Approach to Key Design Manufacture Operational Issues Peter

Approach to Key Design, Manufacture & Operational Issues Peter Loveridge STFC/RAL LBNF Target CDR 21 August 2019

Project Organisation for Next Stage • We intend to proceed directly from Target Conceptual Design task into Preliminary Design and Feature Prototyping • Ongoing bi-weekly UK/US technical coordination meeting (zoom) – Target/Horn integration, services, Target Hall interfaces, etc… • CAD integration – frequent two-way model exchange underway – space envelopes defined in 3 D CAD – defined common global coordinate system • Back interfacing with BIWG on behalf of UK team. Densham presentation tomorrow! • Ongoing bi-weekly UK team meeting (STFC/Warwick)

Key Design Issues Issue Approach Optimise cantilever target performance Ultimate objective is overall facility performance. Iterative approach with integrated engineering and physics input. Plenty of scope for optimising target outer-container geometry in preliminary design phase for a “win-win”. Thermal management of target structures Address any areas of concern, e. g. titanium container max. temperature, as part of target preliminary design evolution. Plenty of scope to accelerate coolant flow in region of greatest heat deposition. Target/horn interface Minimise complexity for greater robustness. Further CAD integration as part of preliminary design. Use bi-weekly UK/US technical coordination meeting as primary communication channel. Target/exchanger interface Target length is key input to exchanger design. Plan for exchanger to be compatible with cantilever targets in the range 1. 5 m to 1. 84 m long in exchanger preliminary design. Graphite Core Segmentation/Mounting Define core segmentation/mounting scheme as part of target preliminary design. Address core alignment tolerance stack, re: Radial spacing/spring-loading/etc…

Key Manufacturing Issues Issue Approach Long target containment “tube” Need different manufacturing route than that successfully used for T 2 K target. Investigate alternate manufacturing routes and carry out feature prototyping as part of Preliminary design. Upstream cross-flow manifold ‘Design for manufacture’ and feature prototyping planned as part of Preliminary design. Complex geometry of cross-flow manifold seen as challenging to manufacture. Could possibly be made by additive manufacturing (AM) route, but this is something of a departure from what we have done previously on T 2 K target construction. Phase-II Prototype Manufacturing plan is to build one “prototype target” and one “operational target” in future construction phase. 1 st full prototype ~1. 5 m long (ideally a viable backup). Learn lessons from prototype, then first operational target ‘As Long As Realistically Achievable’.

Key Operation / Maintenance Issues Issue Approach Spare target production Objective is 1 year target lifetime at 1. 2 MW operation, i. e. need to build one spare target per year in Maintenance and Operation Phase. But… target build time estimated at ~2 years, so need to build targets in parallel. Beam/Target alignment Incorporate on-line beam position monitor “Hylen Device”. Incorporate features to facilitate beam-based target alignment. Instrumentation/fault diagnostics Monitor helium flow and return temperature and system pressure drop. Potentially monitor activity in helium return-line filter? Anticipate some level of beam-based “health-monitoring” and fault diagnosis. Remote maintenance Minimize risk / number of operations / downtime in remote target exchange procedure (strong driver for cantilever concept selection). Upgradability This project is focused on delivering a target system for 1. 2 MW operation. However, need to consider upgradability. Target and Horn A are upgradeable (consumable items) while module and utilities are not! Capability to upgrade to 2. 4 MW is essential for module, utilities, infrastructure, etc…