Uses%20of%20Instrumentation:

1
Uses of Instrumentation
Optimization of luminosity parameters using
dither
knob
SLC example
rad. e/e-
beamstrah.
2
Linac sz simulation
Linac entrance
Longitudinal phase space FEL (LCLS)
Compression stage 1
Asymmetry in sz is important for minimum sE
Compression stage 2
Coherent radiation monitors do not provide the
detail required
Linac exit
(P. Emma)
3
LCLS Bunch length monitor

• S-band deflecting TM11 structure

4
First Order Solution for Lowest Order Deflecting
Mode1,2
Force

• TM11 deflecting field is uniform over aperture,
  2a, and axial force, Fz , is small even for r ?
  1 mm.
• Get aberration-free deflection from this mode3
• Deflection3 5MeV/?(MW)

1 H. Hahn, BNL, 1962-3 2 Y. Garauit, Orsay, 1962
3 G. Loew, et. al., SLAC, 1963-5
5
Bunch length monitor -
Transverse RF Cavity for Bunch Length and
Slice-Emittance Measurements (J. Frisch, X.-J.
Wang, old SLAC 60s)
sz
V(t)
e-
q
t
f ?20?
screen
e- for V 20 MV (sz ? sx)
e- for V 0 sx0
V ? 20 MV at ? ? 20
6
Simulated X-verse structure results - LCLS
Slice emittance and beam correlations
f and p- f