UW Clinical Neutron Therapy Program

CNTS Engineering Staff Dave Reid Rob Emery Ruedi Risler James Kuan Eric Dorman Stefani Banerian

Outline: Brief Overview of Clinical Neutron Therapy Program Challenges of upgrading to EPICS in a clinical setting How these challenges influenced design decisions

Program Objectives Clinical Neutron Therapy Clinical Neutron Therapy Hospital Based Facility Hospital Based Facility Neutron Therapy Research Neutron Therapy Research Particle Beams for Medical Based Isotope Research Particle Beams for Medical Based Isotope Research Neutron Irradiation for Engineering Research Neutron Irradiation for Engineering Research

Why Replace Control System? Original equipment no longer supported Original equipment no longer supported PDP/11 and RL02 PDP/11 and RL02 Z-80 SubControllers and custom I/O Z-80 SubControllers and custom I/O Improve system diagnostics, simplify repairs and isolate I/O Improve system diagnostics, simplify repairs and isolate I/O Improve functionality Improve functionality Automated beam tuning Automated beam tuning Neutron IMRT Neutron IMRT Improve operator interface Improve operator interface

Design Requirements Standard equipment available from multiple sources Standard equipment available from multiple sources Communication protocols based on open industry standards – GPIB, TCP, RS-232, Modbus Communication protocols based on open industry standards – GPIB, TCP, RS-232, Modbus Visual software toolkit to develop control programs and user interface Visual software toolkit to develop control programs and user interface Proven, well supported design software Proven, well supported design software

Operational Requirements Machine must be available for patient treatments 4 days a week Long Shutdowns not possible Must be able to run beam at the end of the maintenance day Overcome “Operations Inertia”

Control System Design Philosophy Use PC’s running Linux for controllers Use PC’s running Linux for controllers Locate Analog I/O close to field devices Locate Analog I/O close to field devices Use Ethernet as fieldbus Use Ethernet as fieldbus Distribute Processing Power Distribute Processing Power Isolate Network Traffic Isolate Network Traffic Maintain Separate/Independent Safety System Maintain Separate/Independent Safety System Implement by sub-system Implement by sub-system

Operator Console Dual Operation During Upgrade

Operations Terminal Harmonic Coil A Control

Multiplexed Tuning

Status Display Vacuum System – B Line

CNTS Control System Replacement Outlook 8 Years into project 8 Years into project Manpower most limiting factor Manpower most limiting factor Linux System Administration intensive Linux System Administration intensive Infrastructure in Place – Network, UPS Power, Spare Parts Infrastructure in Place – Network, UPS Power, Spare Parts Operator Interface Operational Operator Interface Operational 2.5 of 7 Major Subsystems Operational 2.5 of 7 Major Subsystems Operational