# Coherent radio emission from the electron beam sudden appearance

## TL;DR

This paper reports the detection and analysis of coherent radio emission from the sudden appearance of an electron beam, demonstrating it as a form of coherent transition radiation with implications for cosmic ray and neutrino detection.

## Contribution

It provides the first measurement of coherent radio emission from electron beam sudden appearance and compares it with simulations to understand its origin.

## Key findings

- Detected radio emission across 50 MHz to 12.5 GHz
- Confirmed emission as coherent transition radiation
- Implications for cosmic ray and neutrino detection

## Abstract

We report on the measurement of coherent radio emission from the electron beam sudden appearance at the Telescope Array Electron Light Source facility. This emission was detected by four independent radio detector setups sensitive to frequencies ranging from 50 MHz up to 12.5 GHz. We show that this phenomenon can be understood as a special case of coherent transition radiation by comparing the observed results with simulations. The in-nature application of this signal is given by the emission of cosmic ray or neutrino induced particle cascades traversing different media such as air, rock and ice.