Contents

• 1  Introduction
• 2  DAQ Architecture
• 3  DaqDet
• 4  DaqSusp
• 5  DaqMoni
• 6  DaqMain
• 7  Front-End DAQ components
• 8  Back-End DAQ components
• 9  Software Packages used by DAQ
• 10 Related documentation
• 11 List of Acronyms

This documentation is intended for people trained to be DAQ operators.
It describes the Virgo DAQ architecture and the DAQ software components.

This document can be found on the web (lappweb06.in2p3.fr/virgo/daqManual/daqComponents.html).
An other document, the "DAQ Operation Manual" is available in DAQ room, in the yellow folder
called "Interferometer Procedures", and on the web (http://lappweb06.in2p3.fr/virgo/daqManual).

List of acronyms can be found at the end of the document.
 

The Data Acquisition is part of the VIRGO Online System shown below.

It uses synchronization signals and time stamps delivered by the Timing system.

A set of Slow Monitoring Stations (SMS) delivers environment control data sampled
at a low rate (<1 Hz). Those slow monitoring informations are passed to a dedicated
part of the DAQ system: the Slow Frame Builder, which formats them into frames.

The locking, alignment and suspensions control systems include various servo loops and
deliver both detector and auxiliary information sampled at much higher rate.
Those data are collected by readouts units and passed through Digital Optical links (DOL)
to Fast Frame Builders, which formats them into frames.

Any other available data sampled at high rates (up to 20 kHz) are collected and structured
into frames by fast Frame builders.

The Main Frame Builder is used to combine frames received from the various frame builders.

The Data Collection is assumed by 3 DAQ lines running independently with their own
Main Frame Builder (local Main Frame Builder). Each local Main Frame Builder
sends frames to a central Main Frame Builder (FbmMain) which outputs frames
to raw data archiving and online processing tasks.
The 3 DAQ line are the following:

• DaqDet: for Detection Bench
• DaqSusp: for all the control systems (Suspensions, Global Control, Alignment)
• DaqMoni: for Monitoring (vacuum, environment monitoring, Laser/Input Bench/MC)

The Detection Bench DAQ line is in charge of collecting all the data coming out from the
detection bench (camera readout, photodiode readout or Slow Monitoring Stations
dedicated to detection bench).
The table below shows all the servers currently seen by the DaqDet line:

Server       CPU     Crate       Comments

Front-end servers:

Pr27        rio27a   C27   EB - D1,D1p photodiodes readout - 27 channels

Pr28        LAPP           EB - D1,D1p photodiodes readout - 27 channels

Pr29        rio29a   C29   IB,EB - D2,D2p,D5 photodiodes readout - 15 channels

Pr70        rio70a   C70   NE - D7 photodiodes readout

Pr80        rio80a   C80   WE - D8 photodiodes readout

Pi25        rio25a   C25   Picomotors control on Output Bench

Mc25        rio25a   C25   Output Mode Cleaner Control

Fast Frame Builders:

Fbf16a      rio16a  C16    Data from Pr27, Pr28

Slow Frame Builder:

FbsDet      alpha   fbl3   Data from Vb25, Sr25, Lo25

Main Frame Builder:

FbmDet      alpha   fbl3   Data from Fbf16a, FbsDet, Pi25, Mc25

FbmDetCsm1  alpha   fbl3   Consumer (send frames to FbmMain)

FbmDetShift alpha   fbl3   Consumer (send frames to operator on shift)

FbmDetUsers alpha   fbl3   Consumer (send frames to any online user)

The Suspensions, Alignment and Global Control DAQ Line is in charge of collecting all
the data coming out the various Suspensions and interferometer alignment and control systems.
The table below shows all the servers currently seen by the DaqSusp line:

Server       CPU     Crate       Comments

Front-end servers:

GxSrio40B:IB  rio40b  C40  Input Bench Suspension Gx Server (camera readout)

GxSrio42B:IB  rio42b  C42  Power Recycling Suspension Gx Server

GxSrio44B:IB  rio44b  C44  Beam Splitter Suspension Gx Server

GxSrio46B:IB  rio46b  C46  West Input Suspension Gx Server

GxSrio48B:IB  rio48b  C48  North Input Suspension Gx Server

GxSrio50B:IB  rio50b  C50  Output Bench Suspension Gx Server

GxSrio25B:IB  rio25b  C25  End Bench Gx Server

GxSrio72B:IB  rio72b  C72  North end Bench Gx Server

GxSrio82B:IB  rio82b  C82  West end Bench Gx Server

Fast Frame Builders:

