AIDA-2020 Deliverable - AIDA-2020 Consortium, 2017 Grant Agreement 654168 PUBLIC 1 / 9 Grant Agreement No: 654168 AIDA-2020 Advanced European Infrastructures for Detectors at Accelerators

AIDA-2020-D5.5

AIDA-2020 Advanced European Infrastructures for Detectors at Accelerators

Deliverable Report

Online data model available

Irles, A. (CNRS-LAL, DESY) et al

30 November 2017

The AIDA-2020 Advanced European Infrastructures for Detectors at Accelerators project has received funding from the European Union’s Horizon 2020 Research and Innovation

programme under Grant Agreement no. 654168.

This work is part of AIDA-2020 Work Package 5: Data acquisition system for beam tests.

The electronic version of this AIDA-2020 Publication is available via the AIDA-2020 web site or on the CERN Document Server at the following URL:

Copyright c© CERN for the benefit of the AIDA-2020 Consortium

http://aida2020.web.cern.ch http://cds.cern.ch/search?p=AIDA-2020-D5.5

AIDA-2020 Consortium, 2017

Grant Agreement 654168 PUBLIC 1 / 9

Grant Agreement No: 654168

AIDA-2020 Advanced European Infrastructures for Detectors at Accelerators

Hor izon 2020 Research In f rast ructures pro ject AIDA -2020

DELIVERABLE REPORT

ONLINE DATA MODEL AVAILABLE

DELIVERABLE: D5.5

Document identifier: AIDA-2020-D5.5

Due date of milestone: End of Month 30 (October 2017)

Report release date: 30/11/2017

Work package: WP5: Data acquisition system for beam tests

Lead beneficiary: DESY

Document status: Final

Abstract:

This document summarizes the event model definition and a test thereof for common data acquisition

(DAQ) and data quality monitoring (DQM).

ONLINE DATA MODEL AVAILABLE Deliverable: D5.5

Date: 30/11/2017

Grant Agreement 654168 PUBLIC 2 / 9

AIDA-2020 Consortium, 2017

For more information on AIDA-2020, its partners and contributors please see www.cern.ch/AIDA2020

The Advanced European Infrastructures for Detectors at Accelerators (AIDA-2020) project has received funding from the

European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement no. 654168. AIDA-2020

began in May 2015 and will run for 4 years.

Delivery Slip

Name Partner Date

Authored by A. Irles

R. Ete

LAL/DESY

DESY 13/11/2017

Edited by L. Lapadatescu CERN 13/11/2017

Reviewed by M. Wing [WP5 coordinator]

F. Sefkow [Scientific coordinator]

UCL

DESY 24/11/2017

Approved by F. Sefkow [Scientific coordinator]

Steering Committee

30/11/2017

http://aida2020.web.cern.ch/

ONLINE DATA MODEL AVAILABLE Deliverable: D5.5

Date: 30/11/2017

Grant Agreement 654168 PUBLIC 3 / 9

TABLE OF CONTENTS

1. Introduction ...................................................................................................................................... 4

2. Online EUDAQ event model ........................................................................................................... 4

3. Event model for online data quality monitoring .............................................................................. 5

4. Event model for common beam tests ............................................................................................... 6

5. Proof of concept ............................................................................................................................... 7

6. References ........................................................................................................................................ 8

Annex: Glossary ................................................................................................................................... 9

ONLINE DATA MODEL AVAILABLE Deliverable: D5.5

Date: 30/11/2017

Grant Agreement 654168 PUBLIC 4 / 9

Executive summary

In this document, we report on the online model definition succesfully tested in a set of combined

beam tests of a beam telescope and the analogue hadronic calorimeter technological prototype for

the linear collider.

Sections 2 and 3 are dedicated to the event model implementation for the online event synchronization

using EUDAQ 2 software and for quality monitoring using the DQM4HEP online monitor framework.

In Section 4 we present an event model general case implementation of common test beam within

AIDA2020 WP5 standards.

