The Korea 4th Generation Storage Ring(Korea-4GSR) project has been launched in 2022. The Korea 4GSR aims to generate the ultra-low emittance beam with the beam current of 400 mA and the beam energy of 4 GeV. In order to accelerate and store the beam to desired parameter, the Storage Ring RF(SRRF) is composed of 10 or more RF Stations and each RF Station includes LLRF(Low Level RF), HPRF(High Power RF), NCC(Normal Conducting Cavity) system. For stable operation and machine safety, sub systems are operated by the Control System for the SRRF. In this paper, we describe the design of the Control System. It will include control network, operating interface, emergency interlock, data archiving and so on.

The High Luminosity Large Hadron Collider (HL-LHC) project foresees the upgrade of a large fraction of primary and secondary collimators of the betatron cleaning system to reduce the collimation impedance. The new collimator design also includes the installation of in-jaw beam position monitors (BPMs) to align the collimators faster and to continuously monitor the beam orbit, ensuring an optimum collimation hierarchy. This upgrade is being done in two stages: 12 of the 22 new collimators were already installed during the Long Shutdown 2 (2018-2021), four primary collimators and eight secondary collimators. They have been used in normal operation since the recommissioning in 2022. This paper discusses the experience gained with collimator BPMs during the recommissioning of the LHC, in particular orbit stability throughout a complete cycle, comparison of the alignment with BPMs and the traditional method based on beam loss monitors, as well as interlock strategies.

J-PARC Main Ring delivers 65 kW (7x10^13 ppp) slow-extracted beam over 2 sec. at 30GeV to the hadron experimental hall to drive various nuclear and particle physics (hadron) experiments. Unexpected behavior of the high-intensity beam caused by the accelerator trip could cause serious machine damage. In March 2021, the first electrostatic septum (ESS1) was broken by a bump orbit distortion caused by the quadrupole field decrease by the trip of a vacuum circuit breaker for the quadrupole power supplies in the straight section. The slow extraction operation was resumed after replacing the ESS with a spare one and shortening the decreasing time of the slow bump power supplies triggered by the trip signal. In the long shutdown after the run, the power supplies for the main magnets have been upgraded for a higher cycle operation for the neutrino oscillation and the hadron hall experiments. The impact of the slow-extracted beam by the new main power supply trip has been investigated by the beam simulation. The simulation showed that each trip of defocusing quadrupole and bending families could deliver a short-pulsed beam and break a gold production target in the hadron hall. The mechanism forming the short-pulsed beam and the countermeasure will be also reported in this paper.

The Advanced Light Source Upgrade (ALS-U) project at Lawrence Berkeley National Laboratory (LBNL) is major upgrade of the ALS that involves the design and installation of a new Accumulator Ring and an upgraded Storage Ring. The RF High Power Amplifier (HPA) with 60 kW CW output power at 500 MHz is a complex and very costly piece of equipment that will provide high power RF to the accelerating cavities in Accumulator Ring. This paper presents the main technical specifications / requirements, features, development status and construction details of various subsystems of the HPA which is being built under con-tract by R&K Company and with engineers at LBNL providing technical oversight and inputs. The HPA detailed design and construction drawings / documents were completed by the vendor and the Final Design Review was successful. Presently, manufacturing of the HPA is in progress. The HPA is self-protecting and the main features consist of a distributed control system employing extensive monitoring of various signals; slow and fast interlock responses; finite state machine controls; and built-in fault tolerance to RF or DC power supply module failures. The theoretical high reliability (MTBF ~ 135000 hours) and high availability (~99.997%) requirements of the HPA requires redundancy in RF modules and DC PS modules for delivering a minimum 48 kW RF output under module fault conditions.

