A development of a ultra-fast beam profile monitor for the high intensity proton beams

2001财政年度（NIRS回旋加速器实验大厅的开发）1.增加气片密度采用脉冲束方法，在分子束脉冲上升点增加气片密度。加上喷嘴和撇渣器的改进，在喷嘴下游60 cm处，气片密度达到3 × 10 <-6>↑ [3]。换句话说，密度超过了目标值10 μ <11>molecules/cc。用电流为5 μA、能量为8 MeV的质子束，测量了气体碰撞产生的光。比较了N_2、O_2、Aγ和CO_2气体片的种类，发现N_2气体片在可见光范围内的光产额最好。根据实验推测，在<-5>未来的50 GeV同步加速器上，当束流强度为10^质子/脉冲时，密度为1 × 10^电子的N_2气体片可以在一个束团通过的时间内测量出束流的轮廓，并以此作为测量的依据<14>。 ...更多信息 符号值。在不久的将来，探测器将被高增益照相机所取代，其增益比现在高几十倍，以实现更快的探测。2002财政年度（在NIRS HIMAC-同步加速器和KEK上开发）1.使用气体片上电离的束流orofile测量（HIMAC）在气体片密度为7 × 10 ↑ [3]的情况下<-7>，^<12>C^&lt;6+&gt; HIMAC同步加速器的束流剖面在一个聚束器的时间内得到了成功的测量，测量的束流条件是能量范围为6到430 MeV/u，束流强度为2.5 × 10^8帕仑/μ。2.光检测型轮廓监测器（KEK）的开发制造了新的紧凑尺寸的气片发生器。在喷嘴下游60 cm处，气体层密度增加至5 × 104<-6>托。还制作了用于光测量的检测室。根据对高辐射场光探测器的研究，采用非晶硒作为光靶的HARP相机将作为候选。2003年8月，整个装置将安装在KEK NML的光束线上，将尽快进行光实验。少

Fiscal year of 2001(Development at the experimental hall of the NIRS Cyclotron)1. Increasing the gas sheet densityWith employing a pulse beam method, the gas sheet density was increased atthe pointi of a pulse rising of molecular beams. Added the nozzle and the skimmer improvement, at the point of 60 cm downstream from the nozzle, thegas sheet density was reached 3 x 10^<-6> torr. In other words, the density was exceeded the aim value of 10^<11> molecules/cc.2. Experiments ofJisht detectionUsing proton beams having the current of 5 μA and the energy of 8 MeV, lights from collisions on gases were measured. Comparing species of the gas sheet, N_2, O_2, Aγ and CO_2, it was found N_2 has the best yield of the light among them in visible range.From experiments, it is guessed that with an N_2 gas sheet having a density of 1 x 10^<-5> torr, a beam profile can be measured within the time of one bunch passing in future 50 GeV synchrotron when the beam intensity is 10^<14> proton/pulse as the de … More sign value. In near future the detector wiH be Replaced byhigh gain camera having the gain of several ten times than now for more fast detection.Fiscal year of 2002(Development at the NIRS HIMAC-Synchrotron and KEK)1.Beam orofile measurement using ionization on the gas sheet (HIMAC)In case of the gas sheet density of 7 x 10^<-7> torr, ^<12>C^<6+> beam profiles of the HIMAC synchrotron were successfully measured within the time of one bunch under beam conditions of the energy renge of 6 to 430 MeV/u and the intensity of 2.5 x 10^8 paticles/bunch.2.Development of a light detection type profile monitor(KEK)New compact size gas sheet generator was fabricated. The gas sheet densit was increased up to 5 x 10^<-6> Torr at the 60 cm downstream from the nozzle. Also detection chamber for light measurement was made. According to the investigation of the light detector considering high radiation field, HARP camera using amorphous selenium as the light target will be employed as a candidate. On August 2003, the whole equipments will be installed in the beam Line of KEK NML, the light experiment will be done as soon as possible. Less