"Noncentrality" table for 1 and 8 degrees of freedom (df).
See Mathematica code below on how to get numbers for
various power/df combinations

    
power	df=1      df=8
0.40    2.91145   6.71289
0.50    3.84102   8.40464
0.60    4.89857   10.2362
0.70    6.17200   12.3493
0.75    6.94031   13.5872
0.80    7.84886   15.0221
0.85    8.97839   16.7697
0.90    10.5074   19.0827
0.95    12.9947   22.7437
0.97    14.7514   25.2695
0.99    18.3725   30.3563
0.999   25.5045   40.0366

Mathematica code (for df=8 and power=0.95 at alpha=0.05)

<< Statistics`ContinuousDistributions`
nc[df_, g_] := NoncentralChiSquareDistribution[df, g]
c[df_] := ChiSquareDistribution[df]
df = 8; pw = 0.95; a = 0.05;
FindRoot[a == 1 - CDF[c[df], Quantile[nc[df, x], 1 - pw]], {x, 0, 100}]