1. André Augustinus 18 March 2002 ALICE Detector Controls Requirements

2. André Augustinus 18 March 2002ALICE DCS Workshop 2 Overview  Introduction: Why and What on Requirements  ALICE Detector controls: Ideas on architecture  First analysis of User Requirements Documents: High Voltage Low Voltage Cooling Front End Electronics Other

3. André Augustinus 18 March 2002ALICE DCS Workshop 3 Introduction  Aim of DCS requirements Estimate the size of the whole control system Spot common issues across detectors Investigate common solutions to common problems Avoid duplication of work More efficient maintenance Propose solutions for individual detector needs Use of standards (hardware and software) Preserve a coherent DCS Requirements; Why?

4. André Augustinus 18 March 2002ALICE DCS Workshop 4  Requirements should cover: All sub systems HV, LV, Cooling, FEE, … Numbers Type of equipment Boundary conditions and limitations How to read sensors Location of equipment (cable lengths, radiation) Introduction Requirements; What?

5. André Augustinus 18 March 2002ALICE DCS Workshop 5  Requirements also should cover Functional Requirements: What should the control system do Interaction with other (sub-)systems Safety aspects Typical operation Planning: When do you need what Introduction Requirements; What?

6. André Augustinus 18 March 2002ALICE DCS Workshop 6  The users (you, the detectors) will gain by reducing the resources needed to develop your control system You will get a “framework” in which you can easily develop your control applications The better we know your needs, the better this framework will be usable to control your detector Motivation

7. André Augustinus 18 March 2002ALICE DCS Workshop 7 Motivation  We aim for a homogeneous and intelligent control system Ease experiment operation Increase efficiency Decrease the risk of operator errors or even damage The better we know how your want to operate your detector, the more efficient we can make the higher levels of the control system

8. André Augustinus 18 March 2002ALICE DCS Workshop 8 Some background  Since it is important that you understand the context in which your control system will be operating; I would like to explain the current ideas on the future detector control system for our experiment  I would therefore at this point like to open a parenthesis

9. André Augustinus 18 March 2002ALICE DCS Workshop 9 Open Parenthesis… (

10. André Augustinus 18 March 2002ALICE DCS Workshop 10 ALICE D etector C ontrol S ystem  A possible approach: Each detector arrives in 2005 with its own hardware and software  Resource intensive development and we will end up with 15 different control systems  Need many hands to run the experiment  Integration only at high cost Central team can rest and lean back until 2005

11. André Augustinus 18 March 2002ALICE DCS Workshop 11 ALICE D etector C ontrol S ystem  A more realistic approach:  The DCS should allow centralised operation By a single operator Not necessarily a DCS expert From a central control room … to have the Detector Controls System (DCS) ready for exploitation by the end of 2005, allowing to control and operate the experiment (from a central operator workplace) during all modes of operation …

12. André Augustinus 18 March 2002ALICE DCS Workshop 12 ALICE D etector C ontrol S ystem Central (or exclusive) operation:  A central (non-expert) operator should be the only “master” of the system be able to give the necessary commands to run the experiment efficiently (minimal downtime) “Generic” commands at all times be informed about anomalies in the experiment

13. André Augustinus 18 March 2002ALICE DCS Workshop 13 ALICE D etector C ontrol S ystem OK Detector Status Start Stop The basic operations panel for the central ALICE operator

14. André Augustinus 18 March 2002ALICE DCS Workshop 14 Vsby ON OK HV crate Voltage regulator FEE Detector 1 ON Power supply ALICE D etector C ontrol S ystem HV crate LV crate Off Detector 2 Off HV crate LV crate Laser ON Detector 3 HV PS VR FEE Functional behaviour (FSM) Alarm handling Logging & archiving Device driver Database Configuration data Commands & status Operator Commands & status Parent Device Settings & readings Device Unit Functional behaviour (FSM) Alarm handling Logging & archiving Ownership & partitioning Database Configuration data Commands & status Operator Commands & status Parent Child N Control Unit Commands & status Child 1 Commands & status Child 2 Commands & status LV Det 1Det 2 HV LV Det 3 HV LV Cal. DCS Standby OK Standby Off Sect 1 OK RUN Calibrating Not Ready for physics  Propagation of commands and detector status through the DCS system in central operation

15. André Augustinus 18 March 2002ALICE DCS Workshop 15 ALICE D etector C ontrol S ystem Vsby ON OK HV crate Voltage regulator FEE Detector 1 ON Power supply HV crate LV crate Off Detector 2 Off HV crate LV crate Laser ON Detector 3 HV PS VR FEE LV Det 1 Det 2 HV LV Det 3 HV LV Cal. DCS Prepare for physics DCS Prepare for physics LV Switch PS Set VR Ramp HV Load FEE OK LV Det 1 Ramp HV Start LV Load FEE Det 2 Ramp HV Start LV Det 3 Ramp HV Start LV Stop calibr. HV PS VR FEE HV LV HV LV Cal. Ramp HV crate ON OK Voltage regulator FEE ON Power supply HV crate LV crate Ramp ON Ramp HV crate LV crate Laser ON Off ON HV PS VR FEE Ramping OK Ramping OK HV LV Ramping OK Stop HV LV Cal. Preparing for physics DCS ON HV crate ON HV crate ON OK Ramping Det 1 Det 2 Ramping Det 3 Ready Ready for

16. André Augustinus 18 March 2002ALICE DCS Workshop 16 ALICE D etector C ontrol S ystem Concurrent operation:  A detector (expert) operator should have a detailed view of the detector/system be able to run independent from central operation commissioning, debugging, calibration, … be able to give any expert commands  Partitioning

17. André Augustinus 18 March 2002ALICE DCS Workshop 17 Vsby ON OK HV crate Voltage regulator FEE Detector 1 ON Power supply ALICE D etector C ontrol S ystem HV crate LV crate Off Detector 2 Off HV crate LV crate Laser ON Detector 3 HV PS VR FEELV Det 1Det 2 HV LV Det 3 HV LV Cal. DCS Central Operator Detector Expert Request Local Operation Local Operation Granted

18. André Augustinus 18 March 2002ALICE DCS Workshop 18 ALICE D etector C ontrol S ystem More DCS tasks:  Automation Trip recovery Standard procedures  Configuration  Archiving and logging  Interface to external systems

19. André Augustinus 18 March 2002ALICE DCS Workshop 19 ALICE D etector C ontrol S ystem More requirements:  Flexible, scalable and maintainable add new equipment 10-15 years of operation  Reliable operational during shutdown and control of equipment in inaccessible areas

20. André Augustinus 18 March 2002ALICE DCS Workshop 20 Close Parenthesis… )