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Transverse Coherent Transition Radiation (TCTR) Experiment First Ideas for a Measurement Setup. Max-Planck-Institute for Physics Munich Olaf Reimann , Scott Mandry Geneva, October 19, 2012. Outline. Short introduction Why TCTR in frequency domain? Principle of the measurement First results
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Transverse Coherent Transition Radiation (TCTR) ExperimentFirst Ideas for a Measurement Setup
Max-Planck-Institute for PhysicsMunich
Olaf Reimann, Scott Mandry
Geneva, October 19, 2012
Electrooptic sampling
The E-field outside the proton-beam is not modulated
Transverse coherent transition radiation is a good candidate!
Picture taken from A. Pukhov paper
Typical E-field for TCTR atdifferent radial distances
with
with retarded time
results in
Constant radius
Constant current
Scott Mandry is looking todifferent configurations:- Probe placement
- Foil with and without hole
- …
Phase modulation:
Modulation function:
Optical signal (electrical field):
NEW FREQUENCIES!
Amplitudes for different frequencies:
Maximum phaseshift (<0.5)
Measured intensity
20cm bunch, 150µm micro-bunch length,
600µm spacing
100GHz sine-wave, 1ns window
Base frequency 193THz (1.55µm)
1. Harmonic (signal)
2. Harmonic
0 GHz
EO phase modulated spectrum with 8 GHz line separation
Probe setup with a “closed” optical path using GRIN-Lenses and prisms:
Possible length of probe in longitudinal (beam) direction: 5mm
GRIN-Lens with prism (GRINTECH)
Picture stolenfrom anothertalk
Probing section