First of all you need an account on the system. The Project leader is Matthias Hoeft and the Project ID is HTB00 (needed for registration). The following website contains all necessary links for allocating computing time in the Jülich Supercomputing Centre (JSC). Click on the link “User Accounts for projects on JUQUEEN, JURECA,…” and follow the instructions.
http://www.fz-juelich.de/ias/jsc/EN/Expertise/Services/JSConline/ComputingTime/_node.html
german version:
http://www.fz-juelich.de/ias/jsc/DE/Leistungen/Dienstleistungen/JSCOnline/Rechenzeitvergabe/_node.html
Get in contact with Matthias so he can sign your account application and initiate the next steps.

Take a look at this site on how to get the data from the LTA
http://www.lofar.org/operations/doku.php?id=public:lta_howto
To download data from the web you need the full filename. You can look those up in the catalog
http://lofar.target.rug.nl/Lofar
The Juelich Http download server is here
https://lofar-download.fz-juelich.de/
For Sara
https://lofar-download.grid.sara.nl/

The recommended way to copy data is via srm copy. For doing this you need a Grid Certificate and to Register in the Virtual Organization (VO) as a Lofar User.

You can register with the Lofar VO here: https://voms.grid.sara.nl:8443/voms/lofar

To get direct srm copy access to the LTA storage you need a Grid Certificate.
Its best to ask around in your institute where to get and how to install such a certificate. General information about german grid certificates can be found here:
http://dgi-2.d-grid.de/zertifikate.php

Using Jureca for LOFAR processing

Account

Acquiring Data

Register with the Virtual Organization

Grid Certificate

LOFAR Wiki