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Production of Low Energy Gamma-Ray by Inverse Compton Scattering using a Far Infrared Laser

使用远红外激光通过逆康普顿散射产生低能伽马射线

基本信息

批准号：
14205018
负责人：
OHKUMA Haruo
金额：
$ 34.69万
依托单位：
Japan Synchrotron Radiation Research Institute
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14205018/
关键词：
Inverse Compton Scattering Laser Electron Photon Gamma-Ray Far Infrared Laser Waveguide High Energy Syncrotron Radiation 原子核共鳴蛍光シンチレーター

项目摘要

1.Technology of low energy γ-ray productionFIR laser was transported to the laser incident chamber on the beamline front-end in the storage ring tunnel by hollow acrylic waveguides into which dry air of -40℃ dew-point temperature was flow. Its distance is about 20m long, and 80% transmission efficiency was achieved. Beam profile monitor using a pyro-electric sensor was developed and installed at 2m-upstream from the chamber. By using this monitor, laser optical axis was tuned for the interaction point to electron beam. By the calculation considering the diffraction effect by many aperture limits in the duct of front-end, a production rate of γ-ray was estimated to be Nγ=1.1×10^4 photons/sec per 2W FIR laser of 118.8μm.2.Development of high-power optically-pumped FIR laser234.5W-output power of the pumping CO_2 laser was achieved at 9P(38) lasing line, which was used for pumping CH_3OH for 118.8μm lasing. Maximum output power of FIR laser was about 1.6W, and ±1 % of power variation was … More achieved for a long-term stability of 24 hours. To produce 20MeV range γ-ray, a short wavelength FIR laser and optical material of silicon for 48μm- and 57μm-laser were developed.3.Measurement of produced γ-rayTo take measures of pileup of detection system and to reduce a background, LYSO scintillator was installed in 10mm-thickness Pb-box. Absorbers and collimator system were installed in front of the detector. Energy calibration was done by using radioactivity source of ^<88>Y. It was confirmed that stored electrons were not lost during the inverse Compton scattering. From measurement result, we estimated γ-ray production rate at 6×10^3 photons/sec per a 2W FIR laser.4.Future planTo produce high intense γ-ray, an advanced plan is in progress at the new beamline which has a 16m-long interaction region. Laser beam will be transported to near the interaction region by waveguides to recover a reduction of effective cross-section due to a large divergence of laser. Manufacture and installation of the mirror chamber, and construction of the laser clean room and the waveguide system were completed. In this beamline γ-ray production rate will be expected more than 10^5 photons/sec. Less

1.低能γ射线产生技术远红外激光通过空心丙烯酸波导传输到储存环隧道光束线前端的激光入射室，并通入露点温度为-40℃的干燥空气。其传输距离约为20 m，传输效率达到80%。束流剖面监测器采用热电传感器，并安装在2米上游的腔室。利用该监视器，可以对激光光轴进行调谐，使其对准电子束与激光的相互作用点。通过考虑前端波导中多个孔径极限的衍射效应的计算，估算出每2 W的118.8μ m远红外激光器产生γ射线的速率为Nγ=1.1×10^4光子/秒。2.高功率光泵远红外激光器的研制在9 P（38）激光线处获得了234.5W的泵浦CO_2激光器输出功率，用于泵浦甲醇产生118.8μm激光。远红外激光器的最大输出功率约为1.6W，± 1%的功率变化为 ...更多信息实现了24小时的长期稳定性。为了产生20 MeV的γ射线，研制了短波长远红外激光器和48μm和57μ m的硅光学材料。3.产生γ射线的测量为了减少探测系统的堆积和降低本底，在10 mm厚的铅盒中安装了LYSO闪烁体。在探测器前安装了吸收器和准直器系统。用~（40）Y放射性源进行能量刻度<88>。证实了存储的电子在逆康普顿散射期间没有丢失。根据测量结果，我们估计每2 W FIR激光器的γ射线产生率为6×10^3光子/秒。4.未来的计划为了产生高强度的γ射线，一个先进的计划正在进行中的新光束线，具有16米长的相互作用区域。激光束将通过波导传输到相互作用区附近，以恢复由于激光的大发散而导致的有效截面的减小。完成了镜室的制作和安装、激光洁净室和波导系统的搭建。在该光束线中，γ射线的产生速率预计将超过10^5光子/秒。少

项目成果

期刊论文数量（65）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Development of High Power Optically-Pumped cw FIR Lasers

高功率光泵浦连续波远红外激光器的研制

DOI：
发表时间：
2003
期刊：
Conference Digest of the 28th International Conference on Infrared and Millimeter Waves.
影响因子：
0
作者：
S.Okajima;et al.
通讯作者：
et al.

Development of a high intensity optically-pumped far infrared laser for production of γ-ray by inverse Compton scattering

开发用于通过逆康普顿散射产生γ射线的高强度光泵浦远红外激光器

DOI：
发表时间：
2002
期刊：
The Papers of Technical Meeting on Optical and Quantum Devices, IEE Japan(in Japanese) OQD-02-24
影响因子：
0
作者：
Y.Arimoto;H.Ohkuma;Y.Sato;S.Suzuki;K.Tamura;S.Okajima
通讯作者：
S.Okajima

Production of 10 MeV γ-ray by the Backward Compton Scattering Using and Optically-Pumped FIR Laser at SPring-8

利用 SPring-8 的后向康普顿散射和光泵浦 FIR 激光器产生 10 MeV γ 射线