Each of two cavity resonators in a klystron, the first of which uses a high-frequency voltage to cause bunching of an electron beam, and the second of which uses this beam to induce a larger high-frequency voltage.
Today’s NYT Connections Answers Apr 23, #317 - Daily Updates & Hints
Today’s Wordle Answer Apr 23 #1039- NYT Wordle Hints & Updates
NYT Mini Crossword Answers Today - The Mini for Apr 23 Solved
NYT Strands Today - Hints, Spangram & Answers for April 23