http://wiki.dimtel.com/ 2026-04-24T16:17:25+00:00 http://wiki.dimtel.com/ http://wiki.dimtel.com/lib/exe/fetch.php?media=wiki:logo.png text/html 2018-10-05T16:10:45+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.dimtel.com/doku.php?id=dim:appnotes:llrf_two_cav&rev=1538755845&do=diff Tuning procedure: two cavity station This is a rough tuning procedure for a two cavity RF station under LLRF9 control. The procedure assumes that channel loss factors have already been established (based on power meter measurements, cavity parameters, possibly with beam-based calibration). text/html 2025-08-31T05:34:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.dimtel.com/doku.php?id=dim:appnotes:phase_servo&rev=1756618468&do=diff Phase Servo Loop Setup Block Diagram Let's start from the block diagram of the phase servo loop. iGp12 averages ADC input for 500(nbsp)ms (number of samples is dependent on the RF frequency). Input offset (due to the non-zero mixer offset) is subtracted from that average producing the error signal. The error signal is multiplied by the loop gain and loop sign (+/-1). Resulting value is integrated, producing the delta signal. Delta is added to the longitudinal phase shifter setpoint, thus ad… text/html 2025-08-21T23:51:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.dimtel.com/doku.php?id=dim:appnotes:start&rev=1755820270&do=diff Application Notes * Longitudinal feedback timing (2008, original iGp) * Drive signal generator (2008, original iGp, ARB based generator) * Phase servo loop setup