{"created":"2023-05-15T15:29:07.893208+00:00","id":18680,"links":{},"metadata":{"_buckets":{"deposit":"28d195e5-4c8b-4f0b-8a63-daaf3c27191f"},"_deposit":{"created_by":15,"id":"18680","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"18680"},"status":"published"},"_oai":{"id":"oai:sucra.repo.nii.ac.jp:00018680","sets":["94:429:431:432:942"]},"author_link":[],"item_113_alternative_title_1":{"attribute_name":"タイトル（別言語）","attribute_value_mlt":[{"subitem_alternative_title":"稀少RIリングを用いた質量測定のための時間及び位置感応薄膜MCP検出器"}]},"item_113_biblio_info_9":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2018","bibliographicIssueDateType":"Issued"}}]},"item_113_date_35":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2019-07-12","subitem_date_issued_type":"Created"}]},"item_113_date_granted_20":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2018-09-21"}]},"item_113_degree_grantor_22":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"埼玉大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12401","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_113_degree_name_21":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士(理学)"}]},"item_113_description_13":{"attribute_name":"形態","attribute_value_mlt":[{"subitem_description":"xv, 233 p.","subitem_description_type":"Other"}]},"item_113_description_23":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"High accuracy and precise mass measurements of exotic nuclei are very important for the study of nuclear physics and nuclear astrophysics. To increase the accuracy and extend the capability of now existing storage ring techniques for mass measurements, a newly constructed storage ring, the Rare-RI Ring, operating as an isochronous Mass Spectrometry （IMS） in RIKEN Nishina center to measure the mass of rare radioactive ions with a target precision of 10-6 for even one event during a time of flight （TOF） less than 1 millisecond, has been commissioned and studied experimently. To satisfy the requirements of high resolution, good accuracy, very fast and efficient mass measurements with the Rare RI Ring as an IMS, the TOF and extra velocity/magnetic-rigidity （for TOF correction） have to be measured with required accuracy and high resolution. Therefore, a high efficiency, good resolution for both timing and position, large effective area and low energy loss detector are dispensable. For these reasons, the study of the principle of mass measurements via the new obit-IMS method （IMS TOF with extra velocity/magnetic-rigidity correction） by the Rare-RI Ring and the development of the high performance detector described are carried out in this thesis.\nAn experiment aimed to study the performance of the Rare RI Ring performing as an Isochronous mass spectroscopy （IMS） and the principle of IMS mass measurements with additional velocity or momentum measurements has been carried out at RIBF. In-flight fission fragments, created by 238U projectiles in a beryllium target at the entrance of the BigRIPS focus F0, were spatially separated by the BigRIPS-HA-SHARAQ beam-lines and injected into the Rare-RI Ring. In the experiment, we succeeded in selection, injection, accumulation and extraction of 5 different nuclei to R3 for mass determination and the isochronism ～5x10-6 was achieved by checking the TOF spectrum of 78Ge. A two stage selection and particle identification method has been carried out with the Bρ-TOF-ΔE-E method based on individual injection technique, and with this new method, all the ions have be well separated and identified for mass deduction analysis. The analysis of the data was done to investigate and verify that the IMS method with extra velocity or magnetic-rigidity correction can increase the mass accuracy and precision with a large momentum acceptance other than only using the IMS method without extra correction. It is proved that to achieve a high resolution, the revolution time measurement of the storied ions and the magnetic rigidity or the velocity for correction of the in ring TOF should be simultaneously measured, thus we can achieve higher resolution with small systematic error to cover relative large range of δm/m relative to reference ion in isochronous condition for the IMS method. From the analysis, it is also confirmed that from one experiment run, two complementary mass measurements