Segment Violation Error in PyROOT

[Wile_E_Coyote]

I guess you need:
chn0 = arr.array('l', [0]) # one "Int_t"
and then:
hist.Fill(chn0[0], ticks)

Please do read the links given in this post:

Looping to create new Branches with different data

array('i', [0]) is a 2-bytes signed integer so you need "leafname/S" array - Efficient arrays of numeric values TTree → Add a column (“branch”) holding fundamental types and arrays thereof