The performance of the NSLS mini-undulator

H. Rarback*, C. Jacobsen, J. Kirz, I. McNulty

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


In 1986, the National Synchrotron Light Source installed a ten-period soft X-ray "mini-undulator" as a test bed for a longer device. We have used this device as a radiation source for soft X-ray holography and scanning microscopy, both of which require high brightness for practical operation. We present here calculations and measurements of the undulator output. Using beamline X-17T, we have measured the spectral intensity and brightness of the undulator. The results are in good agreement with calculations and indicate that even a short undulator, when coupled with a low-emittance storage ring, can produce extremely bright radiation. High brightness means large spatially coherent flux. We believe our measured value of 1011 photons/s/1% BW was the highest continuous spatially coherent flux then available from any source of soft X-rays.

Original languageEnglish (US)
Pages (from-to)96-105
Number of pages10
JournalNuclear Inst. and Methods in Physics Research, A
Issue number1-3
StatePublished - Apr 1 1988

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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