Design Tasks CPA Design CPA mechanical structure Design

Design Tasks (CPA) • • • • Design CPA mechanical structure Design HV bus and receptacle HV Discharge mitigation plan Design interface to HV bus Build mechanical mockup Design and Build cold test prototype cryostat Design/Build prototype Test CPA prototype Design interface to FC and panel structure Develop CPA manufacturing plan Draft and Review QA Plan Finalize Design review Implement cleanliness and QA procedures Design and Build Full Scale cold test cryostat

Design Tasks (FC) • • • • • resistive divider board design laser beam windows Develop FC mechanical support structure Build mechanical mockup Develop FC electrical design Finalize ground planes design Build full scale prototype Design and construct test cryostat Optimize profile shape and define specifications Optimize isolation cap design and determine safety factor QA plan and design documentation Full scale HV test in LAr at PC 4 Thermal cycle and test FCA prototype Final design review Purchase key components (profiles, PE caps, beams) Acceptance test of key components production readiness review

Prototypes CPA • Small scale HV frame – Test resistive coating. Test interconnects, test electrical interconnections • HV bus – Develop and testing – Full scale prototyping and tests • Large scale mechanical prototype – mechanical interconnections to support and field cage – Check mechanical tolerances and assembly – Develop Installation process and tooling – Cryogenic testing ? • Functional prototype – Cryogenic testing ? – Electrical tests Field cage • End wall prototype – Develop assembly and testing – Develop installation tooling and assembly process – Check interface to CPA and AP • Top/bottom field cage prototype – Develop assembly and testing – Develop installation tooling and assembly process – Check interface to CPA and APA System prototype • Check field performance of corner • Beam Plug – Integration with field cage – testing

Deliverables • Trial Assembly (mechanical mockups) – CPA: 4 columns of 1. 2 mx 6 m modules – FC: • 2 x 2. 3 mx 3. 6 m top modules • 2 x 2. 3 mx 3. 6 m bottom modules • 4 x 1. 5 mx 3. 6 m end wall modules • Proto. DUNE (+ spares) – CPA: 6 columns of 1. 2 mx 6 m modules with HV cup – FC: • 6 x 2. 3 mx 3. 6 m top modules • 6 x 2. 3 mx 3. 6 m bottom modules • 16 x 1. 5 mx 3. 6 m end wall modules – With integrated laser windows and beam plug on some modules