Hostname: page-component-848d4c4894-ndmmz Total loading time: 0 Render date: 2024-06-02T00:53:14.983Z Has data issue: false hasContentIssue false
  • English
  • Français

Nanodiamond Foils for H- Stripping to Support the Spallation Neutron Source (SNS) and Related Applications

Published online by Cambridge University Press:  17 July 2014

RD Vispute ,
Henry K. Ermer ,
Phillip Sinsky ,
Andrew Seiser ,
Robert W. Shaw ,
Leslie L. Wilson ,
Gary Harris  and
Fabrice Piazza
RD Vispute*
Affiliation:
Blue Wave Semiconductors, 1450 S Rolling Rd, Baltimore, MD 21227.
Henry K. Ermer
Affiliation:
Blue Wave Semiconductors, 1450 S Rolling Rd, Baltimore, MD 21227.
Phillip Sinsky
Affiliation:
Blue Wave Semiconductors, 1450 S Rolling Rd, Baltimore, MD 21227.
Andrew Seiser
Affiliation:
Blue Wave Semiconductors, 1450 S Rolling Rd, Baltimore, MD 21227.
Robert W. Shaw
Affiliation:
Chemical Sciences Division, Oak Ridge National Laboratory,Oak Ridge, TN 37831.
Leslie L. Wilson
Affiliation:
Chemical Sciences Division, Oak Ridge National Laboratory,Oak Ridge, TN 37831.
Gary Harris
Affiliation:
Department of Electrical and Computer Engineering, Howard University,Washington, DC.
Fabrice Piazza
Affiliation:
Research Division, Pontifica Universidad Catolica Madre y Maestra,Santiago, Dominican Republic.
*
*Contact author: RD Vispute, Email: rd@bluewavesemi.com
Get access

Abstract

Thin diamond foils are needed in many particle accelerator experiments regarding nuclear and atomic physics, as well as in some interdisciplinary research. Particularly, nanodiamond texture is attractive for this purpose as it possesses a unique combination of diamond properties such as high thermal conductivity, mechanical strength and high radiation hardness; therefore, it is a potential material for energetic ion beam stripper foils. At the ORNL Spallation Neutron Source (SNS), the installed set of foils must be able to survive a nominal five-month operation period, without the need for unscheduled costly shutdowns and repairs. Thus, a single nanodiamond foil about the size of a postage stamp is critical to the entire operation of SNS and similar sources in U.S. laboratories and around the world. We are investigating nanocrystalline, polycrystalline and their admixture films fabricated using a hot filament chemical vapor deposition (HFCVD) system for H- stripping to support the SNS at Oak Ridge National Laboratory. Here we discuss optimization of process variables such as substrate temperature, process gas ratio of H2/Ar/CH4, substrate to filament distance, filament temperature, carburization conditions, and filament geometry to achieve high purity diamond foils on patterned silicon substrates with manageable intrinsic and thermal stresses so that they can be released as free standing foils without curling. An in situ laser reflectance interferometry tool (LRI) is used for monitoring the growth characteristics of the diamond thin film materials. The optimization process has yielded free standing foils with no pinholes. The sp3/sp2 bonds are controlled to optimize electrical resistivity to reduce the possibility of surface charging of the foils. The integrated LRI and HFCVD process provides real time information on the growth of films and can quickly illustrate growth features and control over film thickness. The results are discussed in the light of development of nanodiamond foils that will be able to withstand a few MW proton beam and hopefully will be able to be used after possible future upgrades to the SNS to greater than a 3MW beam.

Keywords

diamondthin filmchemical vapor deposition (CVD) (deposition)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1634: Symposium S – Diamond Electronics and Biotechnology—Fundamentals to Applications VII , 2014 , mrsf13-1634-s03-03
Copyright
Copyright © Materials Research Society 2014 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Liechtenstein, V.Kh., Ivkova, T.M., Olshanski, E.D., Repnow, R., Levin, J., Hellborg, R., Persson, P., Schenkel, T.. “Advances in targetry with thin diamond-like carbon foils” Nuclear Instruments and Methods in Physics Research A , 480 (2002) 185–190.CrossRefGoogle Scholar
Shaw, R.W., Bontrager, D.P., Wilson, L.L., Feigerle, C.S., Luck, C.F., Plum, M.A.. “An Electron Beam SNS Foil Test Stand”, Proceedings of the Particle Accelerator Conference 2009 , Vancouver, BC, Canada, Page 1638, (2009).Google Scholar
Spickermann, T., Borden, M.J., Macek, R.J., Shaw, R.W., Feigerle, C.S., Sugai, I.. “Comparison of carbon and corrugated diamond stripper foils under operational conditions at the Los Alamos PSR” Nuclear Instruments and Methods in Physics Research A , 590 (2008) 25–31 CrossRefGoogle Scholar
Shaw, R.W., Davis, V.A., Potter, R.N., Wilson, L.L., Feigerle, C.S., Peretich, M.E., Liaw, C.J.. “Corrugated Thin Diamond Foils for SNS H- Injection Stripping”, Proceedings of the Particle Accelerator Conference , 16–20 May, Pages 2152-2154, 2005.Google Scholar
Campos, R.A., Trava-Airoldi, V.J., Bagnato, O.R., Moro, J.R., Corat, E.J.. “Development of nanocrystalline diamond windows for application in synchrotron beamlines” Vacuum 89 (2013) 21–25 CrossRefGoogle Scholar
Uggerhoj, U.I., Sellschop, J.P.F.. “Diamond crystals for H- injection” Physical Review Special Topics-Accelerators and Beams 5 (2002) 0735501 CrossRefGoogle Scholar
Tachibana, T., Ichihara, C., Kawakami, N., Yokota, Y.. “Nucleation and initial; growth processes of diamond thin films for stripper foils” Nuclear Instruments and Methods in Physics Research A , 590 (2008) 22–24 CrossRefGoogle Scholar
Liechtenstein, V.Kh., Ivkova, T.M., Olshanski, E.D., Golser, R., Kutschera, W., Steier, P., Vockenhuber, C., Repnow, R., von Hahn, R., Friedrich, M., Kreissig, U.. “Recent investigations and applications of thin diamond-like carbon (DLC) foils” Nuclear Instruments and Methods in Physics Research A , 521 (2004) 197–202 CrossRefGoogle Scholar
Plum, M.A., Holmes, J., Shaw, R.W., Feigerle, C.S.. “SNS stripper foil development program” Nuclear Instruments and Methods in Physics Research A , 590 (2008) 43–46 CrossRefGoogle Scholar
Shaw, R.W., Plum, M.A., Wilson, L.L., Feigerle, C.S., Borden, M.J., Spickermann, T., Irie, Y., Sugai, I., Takagai, A.. “Spallation Neutron Source (SNS) Diamond Striper Foil Development” Proceedings of Particle Accelerator Conference 2007 , Albuquerque, New Mexico, USA, Page 620, 2007.Google Scholar
Butler, J.E. and A.V. Sumant , “The CVD of Nanodiamond Materials,” Chem. Vap. Deposition , 14, 145–160 (2008).CrossRefGoogle Scholar