For a positive real number $a$, let $C$ be the cube with vertices at $(\pm a, \pm a, \pm a)$ and let $T$ be the tetrahedron with vertices at $(2a,2a,2a),(2a, -2a, -2a),(-2a, 2a, -2a),(-2a, -2a, -2a)$. If the intersection of $T$ and $C$ has volume $ka^3$ for some $k$, find $k$.
1. **Identify the vertices of the cube \( C \) and the tetrahedron \( T \):**
   - The cube \( C \) has vertices at \((\pm a, \pm a, \pm a)\).
   - The tetrahedron \( T \) has vertices at \((2a, 2a, 2a)\), \((2a, -2a, -2a)\), \((-2a, 2a, -2a)\), and \((-2a, -2a, 2a)\).

2. **Determine the volume of the cube \( C \):**
   - The side length of the cube \( C \) is \(2a\).
   - The volume of the cube \( C \) is:
     \[
     V_C = (2a)^3 = 8a^3
     \]

3. **Determine the volume of the tetrahedron \( T \):**
   - The volume of a tetrahedron with vertices \((\mathbf{v}_1, \mathbf{v}_2, \mathbf{v}_3, \mathbf{v}_4)\) can be calculated using the determinant formula:
     \[
     V_T = \frac{1}{6} \left| \det \begin{pmatrix}
     x_2 - x_1 & y_2 - y_1 & z_2 - z_1 \\
     x_3 - x_1 & y_3 - y_1 & z_3 - z_1 \\
     x_4 - x_1 & y_4 - y_1 & z_4 - z_1
     \end{pmatrix} \right|
     \]
   - Using the vertices \((2a, 2a, 2a)\), \((2a, -2a, -2a)\), \((-2a, 2a, -2a)\), and \((-2a, -2a, 2a)\), we set \((x_1, y_1, z_1) = (2a, 2a, 2a)\) and calculate the matrix:
     \[
     \begin{pmatrix}
     0 & -4a & -4a \\
     -4a & 0 & -4a \\
     -4a & -4a & 0
     \end{pmatrix}
     \]
   - The determinant of this matrix is:
     \[
     \det \begin{pmatrix}
     0 & -4a & -4a \\
     -4a & 0 & -4a \\
     -4a & -4a & 0
     \end{pmatrix} = -64a^3
     \]
   - The volume of the tetrahedron \( T \) is:
     \[
     V_T = \frac{1}{6} \left| -64a^3 \right| = \frac{64a^3}{6} = \frac{32a^3}{3}
     \]

4. **Find the intersection volume of \( T \) and \( C \):**
   - The intersection of \( T \) and \( C \) is a smaller tetrahedron within the cube.
   - The vertices of the smaller tetrahedron are the midpoints of the edges of the larger tetrahedron that lie within the cube.
   - The volume of the smaller tetrahedron is one-eighth of the volume of the larger tetrahedron because it is formed by connecting the midpoints of the edges of the larger tetrahedron.
   - Therefore, the volume of the intersection is:
     \[
     V_{\text{intersection}} = \frac{1}{8} \times \frac{32a^3}{3} = \frac{4a^3}{3}
     \]

5. **Determine the value of \( k \):**
   - The volume of the intersection is given by \( ka^3 \).
   - Therefore, \( k = \frac{4}{3} \).

The final answer is \( \boxed{\frac{4}{3}} \).