methods （IMS and Bρ-TOF） can be employed simultaneously to deduce masses and benefit each other, in which it is very suitable to save beam time and cover large area of nuclide of chart and large momentum area of secondary products from experiment of very exotic nuclei. Besides, the first new mass of 74Ni which is not included in the newest atomic mass evolution （2016） is deduced in this work by Bρ-TOF method at the Rare-RI-Ring. The mass of 74Ni is very important for the research of nuclear shell effect and also shows importance of the impact on the r-process modeling. The pioneering mass measurements experiment by using two complementary time-of-flight methods （Bρ-TOF and IMS） simultaneously in one experiment run for mass determination in the world has been realized and verified within this work.\nIn the in-flight fission experiment, there is large energy loss in the PPAC at F6 dispersive focus, which is for position measurement to deduce the momentum have large influence to the mass accuracy. At the same time the timing resolution of MCP detector of about 200 ps can not satisfy the high resolution mass measurements form the TOF. For these reasons, a electrostatic large-area thin-foil MCP detector was developed at the RIBF, which possess a higher timing resolution and has a capability to measure the position （to deduce velocity and magnetic-rigidity） at the same time with low energy loss and a large active area.\nThe specification and performance of different position-sensitive anode that can be coupled with MCPs for position measurements have been studied systematically. A 2-dimentional delay-line type anode with dual wires for each coordinate are been chosen and utilized for our final design. The secondary electrons （SEs） electro-magnetic motion and trajectory in the detector are studied theoretically and by simulation. To calibrate the delay-line MCP detector （DLD120） system, a higher order calibration method is carried out and the precision and accuracy of the DLD120 system is discussed for different calibration methods. An isochronous condition for the operation of the electrostatic detector was calculated and studied by simulation. To characterize and optimize the timing and position resolution of the detector, the position resolution dependence of high voltage supplies has been studied both in the isochronous and non-isochronous condition by simulation and experimentally with 241Am alpha source. The detection efficiency and position resolution by using a carbon foil with thickness of 60 μg/cm2 or 2 μmm mylar foil coated with aluminium as SEs emitters are studied with variations of HV supplies of the detector potential plates. Two ex periments aimed at studying the performance （efficiency, timing and position resolution） of the position-sensitive timing detector were conducted at HIMAC （Heavy Ion Medical Accelerator in Chiba） with heavy ion beam for the detector with different grid pitch of 1mm and 3mm for the outer mirror. The performance of the detector have been optimized and the best achieved timing resolution and position is ≤ 50 ps and 1 mm in σ respectively, for which the detection efficiency is ～ 95 %. The performance of another same type of mirror detector coupled with timing anode which is dedicated for TOF measurement has been studied by heavy ions at HIMAC . The best achieved timing resolution is ～ 40 ps （in σ） and detection efficiency is ～ 96 % for heavy ion beams. This timing detector will be used for revolution time measurement inside R3, start TOF detector of the total TOF for in-ring circulation, beam-line TOF measurement for beam-line mass determination and velocity reconstruction for in-ring mass correction.\nProspects of mass measurements at the Rare RI Ring employing the two complementary time-of-flight methods （Bρ-TOF and Orbit-IMS） have been demonstrated and the versatility of the fast low-energy-loss position-sensitive timing detector developed within this work in use for in-ring and on beam-line are discussed and summarized. Other next generation facilities with storage rings which are in plan to perform IMS mass measurements and possible new methods are summarized.","subitem_description_type":"Abstract"}]},"item_113_description_24":{"attribute_name":"目次","attribute_value_mlt":[{"subitem_description":"1 Introduction 1\n1.1 The history and present of mass spectrometry . . . . . . . . . . . . . . . . 