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Concerns About Beam 6D Brightness in LCLS: Analyzing FEL Gain and B6 Gun Implications

The analysis of beam 6D brightness by Max Zolotorev and colleagues emphasizes the significance of the B6 gun in the context of the high-luminosity LCLS design. Using a variational formalism, gain estimations reveal optimal settings for beam parameters, underscoring the need to consider the B6 gun for low-charge scenarios and beam conditioning. This paper discusses the implications of beam brightness characteristics and wiggler power for laser-driven applications, ensuring the development of the brightest sources achievable with current technologies.

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Concerns About Beam 6D Brightness in LCLS: Analyzing FEL Gain and B6 Gun Implications

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Presentation Transcript

  1. Why we should worry about beam 6D brightness Max Zolotorev AFRD LBNL

  2. 6D Brightness FEL gain and B6 : estimations start with small signal gain

  3. Derivation based on variational formalism developed by Ming Xie and coworkers but with B6 scaling gives:

  4. gain for optimal  and E Mmin/Mopt

  5. LCLS after longitudinal heater B6gun / 8 contour line 2.5 % contour line 10 % For present LCLS design only B4gun is important For low charge or beam conditioning or both B6gun must be considered

  6. LCLS low charge Mg Q pC  = 28 m ;  = 1 pC S. Reiche, P. Musumeci, C. Pellegrini, J.B. Rosenzweig

  7. Length of wiggler

  8. Power for laser wiggler in free space For brightest sours (LCLS) gun, x=1.5Å, L=1m and b = x P ~ 3 1016 Lw/L g Watt EL~ 200 (Lw/L g )2 kJ

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