vibrationanddisplacementtests：振动和位移测试

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1、H.W.M.S.L.G.A.K.April16,2010PXLcoolingtest(Oct.,Nov.2009)Testgoals1Setup3Detectormockup3Systemarchitecture5Testequipment6Measurements6Initialtestingandobservations7Airflowcalibrations8Coolingtestsat290W10Coolingtestsat340W14Energytransfer17Vibrationanddisplacementtests:19Conclusions22TestgoalsThePXL

2、detector,partoftheHFTvertexdetector,featurestwoconcentriclayersofsiliconsensorsthatprovidefullazimuthalcoverage.Thedetectoriscomposedof10sectors[[]http://drupal.star.bnl.gov/STAR/event/2009/11/12/star-hft-cd-1-review/pixel-–-overview-and-mechanical].Eachsectoriscomposedofacarbonfiberbeamsupportequip

3、pedwith4ladders–3ontheouterlayerandoneontheinnerlayer.Thedetectorusesacantileveredsupport,leavingoneendofthedetectorunsupportedasshowninFigure1.22Figure1Imageofthemechanicalmodelofone-halfofthePXLdetectorcomposedof5sectors.Eachsectoriscomposedofacarbonfiberbeamsupportand4ladders,3ontheouterlayerand1

4、ontheinnerlayer.Thedetectorusesacantileveredsupport,leavingoneendofthedetectorunsupported.ThePXLdetectorisbuilttoprovideanexcellentpointingresolutionthatcanonlybeachievedifthemechanicalstabilityofthedetectoriswellcontrolled.Accordingtodesignrequirements,thepositionstabilityofthedetectorneedstobecont

5、rolledwithina20μmwindow.Siliconsensorsinthedetectorareexpectedtodissipateapproximately170mW/cm2whichamountsto270Wforthewholedetector.Inaddition,eachladderwillhostbuffersforreadoutandcontrolsignals,addinganestimated80Wforthewholedetector.Thisamountofpowerwillinducetemperaturechangesandthermalexpansio

6、nandcontractioninthemechanicalstructure,resultinginbimetal-typedeformationsthatwillaffectthepositionstability.Thermaldeformationstudiesindicatethatthemaximumresultingdisplacementduetoa20°Ctemperatureincreaseis9μm[[]http://www-rnc.lbl.gov/~wieman/Thermal%20deformation%20study.pdf].Anair-flowbasedcool

7、ingsystemenvisionedforthePXLdetectorispresentedinFigure2.Theprimarygoalofthissystemistolimitthedetectortemperaturechangesandlimitthermaldeformations.Figure2Graphicalpresentationofair-flowinthePXLcooli