Fbf17a        rio17a  C17    Data from suspensions IB, PR, BS, WI, NI, OB

Slow Frame Builder:

FbsSusp       alpha   fbl2   Data from Suspensions LVDT, towers temperatures

Main Frame Builder:

FbmSusp       alpha   fbl2   Data from Fbf17a, Gx's, FbsSusp

FbmSuspCsm1   alpha   fbl2   Consumer (send frames to FbmMain)

FbmSuspShift  alpha   fbl2   Consumer (send frames to operator on shift)

FbmSuspUsers  alpha   fbl2   Consumer (send frames to any online user)

The Monitoring DAQ line is in charge of taking environment data from various
monitoring tasks (microphones, accelerometers, EM probes, signals from IB/Laser/MC)
in the Central Building and in the Mode Cleaner Building
The table below shows all the servers currently seen by the DaqMoni line:

Server       CPU     Crate       Comments

Fast Frame Builders:

Fbf39        rio39a  C17    Central Building environment monitoring, IB/Laser/MC signals

Fbf61        rio61a  C14    MC building environment monitoring

Slow Frame Builder:

FbsMoni       alpha   fbl1   Data from vacuum, LaDiode(laser), building temperatures

Main Frame Builder:

FbmMoni       alpha   fbl1   Data from Fbf39, Fbf61, FbsMoni

FbmMoniCsm1   alpha   fbl1   Consumer  (send frames to FbmMain)

FbmMoniShift  alpha   fbl1   Consumer  (send frames to operator on shift)

FbmMoniUsers  alpha   fbl1   Consumer  (send frames to any online user)

DaqMain is the main stage of the Data Acquisition system. It controls the central Main Frame Builder
(FbmMain) and the Master Timing Server which is necessary to run the overall system.
The table below shows all the servers currently seen by DaqMain:

Server       CPU     Crate       Comments

Master Timing:

TiServer     rio11a  C11   Master Timing Server (providing GPS time and run#)

(seen in fact by FbmSusp, FbmDet and FbmMoni)

Sources of Frames:

FbmDetCsm1   alpha   fbl3  Consumer (send frames to FbmMain)

FbmSuspCsm1  alpha   fbl2  Consumer (send frames to FbmMain)

FbmMoniCsm1  alpha   fbl1  Consumer (send frames to FbmMain)

Main Frame Builder:

FbmMain         alpha   fbm   Data from FbmDetCsm1, FbmSuspCsm1, FbmMoniCsm1

FbmMainCsm1     alpha   fbm   Consumer  (send frames to fdwrite_proc)

FbmMainShift    alpha   fbm   Consumer  (send frames to operator on shift)

FbmMainUsers    alpha   fbm   Consumer (send frames to any online user)

FbmMainWrite    alpha   fbm   Consumer (send frames to non permanent data storage (scratch disk of ax9))

FbmMainDisk     alpha   fbm   Consumer (send frames to large data storage)

FbmMainTrend    alpha   fbm   Consumer (send frames to Trend Frame Builder)

FbmMainTrend50  alpha   fbm   Consumer (send frames to 50Hz Trend Frame Builder)

FbmMainOP       alpha   fbm   Consumer (send frames to first Online Processing task)

They all run on RIO806X CPUs under LynxOS real-time system. Configuration files are
currently stored in /virgoData/Fbf-Pr-GxS-TiM and will be stored in the data base Db
in normal running conditions.

Master Timing Server : TiM

It manages the basic properties of the timing signals used over the Virgo online systems.
It is made of 2 parts:

- The generator & distributor part uses a fast clock provided by GPS board (5 MHz).
    It generates and distributes the 4 hardwired signals (fast clock, sampling, frame, run)
    and reads each frame's starting time (GPS time).

- The monitor & control part checks the sampling signal propagation and measures the
    round trip time along the distribution system.

Hardware components : 1 CPU, 1 Timing board, 1 GPS board, 4 TTL/OPT boards,

                                      + 8 OPT/TTL boards, 5 Timing boards, 1 GPS board

Delivered signals : Fast clock: 2.5 MHz (if GPS used) 2 MHz (if no GPS),

                             Sampling: 20KHz,  Frame: 1Hz

Software description :  starts the main Timing board, reads GPS board,

                                    sends timing information to servers, sends GPS time and

                                    run number to slow frame builders and main frame builders.

Hardware components : 1 CPU, 1 Timing board, up to 5 Camera boards

Running conditions : Used also within suspension's crate. Camera IRQ frequency: 50Hz

Software description :

    -Front end server and User's timing

    -Used for Camera readout (alignment or local controls)

    -Write timing information in suspensions DSP memory through VME bus.

