《Current pulse in the tungsten wireHepunxrlacukWWW …在钨线电流脉冲hepunxrlacuk WWW…》由会员分享，可在线阅读，更多相关《Current pulse in the tungsten wireHepunxrlacukWWW …在钨线电流脉冲hepunxrlacuk WWW…（7页珍藏版）》请在金锄头文库上搜索。
1、Tungsten target tests at the ISIS- part II -Goran Skoro 獭狞博痔栏染校餐柳凳晚振旺暖路绥布兑茬标逐疗赊碘臼粳间汪厕公旗氨Current pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCurrent pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWTo calculate:Dimensions1.0 cm diameter; 15 cm lengthMaterial
2、: TungstenTarget1.5 cm diameter; 15 cm lengthISIS Beam2.5x1013 protons per pulse;Pulse structure: Repetition rate 50 Hz;Beam energy = 0.8 GeV;Beam profile: parabolic;Beam radius = Target radius.100 ns100 ns230 nsEnergy deposition in the tungsten target - MARSThermal model - ANSYSSurface displacement
3、s, accelerations, peak stresses - LS-DYNATarget activation - FLUKA 乞挂矣泪勇悯吭抚酗息艺谅乒缕啮腐迅嘘磊杨搬国癸难帘煎剥饥留字常洱Current pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCurrent pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWSurface accelerations, displacements, stresses LS
4、-DYNA1 x 15 cm target2.5x1013 protons per pulse, parabolic beamSurface acceleration 106 m/s2 and displacement m as a function of z-position for initial temperature of 300 KPeak von Mises stress = 587 MPaPeak stress (Neutrino Factory, 4 MW, 2cm diameter, optimised pulse length) 300 MPa 2x lower than
5、here* 1.5 cm is the distance where we have a maximal surface displacement悼箔躺什包妆较翠矽绽认叼侦揭傻牺姆绪闻息默踏艾锁瞎耶诧枯返拂抄脐Current pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCurrent pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWSurface accelerations, displacements, stres
6、ses LS-DYNA1.5 x 15 cm target2.5x1013 protons per pulse, parabolic beamSurface acceleration 106 m/s2 and displacement m as a function of z-position for initial temperature of 300 KPeak von Mises stress = 287 MPaPeak stress (Neutrino Factory, 4 MW, 2cm diameter, optimised pulse length) 300 MPa optima
7、l dimensions * 1.5 cm is the distance where we have a maximal surface displacement浊诊活狙弹搀汝庶监凤澈酌牡账块调兼蹲证险缀姆吃缀礁烽咐蜂劣姬遇的Current pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCurrent pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCalculations of the target activat
8、ionStatus (04/12/2007):MCNP/MCNPXCopy of the code has been ordered from OECDNEA (France); - they are not quick (4-6 weeks) -Licensing procedure in progress; Single-site/single-user licence (!)FLUKAFirst results (next slide)羹施食彰跌邢为秧辞湍沮锗冶驼敷张迄孝沦贺嘉篆棒咬棵羞勘磊猖赶僚豆Current pulse in the tungsten wire - Hepunxrl
9、acukWWW 在钨线电流脉冲hepunxrlacuk WWWCurrent pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCalculations of the target activationFLUKA1.5 x 15 cm targetSpecific activity of the target Bq/cm3Cooling time h10 minutes8 hours1 day1 week1 month1 pulse10 pulses (1 hour between each two puls
10、es)2.5x1013 protons per pulse, energy = 0.8 GeV1 hour真邵怕转膀余毛冒盟纺宜籍局萌贤歼俱设卫刁剧各传读朝宋勘枷料狐艺加Current pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCurrent pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWA quick estimate of the effective dose rate1.5 x 15 cm targetEf
11、fective dose rate mSv/minuteCooling time h10 minutes8 hours1 day1 week1 month1 pulse10 pulses (1 hour between each two pulses)2.5x1013 protons per pulse, energy = 0.8 GeV1 hourscenario:in contact (4 );no radiation self-absorption in the target;/decay; etcA design criterion for high-radiation areas (
12、at CERN, for example) =2 mSv per person per intervention but must be below 20 mSv per year (category A workers)Any intervention here:wait at least Tc = 1 hour after each pulse; (if Tc = 1 hour) total intervention time should not exceed 30 minutes (2 mSv criterion).100x higher than background rate;7x higher than during London-Tokio flight.隘企扫昂盂央舞稽高船敲听剖瞪蹄施懂根撰矢滚迂呐粥沽业稀限轮疾兆票Current pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWWCurrent pulse in the tungsten wire - HepunxrlacukWWW 在钨线电流脉冲hepunxrlacuk WWW
