Measuring Ultrafast X-ray Spectrum by Single-photon Incident Method
-
摘要: 利用单光子入射方法测量了高强度超短脉冲激光 (1 3 0fs,1 0 16 W cm2, 744nm)与固体等离子体相互作用产生的超快 (ps)硬X射线 (>3 0keV)能量连续谱。采用铅屏蔽、激光脉冲和线性门同步符合技术将HPGeX射线谱仪的本底计数率降低到 1 0 -4 炮, 满足了单光子计数时的低本底要求。用该谱仪实际测量了激光等离子体产生的超快硬X射线能谱, 所得结果与理论预期符合。Abstract: Utilizing single photon incident method, the hard X ray continuum from interaction of intense ultrashort laser(130 fs,10 16 W/cm 2,744 nm) with solid plasma is measured. By use of Pb shielding and coincidence technology, the background counts are kept below 10 -4 per shot, which satisfies the low background requirement of single photon incident. The measured hard X ray spectrum coincides with theory prediction.
-
Keywords:
- single photon incident ,
- ultrafast hard X ray ,
- ultrashort ,
- solid target
-
-
[1] PerryMD, MourouG. TerawatttoPetawattSubpi cosecondLasers[J]. Science,1994,264:917~924. [2] KmetecJD, GordonCL, MacklinJJ, etal.MeVX rayGenerationWithaFemtosecondLaser[J]. PhysRevLett,1992,68(10):1527~1530. [3] MurnaneMM, KapteynHC, RosenMD, etal.Ul trafastX rayPulsesFromLaser producedPlasmas[J]. Science,1991,251:531~536. [4] RosePetruckC, JimenezR, GuoT. Picosecond mil liangstromLatticeDynamicsMeasuredbyUltrafastX rayDiffraction[J]. Nature,1999,398:310~312. [5] ZhangP, HeJT, ChenDB, etal.EffectsofaPre pulseonγ rayRadiationProducedbyaFemtosec ondLaserWithOnly5 mJEnergy[J]. PhysRevE, 1998,57(4):R3746~3748. [6] BastianiS, RousseA, GeindreJP, etal.ExperimentStudyoftheInteractionofSubpicosecondLaserPulsesWithSolidTargetsofVaryingInitialScaleLengths[J]. PhysRevE, 1997,56(6):7179~7185. [7] GibbonP, BellAR. CollisionlessAbsorptioninSharp edgedPlasmas[J]. PhysRevLett,1992,68(10):1535~1538.
计量
- 文章访问数: 1111
- HTML全文浏览量: 0
- PDF下载量: 1107