[Sneap] Fe beam

[David Weisser]

Stuart,

We have been running Fe recently from a SNICSII.  Typical currents of 56Fe
are 300 to 950 nA for a cathode currents of 600 micro-amps. The source can
run with cathode currents of more than 1 mA.  We don't run enough Cu to
compare Fe to though I expect Fe to be a factor of 5 lower than Cu.

There have been mixed results with FeO.  Sometimes, for some cathodes, the
FeO beam is a factor of 2 to4 times bigger than the Fe beam. For other
samples, the Fe beam is bigger than the FeO.  It depends on how oxidized the
material is.  We have run 57FeO from an isotopic sample getting 100 nA.  The
isotopic material seems to be more oxidized than the natural material.

There is some advantage in using the atomic rather than the molecular beam.
There is no Coulomb explosion in the terminal stripper foil and no dilution
in the energy between the Oxygen and Iron getting to the terminal.  So the
atomic beam can be at higher energy and higher charge state.

It would be interesting to hear how you go.

Regards,

David
********************************************
D.C. Weisser
Nuclear Physics Department
Research School of Physical Sciences and Engineering
Australian National University
Canberra A.C.T. 0200
AUSTRALIA

Tel:    + 61 (0)2 6125 2080
Fax:    + 61 (0)2 6125 0748
Mobile: + 61 (0)414 249 209

david.weisser at anu.edu.au

  -----Original Message-----
  From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu]On
Behalf Of Van Deusen, Stuart B
  Sent: Thursday, 12 June 2008 8:03 AM
  To: sneap at tunl.duke.edu
  Subject: [Sneap] Fe beam


  Hello everyone

  We would like to produce an iron beam using a SNICS II source on our EN
tandem.  We need to do implantation with a reasonable amount of current - we
can get 300-400 nanoamp Cu beams pretty easily, and would like to get the
same from an iron beam.  Advice on how to produce such a beam would be
appreciated.

  Thanks in advance

  Best regards,
  Stuart Van Deusen

  -----------------------------------------------------------
  Stuart B. Van Deusen
  Radiation Solid Interactions and Processing
  Dept. 1111, M/S 1056
  Sandia National Laboratories
  P.O. Box 5800
  Albuquerque, NM  87185-1056
  PH (505)844-7782
  FAX (505)844-7775
  e-mail:  sbvande at sandia.gov


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