Abstracts Brochure - CERN

THPCH125
THPCH126
THPCH127
29-Jun-06 16:00 - 18:00 THPCH — Poster Session
Inter-laboratory Synchronization for the CNGS Project
CERN will start sending a neutrino beam to
J. Serrano, P. Alvarez, J. Lewis (CERN)
Gran Sasso National Laboratory in Italy in
May 2006. This beam will cover a distance
of around 730 km through the crust of the earth from an extraction line in CERN’s SPS to dedicated detectors
in Gran Sasso. This paper describes the technological choices made to fulfill the specification of inter-laboratory
synchronization in the region of 100 ns, as well as some preliminary results. The common time standard is UTC as
disseminated by the GPS system, and the techniques are similar to those used by national metrology laboratories for
the manufacturing of UTC itself. In addition, real-time messages sent through the Internet allow the detectors in
Gran Sasso to go into calibration mode when no beam is being sent. Data concerning the delay and determinism of
this international network link is also presented.
280 keV He-ion Pulsed Beam Accelerator for Surface Analysis of Materials by Using Timeof-flight
Ion Backscattering Spectrometry Technique
At Fast Neutron Research Facility in Tha-
P. Junphong (FNRF)
iand,an accelerator, originally used for neutron
scattering experiments with the time-offlight
technique, has recently been applied to a research field of ion beam analysis such as TOF-RBS. In such experiments
a beam of pulsed-D + ion of 2 ns wide and 140 keV in energy were used. To achieve better mass resolution for
TOF-RBS experiments, an upgrade of the accelerator to higher energy and heavier particles is necessary. To make use
of the existing pulsing system, a He±ion beam of 280 keV has been considered. The upgrade is now underway.Result
of the system measurments and Calculation will be presented.
Development of MATLAB-based Data Logging System at Siam Photon Source
New data logging and retrieval systems are
P. Klysubun, C. Netsai (NSRC)
currently under development at Siam Photon
Source. The systems are written entirely with
MATLAB language and utilize two MATLAB toolboxes to handle data communications. The two toolboxes are Open
Process Control Toolbox, which is used to carry out communications with Programmable Logic Controllers (PLCs)
via Open Process Control Data Access (OPCDA), and Data Acquisition Toolbox, which handles communications with
other systems via RS-232 and IEEE-488 interconnections. The interface with the database is handled by the MATLAB
Database Toolbox. These MATLAB-based logging and retrieval systems enable accelerator physicists to easily import
the logged data to accelerator modeling tools for studies of the accelerator optics. Beamline researchers and users can
also write their own retrieval programs to access only the data they need. In this paper we describe the concept, the
current status of the systems, and the planned improvements to be carried out in the future.
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