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@inproceedings{swain:linac2022-mopori06, author = {C. Swain and Ö. Apsimon and A. Salehilashkajani and C.P. Welsch and J. Wolfenden and H.D. Zhang}, title = {{Improvements on the Modified Nomarski Interferometer for Measurements of Supersonic Gas Jet Density Profiles}}, booktitle = {Proc. LINAC'22}, % booktitle = {Proc. 31st International Linear Accelerator Conference (LINAC'22)}, pages = {235--238}, eid = {MOPORI06}, language = {english}, keywords = {laser, vacuum, experiment, focusing, diagnostics}, venue = {Liverpool, UK}, series = {International Linear Accelerator Conference}, number = {31}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {09}, year = {2022}, issn = {2226-0366}, isbn = {978-3-95450-215-8}, doi = {10.18429/JACoW-LINAC2022-MOPORI06}, url = {https://jacow.org/linac2022/papers/mopori06.pdf}, abstract = {{For supersonic gas jet based beam profile monitors such as that developed for the High Luminosity Large Hadron Collider (HL-LHC) upgrade, density profile is a key characteristic. Due to this, non-invasive diagnostics to study the jet’s behaviour have been designed. A Nomarski interferometer was constructed to image jets 30 um to 1 mm in diameter and study changes in their density. A microscope lens has been integrated into the original interferometer system to capture phase changes on a much smaller scale than previous experiments have achieved. This contribution presents the optimisation and results gained from this interferometer.}}, }