eacc2 • High fields ( >50 MV/m) can be produced in Cu cavities, but only for µsecs, because the rf power required becomes prohibitive and cooling becomes impossible!

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