### restricting a NumberField to the reals for the calculation of a Galois group

I am trying to calculate a Galois Group. I have the following code

```
x=QQbar(7**(1/8))
L.<x>=NumberField(x.minpoly())
G=L.galois_group(names='x')
print(G)
```

The output is

```
Galois group of Galois closure in x of Number Field in x with defining polynomial x^8 - 7
```

I would like to restrict the number field L to the reals. My number field should be non-complex and contain the real root of the minimum ~~polynomial. ~~polynomial only. How do I acchieve that in my code?

Thanks