A new accelerator complex is being constructed at the Joint Institute for Nuclear Research as a part of the Nuclotron-based Ion Collider fAcility (NICA) project. The goal is to conduct experiments with colliding ion beams (at the first stage of the project) and colliding polarized proton/deuteron beams (at the second stage). Transport beam channels and the systems of beam injection and extraction for synchrotrons and collider rings are an important connecting link for the whole accelerator facility. The design of the primary beam-transport channels and injection/extraction systems are presented. Special attention is paid to various aspects of dynamics of beams in their transfer between the NICA accelerators.

A powerful transverse feedback system (“Damper”) has been installed in LHC. It will stabilise coupled bunch instabilities in a frequency range from 3 kHz to 20 MHz and at the same time damp injection oscillations originating from steering errors and injection kicker ripple. The transverse damper can also be used as an exciter for purposes of abort gap cleaning or tune measurement. The power and lowlevel systems layouts are described along with results from the hardware commissioning. The achieved performance is compared with earlier predictions and requirements for injection damping and instability control.

A powerful transverse feedback system ("Damper") has been installed in LHC. It will stabilise coupled bunch insta- bilities in a frequency range from 3 kHz to 20 MHz and at the same time damp injection oscillations originating from steering errors and injection kicker ripple. The transverse damper can also be used as an exciter for purposes of abort gap cleaning or tune measurement. The power and low- level systems layouts are described along with results from the hardware commissioning. The achieved performance is compared with earlier predictions and requirements for injection damping and instability control.

The system suppressing transverse coherent beam oscillations is an important part of the LHC (CERN). This system compensates injection errors, and together with cooling systems it maintains the luminosity during the working cycle of the accelerator. The unique properties of the beam impose special requirements on the parameters of this system. The required devices are being developed and built at JINR (Dubna) together with CERN and the Ministry of Industry and Science of the Russian Federation. This paper is devoted to a description of the basic units of the system and the current state of affairs.

A powerful transverse feedback system (“Damper”) has been installed in LHC. It will stabilise the high intensity beam against coupled bunch transverse instabilities in a frequency range from 3 kHz to 20 MHz and at the same time damp injection oscillations originating from steering errors and injection kicker ripple. The LHC Damper can also be used as means of exciting transverse oscillations for the purposes of abort gap cleaning and tune measurement. The LHC Damper includes4 feedback systems on 2 circulating beams. The feedback system is described along with first results of the LHC Damper commissioning.