1\n1.2 Nuclear masses and mass models . . . . . . . . . . . . . . . . . . . . . . . 5\n1.3 Physics motivation for mass measurements at storage rings . . . . . . . . . 10\n1.3.1 Nuclear Structure Studies . . . . . . . . . . . . . . . . . . . . . . 11\n1.3.2 Test of nuclear mass models and mass formulas . . . . . . . . . . . 12\n1.3.3 Nuclear astrophysics . . . . . . . . . . . . . . . . . . . . . . . . . 13\n1.4 Techniques for mass measurements . . . . . . . . . . . . . . . . . . . . . . 21\n1.4.1 Indirect techniques . . . . . . . . . . . . . . . . . . . . . . . . . . 21\n1.4.2 Direct techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . 22\n2 TOF Mass measurements at the Rare-RI Ring and high resolution beam-line 37\n2.1 Rare-RI Ring at RIBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37\n2.2 Overview of present machine study experiments at the Rare-RI Ring . . . . 39\n2.3 In-flight fission for mass measurements at the Rare-RI Ring . . . . . . . . . 41\n2.3.1 Primary beam production . . . . . . . . . . . . . . . . . . . . . . 41\n2.3.2 Secondary beam production, separation and particle identification . 42\n2.3.3 Setup of beam-lines in conjunction with the Rare-RI-Ring as IMS . 44\n2.3.4 Setup of BigRIPS and High-resolution beam-line as Bρ-TOF Mass Spectrometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45\n2.3.5 Introduction of the SHARAQ spectrometry . . . . . . . . . . . . . 46\n2.4 Analysis of mass measurements experiment of 238U fission fragments . . . 47\n2.4.1 Particle identification (PID) . . . . . . . . . . . . . . . . . . . . . 47\n3 Results of in-flight fission mass measurement experiment 55\n3.1 Analysis results of Obit-IMS mass measurements . . . . . . . . . . . . . . 55\n3.1.1 Confirmation of circulation of RIs in the Rare-RI Ring . . . . . . . 57\n3.1.2 Isochronicity curve . . . . . . . . . . . . . . . . . . . . . . . . . . 58\n3.1.3 Extraction of RIs from the Rare-RI Ring . . . . . . . . . . . . . . . 58\n3.1.4 Double kicker TOF . . . . . . . . . . . . . . . . . . . . . . . . . . 59\n3.1.5 d E-E for PID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60\n3.1.6 Nuclear mass and m/q of bare ion . . . . . . . . . . . . . . . . . . 61\n3.1.7 Velocity and momentum correction IMS mass measurements . . . . 62\n3.2 Analysis results of Bρ-TOF mass measurements . . . . . . . . . . . . . . . 68\n3.2.1 TOF determination with magnetic rigidity correction . . . . . . . . 68\n3.2.2 Mass fit procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 72\n3.3 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82\n4 The Rare-RI Ring and high resolution beam-line at RIBF 85\n4.1 Introduction of MCP detectors for mass measurements . . . . . . . . . . . 85\n4.2 Requirements of detectors for high precision and accuracy mass measurements 87\n4.3 The electrostatic detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 89\n4.3.1 Description of the electrostatic mirror detector . . . . . . . . . . . 89\n4.3.2 Principles for timing and/or position sensitive MCP detector for heavy nuclei . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91\n4.4 Conversion foils and grid . . . . . . . . . . . . . . . . . . . . . . . . . . . 96\n4.5 Micro-channel plate (MCP) . . . . . . . . . . . . . . . . . . . . . . . . . . 98\n4.5.1 Introduction of MCP . . . . . . . . . . . . . . . . . . . . . . . . . 98\n4.5.2 MCP Operating principle and structure . . . . . . . . . . . . . . . 99\n4.6 Anodes for position sensitive MCP . . . . . . . . . . . . . . . . . . . . . 101\n4.6.1 Delay-Line Anodes (DL) . . . . . . . . . . . . . . . . . . . . . . . 101\n4.6.2 Selection of anode . . . . . . . . . . . . . . . . . . . . . . . . . . 105\n4.7 Simulation for the electrostaic detector . . . . . . . . . . . . . . . . . . . . 105\n4.8 The performance of delay-line anode MCP detector . . . . . . . . . . . . . 113\n4.8.1 The delay line anode . . . . . . . . . . . . . . . . . . . . . . . . . 113\n4.8.2 Preparation, assembly and mounting of the Delay-line detector . . . 114\n4.8.3 The high voltage supply for DLD and the foil detector . . . . . . . 117\n4.8.4 The delay-line and MCP signal, the signal processing . . . . . . . . 122\n5 Foil-MCP Detector Experimental Test 125\n5.1 Calibration of the MCP with helical delay-lines . . . . . . . . . . . . . . . 