How does that stabilize the satellite? Imagine the satellite as a hand trying to excite a wave in a string by moving up and down. Because the spring is (deliberately) imperfectly elastic, these waves are damped to heat and dissipate. Because the boom is attached to a large mass (the payload) at one end, the angular oscillations tend to cause a whipping motion in the spring that excite waves along the spring. How do they work? There are several types, but one is a long helical spring.
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