# Neutron flux in a graphite stack

**URL:** <https://openmc.discourse.group/t/neutron-flux-in-a-graphite-stack/3916>\
**Category:** User Support\
**Created:** [February 15, 2024, 4:12pm UTC](https://openmc.discourse.group/t/neutron-flux-in-a-graphite-stack/3916 "2024-02-15T16:12:48Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![Shimwell](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/shimwell/32/3876_2.png) [@Shimwell](https://openmc.discourse.group/u/Shimwell)\
**Post date:** [February 29, 2024, 11:06pm UTC](https://openmc.discourse.group/t/neutron-flux-in-a-graphite-stack/3916/20 "2024-02-29T23:06:06Z")

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> [@NHale](#):
>
> `openmc.EnergyFilter(np.linspace(0, 0.030, 1)`

Not sure but I wonder if you need a 2nd value in that EnergyFilter, as it is only one value long at the moment. How about putting a 2 at the end

openmc.EnergyFilter(np.linspace(0, 0.030, 2)

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