high intensity beam test of beryllium for target and beam window applications n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
High Intensity Beam Test of Beryllium for Target and Beam Window Applications PowerPoint Presentation
Download Presentation
High Intensity Beam Test of Beryllium for Target and Beam Window Applications

Loading in 2 Seconds...

play fullscreen
1 / 18

High Intensity Beam Test of Beryllium for Target and Beam Window Applications - PowerPoint PPT Presentation


  • 97 Views
  • Uploaded on

High Intensity Beam Test of Beryllium for Target and Beam Window Applications. Presented by: Brian Hartsell Contributors: Kavin Ammigan, Patrick Hurh NBI 2012. Why Beryllium?. Graphite radiation damage issues caused LBNE to look at Beryllium for target use.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'High Intensity Beam Test of Beryllium for Target and Beam Window Applications' - jenna-jennings


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
high intensity beam test of beryllium for target and beam window applications
High Intensity Beam Test of Berylliumfor Target and Beam Window Applications

Presented by: Brian Hartsell

Contributors: Kavin Ammigan, Patrick Hurh

NBI 2012

why beryllium
Why Beryllium?
  • Graphite radiation damage issues caused LBNE to look at Beryllium for target use.
    • Complete structural failure at 1021 p/cm2 during BLIP run.
  • Simulations with beryllium components do not seem to line up with the ‘real world’.

Beryllium for Target and Beam Window Applications

beryllium tests and past uses at fnal
Beryllium tests and past uses at FNAL
  • Beam windows
  • Pbar Lithium lens windows
    • Possible damage seen at 0.15mm sigma spot size, no damage at 0.19mm sigma.

Beryllium for Target and Beam Window Applications

beryllium test
Beryllium test

Graphite

Fins

DS

Be Fins

Upstream

  • 1999 testing of NuMI prototype target
    • Beam sigmas of 0.16mm, 0.22mm in x,y at 120GeV
    • 180 pulses, 1.03e13 POT/pulse, 10us pulse
    • Each fin is approx 2mm x 6mm x 25mm

Beryllium for Target and Beam Window Applications

1999 numi test physical inspection
1999 NuMI Test – Physical Inspection
  • Light microscope images show ‘dark spot’ on first fin, upstream side.
    • No marks on other upstream or downstream faces.

Beryllium for Target and Beam Window Applications

1999 numi test physical inspection1
1999 NuMI Test – Physical Inspection
  • SEM images of the spot (left).
    • Also found another spot (right) with similar discoloration.

Beryllium for Target and Beam Window Applications

1999 numi test modeling
1999 NuMI Test – Modeling

Beryllium for Target and Beam Window Applications

output from mars and python script
Output from MARS and Python Script
  • Parse MARS output for energy deposition values.
  • Build a list of locations and corresponding EDep.
  • Generate ANSYS input tables and plots for verification.

Beryllium for Target and Beam Window Applications

ansys beryllium material properties
ANSYS Beryllium Material Properties
  • Temperature dependent material properties used up to 600°C.
    • Bilinear Kinematic Hardening

Beryllium for Target and Beam Window Applications

1999 numi test ansys thermal modeling
1999 NuMI Test – ANSYS Thermal Modeling
  • Temperature from MARS energy deposition results
    • Maximum temperature approximately 560°C.
    • Let fin cool to 20°C before next pulse. Times are not ‘real’.

Beryllium for Target and Beam Window Applications

1999 numi test modeling1
1999 NuMI Test - Modeling

End of pulse – 560°C

  • Maximum principal stress – typical views
    • Deformations shown at ~50x
    • Bulge is ~5µm high, 1mm in diameter after 16 pulses.

Beryllium for Target and Beam Window Applications

1999 numi test modeling2
1999 NuMI Test - Modeling

After cooldown to 22°C

Large tensile preload for next pulse

Maximum principal stress – typical views

Beryllium for Target and Beam Window Applications

1999 numi test modeling3
1999 NuMI Test - Modeling

Plastic strain – at end of 1st pulse

Beryllium for Target and Beam Window Applications

1999 numi test modeling4
1999 NuMI Test - Modeling

Center of fin at beam center:

14k pulses

Point of max

displacement

>1M pulses

Max plastic

strain on surface:

18k pulses

Global maximum

plastic strain:

10k pulses

  • Estimates of life from plastic strain cycling:
    • Very conservative estimates from Coffin-Manson relation

Beryllium for Target and Beam Window Applications

what s wrong here
What’s wrong here?
  • Other Beryllium components have seen comparable beam for many more than 14,000 pulses without failure.
  • Is thickness a factor?
    • Modeled a thin Be window (.5mm) and compared to a thick window (5mm used on Li lens).
    • Thin windows no not appear to fare better.

Beryllium for Target and Beam Window Applications

areas for improvement
Areas for improvement
  • Beryllium material properties
    • Strain rate dependency with temperature effects.
  • Incorporating radiation damage
    • Lithium lens saw ~10M pulses, corresponds to 1DPA in beam center.
  • Move to explicit dynamic simulation package
    • LS-DYNA, AUTODYN, etc
  • Accurate failure mechanism
    • Need more data points with failures of Beryllium.
    • Any beryllium failures from audience?

Beryllium for Target and Beam Window Applications

going forward
Going forward
  • Expand the NuMI test simulation to find number of pulses until plastic strain remains consistent.
  • Sensitivity studies for NuMI test simulation:
    • Beam location, spot size, beam profile (gaussian, flat top, etc), fin geometry, simulation mesh size
  • Look into the possible beryllium window failure in lithium lens.
  • Ultimate goal:
    • Reliable prediction of Beryllium failure given beam parameters and geometry.

Beryllium for Target and Beam Window Applications

thank you
Thank you!

Beryllium for Target and Beam Window Applications