István Márton

WS-PGRADE/gUSE Generic DCI Gateway Framework for a Large Variety of User Communities

The WS-PGRADE/gUSE generic DCI gateway framework has been developed to support a large variety of user communities. It provides a generic purpose, workflow-oriented graphical user interface to create and run workflows on various DCIs including clusters, Grids, desktop Grids and clouds. The framework can be used by NGIs to support small user communities who cannot afford to develop their own customized science gateway. The WS-PGRADE/gUSE framework also provides two API interfaces (Application Specific Module API and Remote API) to create application-specific science gateways according to the needs of different user communities. The paper describes in detail the workflow concept of WS-PGRADE, the DCI Bridge service that enables access to most of the popular European DCIs and the Application Specific Module and Remote API concepts to generate application-specific science gateways.

Ultrafast strong-field photoemission from plasmonic nanoparticles.

We demonstrate strong-field photoemission from plasmonic nanoparticles by ultrashort pulses. Significant (x110) field enhancement attributed to surface plasmons enable 25-eV electron generation in nano-localized fields around nanoparticles. Correlation between plasmonic resonance and electron spectra is shown.

DCI Bridge: Executing WS-PGRADE Workflows in Distributed Computing Infrastructures

Solving distributed computing infrastructure (DCI) incompatibility issues in a generic way is a challenging and complex task. Gateways and workflow management systems are often tightly bound to some limited number of supported DCIs. To enable gateways access to many different DCIs and to solve DCI compatibility among the very different workflow management systems, we have developed a generic solution, the DCI Bridge. In this chapter we describe its internal architecture, provide usage scenario and show how the DCI Bridge resolves interoperability issues between various middleware-based DCIs. We also provide insight about the capabilities of the realized system. The generic DCI Bridge service seamlessly enables the execution of workflows (and jobs) on major DCI platforms such as ARC, Globus, gLite, UNICORE, SGE, PBS, as well as web services or clouds.

ENABLING GENERIC DISTRIBUTED COMPUTING INFRASTRUCTURE COMPATIBILITY FOR WORKFLOW MANAGEMENT SYSTEMS

Solving workflow management system’s Distributed Computing Infrastructure (DCI) incompatibility and their workflow interoperability issues are very challenging and complex tasks. Workflow management systems (and therefore their workflows, workflow developers and also their end-users) are bounded tightly to some limited number of supported DCIs, and efforts required to allow additional DCI support. In this paper we are specifying a concept how to enable generic DCI compatibility for grid workflow management systems (such as ASKALON, MOTEUR, gUSE/WS-PGRADE, etc.) on job and indirectly on workflow level. To enable DCI compatibility among the different workflow management systems we have developed the DCI Bridge software solution. In this paper we will describe its internal architecture, provide usage scenarios to show how the developed service resolve the DCI interoperability issues between various middleware types. The generic DCI Bridge service enables the execution of jobs onto the existing major DCI platforms (such as Service Grids (Globus Toolkit 2 and 4, gLite, ARC, UNICORE), Desktop Grids, Web services, or even cloud based DCIs).

Few-cycle plasmon oscillations controlling photoemission from metal nanoparticles

Péter Földi, István Márton, 3 Nikolett Német, and Péter Dombi 2 Department of Theoretical Physics, University of Szeged, Tisza Lajos körút 84, H-6720 Szeged, Hungary∗ Wigner Research Center for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary Department of Experimental Physics, University of Pécs, Ifjuság útja 6, H-7624 Pécs, Hungary Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, GermanyFew-cycle optical excitation of nanosystems holds promise of fundamental discoveries and applications in ultrafast nanoscience, the development of nanostructured photocathodes, and many more. For these, surface plasmon generation on unprecedented timescales needs to be controlled. For this, few-cycle plasmon oscillations on a metal nanoparticle can be generated by keeping considerable electric field enhancement factors. As an initial application of such a high spatiotemporal localization of an ultrashort laser pulse, we numerically demonstrate the control of photoelectrons on a true sub-fs timescale in nanometric spatial domains. We show that it is only off-resonant nanoparticles that can provide few-cycle plasmons and electron control on this timescale.

