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

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

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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

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SLIDE 1

Long-Baseline Neutrino Facility LBNF

LBNF Horns Update

Cory Crowley BIWG December 05, 2019

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LBNF

Outline

12.05.19 Cory Crowley | LBNF Horns Update 2

  • Horn A Design Status
  • Horn Design Considerations for B & C
  • Module Design Status
  • Upcoming Work
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SLIDE 3

LBNF

Horn Design – Horn A FEA

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  • 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.

FEA Credit: Zhijing Tang / Ang Lee

12.05.19 Cory Crowley | LBNF Horns Update

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SLIDE 4

LBNF

Revision in Progress

4 12.05.19 Cory Crowley | LBNF Horns Update

Make this 400mm?

  • Requested change per RAL integration meeting 12/4/19.
  • John Back is currently analyzing & this will likely be a reality by next

week.

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SLIDE 5

LBNF

Still Gauging Impact of Updates

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  • 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

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SLIDE 6

LBNF

Horn Design – Current Design Status (Horn A)

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SLIDE 7

LBNF

Horn Design – Current Design Status (Horn A)

7 12.05.19 Cory Crowley | LBNF Horns Update

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SLIDE 8

LBNF

Horn A Design Prototypes – Water Ports

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  • 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

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LBNF

Horn A Design Prototype – Conductor Supports

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  • 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

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LBNF

Horn A Design Prototype – Conductor Supports

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  • Prototype / Design Advancement

– Full thermal, stress / cyclic fatigue, & water flow analysis. – Built mockup for technician assembly training / design review aid. – Electrical analysis remains for ~800V.

Print Credit: Quinn P. FEA Credit: Ang Lee & Jacob Kintner

12.05.19 Cory Crowley | LBNF Horns Update

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SLIDE 11

LBNF

Horn Design – Considerations for Horns B & C

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Max V @PS Max Allow. E Field Max Isolator Path Length Potential Horn A ΔV Horn B ΔV Horn C ΔV ~3700V 35V/.001” 5V/.001” ~550V ~1550V ~1050V

EE Credit: Ken Quinn

12.05.19 Cory Crowley | LBNF Horns Update

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LBNF

Horn Design – Horns B & C FEA

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  • 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.

FEA Credit: Zhijing Tang / Ang Lee

12.05.19 Cory Crowley | LBNF Horns Update

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LBNF

Design Plan

13 12.05.19 Cory Crowley | LBNF Horns Update

  • 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

  • ptimization effort. Is this of use? Or better to wait?
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LBNF

Module Design – Horn Integration

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  • 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

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LBNF

Module Design – Horn & Target Integration

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  • Challenges

– SLB Connection – Utility feedthroughs – Voltage Issues – More and more and more…..

12.05.19 Cory Crowley | LBNF Horns Update

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LBNF

Module Design – Mainframe & Motion Control

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  • 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.

Design Credit: Mike Campbell

12.05.19 Cory Crowley | LBNF Horns Update

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LBNF

Major Push: Standardization of Ancillary Structures

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  • 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

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LBNF

Working Towards Improving Cartoons

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  • Engineering placeholders need to be improved.

– Conductor Profiles – Stripline Design – Water tanks – Connections to Modules

12.05.19 Cory Crowley | LBNF Horns Update

Design Credit: Mike Campbell

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LBNF

Summary

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  • 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