# Ion Energy instrument

**URL:** <https://forum.spis.org/t/ion-energy-instrument/1604>\
**Category:** SPIS\
**Created:** [9 September 2026 09:34 UTC](https://forum.spis.org/t/ion-energy-instrument/1604 "2026-09-09T09:34:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sadi\_carnot](https://forum.spis.org/letter_avatar_proxy/v4/letter/s/9fc29f/32.png) [@sadi\_carnot](https://forum.spis.org/u/sadi_carnot)\
**Post date:** [9 September 2026 09:34 UTC](https://forum.spis.org/t/ion-energy-instrument/1604/1 "2026-09-09T09:34:51Z")

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To all SPIS users

I am studying the interaction between a spacecraft and EP plume. I am trying to add instrument to evaluate the ion’s energy. However, I am not sure what I should choose at SPIS. I think there are a few options. 1.Velocity distribution function sensor 2.Total energy sensor 3.Total energy distribution function sensor 4.Energy distribution function sensor 5.Mean kinetic energy sensor.