文档介绍：*高能所暗物质探测预研—VeryPreliminary杨长根DAMAdama*第一个暗物质直接探测器(晶体)DAMA*ExperimentTargetType Status Site NationANAIS NaI annualmodulation constructionCanfrancSpainDAMA/NaI NaI annualmodulation concluded LNGS INFN-ITALYDAMA/LIBRANaI annualmodulation running LNGS INFN-ITALYDAMA/1tonNaI annualmodulation R&D LNGS INFN-ITALYNAIAD NaI PSD concluded BoulbyUKHDMS Ge ionizationconcluded LNGSINFN-ITALYKIMS CsI PSD R&D Y2LKorea Caf2-KamiokaCaF2PSDrunning KamiokaJapanDAMA/LxeLXe PSD runningLNGSINFN-ITALYWARP LAr2phaserunning LNGSINFN-ITALYXENON10 LXe2phase runningLNGSINFN-ITALYZeplinII LXe2phase running BoulbyUKZeplinIII LXe2phaseinstallationBoulbyUKArDM LAr 2phase R&D CanfrancSpainLUX LXe2phase R&D Dusel USACLEAN LNe PSD R&DUSADEAP LAr PSD R&DSNOLAB(CANADA)USAXMASS LXe PSD construction KamiokaJapanCDMS Ge bolometer running SoudanUSACRESST CaWO4bolometer runningLNGSINFN-ITALY-ItalyEDELWEISSGe bolometer runningFrejusFranceROSEBUDGe,sap,tungbolometer R&D CanfrancSpainCOUPP F SHdroplet R&DFermilabUSAPICASSO F SHdropletrunning+R&DSNOLABCANADASIMPLE F SHdropletrunning+R&DBasBruitFranceDrift CS2gasTPC R&D BoulbyUKMIMAC 3HegasTPC R&D已进行和正在进行的地下暗物质实验*平衡点:实验的本底够低(锦屏);有自己特点;阈能和探测器质量的兼顾:高纯锗~几公斤<液氙~100公斤(有效质量)<晶体~250公斤做一个快一些,价格低(快),技术相对成熟的实验*晶体PMTsVeto液体一个有创新性的方案(概念性设计)*合适的光学耦合剂可以被找到PropertiesLArLXeNaI(TI)CsI(Tl)(effective)1854515874τ(ns)10/15003/272301000300Photo/MeV4×-××××104Rindex(5893Å)(nm)125178415565480CsI(Na)的性能介绍•••峰值波长420nm•衰减时间630ns••光子数39000/,密度:,折射率:,沸点:180度,熔点:5~6℃,稳定性:稳定MYCRO公司进口折射率匹配液*SingleScintillator(CsI(Na)):30cm*10cm*10cmTotal:9Gap::cylinderSensitivityradius::9*6=54Coverage:%Gap::;attenuationlength:1m;Wavelengthrange:200nm~*改变glass折射率,PMT后面的真空,光阴极的折射率等各种条件,到达光阴极区域的光子数及随折射率变化的曲线形状几乎一致。折射率很大时下降得不多。加入光阴极量子效率,并且在玻璃折射率较低()时,曲线后半部分才出现较大降低。PMT的光阴极角度响应使得当匹配液折射率较大时,收集到的光子数降低。PMTgl