Taking advantage of the successful CITF locking, a first quick attempt to tune the PR CHRoCC power was performed to understand if there was some margin to improve the power and the shape of the resonating sidebands.

The CHRoCC setpoint was changed from V_DAC = 0.43V to V_DAC = 0.5V at around 16h30 UTC. This should correspond to some 10% increase of radiated thermal power (TBC), and in turn of focal power of the POP lens. A clear trend of the sidebands quickly appeared, bringing down the resonant power of both B4_12MHz and B4_112MHz, while at the same time we noticed a decrease of B2_112MHz and an increase of B2_12MHz. The CITF losed lock when the sidebands went below B4_12MHz < 0.06V and B4_112MHz < 0.03V.

At that point, the previous setpoint of the CHRoCC was restored at 17h00 UTC and, after some time, the CITF lock was acquired again (17h24 UTC). While the temperature of the CHRoCC internal heater went back to its original value, the trend of the sidebands reverted and they reached more or less the same powers they had before.

This seems to be an indication that - should any improving setpoint exist - it should be searched for lower values of the CHRoCC emitted power, but more analysis will be needed.