Electrostatic septum SEH 10 Operation during Oxygen run

Electrostatic septum SEH 10 Operation during Oxygen run J. Borburgh TE/ABT

Electrostatic septum • Used for injecting beam into LEIR using an electric field. High Voltage (HV) needed to create field produced with dedicated HV generators. • Criticality: no field = no injection • Similar systems are used in PS and SPS. All these are located outside radioactive areas (central building 359 or at the surface BA 2.

Potential issues with use in high radiation environment • High radiation levels may be an issue for the following systems: • HV generation: Cockroft-Walton generator and they charger electronics and controls are installed directly adjacent to the injection septum (R 2 E). • Insulating liquid in HV feedthrough is prone to decomposition under influence of radiation. • Systems both installed next to injection septum, inside the LEIR ring.

Location of equipment concerned HV generation equipment (operational and spare) inside LEIR

HV generators • Commercially purchased around ~1990. • Datasheet of electrical performance available. • No knowledge of what kind of electronics are used inside. • Spare is installed adjacent to operation generator.

Preferred solution • Move generators outside LEIR (HV cable, signal and control cables not critical w. r. t. cable length. • Install recirculating system on insulating liquid used in HV feedthrough. Can be recovered from ZSTF in SPS that was just decommissioned. Will need installation of insulating liquid piping to and from regeneration station. • Location of displaced systems still to be identified.