125\n5.2 Offline test of the electrostatic detector with DLD120 . . . . . . . . . . . . 147\n5.2.1 Experimental setup and basis of analysis . . . . . . . . . . . . . . . 147\n5.2.2 Offline test results with alpha source . . . . . . . . . . . . . . . . . 155\n5.3 Online test of the electrostatic detector . . . . . . . . . . . . . . . . . . . . 168\n5.3.1 Position-sensitive timing detector online test . . . . . . . . . . . . 168\n5.3.2 Timing electrostatic detector online test . . . . . . . . . . . . . . . 185\n5.4 Summary and Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188\n6 Summary and prospects 191\n6.1 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191\n6.2 Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193\n6.2.1 Other next generation facilities with storage rings for mass measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194\nReferences 197\nAppendix A Principle of Isochronous Mass Spectrometry 209\nA.1 Principle of Isochronous Mass Spectrometry (IMS) by the Rare-RI Ring . . 209\nA.1.1 Principle of orbit-IMS method at Rare-RI Ring . . . . . . . . . . . 213\nA.2 Magnets and Isochronous field of the Rare-RI Ring . . . . . . . . . . . . . 219\nAppendix B Specifications and Properties of MCPs & Storage, Handling and Operation of MCP 223\nB.1 Rectangular type chevron MCP . . . . . . . . . . . . . . . . . . . . . . . . 223\nB.1.1 Specifications and properties of rectangle-type MCP . . . . . . . . 223\nB.2 Circle type chevron MCP . . . . . . . . . . . . . . . . . . . . . . . . . . . 224\nB.3 Storage, Handling and Operation of Micro-channel Plates (from PHOTONIS)226\nAppendix C Dimensions 229\nAppendix D Analysis of m/q resolution by beam-line detectors 231","subitem_description_type":"Other"}]},"item_113_description_25":{"attribute_name":"注記","attribute_value_mlt":[{"subitem_description":"指導教員 : 上坂友洋","subitem_description_type":"Other"}]},"item_113_description_33":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"text","subitem_description_type":"Other"}]},"item_113_description_34":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_113_dissertation_number_19":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第1094号"}]},"item_113_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24561/00018649","subitem_identifier_reg_type":"JaLC"}]},"item_113_publisher_11":{"attribute_name":"出版者名","attribute_value_mlt":[{"subitem_publisher":"埼玉大学大学院理工学研究科"}]},"item_113_publisher_12":{"attribute_name":"出版者名（別言語）","attribute_value_mlt":[{"subitem_publisher":"Graduate School of Science and Engineering, Saitama University"}]},"item_113_record_name_8":{"attribute_name":"書誌","attribute_value_mlt":[{"subitem_record_name":"博士論文（埼玉大学大学院理工学研究科（博士後期課程））"}]},"item_113_text_31":{"attribute_name":"版","attribute_value_mlt":[{"subitem_text_value":"[出版社版]"}]},"item_113_text_36":{"attribute_name":"アイテムID","attribute_value_mlt":[{"subitem_text_value":"GD0001014"}]},"item_113_text_4":{"attribute_name":"著者 所属","attribute_value_mlt":[{"subitem_text_value":"埼玉大学大学院理工学研究科（博士後期課程）理工学専攻"}]},"item_113_text_5":{"attribute_name":"著者 所属（別言語）","attribute_value_mlt":[{"subitem_text_value":"Graduate School of Science and Engineering, Saitama University"}]},"item_113_version_type_32":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open 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MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"GD0001014.pdf","objectType":"fulltext","url":"https://sucra.repo.nii.ac.jp/record/18680/files/GD0001014.pdf"},"version_id":"f0043cad-c533-4e6d-bc9b-65b8d283b4a6"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Time and Position-sensitive Foil MCP Detector for Mass Measurements at the Rare-RI Ring","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Time and Position-sensitive Foil MCP Detector for Mass Measurements at the Rare-RI Ring","subitem_title_language":"en"}]},"item_type_id":"113","owner":"15","path":["942"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2019-07-12"},"publish_date":"2019-07-12","publish_status":"0","recid":"18680","relation_version_is_last":true,"title":["Time and Position-sensitive Foil MCP Detector for Mass Measurements at the Rare-RI Ring"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-06-23T09:19:46.441885+00:00"}