LBNF Horns Update Cory Crowley BIWG December 05, 2019 Outline - PowerPoint PPT Presentation

LBNF Long-Baseline Neutrino Facility LBNF Horns Update Cory Crowley BIWG December 05, 2019

Outline • Horn A Design Status • Horn Design Considerations for B & C • Module Design Status • Upcoming Work 12.05.19 Cory Crowley | LBNF Horns Update 2 LBNF

Horn Design – Horn A FEA FEA Credit: Zhijing Tang / Ang Lee • Inner & Outer Conductors Analyzed Last Year – Acceptable max temperatures of 65C & min S.F. of 2.2 w/6061-T6. Increase to 2.8 w/6013-T6 due to fatigue life increase (124MPa vs. 97MPa). – 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. 12.05.19 Cory Crowley | LBNF Horns Update 3 LBNF

Revision in Progress • Requested change per RAL integration meeting 12/4/19. • John Back is currently analyzing & this will likely be a reality by next week. Make this 400mm? 12.05.19 Cory Crowley | LBNF Horns Update 4 LBNF

Still Gauging Impact of Updates • Most significant update is different target design. – Shorter target length (~150cm) & no D.S. target mount needed. – Cone transition on U.S. end (which horn A must mimic) to reduce deflection. • Should reduce horn EDEP further on D.S. end where most problematic. • Stress / erosion concerns arose after NuMI Horn prototype disassembly. – Found that wear resistant nickel coating wore through in several areas. • Horn A inner conductor changed from 2mm thick to 2.5mm thick to allow more material for stress distribution / reduced joule heating / Safety Factor. • Endcap had to be stiffened throughout analysis iterations due to high magnetic stresses from 300kA pulse. • Thicker wall also helps keep circularity requirements due to 30cm diameter cone on U.S. end & keep conservative design with unknown erosion effects, 300kA pulse, variability in cooling, etc … • Still need to document heat input into horn A I.C. from hot target tube. 12.05.19 Cory Crowley | LBNF Horns Update 5 LBNF

Horn Design – Current Design Status (Horn A) 12.05.19 Cory Crowley | LBNF Horns Update 6 LBNF

Horn Design – Current Design Status (Horn A) 12.05.19 Cory Crowley | LBNF Horns Update 7 LBNF

Horn A Design Prototypes – Water Ports • LBNF Horns pursue a revision of port design as compared to NuMI / BNB. Different from T2K 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. 12.05.19 Cory Crowley | LBNF Horns Update 8 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. ~1.5m diameter horns would need large spacers if using available designs. • Desire to make a resilient, minimal mass, universal conductor support. 12.05.19 Cory Crowley | LBNF Horns Update 9 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 ~800V. & Jacob Kintner 12.05.19 Cory Crowley | LBNF Horns Update 10 LBNF

Horn Design – Considerations for Horns B & C EE Credit: Ken Quinn Max V Max Allow. Max Isolator Path Horn A Horn B Horn C @PS E Field Length Potential ΔV ΔV ΔV ~3700V 35V/.001” 5V/.001” ~550V ~1550V ~1050V 12.05.19 Cory Crowley | LBNF Horns Update 11 LBNF

Horn Design – Horns B & C FEA FEA Credit: Zhijing Tang / Ang Lee • Inner & Outer Conductors – Very resilient designs utilizing 6061-T6. Max conductor temp 28C, need to incorporate equalization sections (80C) 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. 12.05.19 Cory Crowley | LBNF Horns Update 12 LBNF

Design Plan • Would like to confirm: – Outer conductor diameter is large enough that incorporation of equalization sections has no impact. – Flaring of I.C. to reach O.C. outside of advertised focal length has trivial impact on physics. • Good models will take a little time, but I could provide dimensions for flux simulations that would be on par with what Laura used for optimization effort. Is this of use? Or better to wait? 12.05.19 Cory Crowley | LBNF Horns Update 13 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 (3.7kV). – Increased reusability / resilience. 12.05.19 Cory Crowley | LBNF Horns Update 14 LBNF

Module Design – Horn & Target Integration • Challenges – SLB Connection – Utility feedthroughs – Voltage Issues – More and more and more….. 12.05.19 Cory Crowley | LBNF Horns Update 15 LBNF

Module Design – Mainframe & Motion Control Design Credit: Mike Campbell • Construction – 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. 12.05.19 Cory Crowley | LBNF Horns Update 16 LBNF

Major Push: Standardization of Ancillary Structures • Everything needs to have identical distance to beam centerline. – Stripline block pads. – Carriage Support Beams. – Stripline Connection Point to Horns. 12.05.19 Cory Crowley | LBNF Horns Update 17 LBNF

Working Towards Improving Cartoons • Engineering placeholders need to be improved. – Conductor Profiles – Stripline Design – Water tanks – Connections to Modules Design Credit: Mike Campbell 12.05.19 Cory Crowley | LBNF Horns Update 18 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. • Need to advance Horn B & C conductor design to help advance target chase / modules / simulations... • Likely going to re-analyze Horn A stripline due to design changes, but Horn A conductor analysis still valid after transition to cone on U.S. end. Should be judicious with FEA (Time / $$$). • What should I provide? Horn B & C revised equalization specs? 12.05.19 Cory Crowley | LBNF Horns Update 19 LBNF