Speaker
Description
In the past two decades, RF controls have improved by two orders in
magnitude achieving meanwhile sub-10 fs phase stabilities and 10e-4
amplitude precision. Analog-to-digital-converters (ADCs) are the main
limitation for further increase in detector resolution. Alternative
architectures are therefore needed to overcome this limitation. The
presented work covers a novel application of the suppressed-carrier
detector, which extends conventional heterodyne receivers and improves
the residual time jitter of the regulated RF-field in the cavity far
below 1 fs. A practical implementation of the proposed principle is
presented. The setup was used to drive a superconducting RF cavity at
1.3 GHz frequency at a Cryo Module Test Bench (CMTB) at a gradient of
8MV/m. The measured out-of-loop residual time jitter of the RF field
was 189 as (10Hz to 1MHz). The limiting factors of the setup have been
identified by feeding the measurements to a system model. In conclusion,
a general discussion about future steps is presented.
