LBNF LongBaseline Neutrino Facility LBNF Horn Design Cory
LBNF Long-Baseline Neutrino Facility LBNF Horn Design Cory Crowley NBI 2019 - Fermilab October 24, 2019
Outline • Horn System Scope - Components & Arrangement in Target Chase - Major Interfaces • Horn Design - Conductor Layouts - Horn A Design & Considerations for Horns B & C • Module Design - Mainframe / Motion Control • Challenges • Summary 2 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
System Scope – Arrangement in Target Chase + Major Components • Three Horn System – – 3 Horns A, B, & C + Support Modules with included stripline penetration blocks. Target is integrated into Horn A & supported from a single module. Each module provides utility & instrumentation path to supported components. 1. 2 MW initial horn design; 2. 4 MW upgradable. Modules designed for 2. 4 MW. 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
System Scope – Major Interfaces 4 Energy Range Lifetime Requirements Required Prototypes Peak Current Stripline Design Max Assembly Weight 60120 Ge. V 100, 000 Pulses Horn A + Target & Horn B/C Stripline 300 k. A / 0. 8 ms Pulse Width 9 -layer Balanced ~55 Tons (Horn B) 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn Design – Conductor Layouts Length = 2304. 7 mm Horn A I. C. Diameter = 516. 0 mm Length = 3397. 1 mm Nu. MI Horn 1 I. C. (Reference) Length = 4127. 8 mm Diameter = 412. 8 mm Length = 2313. 9 mm Diameter = 1383. 0 mm Horn B I. C. Horn C I. C. • Weld Count – – – 5 Horns A, B, & C will each require a minimum of 2 welds. B & C may require 3. Weld count has major implications for fabrication time & expense. Relation of welding time to weld count, n, seems to fall in the range of n^2 to n^3. Welding / straightening / pit repair. Repair time is directly related to weld length (n# of flaws per inch of weld). 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn Design – Horn A FEA Credit: Zhijing Tang / Ang Lee • Inner & Outer Conductors – Acceptable max temperatures of 65 C & min S. F. of 2. 2 w/6061 -T 6. Increase to 2. 8 w/6013 -T 6 due to fatigue life increase (124 MPa vs. 97 MPa). – Should take advantage of better materials on inner conductor & high-stress stripline regions. • Stripline – Analyzed for temperature & stress concerns, basic modal analysis. Must be experimentally tested & verified. 6 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn Design – Horns B & C FEA Credit: Zhijing Tang / Ang Lee • Inner & Outer Conductors – Very resilient designs utilizing 6061 -T 6. Max conductor temp 28 C, need to incorporate equalization sections (80 C) into actively cooled conductor volume. • Stripline – Analyzed temperature & stress, basic modal analysis. Must also be experimentally tested & verified. B & C design should be a mirror. 7 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn Design – Current Design Status (Horn A) 8 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn Design – Current Design Status (Horn A) 9 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn A Design Prototypes – Water Ports • LBNF Horns pursue a revision of port design as compared to Nu. MI / BNB. Different from T 2 K as well. • Small footprint, inexpensive, immediate assembly, higher pressure rating, & reduced component count. • Required prototype testing in preparation for design review & to verify resilience of concept. 10 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn A Design Prototype – Conductor Supports • Conductor supported by 3 rods in tension as opposed to compression. • Tension method required for larger horns due to L^2 term in critical buckling denominator. ~1. 5 m diameter horns would need large spacers if using available designs. • Desire to make a resilient, minimal mass, universal conductor support. 11 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn A Design Prototype – Conductor Supports Print Credit: Quinn P. • Prototype / Design Advancement – Full thermal, stress / cyclic fatigue, & water flow analysis. – Built mockup for technician assembly training / design review aid. FEA Credit: Ang Lee – Electrical analysis remains for ~800 V. & Jacob Kintner 12 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Horn Design – Considerations for Horns B & C EE Credit: Ken Quinn Max V @PS Max Allow. E Field Max Isolator Path Length Potential Horn A ΔV Horn B ΔV Horn C ΔV ~4500 V 35 V/. 001” ~550 V ~1050 V 13 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Module Design – Horn Integration • Mainframe Placement – Endwalls & stripline shielding block (SLB). • Challenging SLB Connection – Increased clamping surface area. – Increased voltage potential at Horn C (4. 5 k. V). – Increased reusability / resilience. 14 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Module Design – Mainframe & Motion Control • Construction Design Credit: Mike Campbell – Plate frame, pinned & bolted. – Select areas of stainless steel where required. – Allows for ¾” gap to all shield blocks for remote alignment of horn. – Designed for life of facility. • Motion Control Concept – Simple sliding block & pad joints for horizontal translation. – Vertical actuation internal to module mainframe. 15 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Design Challenges • Fabrication: carried major risks until ~2018. • Voltage potential / corona inception: 4. 5 k. V is not trivial. • Corrosion: plating & anodizing critical elements has advantages, but must keep a (large) anode. • Address all the details…. • Temperature monitoring: Any thoughts? 16 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
Summary • Horn & Support Structure design progressing according to plan. • Roughly 1 year remaining on final design of Horn A, followed by fabrication start of conductors & stripline components. • Anticipating additional prototyping: - Critical stripline ceramics (~1000+). - Horn A + Stripline. - Horn B & C Stripline. • Efforts ongoing to integrate removable target utilities throughout support module. • Maintaining vendor base and fabricability. • Still opportunities for collaboration! - Horn instrumentation, shielding modules, & specialized vendor base. 17 10. 24. 19 Cory Crowley | LBNF Horn Design LBNF
- Slides: 17