Controlling Detectors at the Neutrino Platform

The Detector Control System allows to monitor and control the detectors installed at the Neutrino Platform. The DCS user interfaces can be launched in the NP02 and NP04 control rooms from two dedicated workstations. For a few super-experts remote control is possible using a special cern terminal server (see below). If you only want to monitor the status of the cryostats or detectors it is better to use the dedicated web interfaces.

Access Control System

The DCS acts on power supplies and other actuators: it is thus possible to harm the system (and even people) if not used with care. Therefore, an access control system is put in place in order to allow only qualified people to perform certain actions. There are three levels of permissions: observer, operator, expert. You will always log in with your personal cern user account which is associated via e-groups to a set of rights.

Observer

There is no need to login, only monitoring is allowed and no actions are enabled.

Operator

The operator can turn on/off equipment and perform a controlled set of actions predefined by the system experts. In order to be an operator you have to apply to the relevant egroups and get approval:
  • NP02 and VD cold-box: np02-dcs-operator
  • NP04 and HD coldbox: np04-dcs-operator

It is mandatory to be inside EHN1 and to make sure that carrying out any action is safe before taking any initiative! In particular, do not turn on any power supply without being absolutely sure that nobody is working on it and that it is safe for the equipment to do so!

Expert

The expert can perform the actions of an operator and in addition can modify the settings of equipment (e.g. the nominal voltage value to a channel of a power supply, the ramping profile, ... Experts are the ones that define the set of actions that can be delegated to operators. In order to be an expert you have to apply to the relevant egroups and get approval:
  • NP02 and VD cold-box: np02-dcs-expert
  • NP04 and HD coldbox: np04-dcs-expert

It is mandatory to be inside EHN1 and to make sure that carrying out any action is safe before taking any initiative! In particular, do not turn on any power supply without being absolutely sure that nobody is working on it and that it is safe for the equipment to do so!

Monitoring the NP remotely

For monitoring purposes there is a web application showing most of the DCS parameters. This is the preferred and most scalable way of looking at the system for all collaborators:

Remote Access to DCS

For very few super-experts it is possible to connect to the DCS system remotely, via a dedicated CERN terminal server (cerntsice). In order to get permission to act remotely you have to subscribe to the group np-dcs-remote and get approval. Note that you will have the same rights defined by your access control permissions. Also note that the same rules apply before taking any action: you must be sure that it is safe to do so and normally should only take actions on request from someone who is in EHN1.

Since this permission is very special and should really be dealt with care, dedicated instructions to obtain the bat file to launch the UI for your specific project shall be requested to Xavier Pons or Patricia Mendez.

E-group owners

E-group owners are responsible for approving requests. if you have any doubt rather get back to the requestor and ask for more information. It is not a matter of being unpolite, but of delegating power responsibly.

-- GiovannaLehmannMiotto - 2021-11-11

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Topic revision: r1 - 2021-11-11 - GiovannaLehmannMiotto
 
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