11

CTP Training

A.Jusko, M. Krivda and R.Lietava.

22

Outlook

• Introduction• Basic Concepts• Control• Configuration• Monitoring

33

LHC Basics

• 2 rings• protons/ions are in bunches• protons’ velocity ~ speed of light• bunches are separated

• 7.5 m in space• 25ns in time = 40 MHz• LHC clock – 40 MHz

• Interaction Point (IP): crossing of rings

• ORBIT• 1 full round ~ 89 microsecs• 3564 bunches

• Bunch Crossing (BC): crossing of two bunches in IP

• LHC filling scheme: • how many bunches are injected• their position in the ORBIT

44

Central Trigger

Processor

LTU

TTC

CTP input

FERORead OutElectronics

Trigger

Electronics

What is trigger?

Detector

DAQ

Detector Data

OFFLINE

Data ESD

Physicists

BUSY LHC clock

55

Basic Concepts

• CTP – Central Trigger Processor• LTU - Local Trigger Unit• DAQ – Data Acquisition system• ECS – Experiment Control System• TTC – Trigger and Timing Control• FERO – Front End Read Out electronics• Global run

– Detector fully in ECS control– CTP provides triggers

• Standalone run– Detector in local control (e.g. testing)

66

CTP control

Central Trigger

Processor

LTU

TTC

CTP input

FERORead OutElectronics

Trigger

Electronics

Detector BUSY LHC clock

Computer programs controls trigger hardware

ltuproxy ctpproxy miclock

ECS

77

CPUs layout in P2

88

Basic Concepts

• Detector:– V0, TPC, SPD

• Trigger Cluster = Group of detectors to be read out togeteher

• CTP Input or Trigger Input:– Fast binary signal from detector 0VBA, 0VBC, 0SMB– Internal CTP or DAQ generators used in technical runs

• Trigger Descriptor = Logical Function of CTP inputs– defines physics to be taken by a class– D0VBA 0VBA– DINT7 0VBA 0VBC 0SMB (logical and of inputs)– L0 function l0fINT1 0VBA | 0VBC | 0SMB

• Trigger Class = Descriptor + Cluster

99

Naming Conventions

• Input names n<3-char code>• n = 0,1,2 (trigger level)

• Descriptor starts with D• Class starts with C

1010

ALLSPD SDD SSD TPC TRD TOF HMPID PHOS MUON_TRK MUON_TRG FMD

T0 V0 ZDC ACORDE EMCal

CTP configuration

ALLNOTRDSPD SDD SSD TPC TOF HMPID

PHOS MUON_TRK MUON_TRG FMD T0 V0ZDC ACORDE EMCal

MUONSPD MUON_TRK MUON_TRG FMD T0 V0l

DINT70VBA & 0VBC

DINT7WU0VBA & 0VBC & 0HWU

DMUS70VBA & 0VBC & 0MSL

DEMC7WU0VBA & 0VBC & 0HWU & 0EMC

DEMC70VBA & 0VBC & 0EMC

DMUSH70VBA & 0VBC & 0MSH

Descriptors Clusters

Class CINT7WU

Class CEMC7WU

Class CINT7

Class CEMC7

Class CMUS7

Class CMUSH7

Classes

1111

• Bunch Crossing mask (BC Mask):– CTP can choose in which bunches in ORBIT to allow triggers

• Downscaling:– CTP can reduce trigger rate of classes with high rate

• Downscale factor DS• Assigning group of classes (CG) time windows

• Calibration trigger:– CTP can send special software triggers used for detector calibration– Fully automatic, but need to be monitored

Configuration II

Trigger Class = Descriptor + Cluster + BCMask + DS + CG

1212

Control Configuration Monitoring• DAQlogbook (monitoring):

– CTP configuration– Input rates– Class rates

• Alice Configuration Tool (ACT) (configuration)• CTP web (monitoring):

– Global Run Busy status– CTP and LTU counters

• InfoBrowser (configuration):• SMAQ• Command line (configuration,monitoring)

1313

DAQlogbook• Accesible from any web bowser:

– alice-logbook.cern.ch/logbook/• Logging any action

– Log your action– Find actions of other people

• Information of every run ever taken in ALICE• Information on current run• Run info

1414

DAQlogbook-Logbook

1515

DAQlogbook-Runs

1616

DAQlogbook-Run Details

1717

DAQlogbook Trigger Info

1818

Class Rates

1919

Configuration

2020

CTP configuration in logbook

2121

Alice Configuration Tool• Accessible from any web bowser:

– alice-logbook.cern.ch/act• Keeps alice configurations

– CTP– Partition

2222

ACT Main

2323

ACT CTP

2424

ACT Partition

2525

Info Browser

• Accessible from CERN general network

• All info messages related to run/detector/system• Most common usage: find the errors during runs

and check if they are related to CTP

Login to computer in CERN general network, e.g. lxplus. Login to daq gateway tools:

ssh –X username@aldaqgw-tools

use your cern password. Start infoBrowser.

2626

Info for run 219799

2727

Info for TRG(CTP) and PHYSICS_1

2828

CTP web and Command line• Trigger oncall account trg@alidcscom707

– Internal alice network. NOT possible to login from outside

– from ARC: Trigger account trg@arc27 ‘sshs’ or ‘ssh –X trg@alidcscom707’ at arc27

– From Outside: login to CERN General network• Login to

– lxplus– cerntsnew.cern.ch

• remotedesktop to alidcswn001• xwin (or putty) to alidcscom707

2929

CTP web

• Web : http://alidcscom835 – BUSY status– CTP/LTU counters– Shifter tasks (to be updated)– Ltuproxy status (to be fixed)

3030

3131

Global Run Busy status/Input ratesBig Screen

3232

CTP counters

3333

CTP counters

3434

LTU status

3535

SsM data AQuisition• Machine alidcscom027

3636

Full ORBIT SMAQ

3737

SMAQ – zoomed plot

3838

Next Step

• Register with DCS for access to alidcsgw001– Contact

• peter.chochula@cern.ch• Cc: roman.lietava@cern.ch

• ACT ?• Daqgw-tools

3939

Class Rates and RatiosBig Screen

4040

CTP Data Quality Monitoring (DQM)

4141

DQM

4242

DQM

4343

LTU proxy status

• Check ltu proxy status• Inform shift leader if

some detector’s proxy not running

4444

Sources

4545

CTP context

Trigger inputs

TRIGGER SUB-DETECTORS

BUSY signals Calibration requests

READOUT SUB-DETECTORS

Control

ECS

Scalers

Scalers

DAQ

List of CTP events Interaction record

Trigger inputs

DAQ (RORC)

Trigger outputs

Trigger inputs

LTU/TTC

CENTRAL TRIGGER PROCESSOR

Figure 3.3 Context diagram of the CTP

4646

CTP Control and Configuration

4747

LHC clock - miclock• ALICE clock change from LOCAL -> BEAM1 during PREPARE RAMP • miclock running at alidcscom188• when started set to mode auto • change to manual ‘man’ if asked by shift leader or expert