Remote storage management in science gateways via data bridging

State‐of‐the‐art science gateways can be connected to several distributed computing infrastructures (DCIs) and are able to run jobs and workflows simultaneously in all those DCIs. Flexibility of accessing diverse data storages from these workflows and assisting end users to manage these storages are however the missing features in current gateway implementations, in which these problems often prove to be a barrier of exploiting the power of distributed computing by user communities having no or little IT competence. This paper addresses these issues by integrating a data bridging service called Data Avenue into WS‐PGRADE/gUSE portal framework. Data Avenue offers tools for the end users to easily manage their data residing on various storage resources, and also, jobs become capable of accessing different storages regardless of the particular distributed computing infrastructure where the job is currently being run. Copyright

Measurement of nanoplasmonic field enhancement with ultrafast photoemission

Plasmonic enhancement of optical near-fields at nanostructures provides for localization of the energy of light on the nanoscale. This phenomenon allowed pioneering applications in spectroscopy, photovoltaics and sensorics. It remains a challenge to measure the extent of the maximum achievable nanoplasmonic field enhancement for a particular sample. Even though near-field probing methods such as scanning near-field optical microscopy (SNOM) can reach a resolution down to 8–10 nm, probing near-fields on ∼1 nm scale needs a different approach. Here, we demonstrate a method for nanoplasmonic near-field measurement with the help of photoemitted electrons induced by femtosecond laser pulses.

Pre-excitation studies for rubidium-plasma generation

The key element in the Proton-Driven-Plasma-Wake-Field-Accelerator (PWFA) project is the generation of highly uniform plasma from Rubidium vapor. A scientifically straightforward, yet highly challenging way to achieve full ionization is to use high power laser which can assure the barrier suppression ionization (BSI) along the 10 m long active region. The Wigner-team in Budapest is investigating an alternative way of uniform plasma generation. The proposed Resonance Enhanced Multi-Photon Ionization (REMPI) scheme can be probably realized by much less laser power. In the following we plan to investigate the resonant pre-excitations of the Rb atoms, both theoretically and experimentally. In the following our theoretical framework is presented together with the status report about the preparatory work of the planned experiment.

Data Migration for Large Scientific Datasets in Clouds

1Institute for Computer Science and Control, Hungarian Academy of Sciences (MTA SZTAKI), Budapest, Hungary, akos.hajnal@sztaki.mta.hu, eniko.nagy@sztaki.mta.hu, peter.kacsuk@sztaki.mta.hu *Correspondence: Peter Kacsuk, nstitute for Computer Science and Control, Hungarian Academy of Sciences (MTA SZTAKI), Budapest, Hungary, peter.kacsuk@ sztaki.mta.hu Abstract Transferring large data files between various storages including cloud storages is an important task both for academic and commercial users. This should be done in an efficient and secure way. The paper describes Data Avenue that fulfills all these conditions. Data Avenue can efficiently transfer large files even in the range of TerraBytes among storages having very different access protocols (Amazon S3, OpenStack Swift, SFTP, SRM, iRODS, etc.). It can be used in personal, organizational and public deployment with all the security mechanisms required for these usage configurations. Data Avenue can be used by a GUI as well as by a REST API. The papers describes in detail all these features and usage modes of Data Avenue and also provides performance measurement results proving the efficiency of the tool that can be accessed and used via several public web pages.

Ultrafast Plasmonic Electron Emission from Ag Nanolayers with Different Roughness

We demonstrate ultrafast plasmonic electron emission and acceleration from Ag nanolayers having different roughness. We obtained the spectrum of the electrons and found that the surface roughness deeply influences the properties of the electron spectra. Numerical simulations on propagating surface plasmons coupled to localized plasmons on surface grains support the observations. Applications related to ultrafast electron sources and ultrafast photocathodes are envisaged.