The HLT Piquet Guide First Steps

This page tries to help prepare you for your first HLT piquet shift. Some of the steps listed should be followed before the first shift.

General Information

Your main starting point for information about the duties of an HLT piquet, what parts of the system to pay attention to and possible solutions to problems can be found in HltPiquetGuide and HltPiquetRunningHLT2. For further information about many systems refer to the shift leader training here

Your main job is threefold. Firstly to check that Hlt1 and Hlt2 are running as expected. Secondly, to deal with any problems that come up either by yourself of calling an expert. Thirdly, to communicate effectively with the shift leader, the experts and everyone else involved. The third involves being reachable via the HLT piquet phone at any time, giving a status update at run meetings, and attending HLT operations meeting on the Friday before and during the shift. Please arrange to pick up the phone from the previous shifter. Often this is done at the Tuesday run meeting. Before your shift create an access request and sign up to a few mailing lists and the "online account", which can take a few days to activate.

Access Request

You will probably want to spent at least some time at the pit in the LHC control room. In that case you need to create an request access to "3862-R-001" and "LHCB_S" on EDH.

Mailing Lists

Before starting the shift you should be signed up to the following LHCb mailing lists. For lhcb-hlt-piquet you have to be manually added by one of the experts (e.g. Conor Fritzpatrick). For the others navigate to Find the mailing list, navigate to the Members tab and click on "add me". Check to see if you are signed up by navigating to the "Email Addresses" tab. If you see the other members, you are signed up.

  • lhcb-hlt-piquet (Added by experts)
  • lhcb-hlt-operations
  • lhcb-run-news
  • lhcb-online-users

Online Account


In order to view and manipulate online running conditions, you need an LHCb Online Account. Email asking for it and provide your first and last name, NICE account name and lhcb group. Once activated reset your password. Approval of the account takes a day or so.

Running the UIs

Now you can get access to all the controls and monitoring histograms from your personal computer, so you don't have to be at the pit 24/7. You can set up the connection by following the instructions for UNIX ( Linux or MacOS) or for Windows.

In practice, you first have to be in the CERN environment (either physically at CERN or you ssh into lxplus first), ssh into the gateway (lbgw) and from there ssh can reach the final nodes. The final node "ui" has scripts to launch the controls interfaces, e.g. /group/online/ecs/Shortcuts315/LHCb/ECS/ , and the presenter in /group/online/presenter/presenter. Another final node is "plus".

The current state of the LHC can be seen in the Vistar and for error loggers execute "errorLog LHCb" or "errorLog LHCb2" from the final node. The locations of the history file is "/clusterlogs/partitions/LHCb2/daq/LHCb2.log" and "/clusterlogs/partitions/LHCb/daq/LHCb.log" for HLT1 and HLT2, respectively. These files can be opened by your favourite text editor.

In case the online account won't be approved before your first day of shifts, you can give your public ssh key to an expert (e.g. Rosen Matev) and they can give you access directly from your computer.

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Topic revision: r6 - 2018-11-02 - ConstantinWeisser1
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