Finally, in Section 5, we refer to the success of the event model for common beam tests in a real case

example: the combined beam test of the beam telescope and the analogue hadronic calorimeter at the

DESY beam line.

1. INTRODUCTION

This deliverable document is largely based in the AIDA2020-MS47 document [1] where we report

on the online model definition, development and test in a set of combined beam tests of a beam

telescope and the analogue hadronic calorimeter technological prototype for the linear collider. In the

milestone document, we discussed the work of WP5 task 5.5 in the pursuit of the definition of the

event model. The first part of the document was dedicated to a summary report of the status of

EUDAQ 2 [2] which is the data acquisition framework used and developed by WP5 and for combined

beam tests of linear collider detectors. We referred to online documentation and other WP5 milestones

reports. The second part, and the core of the document, was dedicated to the event model definition

inside EUDAQ 2, its most important features and its implementation for the online data quality

monitoring and the fostered synergies with the DQM4HEP online monitor framework. Finally, we

presented and discussed the proof of concept case: the combined beam test of the beam telescope and

the analogue hadronic calorimeter at the DESY beam line.

In this deliverable document, we will basically highlight the main ideas and facts described in the

AIDA2020-MS47.

2. ONLINE EUDAQ EVENT MODEL

The event model is based in the eudaq::Event class: the most important data container in the EUDAQ

system (we refer to the AIDA-2020-MS47 document and to the EUDAQ manual for more detailed

information). Data acquired by the devices are saved as an eudaq::Event in the Producer (detector

specific software modules for hardware control and data acquisition) with an associated m_type, see

Table 1, used afterwards in the DataCollector as identifier for data conversion if needed and a variable

that allows identification of the acquisition time to which it belongs, making possible the merging in

the DataCollector with other events collected by other Producers. These identifiers can be a trigger

ID provided by an external device, an internal or external timestamp, an internal event number counter

or any combination of them. It is at this level, DataCollector (generic EUDAQ 2 module where the

data from different Producers is merged) level, where the real events containing information of all (or

a few) of the devices in the beam test are built.

ONLINE DATA MODEL AVAILABLE Deliverable: D5.5

Date: 30/11/2017

Grant Agreement 654168 PUBLIC 5 / 9

In addition, the eudaq:Event m_blocks variable allows the data to be stored in any kind of format.

Here is where the different Producers should keep the full event information (collected charge for all

channels, digital signals, etc.) and does not need to be, in principle, decoded in any way to be sent to

the DataCollector as long as this information is not needed for the basic event building.

Table 1: All member variables in eudaq::Event

 eudaq::LCEvent

This is an EUDAQ wrapper for the LCIO [3] container. This is a derived class from eudaq::Event

which facilitates the online conversion to LCIO during the event merging at the DataCollector level.

Although this and eudaq::Event have been developed in the context of Linear Collider and telescope

experiments (which use LCIO objects for event definition), this object is general enough to be used

for all kind of detectors as long as they want to use LCIO format for their analysis/monitoring

offline/online tools.

3. EVENT MODEL FOR ONLINE DATA QUALITY MONITORING

During discussions with several groups about the online data quality monitoring approach for

common beam tests, WP5 has established a strong collaboration with DQM4HEP [4] developers. It

is designed for use as a generic online monitor for particle physics experiments, ranging from small

table-top experiments to large multi-detector test-beams set-ups, such as those currently

ongoing/planned at the DESY2 or CERN SPS beamlines. It has been used successfully by several

groups and detectors: i.e. telescopes and CALICE AHCAL and SDHCAL.

The software provides, among others features, a DAQ system entry point to feed the system with raw

data, a raw data distributed system using the server/client paradigm and a histogram distributed

system and visualization interfaces.

It is designed to accept any C++ serialized object as a raw event but AIDA-2020 WP5 advises to use

LCIO objects, since

- they are flexible and we also benefit from t