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The term is also encountered in high-speed morse operation, eg a "Printing Undularor".

See "The Secret Wireless War" by Geoffrey Pidgeon. — Preceding unsigned comment added by 14.207.18.233 ( talk) 15:27, 3 April 2023 (UTC) reply

Article is a bit short on information, I think it should mention what the device is used for, and why. -- GalFisk 09:46, 20 June 2006 (UTC) reply

I thing the distinction between both should be k>1 and k≤1 (indstead of k≫1 and k≪1) because at k=1 the radiation cones start overlaying. Anyway, in the current description, what would a device with k≈1 be called? — Preceding unsigned comment added by 141.34.3.113 ( talk) 09:31, 19 August 2013 (UTC) reply

The undulator picture does not follow the right hand rule for Lorentz force, assuming the arrows indicate B field direction and the particle beam is composed of electrons (as stated in the caption). — Preceding unsigned comment added by 157.82.193.71 ( talk) 07:35, 22 March 2017 (UTC) reply

I noticed the same too. The particle deflection is shown opposite to what is expected from Lorentz force. Can someone verify it and correct if needed? 174.16.196.10 ( talk) 18:51, 10 January 2023 (UTC) reply