Belogurov, S.

Kolosova, A.

Kunkel, J.

GSI Repository

Application of the CBM Silicon Tracking System CAD model for integrationstudiesS. Belogurov∗2, A. Kolosova2, and J. Kunkel11GSI, Darmstadt, Germany; 2ITEP, Moscow, RussiaMotivationThe high density of equipment inside the gap of theCBM dipole magnet requires special attention to the inte-gration effort and, more generally speaking, to the systemengineering of the set-up. In this report we discuss the cur-rent status of the system integration effort, the tasks to besolved and the methods in use.CAD (Computer Aided Design) software is one of themajor tools in complex system development. It is usedto create a virtual model of the product in development.For the CBM STS detector system a virtual model of thewhole system is created with CATIA, a software pack-age for product development that covers the whole processfrom first sketches to final drawings for the manufacturingof components.Status and tasks of the system integrationThe STS detector system is designed in functional parts,such as main detector parts, mounting structures, enclo-sures and supply lines. The virtual model in the CAD soft-ware is set up in the same way. Since parts and assembliesare stored in separate files, collaborative work on differentparts of the detector at the same time is possible.One important integration task is to reserve space for var-ious functional nodes. Currently we develop to arrangein space of the following items: Sensors, sectors, mod-ules, ladders, data cables, C-shaped supporting frame forladders, fixation for the ladders and for the cables, front-end-boards (FEB), FEB fixation and cooling boxes, coolingplates common for a unit (i.e. two neighbouring half sta-tions belonging to the two consequent stations), CO2 cool-ing connections, power supply lines for FEBs, data trans-port lines from FEBs to data aggregation boards, voltageconditioners for the FEBs, optical links and cooling boxesfor voltage conditioners, data aggregation boards and opti-cal links. An overall view of the STS and a detailed viewof one quarter of the 8th station are shown in Figs. 1 and 2,respectively. Generally, the design of the STS follows anonion logic from the innermost parts to the outer ones.Space analysis allows to see the critical elements in thesystem. E.g. it has been demonstrated that the avail-ability of single-channel radiation hard SFP optical linksonly causes a limitation on the total number of channelsin the system. Any development towards higher granular-ity would require new radiation hard multichannel opticallinks.∗Work supported by FAIR Russia Reseach CenterAnother task for the system integration is to study and tobalance contradictory requirements of various origin. E.g.front-end electronics developers tend to insist on the short-est possible cables in any particular case, however the rea-soning of the C-Shaped frame rigidity and cooling platebeauty forces us to use sometimes the cables a bit longerthan absolute minimum. A further issue under investiga-tion is the checking for all the possible dependencies, e.g.the thickness of cooling plates has influence on the spaceavailable for bending of cables, and the pad pattern on dif-ferent sensors, staggering of the sensors in a ladder andspacing between the FEBs in the working position are con-nected to the reduction of the number of different types ofcables.Methods in useFor the integration studies a deeply parametrized modelhas been created using the CATIA VBA code called “STScreator”. The tool arranges correctly in space all the com-ponents based on parametrized templates. The compositionof the ladders can be modified later and all the parts likeCF ladder support frames, C-shape unit frames and coolingplated will be adjusted automatically. The entire model canbe checked for interferences, margins and free space. Us-ing such a tool allows saving a lot of manpower and timesince, for the CBM STS, the active detector part consists ofseveral hundreds of parts.For making design information available for furtheranalysis each functional node has an HTML description ac-cessible from CATIA. Cross links to descriptions of motherand daughter products are generated automatically. A database for design solutions, options, versions, open questionsand mutual dependencies is under development. Data re-trieval from this base can be made available from the abovementioned HTML documentation.Next stepsWe plan to establish a CAD data exchange platform forefficient collaborative work on the project. Dedicated pro-grams like Git and Subversion are available for softwaredevelopers. Although CATIA files are binary such a toolcould satisfy our needs for sharing data and revision con-trol. Special programs for CAD data handling are underinvestigation, too. The design solution database mentionedabove should be transferred from prototype to developmentstatus. The outer layers of the system, like connecting unitto the outside world, thermal enclosure and the mechanicalsuper structure should be developed rather soon.GSI SCIENTIFIC REPORT 2013 NQM-CBM-16doi:10.15120/GR-2014-1-NQM-CBM-16 31Figure 1: Overall view of all 8 STS stations.Figure 2: One quarter of station 8 including readout and data transfer electronics, power supply and cooling equipment.NQM-CBM-16 GSI SCIENTIFIC REPORT 201332 doi:10.15120/GR-2014-1-NQM-CBM-16

Application of the CBM Silicon Tracking System CAD model for integration studies

http://repository.gsi.de/record/67762/files/NQM-CBM-16.pdf

Application of the CBM Silicon Tracking System CAD model for integration studies

Abstract

Similar works

Full text

Available Versions

GSI Repository