The KALI-5000 electron accelerator is currently the most powerful one in operation in India, generating beams of up to 40 Gigawatts power. Comparison: Commercial power plant ratings are stated in terms of Megawatts, [1/1000]th of a Gigawatt.
This paper, authored by Scientists at the Bhabha Atomic Research Centre [BARC], that builds the Kilo Ampere Linear Injector [KALI]-series accelerator, describes the design & performance characteristics of the device.
Besides the need to ruggedize such a device for operational deployment, one would also have to come up with a suitable solution that would be able to supply it with the massive power needed for its operation, in field conditions - major challenges that would need to be overcome before one can see them deployed for military applications.
via IAEA
Godspeed
Related: National Security And 'Nuclear Deterrence' In The Indian Subcontinent