Tracking Property of Adjacent Track Servo System for Optical Disk Drives

Abstract

In this article we describe simulations of Higgs boson production via the gluon fusion and Higgs-strahlung processes, using the positive weight next-to-leadingorder (NLO) matching scheme, POWHEG, in the Herwig++ 2.3 event generator. This formalism consistently incorporates the full NLO corrections to these processes within the parton shower simulation, without the production of negative weight events. These simulations include a full implementation of the truncated shower required to correctly model soft emissions in an angular-ordered parton shower. We present a thorough validation of these simulations, comparing them to other methods and calculations. The results obtained for the gluon fusion process corroborate, and provide detailed explanations for, findings reported by Alioli et al using an independent POWHEG simulation, neglecting truncated shower effects, released at the same time as our code.

High Precision Tracking Control based on Pseudo-Inverse Feedforward Control System for Next-Generation Optical Disks

“…Therefore, a high-precision tracking control system for optical disks is required. [9][10][11][12][13][14][15][16][17] In addition, speeding-up of the data transfer rate is also required for video archive media. Magnetic tape for TV program recording and video archiving has a transfer rate of 230 Mbps.…”

Robust Adjacent Track Servo System with Linear Positioning Method

“…Therefore, we proposed an adjacent tracking servo (ATS) system to record optical disks without track information. 18) We used two laser beams, one for tracking and one for recording. The tracking beam follows the track that was previously recorded by the recording beam.…”

“…In this paper, we propose a robust ATS system with the linear positioning method (LPM). The ATS system we proposed previously 18) needs a virtual loop to improve the tracking performance. However, the virtual loop system does not have sufficient robustness against shock and vibrations, because the loop uses only predicted data.…”