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Ausbau und Optimierung des MLLTRAP-Penningfallensystems: Komplettierung des Multi-Passage-Spektrometers als Abschluss der Inbetriebnahme und Charakterisierung sowie Aufbau einer Kohlenstoff-Clusterionenquelle

MLLTRAP潘宁阱系统的扩展和优化：完成多通道谱仪的调试和表征以及碳簇离子源的构建

基本信息

批准号：
78251071
负责人：
Privatdozent Dr. Peter G. Thirolf
金额：
--
依托单位：
Lehrstuhl für Experimentalphysik - Medizinische Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/78251071?language=en
关键词：
Ausbau und Optimierung des MLLTRAP

项目摘要

A high-accuracy Penning trap mass spectrometer for radioactive nuclides ultimately aiming at a relative mass uncertainty of ( 10-9 is presently being set up at the Maier-Leibnitz-Laboratory in Garching ( MLLTRAP ). This extreme accuracy contributes, among other things, to metrology, and to tests of QED and fundamental CPT symmetry.A possibility for improving the accuracy of the fine structure constant α is given by determining the molar Planck constant NA•һ, combining a mass difference measurement between highly-charged nuclides differing by one neutron in the MLL Penning trap with wavelength measurements of corresponding capture (-rays, which will be performed in close collaboration with the group operating the GAMS facility at the ILL reactor (Grenoble). There the wavelengths of ( rays after neutron capture are measured to extreme accuracy.Highly accurate nuclear mass data on superallowed beta decays grant access to a precise determination of the Vud matrix element of the CKM quark mixing matrix, thus allowing for a stringent test of the unitarity of the CKM matrix. Here the MLLTRAP facility can contribute in a unique way by combining the superb intrinsic energy resolution of the Munich Q3D magnetic spectrograph (~ 2( 10-4) with the high mass accuracies reachable with MLLTRAP. This will allow for improved reaction Q-value measurements especially for the intended extension of the study of superallowed ß decays to heavier nuclei beyond A=54 (Co), where the (then larger) calculated Coulomb correction (C can be tested only at the expense of shorter lifetimes for the corresponding nuclei (thus preventing trap measurements). The determination of the ground state reference masses using the Penning trap combined with precise reaction Q-values from the magnetic spectrograph will allow for progress on probing the CVC hypothesis.A double-Penning-trap mass spectrometer for highly-charged, short-lived nuclides will be developed, combining several novel technologies in order to finally achieve ultimate mass accuracy. The ions will be sympathetically cooled to mK temperatures with a laser-cooled Mg+ plasma, allowing for an improved measurement precision. Consequently, instead of the usual preparation of isobarically purified ions of interest by buffer gas cooling inside a preparation Penning trap, it is planned to achieve the selection using an RF mass filter and a (multi-reflection) Time-of-Flight mass spectrometer after the efficient gas-stopping cell. After charge breeding inside an EBIS, the highly charged ions will be sympathetically cooled down to mK temperatures with laser-cooled Mg+ ions. The sympathetic cooling allows for an exact centering inside the precision traps as well as a considerable efficiency improvement.The setup of the Penningtrap system has already been completed and commissioning of the system is presently in progress and the buffergas stopping cell can be operated successfully with high efficiency. Consequently the scope of this application is the completion of the MLLTRAP facility in order to allow for highly-accurate mass measurements. This requires the setup of a multi-reflection time-of-flight spectrometer for isobaric purification, a multi-passage spectrometer allowing to introduce an EBIS charge breeder (with subsequent q/A selection) as well as the setup of a linear Paul trap for sympathetic laser cooling of the highly-charged ions.While the setup of the time-of-flight spectrometer and the Paul trap will be realized from local funds, within the present application the necessary investment funds for the charge breeder and the corresponding q/A-separator will be requested together with post doctoral positions for the Penning trap and charge breeder systems, respectively.

目前正在加兴的迈尔-莱布尼茨实验室(MLLTRAP)安装一台高精度的潘宁陷阱质谱仪，其最终目标是相对质量不确定度为(10-9)。通过测定摩尔-普朗克常数NA·α，结合MLL-Penning陷阱中相差一个中子的高带电核素之间的质量差测量和相应的俘获射线的波长测量，给出了提高精细结构常数һ精度的可能性。在那里，中子俘获后(射线)的波长被测量到极高的精度。关于超允许的β衰变的高精度的核质量数据允许精确地确定CKM夸克混合矩阵的VUD矩阵元素，从而允许对CKM矩阵的统一性进行严格的测试。在这里，MLLTRAP设施可以通过将慕尼黑Q3D磁谱仪卓越的固有能量分辨率(~2(10-4))与MLLTRAP可达到的高质量精度相结合，以一种独特的方式做出贡献。这将允许改进反应Q值测量，特别是将超允许ç衰变的研究扩展到A=54(Co)以上的更重的核，其中(然后更大的)计算库仑校正(C只能以相应核的较短寿命为代价进行测试(从而防止陷阱测量)。使用Penning陷阱结合来自磁谱仪的精确反应Q值来确定基态参考质量，将允许在探测CVC假说方面取得进展。将开发一种用于高电荷、短寿命核素的双Penning陷阱质谱仪，结合几种新技术，以最终实现最终的质量精度。离子将用激光冷却的镁离子等离子体相交冷却到MK温度，从而提高测量精度。因此，取代了通常通过在制备Penning捕捉器内进行缓冲气体冷却来制备感兴趣的等压纯化离子的方法，计划在高效的气体阻挡池之后使用RF质量过滤器和(多反射)飞行时间质谱仪来实现选择。在EBIS内电荷繁殖后，高电荷态离子将与激光冷却的镁离子一起相交地冷却到MK温度。交感冷却可使精密疏水阀精确对中，并显著提高效率。彭宁疏水器系统的设置已经完成，系统目前正在进行调试，缓冲气体阻止室可以成功地高效率运行。因此，这一应用的范围是MLLTRAP设施的完成，以便能够进行高精度的质量测量。这需要设置一个用于等压提纯的多反射飞行时间光谱仪，一个允许引入EBIS电荷增殖(具有随后的Q/A选择)的多通道光谱仪，以及设置一个线性Paul陷阱来对高电荷态离子进行交感激光冷却。虽然飞行时间光谱仪和Paul陷阱的设置将由当地资金实现，但在本申请中，将分别为电荷增殖和相应的Q/A分离器申请必要的投资资金以及Penning陷阱和电荷增殖系统的博士后职位。