[Olympus] SlowControl

[Douglas Kenneth Hasell]

Hi,

	I think it is difficult to specify exactly what needs to be readout and stored via slow control now.  It change with time and as we develop the experiment but I will give a list below.

	The important items to agree on now are:

	1. Slow control data must be in the data acquisition.  Maybe it doesn't all have to be stored though it may as well be.  Maybe it can be compressed to remove quantities which haven't changed since previous record. Frequency should be agreed upon (once every 10 seconds perhaps).

	2. Slow control data should also be stored separately.  There should be tools for analysing the SC data.

	3. Since I don't think Anton will be responsible for hardware (i.e. temperature sensors, etc.) each group must say how the data will be provided to Anton.  For example the wire chamber gas system pressures, temperatures, flows, valve settings, etc. will be available through EPICS.  I assume that Anton will then interface the various systems with his system (perhaps based on what is below he might choose EPICS).

	4. Reading and storing the data is one thing.  Control is another.  Will slow control have an interface for controlling things like the high voltage, low voltage, wire chamber gas system, target gas system, etc. or is this responsibility elsewhere.

	5. Slow control must interface with the data acquisition and the operators.  High voltage trips must inhibit data acquisition immediately.  Alarms and warnings must also be presented to the operators for action.

	6. The will be numerous scalers and other rates or settings such as pre-scale factors, trigger rates, etc.  which must be in the data acquisition chain.  Possibly some of these can also be recorded periodically to SC.

	7. Slow control must interface with the DORIS operation.  We must say when the detectors are in a safe state.  DORIS must tell us when we can switch on.  Similarly the vacuum system in OLYMPUS must exchange information with the DORIS vacuum system to control valves to ring.

	8. Slow control should not be responsible for data quality.  The data acquisition system should provide a mechanism for sampling the data and the various groups should form histograms which the operators can check to ensure the detector is working properly.

	I am sure there are things I have forgotten but maybe this will serve as a starting point for discussions at the meeting.

	Now for a list of things for slow control:

Target gas system: - interface EPICS
	- 15 valves
	- 6 pressures
	- 4 temperatures
	- 2 mass flow controllers
	- 2 pumps

Wire chamber gas system: - interface EPICS
	- 4 valves
	- 12 pressures
	- 8 temperatures
	- 2 mass flow controllers

Gem Tracker gas system: - interface EPICS
	- probably uses the same system as wire chamber
	- possibly some extra valves

Lumi Monitor gas system: - interface EPICS
	- probably uses the same system as wire chamber
	- possibly some extra valves

MWPC gas system: - interface ?
	- ?

High voltage: - interface Lecroy main frames or EPICS
	- voltage of each
	- currents of each 
	- 198 for wire chamber
	- 68 for time of flight
	- 4 for Gem tracker
	- 6 for luminosity monitor
	- 18 for symmetric Moller detector
	- MWPC ?

Low voltage: - interface EPICS
	- voltage
	- current
	- 66 for wire chamber
	- 4 for Gem tracker
	- 6 for luminosity monitor

Vacuum system: - interface EPICS
	- 8 pressures
	- 8 valves
	- 6 pumps

Magnet: - interface main power supply and EPICS
	- main power supply voltage and current
	- 12 water flow meters
	- 12 temperatures
	- 8 Hall probes
	- 8 trim coil voltages and currents

DORIS: (from Frank's message) - NextMex ?
	- 11 currents
	- lifetime
	- 16 positions
	- 6 scrapper positions
	- 8 corrector currents
	- 1 cavity voltage


                                                    Cheers,
                                                            Douglas

26-415 M.I.T.                                 Tel: +1 (617) 258-7199
77 Massachusetts Avenue                       Fax: +1 (617) 258-5440
Cambridge, MA 02139, USA                      E-mail: hasell at mit.edu           



On Apr 13, 2010, at 11:43 AM, Anton Izotov wrote:

> Dear friends,
> 
> looks it's time to collect some info for future. Not far future, BTW.
> We all need a SlowControl (SC) data. And we want it as ... as possible. 
> Taking into account that our project seems to pretend to be very precise 
> one we are much dependent on SC data. It is reality.
> 
> I would like to know your oppinion. What would you like to store 
> (see on your monitors, monitor, control) about your own beloved detector?
> I mean ADC channels number needed as well.
> 
> Responsibles! I'm calling to you. 
> 
> The sooner you answer the sooner it works.
> 
> My best...
> 
> Anton
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