creation of control systems in pvss for devices in the alice detector a large ion collider...
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Creation Of Control Systems In PVSS For Devices In The ALICE Detector
A Large Ion Collider Experiment
A dedicated heavy-ion detector at LHC (Large Hadron Collider)
Studies proton-proton and nucleus-nucleus collision
Experiment consists of 15 detectors including the inner tracker system and electromagnetic calorimeter
Figure 1. Graphical image of the ALICE detector
Figure 3. ISEG EHC 238 high voltage crate and corresponding panels
Robert Thomen, Physics Department, Creighton University, Omaha NE
68178Required for precise positioning of the inner tracker
Picture of laser is compared with a control image for exact alignment.
Latest captured image and comparison image are displayed (pixels with differences appear red, unchanged pixels appear white)
Design requirements demand an image processing time of less than 10 seconds.
Figure 4. A sample panel created in PVSS for the Inner Tracker Camera. Includes control buttons, camera image, and comparison image.
ALICE ELMB
PVSS
We gratefully acknowledge the Office of Science of the US Department of Energy for its continued support of this project.
Inner Tracker CameraProzessvisualisierungs und Steuerungssystem
Process visualization and control system.
Monitors and operates hardware and software devices
Projects implemented in PVSS:
Temperature monitoring for EMC
High voltage control for EMC
Alignment monitor for Inner Tracker System
Embedded Local Monitor Board
Used for temperature monitoring
Board contains Analog to Digital Converter
EMC signal gain is temperature dependant
High and Low Voltage
Used by avalanche photodiodes to produce large signal gain in EMC
Low Voltage supplies are used for EMC readout and digitization electronics
The time required for an individual image capture and processing was measured to be 5.1 ± 1.2 seconds. (Distribution shown in Figure 5.)
ALICE (A Large Ion Collider Experiment) is one of the maindetectors in the LHC (Large Hadron Collider) at CERN.PVSS (Prozessvisualisierungs- und Steuerungssystem) is acontrol system used to operate, monitor, and collect datafrom hardware devices and record the data which they produce.This project is concerned with the development andtesting of several PVSS subsystems. Prototype systems havebeen created for voltage/current temperature monitors,front end electronics control, high and low voltage controls,and video monitoring. User interfaces will be presented andmeasurements of control response times will be comparedto design requirements.
ABSTRACT
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Figure 2. The ELMB and corresponding monitor panel.
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ITS
Inner Tracking System
Consists of Silicon Pixel Detector, Silicon Drift Detector, and Silicon Strip detector.
Tracking must be matched between the ITS and the other tracking chambers
Alignment is critical for accurate measurements
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EMCElectromagnetic Calorimeter
Measures energies of particles created in the collision• •
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Figure 5. Chart of time delay data
Response time is within design specifications.
The ITS camera and software will be implemented on at CERN in December 2006.
Voltage supplies and temperature monitors are ready use with the prototype EMC detector at a test beam setup in July 2007
Future plans involve fitting a Gaussian curve to the intensity distribution of laser image. More accurately locating the beam’s location will allow a more precise alignment of the ITS.
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• • Timing Measurements
Evaluation and Future Plans
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