1 / 14

High-Purity TIG Welding at Michigan State University Chris Compton 5/24/2007

High-Purity TIG Welding at Michigan State University Chris Compton 5/24/2007. Acknowledgments. Michigan State University Steve Bricker, Terry Grimm, Dan Pendell Fermi National Accelerator Laboratory Claire Antoine, Bob Kephart, Rob Schuessler. Outline. Motivation Baseline Measurements

phong
Download Presentation

High-Purity TIG Welding at Michigan State University Chris Compton 5/24/2007

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. High-Purity TIG Welding at Michigan State UniversityChris Compton5/24/2007

  2. Acknowledgments • Michigan State University Steve Bricker, Terry Grimm, Dan Pendell • Fermi National Accelerator Laboratory Claire Antoine, Bob Kephart, Rob Schuessler

  3. Outline • Motivation • Baseline Measurements • First Cavity Test Results • RRR Sample Measurements • High-Purity TIG Welding Chamber • Welding Chamber Design • Construction Status • Research Schedule

  4. Motivation • Reduce E-B welding • Cost and time savings on cavity fabrication • Cost savings on cavity infrastructure • Eases complex welding and tooling • New cavity geometries • End Assemblies • Cavity repairs • Prototyping

  5. Test Results of first TIG cavity Tests results at 2 K Generally infer a surface RRR value smaller than bulk RRR specification

  6. RRR Baseline Measurements • RRR Samples Tested at Fermi • High RRR,value from vendor • Reactor Grade niobium • TIG welded niobium • Bubble Chamber

  7. Welding Chamber Construction [1] • Initial Design • 1.

  8. Welding Chamber Construction [2]

  9. Welding Chamber Construction [3] • Gas system

  10. Welding Chamber Construction [4] • Filter System • Reduce residual gas content < 1ppb, similar to E-B chamber pressure

  11. Welding Chamber Construction [5] • Purity Control • Series 3000 Trace Oxygen Analyzer • Range 0-1 parts per million (ppm) • ±5% Accuracy • 90% full scale response < 10 sec.

  12. RRR Sample Results • Samples sent to Fermi-Welded in TIG chamber

  13. Electron-Beam Welding • RRR degradation from e-b welding environment Welded at Dornier 1994* RRR decreased (20-40 ppb) Welded at ACCEL, 1996 at 2 x 10-5 mbar* (20 ppb) Welded at Zanon, 1995* RRR decreased (25 –60 ppb) Welded at Sciaky 50 kV 48 mA 12 inch/min focus 250/250 (0.05” beam) * TESLA Report 2003-07, W. Singer, et al.

  14. Schedule • Recheck RRR measurements • Chamber modifications (80 ppb best to date) • Main seal (leak) • Torch purge gas • Add Titanium getter • Weld improved niobium samples for RRR measurements • Fabricate single cell cavity using TIG Chamber • 1.3 GHz, Beta = 0.81, Proton Driver Prototype • Dies and infrastructure complete • Niobium from Fermi • Cold performance testing at MSU

More Related