Go to Calculations > Select Electronic > Click on More > check the cutoff energy box > customize the value.
Muftah Ahmed I don't really understand the question. What do you mean by "energy range" of the band-structure? Do you just mean when you plot it?
If you look at the numbers that cycled on the left side, it should be not more than 10 but its increases till 30?
Do you mean that you don't need that many conduction bands? The number of bands CASTEP calculates in a spectral calculation is controlled by the parameter
spectral_nextra_bands
in the param file, which sets how many bands you want in addition to the valence bands; or if you're using the legacy bandstructure task the relevant parameter is
bs_nextra_bands
So in your case you probably want just a few conduction bands, perhaps 6 or 8, so you would set
spectral_nextra_bands : 8
in your param file.
It looks like you're using Materials Studio; I can't remember exactly which dialogue box you need, but it will be either on the properties tab when you request the bandstructure calculation, or you'll need to choose the options or advanced button.
Hope that helps,
Phil
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