The target handling concept of the pbar- separator at FAIR M. Helmecke, V. Gostishchev, R. Hettinger, K. Knie 6th High Power Targetry Workshop Oxford

Outline Boundary conditions for handling concept: - Layout of pbar-separator and target station - Residual dose rates - Assemblies to be disposed Disposal: - Transportation concept in four steps - Handling components: Transport container & shielding flask - Transport to building of hot cell - Layout of hot cell building Outlook & tasks

Overview Antiproton-Separator Building Super-FRS Building

Sections of the pbar separator

Target station with mounted target and magnetic horn BEAM Target: 5 Nickel rods (3mm diameter, 100 mm length) surrounded by graphite in aluminum block, titanium windows Inner conductor of magnetic horn (CERN) Target

Residual dose rate around target station air concrete iron Handling Area Restricted area („Sperrbereich“) Controlled area („Kontrollbereich“) Monitored area („Überwachungsbereich“) According to Radiation protection law („Strahlenschutzverordnung“): Critical value for professionals: 20 mSv/a The dose has to be As Low As Reasonable Achievable (ALARA)! BEAM Input parameters: 5e12p/s, irradiation time: 3.16E7 s

Assemblies to be disposed m ≈ 70 kg m ≈ 120 kg I= 400 kA Activation of about Bq!

How to transport the components to the hot cell? Start point End point Transport on GSI site

Overview Antiproton-Separator Building Super-FRS Building

Transport concept Transport container moves to the shaft (1-2). Crane of carrying frame of the shielding flask lifts up the component (3). Concept accepted in construction permit

Overview of transport I 1 2 3

Bring the target out of the target station Top view, beam from left to right. Inner part of target station is always shielded

Target station and transport container in tunnel Process sequence: Transport container is placed in front of target station. Door of target station and transport container are opened. Component is gripped by a quick coupling system. Trolley moves the component via rail system into the transport container. Doors are closed. Trolley Coupling system Rail system Front door (for intervention only) Inner door

Residual dose rate of open target station Transport container is also used to shield from open target station. (open) open door [Sv/h]

Overview of transport II 1 2 3

Shielding flask: technical design weight: 25 tons Agreement: Design according to a dose rate at the surface of max.100 µSv/h. Detailed specification in progress.

Transport on ground level of the pbar building

Transport outside of the building First positive statement of authorities for transportation concept is already obtained (no ADR requirements!). Special design for trailer necessary; no standard vehicle avaliable. 200 m flat surface

Hot cell of Super FRS: Side view

Layout of hot cell in Super FRS building Helmut Weick, SFRS

Outlook & tasks Detailed specifications of handling components in progress (tendering process starts soon) Thermodynamical considerations, cooling Discussion of remote alignment, specification of adjustment table Detailing of intervention concept Technical intergration, infrastructure requirements => Operation permission

Thank you for your attention!

APPENDIX

Layout of the pbar target area

reaction products B  1/r primary beam does not hit the horn Collecting pbars: Magnetic Horn Magnetic field (B) configuration in Horn B =0 Current, i S. Mohite, CERN/FAIR Workshop on p-bar Sources October

MARS Simulation of the pbar Yields yield = pbars in the ellipse primary protons = 2 × K. Knie, y / cmz / cm E p = 29 GeV

Dose rate calculations for the shielding flask Cross-check with Microshield *) [Sv/h] mmmax. 98 µSv/h mmmax. 95 µSv/h mmmax. 72 µSv/h Nickel target Iridium target *) Kraftanlagen Heidelberg Primary beam activates target directly inside of shielding, but does not hit the flask [cm]