    -Calculate position using fine, coarse or telemeter algorithm.

    - Send calculated positions to DSP through VME bus

    - Build and send frames

They all run on Alpha XP1000 workstations under OSF1 v5.0 Unix operating system.
Configuration files are currently stored in /virgoData/Fbs-Fbm and will be stored
in the data base Db in normal running conditions.

Main Frame Builder : Fbm  and  FdCsm

The Fbm component is used to collect and merge frames provided by frames sources
(merging based on frame number). It uses a shared memory mechanism and,
 two sotfware processes:

     - Producer: merge frames coming from fast frame builders and slow frame
                        builders and put them in a shared memory. Only one producer
                        manages one shared memory. It receives also frame's header
                        informations (GPS time, run number, etc...) from the Master Timing.
                             (/virgoApp/Fbm/vXrY/OSF1/Fbm)

     - Consumer: read frames in shared memory and send them on Ethernet network.
                         Several consumers can read the same shared memory.
                               (/virgoApp/Fd/vXrY/OSF1/FdCsm)
 

Hardware components: fbl1, fbl2, fbl3, fbm Alpha workstations with Gigabit interfaces.

Slow Frame Builder : Fbs

The Fbs component requests slow monitoring data to the various
Slow Monitoring Stations (SMS), collects them as characters strings
and to format them into frame. Data requests to SMS are timed by interrupts
from the Master Timing (Cm messages) and are done at a maximal
rate of 1 Hz (frame frequency).
 
Hardware components: fbl1, fbl2, fbl3 Alpha workstations.

The Data Acquisition System requires the following software packages:

Basic packages:

 /virgoApp/Fr     Frame Library

 /virgoApp/Cfg    Config parser and more...

 /virgoApp/CSet

 /virgoApp/Cm     Multipurpose Communication Machine (use CSet)

 /virgoDev/Fd     Frame distribution library and utilities (use CSet, Cm, Cfg, Db, El, Su)

 /virgoDev/Vx     VME interface fot LynXOS real time

 /virgoApp/Ti     Timing Library  (use Vx)

 /virgoApp/Do     Digital Optical Link Library

 /virgoApp/Adc298 Adc298 (16 channels) library

 /virgoApp/TiM    Master Timing (use Vx, Ti, Cfg, CSet, Cm, Fr, Fd, Db, El, Su)

 /virgoDev/GxS    Camera readout (use Vx, Ti, TiM, Cfg, CSet, Cm, Fr, Fd, Db, El, Su)

 /virgoDev/Pr     Photodiodes Readout (use Vx, Ti, TiM, Do, Cfg, Fbf, Fd)

 /virgoDev/Fbf    Fast Frame Builder (use Vx, Ti, TiM, Do, Cfg, CSet, Cm, Fr, Fd, Db, El, Su, Adc298)

 /virgoDev/Fbs    Slow Frame Builder (use Cfg, Fr, Fd, CSet, Cm, Db)

 /virgoDev/Fbm    Main Frame Builder (use Cfg, Fr, Fd, CSet, Cm, Db, El, Su)

• VIR-MAN-LAP-5400-110 : Data Acquisition : Schemes, Signals and Frames
• Last documentations about Fd and Fr: /virgoApp/Fd/v3r10/doc   and   /virgoApp/Fr/v4r43/doc
• VIR-MAN-LAP-5400-114:  Signal names list

• ADC: Analogic to Digital Converter
• BS: Beam Splitter suspension
• CPU: Central Processing Unit (processor used)
• DAQ: Data acquisition
• DaqDet : DAQ line dedicated to the Detection Bench
• DaqMoni : DAQ line dedicated to the Monitoring information
• DaqSusp : DAQ line dedicated to the Suspensions, Alignment and Global control systems
• OB: Output Bench (detection)
• EB: End Bench (detection)
• DOL: Digital Optical Link
• Fbm : Main Frame Builder
• Fbs : Slow Frame Builder
• Fbf : Fast Frame Builder
• GC : Global Control
• GPS : Global Positioning System
• GxS : Galaxy Server (camera readout)
• IB: Input Bench
• NB: North Bench (at the end of north arm)
• NI: North Input suspension
• Pr : Photodiodes Readout
• PR: Power Recycling suspension
• Qr : QuadrantPhotodiodes Readout
• SMS : Slow Monitoring Station
• WB: West Bench (at the end of west arm)
• WI: West Input suspension