A position-sensitive Schottky Cavity Doublet(SCD)was developed to enhance the accuracy of isochronousmass measurement at the Rare Radio-Isotope Ring(R3)at RIBF-RIKEN,Japan.The aim is to increase theaccuracy of positio...A position-sensitive Schottky Cavity Doublet(SCD)was developed to enhance the accuracy of isochronousmass measurement at the Rare Radio-Isotope Ring(R3)at RIBF-RIKEN,Japan.The aim is to increase theaccuracy of position measurement,which is used to correct the momentum spread,thus reducing the uncertainty inthe mass determination.The detector comprises a cylindrical reference cavity and elliptical position-sensitive cavity,which uses an offset beam-pipe to create a relation between the Schottky power and horizontal position.The uncertaintyin the power response can be improved by minimizing free parameters inside the power equation,providing asecond-order correction for the position determination.This requires a large dispersion and momentum spread to effectivelycharacterize the SCD acceptance,which simulations show is achieved when using^(76)Zn as a reference isotope.A key parameter to minimize is uncertainty of the impedance map,which relates power to position in the ellipticalcavity.We find that an uncertainty in impedance of 0.3Ωresults in a precision equal to that of the current massmeasurement method.Additionally,measuring momentum with the SCD enables the removal of other detectorsfrom the beam-line,which drastically reduces the yield of high-Z beams via charge-change interactions.展开更多
Non-destructive Schottky detectors are indispensable devices widely used in experiments at heavy-ion storage rings.In particular,they can be used to accurately determine the masses and lifetimes of short-lived exotic ...Non-destructive Schottky detectors are indispensable devices widely used in experiments at heavy-ion storage rings.In particular,they can be used to accurately determine the masses and lifetimes of short-lived exotic nuclear species.Single-ion sensitivity-which is the highest level of sensitivity-has been regularly achieved in the past by utilizing resonant cavity detectors.Recent designs and analysis methods aim to push the limits of measurement accuracy by increasing the dimensionality of the acquired data,namely,the position of the particle as well as the phase difference between several detectors.This paper describes current methods and future perspectives for Schottky detection techniques,with a focus on their application to mass and lifetime measurements of the most rare and simultaneously short-lived radio nuclides.展开更多
The application of software defined radio in on-line interactions with the beam processes of the heavy ion storage ring is presented.We discusse how this new technique can enhance the beam time efficiency and create n...The application of software defined radio in on-line interactions with the beam processes of the heavy ion storage ring is presented.We discusse how this new technique can enhance the beam time efficiency and create new measurement possibilities.A specific example to halt the accelerator running if a rare stored particle is identified on-line is discussed.展开更多
The rare radioactive-isotope(RI)ring is an isochronous storage ring for deriving the masses of extremely short-lived rare RIs.Since the successful commissioning experiment in 2015,the time of flight mass measurement t...The rare radioactive-isotope(RI)ring is an isochronous storage ring for deriving the masses of extremely short-lived rare RIs.Since the successful commissioning experiment in 2015,the time of flight mass measurement technique has been established through test experiments using unstable nuclei with well-known masses.The experiments for unknown masses were started in 2018.While conducting experiments,we continue to develop equipment to further improve the efficiency and precision of mass measurements.The upgraded kicker system can generate a magnetic field with an extractable duration equivalent to the revolution time of the ring.This is essential for extracting extremely rare events as well as shortening the measurement time compared with that in the initial experiments.New steering magnets make it possible to eliminate an uncertain vertical beam deviation that occurs upstream.As a result,we confirm that the extraction yield is increased.A new resonant Schottky pick-up is able to detect single particles in timeframes on the order of milliseconds.It will be useful not only for beam diagnostics but also for lifetime measurement experiments of extremely short-lived rare RIs planned as a future application.展开更多
基金support from the State of Hesse within the Research Cluster ELEMENTS(project ID 500/10.006)。
文摘A position-sensitive Schottky Cavity Doublet(SCD)was developed to enhance the accuracy of isochronousmass measurement at the Rare Radio-Isotope Ring(R3)at RIBF-RIKEN,Japan.The aim is to increase theaccuracy of position measurement,which is used to correct the momentum spread,thus reducing the uncertainty inthe mass determination.The detector comprises a cylindrical reference cavity and elliptical position-sensitive cavity,which uses an offset beam-pipe to create a relation between the Schottky power and horizontal position.The uncertaintyin the power response can be improved by minimizing free parameters inside the power equation,providing asecond-order correction for the position determination.This requires a large dispersion and momentum spread to effectivelycharacterize the SCD acceptance,which simulations show is achieved when using^(76)Zn as a reference isotope.A key parameter to minimize is uncertainty of the impedance map,which relates power to position in the ellipticalcavity.We find that an uncertainty in impedance of 0.3Ωresults in a precision equal to that of the current massmeasurement method.Additionally,measuring momentum with the SCD enables the removal of other detectorsfrom the beam-line,which drastically reduces the yield of high-Z beams via charge-change interactions.
基金support by the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006)support by the project "NRW-FAIR"+1 种基金a part of the programme "Netzwerke 2021"an initiative of the Ministry of Culture and Science of the State of North Rhine-Westphalia。
文摘Non-destructive Schottky detectors are indispensable devices widely used in experiments at heavy-ion storage rings.In particular,they can be used to accurately determine the masses and lifetimes of short-lived exotic nuclear species.Single-ion sensitivity-which is the highest level of sensitivity-has been regularly achieved in the past by utilizing resonant cavity detectors.Recent designs and analysis methods aim to push the limits of measurement accuracy by increasing the dimensionality of the acquired data,namely,the position of the particle as well as the phase difference between several detectors.This paper describes current methods and future perspectives for Schottky detection techniques,with a focus on their application to mass and lifetime measurements of the most rare and simultaneously short-lived radio nuclides.
基金support by the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006)support by the project "NRW-FAIR"a part of the programme "Netzwerke 2021".
文摘The application of software defined radio in on-line interactions with the beam processes of the heavy ion storage ring is presented.We discusse how this new technique can enhance the beam time efficiency and create new measurement possibilities.A specific example to halt the accelerator running if a rare stored particle is identified on-line is discussed.
基金Supported by RIKEN Pioneering Project funding and JSPS KAKENHI(17H01123,18H03695,21H04461,23K25876.)。
文摘The rare radioactive-isotope(RI)ring is an isochronous storage ring for deriving the masses of extremely short-lived rare RIs.Since the successful commissioning experiment in 2015,the time of flight mass measurement technique has been established through test experiments using unstable nuclei with well-known masses.The experiments for unknown masses were started in 2018.While conducting experiments,we continue to develop equipment to further improve the efficiency and precision of mass measurements.The upgraded kicker system can generate a magnetic field with an extractable duration equivalent to the revolution time of the ring.This is essential for extracting extremely rare events as well as shortening the measurement time compared with that in the initial experiments.New steering magnets make it possible to eliminate an uncertain vertical beam deviation that occurs upstream.As a result,we confirm that the extraction yield is increased.A new resonant Schottky pick-up is able to detect single particles in timeframes on the order of milliseconds.It will be useful not only for beam diagnostics but also for lifetime measurement experiments of extremely short-lived rare RIs planned as a future application.
