Skip navigation
The Australian National University

History - SHRIMP I

The original SHRIMP (now called SHRIMP I) was designed and built from around 1974 to 1981. Dr Steve Clement, an ANU student who designed and built a mass spectrometer for his PhD) was recruited by Professor William Compston to produce a design for SHRIMP that enabled high mass resolution while maintaining sensitivity. The SHRIMP design was based on a published work by Professor H. Matsuda of Osaka University for a double-focussing mass spectrometer that included a quadrupole lens to minimize second order aberrations. Most of the components were manufactured in the RSES Mechanical and Electronics Workshops. SHRIMP I featured full computer control of data acquisition.

In terms of user operation, the key feature of SHRIMP was the inclusion of the Schwarzchild viewing optical system that allowed accurate placement of the primary ion beam spot on to the target. The stage was controlled by a simple joystick, and the focus was controlled manually by a simple micrometer drive. Once the sample was in focus, the spot would be seen to burn in the same place on the viewing optics monitor. The ease of operation allowed novice users to be operating the instrument independently within a few hours.  

The SHRIMP I stage control was replaced by a computer-controlled version in 2006 to allow automated running from preselected points. This also saw the end of the highly reliable Apple Macintosh II computer with the incorporation of a PC running the LabVIEW software.

SHRIMP I was decommissioned in late 2010 after nearly 30 years of service.  Elements of the ion optical system can be viewed in the SHRIMP laboratory.

SHRIMP I image
SHRIMP I as it appeared in the 1981 RSES Annual Report

 

Updated:  2 December 2015/Responsible Officer:  SHRIMP Group Leader /Page Contact:  WebAdmin