The European Spallation Source (ESS) linear accelerator is designed to accelerate a 62.5 mA, 2.86 ms, 14 Hz proton beam up to 2 GeV for delivery to a rotating tungsten (W) target. The beam transfer sections between linac cryomodules and approaching the target contain over 200 quadrupole, dipole and corrector magnets for beam envelope and trajectory control. In addition, a raster magnet system comprised of dual-plane dipoles is used to reduce beam density on the target. All magnets have been provided to ESS by in-kind collaborators, universities and research institutes across Europe. Following the delivery of these magnets and their respective power converters to ESS, this proceeding presents the status of the installation together with the methodology and first obtained results from integrated testing phase.

The Rare isotope Accelerator complex for ON-line experiments (RAON) is under construction in Daejeon, Republic of Korea. RAON is a device that accelerates various ions generated from ion generators such as Electron Cyclotron Resonance(ECR) and Isotope Separation On-Line(ISOL) system with a superconducting linear accelerator. The low energy superconducting linac(SCL3) is composed of 22 QWR(Quarter wave resonator) cryomodules, 34 HWR (Half wave resonator) cryomodules and 56 warm sections. The cryogenic distribution system for SCL3 has 45 valve boxes dedicated for the cryomdoules. The main purpose of the SCL3 control system is integrated control and monitor of the cryomodules, the vacuum system of the warm sections and the cryogenic distribution system. SCL3 was successfully cooled down to 4.5 K, and it is being commissioned since September 2022. This paper describes in detail the SCL3 control system developed based on Experimental Physics and Industrial Control System(EPICS).

The KEKB personal protection system (PPS) takes care of not only KEKB accelerator, but also PF-AR, Positron Damping Ring and their beam transport lines. The PPS is updated step by step. The new beam transport line to the PF-AR was constructed, and it makes possible that the injector supplies the beam to the 5 storage ring (KEKB LER,HER,PF-AR,PF and Positron damping ring) simultaneously. The positron damping ring was also constructed at the middle of the injector. The injector is not only supply the beam to the damping ring, but also is receive the beam from the damping ring. In this way, the accelerator operation scheme changed dramatically. The logic of the PPS has been changed to adapt the new accelerator operation scheme.

The interlock systems of the CERN Experimental North Area will be consolidated in CERN’s Long Shutdowns 3 and 4, planned to start in 2026. The new interlock systems will guarantee the safe and efficient operation of the machine protection systems for the coming 25 years. The consolidation work includes not only the primary beam areas but also the secondary beam lines and possible new beam lines, as part of the Physics Beyond Colliders program. This contribution describes the limitations of the present North Area interlock systems in terms of reliability and response, and gives the details of the proposed new interlocking systems based on CERN standard hardware, the Warm Magnet Interlock Controller (WIC) and the Beam Interlock System (BIS). The WIC protects the magnets against overheating and additionally interfaces with the power converters and the BIS. The BIS collects operational information from many different systems. The BIS will be SPS machine-cycle dependent and will act on the beam dump system in the SPS and on the beam intercepting devices in the North Area beam lines.

The Beam Interlock System (BIS) is the backbone of the machine protection system throughout the accelerator complex at CERN, including the LHC. The present BIS needs to be upgraded to ensure the required level of dependability and maintainability for the lifetime of the HL-LHC, which is planned to become operational in 2029. The present BIS, designed more than 15 years ago, has proven its reliability but is becoming obsolete and can no longer be deployed in new installations. In this paper we present the progress towards the deployment of a new beam interlocking solution for the CERN accelerators, including several identified new requirements for the HL-LHC. The prototypes of the main interlock boards have been produced and the first tests to validate their functionality were conducted and are described in detail.

The LHC interlock BPM system is used as part of the beam abort system to insure that beam trajectories in those regions are conform with a safe extraction of the beams from the main ring to the dump lines. After more than 10 years of operation, the system has shown some limitations in bandwidth and dynamic range and a study was initiated to look for improvements. Nowadays, with the availability of multi giga sample per second sampling rate ADC converters, there is poten-tial to greatly improve the performance of the system. In this paper a wideband architecture with direct acqui-sition of the BPM electrode signals, time interleaved on the same read-out channel is presented with emphasis on the design and construction of the critical components, and on the measured performance of a prototype system tested in the LHC during the 2022 run.