3.9 GHz Cryomodule Shipment to DESY E.Harms on behalf of the Third Harmonic Effort Team (AD & TD, with help from PPD, FESS, BS). What is the 3.9 GHz Effort?.
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Parameter List for ACC39
The Third harmonic system (3.9GHz) is proposed to compensate the nonlinear distortion of the longitudinal phase space due to cosine-like voltage curvature of 1.3 GHz cavities. It will linearize the energy distribution upstream of the bunch compressor thus allowing allowing the achievement of extremely small normalized emittance ~1.10-6 m*rad (few time less than without).
V3=V1 / 9
Example: bunch phase space before and after bunch compressor without (left) and with (right) the 3rd harmonic cavity, calculated for TTF-2 photoinjector.