ATLAS MDT Power Supply DCS Anastasios Iliopoulos 15/08/2006

Contents  Power Supply of MDTs (High & Low Voltage)  ATLAS DCS  PVSS II  FSM  Project Panels & Sub-panels  Dynamic FSM Creation  ActiveX display of the FSM  Today’s status of the project  References

Power Supply of MDTs  Two (or one) multilayers of drift tubes  High Voltage side  Readout side  Each multilayer is operated by a separate high voltage supply (3kV)  Low voltage (5V) is provided to the readout side of each chamber

Detector Control System (DCS) ATLAS TrackDetector MuonSpectrometerElectromagneticCalorimeter HadronicCalorimeter MDTCSCRPC PowerSupply Monitoring High Voltage Low Voltage Temperature, Magnetic Field

PVSS II  PVSS II by ETM  Procedures for:  Communication with hardware  Storing data  Warnings & Errors  Built-in programming language (C++)  Graphic Editor  User abilities  Create his personal application  Send and receive data  Monitor and manage the detector

Finite State Machine (FSM)  Michail Bachtis & Anastasios Iliopoulos: PVSS project for control & monitoring HV & LV for MDT chambers  Based on a FSM  Depending on the state or status of each node, is returned a message and the necessary action is executed OFF RAMP UP ON Over Current TRIP RAMP DOWN HW ERROR Recovery

Created using C++ and some built-in procedures of PVSS DCS team of ATLAS developed a special framework

Sub-panels

My Work – Part I: Dynamic FSM Creation  Automatic FSM generation  Adds chambers to FSM using the desired name and number of HV & LV channels  Sets automatically all necessary parameters  Capability of reading channel parameters from a simple text file  About 900 lines code

My Work – Part II: ActiveX display of the FSM  ActiveX object created with programming in Visual Basic  Displays plugged chambers sorted under logical units  Displays current state or status of each chamber using colour code  Supports colour propagation to the parent levels  About 300 lines code

Today’s status of the project  3 PCs will be used:  Barrel A & C side  EndCap A & C side  “Supervisor” PC  At this time the project is tested, monitoring the LV supply of chambers in sector 13

References  Bachtis Michail, “Development of automatic control system for the MDT-BIS detector”  Bachtis Michail, “Update on the MDT Power Supply DCS”  “ATLAS Muon Spectrometer - Technical Design Report”