Determining of the Mir orbital complex orientation by indications of the optical star sensor

Abstract: The techniques and results are described for determining of the Mir orbital complex orientation by indications of the optical star sensor “Astro-1”.Note: Research direction:Theoretical and applied problems of mechanic

Evaluation of Microaccelerations on Board the Mir Station Through Optical Star Sensor.

Abstract: Two methods for determining the Mir orbital station attitude motion through optical star sensor are considered. The first method consists in smoothing measurement data by means of cubic splines, the second one is based on smoothing measurements by solutions of a variational problem for Poisson's kinematic equations. The knowledge of the station attitude motion allows to calculate low frequency component of microacceleration at given on board point. Examples of such calculations are given.Note: Research direction:Theoretical and applied problems of mechanic

Uncontrolled Attitude Motion of the Orbital Station Mir in 1999.

Abstract: The techniques are described for determining uncontrolled attitude motion of the orbital station Mir by means of processing on board measurements of the Earth magnetic field strength and telemetry information about the station orientation parameters and angular rates. The measurement data of the same type, collected on a time interval about a few hours, are processed simultaneously by means of the least squares methods and integration the station attitude motion equations. The estimations of the mathematical model parameters and initial conditions of an attitude motion are obtained as a result of such processing. The techniques allowed to determine the real station attitude motion in September - December 1999. The motion is divided on two segments. In the first segment (September 7 - 24), the station rotated around its axis of the minimal moment of inertia, which made small oscillation near the normal to the orbital plane. Such mode of the station attitude motion was used for the first time in the Russian practice. In the second segment (September 24 - December 7), the station was in the mode of biaxial rotation at first and then, after some weeks, it passed to the single axis rotation around the normal to the orbital plane but around the axis of the maximal moment of inertia.Note: Research direction:Theoretical and applied problems of mechanic

ALICE: Physics performance report, volume I

ALICE is a general-purpose heavy-ion experiment designed to study the physics of strongly interacting matter and the quark-gluon plasma in nucleus-nucleus collisions at the LHC. It currently includes more than 900 physicists and senior engineers, from both nuclear and high-energy physics, from about 80 institutions in 28 countries. The experimentwas approved in February 1997. The detailed design of the different detector systems has been laid down in a number of Technical Design Reports issued between mid-1998 and the end of 2001 and construction has started for most detectors. Since the last comprehensive information on detector and physics performance was published in the ALICE Technical Proposal in 1996, the detector as well as simulation, reconstruction and analysis software have undergone significant development. The Physics Performance Report (PPR) will give an updated and comprehensive summary of the current status and performance of the various ALICE subsystems, including updates to the Technical Design Reports, where appropriate, as well as a description of systems which have not been published in a Technical Design Report. The PPR will be published in two volumes. The currentVolume I contains: 1. a short theoretical overview and an extensive reference list concerning the physics topics of interest to ALICE, 2. relevant experimental conditions at the LHC, 3. a short summary and update of the subsystem designs, and 4. a description of the offline framework and Monte Carlo generators. Volume II, which will be published separately, will contain detailed simulations of combined detector performance, event reconstruction, and analysis of a representative sample of relevant physics observables from global event characteristics to hard processes. © 2004 IOP Publishing Ltd