High temporal resolution mapping of total suspended matter in Belgian coastal waters with SEVIRI data: a feasibility study

This study aims to investigate the potential of The Spinning Enhanced Visible and InfraRed Imager (SEVIRI) of the ‘Meteosat Second Generation’ (MSG) geostationary satellite system for suspended matter mapping in Belgian Coastal Waters. The SEVIRI radiometer has 12 spectral channels with a spatial resolution of 3km in all channels except the High Resolution Visual (HRV) channel, where the resolution is 1km. Data is available in near real time every 15 minutes. A test data set was obtained from the SEVIRI Archive of the Royal Meteorological Institute of Belgium reflectance values using a simple atmospheric correction algorithm. Total suspended matter is then estimated from reflectance at the higher spatial resolution offered by the HRV band. This preliminary study provides the basis for generation of geostationary ocean colour sensors opens the perspective of studying high frequency dynamics of the coastal ecosystem (resuspension of bottom sediments, growth and decay of algal blooms) as well as mitigating the problems of cloudiness encountered with the current generation of polar-orbiters (MODIS, MERIS, SeaWiFS). This sensitivity, wavelengths needed for atmospheric correction and the use of a high spatial resolution broadband channel

Uniformity Of The 2000 Test Beam Module With The New Optimal Filtering Coefficients

An original method to reconstruct electron and pion signals in the Liquid ARGon barrel calorimeter (LARG) is applied to test beam data collected at the H8 line of the CERN North Area in July and August 2000. The method is based on the use of optimal filtering coefficients and takes into account the electrical description of the read-out electronics in the reconstruction of the physics pulses. Results on improvements in the LARG response and in particular on the energy uniformity of the calorimeter are shown

Halo and Tail Generation Studies for Linear Colliders

Halo particles in linear colliders can result in significant losses and serious background which may reduce the overall performances. We present a study of various halo generation processes with numerical estimates. The aim is to allow to predict and minimize the halo throughout the accelerator chain including the final focus up to the experimental detectors. We include estimates for the planned CLIC beam line

Optimization and quality control of suspended particulate matter concentration measurement using turbidity measurements

The dry weight concentration of suspended particulate material, [SPM] (units: mg L?1), is measured by passing a known volume of seawater through a preweighed filter and reweighing the filter after drying. This is apparently a simple procedure, but accuracy and precision of [SPM] measurements vary widely depending on the measurement protocol and experience and skills of the person filtering. We show that measurements of turbidity, T (units: FNU), which are low cost, simple, and fast, can be used to optimally set the filtration volume, to detect problems with the mixing of the sample during subsampling, and to quality control [SPM]. A relationship between T and ?optimal filtration volume?, Vopt, is established where Vopt is the volume at which enough matter is retained by the filter for precise measurement, but not so much that the filter clogs. This relationship is based on an assessment of procedural uncertainties in the [SPM] measurement protocol, including salt retention, filter preparation, weighing, and handling, and on a value for minimum relative precision for replicates. The effect of filtration volume on the precision of [SPM] measurement is investigated by filtering volumes of seawater ranging between one fifth and twice Vopt. It is shown that filtrations at Vopt maximize precision and cost effectiveness of [SPM]. Finally, the 90% prediction bounds of the T versus [SPM] regression allow the quality control of [SPM] determinations. In conclusion it is recommended that existing [SPM] gravimetric measurements be refined to include measurement of turbidity to improve their precision and quality control

Uniformity of the 2000 test beam module with the new optimal filtering coefficients

An original method to reconstruct electron and pion signals in the Liquid ARGon barrel calorimeter (LARG) is applied to test beam data collected at the H8 line of the CERN North Area in July and August 2000. The method is based on the use of optimal filtering coefficients and takes into account the electrical description of the read-out electronics in the reconstruction of the physics pulses. Results on improvements in the LARG response and in particular on the energy uniformity of the calorimeter are shown

Halo Estimates and Simulations for Linear Colliders

Halo simulations and estimates are important for the design of future linear accelerators. We describe the main processes with analytic estimates and present our generic simulations in application to the ILC

Recent Improvements of PLACET

PLACET[1] is a program used to simulate the dynamics, including wakefields, of a beam in the main accelerating or decelerating part of a linac. It allows for the investigation of single- and multi-bunch effects, the simulation of normal RF cavities with relatively low group velocities, as well as transfer structures specific to CLIC. Recent improvements, including the possibility to simulate bunch compressors, ground motion, and the use of parallel computer systems, are presented in this paper