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

2001财年(近红外回旋加速器实验厅研制)1.提高气膜密度采用脉冲束方法，在分子束脉冲上升点提高气膜密度。增加了喷嘴和撇油器的改进，在喷嘴下游60 cm处，气膜密度达到3×10；-6托。换句话说，密度超过了目标值10^&lt；11；分子/cc.2。利用电流为5μA、能量为8 MeV的质子束，测量了气体碰撞产生的光。通过对N_2、O_2、A_γ和CO_2气体的比较，发现在可见光范围内，N_2的光产额最高。实验推测，对于密度为1×10~(-5)托的N_2气体，当束流强度为10~(-5)…时，在未来50GeV的同步加速器中，可以在一束通过的时间内测量到束流分布更多的符号价值。在不久的将来，探测器将被具有比现在快几十倍的增益的高增益照相机所取代，以实现更快的探测。2002财政年度(NIRS HIMAC-同步加速器和KEK的发展)1.在气片密度为7×10；-7&gt；Torr，12；C^&lt；6+&gt；的情况下，利用气片上的电离进行束流或电离测量(HIMAC)；在束流能量为6~430 MeV/u、束流强度为2.5×10~(-8)粒子/束的条件下，成功地在单束时间内测量了HIMAC同步加速器的束流分布。2.光探测型分布监测器(KEK)的研制研制了一种新型的紧凑型气体片式发生器。在喷嘴下游60 cm处，气膜密度增加到5×10；-6 Torr。并制作了测光检测室。根据对考虑高辐射场的光探测器的研究，使用非晶态硒作为光靶的HARP相机将是一种候选。2003年8月，整个装置将安装在KEK NML的束流线上，并将尽快进行光实验。较少

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