XAL online model enhancements for J-PARC commissioning and operation

The XAL application development environment has been installed as a part of the control system for the Japan Proton Accelerator Research Center (J-PARC) in Tokai, Japan. XAL was initially developed at the spallation neutron source (SNS) and has been described at length in previous conference proceedings. Included in XAL is an online model for doing quick physics simulations. We outline the upgrades and enhancements to the XAL online model necessary for accurate simulation of the J- PARC linac and transport system.