Speaker
Description
With its expansive field-of-view and nearly 100% duty cycle, the LHAASO Water Cherenkov Detector Array (WCDA) is uniquely positioned to monitor Very-High-Energy (VHE) emissions from transient and variable sources, including Gamma-Ray Bursts (GRBs), Active Galactic Nuclei (AGNs), and galactic sources such as pulsars and novae. However, many of these targets remain elusive due to limited acceleration power or severe Extragalactic Background Light (EBL) absorption at higher energies, often falling below the current operational sensitivity of the WCDA.
To maximize the array’s scientific potential, we have developed the Line-of-Sight Trigger (LOST), a specialized triggering framework designed to extend the WCDA energy threshold into the sub-100 GeV regime. The LOST system enables the WCDA to emulate the pointing capabilities of a telescope, focusing on specific source directions to facilitate a relaxed trigger condition and the reconstruction of low-energy events. To address the inherent information sparsity of these events, we employ advanced Artificial Intelligence (AI) models for robust gamma/hadron separation. We present the estimated performance of the LOST system based on comprehensive simulations and report on latency benchmarks achieved during recent online operations.
