Differential Pumping Vacuum Components

New vacuum compatible spectroscopy accessories are now available from McPherson. Advanced laser high harmonic generation (HHG) sources may be applied to application areas such as Attosecond science, time-resolved pump-probe spectroscopy, photoelectron emission spectroscopy, high-resolution imaging and possibly extreme ultraviolet (EUV) optical clocks. These sources normally require (relatively) high pressure gas leaked into a vacuum vessel to be excited by pulsed NIR laser. The high gas load must be dealt with to allow broad application of these sources to ultra high vacuum (UHV) experimental chambers and detectors requiring low pressure for safe and proper operation.

The DP100 differential pumping accessory is designed for this purpose and is available with a range of fittings suitable for use with commercial vacuum components as well as beam apertures tailored for specific applications.

The DP100 is a high vacuum pumping tee with a removable, conductance limiting aperture. The tendency of pressure to equalize in vacuum systems can sometimes interfere with experiments or prevent some detectors from operating properly. The DP100’s conductance limiting aperture creates a transition between an area of high pressure and a vacuum spectrometer or an experimental chamber at lower pressure. To best match optical systems, apertures with circular or rectangular cross sections are now available.

The DP100 can allow up to three orders magnitude pressure differential depending on the size of the conductance limiting aperture and the capacity of the mounted pump. The pressure ratio increases linearly with the speed of the high vacuum pump. Use the DP100 as a differential pumping section or as a more conventional pumping or gauging tee, gas inlet, or electrical feed through. McPherson is pleased to offer the DP100 with a range of fittings suitable for use with commercial vacuum components as well as beam apertures tailored for specific applications.

McPherson, Chelmsford, MA, USA manufactures a wide variety of optical instruments and systems used to measure wavelengths of light, and serves customers in university and research laboratories worldwide.