Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Beamline 2: Spectrometer Calibrations

Beamline 2 end-station and clean room

Beamline 2 end-station and clean room.

Absolute irradiance calibrations based on the calculability of synchrotron radiation are performed on beamline 2. See GOES-R/EXIS and SDO as examples.


  • Undispersed synchrotron radiation and instrument aperture are used as a standard of irradiance
  • First experimental station is located 11.6 m from the tangent point (2 gimbals mounted on a milling table)
  • Class 10,000 clean room access to large chamber, located 17.9 m from the tangent point (gimbals inside of the chamber allow instrument rotation; the whole chamber can be translated)
  • Calibrations provided from 2 nm to 400 nm with uncertainty from 0.6% to < 0.1%
  • Clean, hydrocarbon free vacuum to avoid instrument contamination
  • Calibration of ultraviolet and extreme-ultraviolet detector packages for NASA contractors
Created May 14, 2009, Updated June 8, 2020