Dielectronic recombination (DR) is an important electron–ion recombination process. This process is generallyconsidered to occur in two steps,e??+Aq+![A(q??1)+]![A(q??1)+]+nhv ; (1) where in the first step a free ...Dielectronic recombination (DR) is an important electron–ion recombination process. This process is generallyconsidered to occur in two steps,e??+Aq+![A(q??1)+]![A(q??1)+]+nhv ; (1) where in the first step a free electron is captured simultaneously with the excitation of a bound electron. In the second step the doubly-excited ion is stabilized by emitting photons.展开更多
The total recombination rate coefficients of lithium-like 36Ar15+ ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP[1]. Fig. 1 (a) shows the DR spec...The total recombination rate coefficients of lithium-like 36Ar15+ ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP[1]. Fig. 1 (a) shows the DR spectrum for electron energy from 0 to 35 eV in the center-of-mass (c.m.) frame involving all the DR resonances associated with 2s1=2!2p1=2 and 2s1=2!2p3=2 excitations.展开更多
Laser cooling is the most promising method to achieve high phase-space densities, even crystalline beams for relativistic heavy ion at storage rings[1]. A test laser cooling experiment has been performed with 12C3+ io...Laser cooling is the most promising method to achieve high phase-space densities, even crystalline beams for relativistic heavy ion at storage rings[1]. A test laser cooling experiment has been performed with 12C3+ ions at the CSRe. In this experiment, the 12C3+ ions were produced from an electron cyclotron resonance (ECR) ion source, and due to the residual gas and the injection gases such as CO and CO2, 16O4+ ions will be produced at the same time.展开更多
Dielectronic recombination (DR) is a two-step resonance electron-ion collision process which can be utilized as a tool to measure precision spectroscopy for highly-charged ions (HCI). As a result, the isotope shift of...Dielectronic recombination (DR) is a two-step resonance electron-ion collision process which can be utilized as a tool to measure precision spectroscopy for highly-charged ions (HCI). As a result, the isotope shift of highly-charged ions can be measured by the DR technique and the nuclear properties such as the change in the mean-square charge radius can be extracted from the isotope shift[1].展开更多
The total recombination rate coefficient of Phosphorus-like 112Sn35+ have been measured at the main cooler storage ring (CSRm) employing the electron-ion merged-beams technique. The Phosphorus-like 112Sn35+ ions were ...The total recombination rate coefficient of Phosphorus-like 112Sn35+ have been measured at the main cooler storage ring (CSRm) employing the electron-ion merged-beams technique. The Phosphorus-like 112Sn35+ ions were injected into the CSRm at an energy of 3.7 MeV/u with a typical current of 50 eA, and the momentum spread of the ion beam is 210?4 after several seconds of cooling.展开更多
Laser cooling is one of the most promising techniques to reach high phase-space densities and achieve phasetransition, ordered beam even crystalline beam for relativistic heavy ion beams at storage rings[1]. In order ...Laser cooling is one of the most promising techniques to reach high phase-space densities and achieve phasetransition, ordered beam even crystalline beam for relativistic heavy ion beams at storage rings[1]. In order torealize laser cooling at the CSRe in IMP, we performed a test experiment by using a pulsed laser system to coolthe relativistic 12C3+ ion beams on the CSRe in September 2014. Fig. 1 is the schematic view of the experimentalsetup.展开更多
The main cooler storage ring (CSRm) equipped with an electron-cooler creates an ideal platform for dielectronicrecombination (DR) experiments. In order to fully understand our DR experimental setup and especially the ...The main cooler storage ring (CSRm) equipped with an electron-cooler creates an ideal platform for dielectronicrecombination (DR) experiments. In order to fully understand our DR experimental setup and especially the electronenergy detuning system, we have performed a DR calibration experiment using the Li-like argon ions at theCSRm. The Ar15+ has a simple electronic structure so the DR spectrum can be calculated with an ultra-highprecision and compared with the existing experimental data. The experiment was carried out at the relative energyfrom 0 to 32 eV that includes all DR resonances associated with 2s1=2 ! 2p1=2 and most of the 2s1=2 ! 2p3=2excitations.展开更多
Laser cooling of heavy ion beams is the most promising method to realize crystalline beams at storage rings[1].In order to perform the laser cooling experiment of C3+ at the CSRe[2], we tested the laser propagation an...Laser cooling of heavy ion beams is the most promising method to realize crystalline beams at storage rings[1].In order to perform the laser cooling experiment of C3+ at the CSRe[2], we tested the laser propagation and controlby using the He-Ne laser at the straight part (about 25 m long) before the experiment. The experimental resultsindicated that the laser was collimated and stable, and the laser intensity was strong enough after a long distancepropagation at the CSRe which satis ed the requirement of laser cooling of heavy ion beams.展开更多
The cooling of heavy ions can provide high-quality beams that are especially important for high-precisionexperimental nuclear and atomic physics. The laser cooling of relativistic C3+ ion beams at the experimental coo...The cooling of heavy ions can provide high-quality beams that are especially important for high-precisionexperimental nuclear and atomic physics. The laser cooling of relativistic C3+ ion beams at the experimental coolerstorage ring (CSRe) is being currently prepared at Institute of Modern Physics (IMP) in Lanzhou. An electroncyclotron resonance ion source (ECRIS) will be used to produce C3+ ion beams. Meanwhile, O4+ ions could alsobe produced due to residual gas because of the same mass-to-charge ratio. Therefore, both C3+ and O4+ ion beamswill be injected and circulate in a storage ring during the laser cooling experiment at the same time. A higher ratioof C3+ ions will lead to a better result for the laser cooling experiment.展开更多
Recombination of Ar^(14+),Ar^(15+),Ca^(16+) and Ni^(19+) ions with electrons has been investigated at low energy range at the CSRm.For each ion,the absolute recombination rate coefficients have been measured with elec...Recombination of Ar^(14+),Ar^(15+),Ca^(16+) and Ni^(19+) ions with electrons has been investigated at low energy range at the CSRm.For each ion,the absolute recombination rate coefficients have been measured with electron-ion collision energies from 0 to 1000 meV which include the radiative recombination(RR)and also dielectronic recombination(DR)processes.In order to interpret the measured results.展开更多
The absolute rate cofficients for dielectronic recombination(DR)of F-like Ni^(19+) ions were measured by employing the electron-ion merged-beam technique at the heavy-ion storage ring CSRm.The measured DR spectrum cov...The absolute rate cofficients for dielectronic recombination(DR)of F-like Ni^(19+) ions were measured by employing the electron-ion merged-beam technique at the heavy-ion storage ring CSRm.The measured DR spectrum covers the energy range of 0~70 eV.展开更多
A new,compact and exible low energy experimental platform of highly charged ions(HCIs)based on an electron beam ion source of the Dresden EBIS-A type is presented.The so-called IMP EBIS-A Facility of the Institute of ...A new,compact and exible low energy experimental platform of highly charged ions(HCIs)based on an electron beam ion source of the Dresden EBIS-A type is presented.The so-called IMP EBIS-A Facility of the Institute of Modern Physics(IMP)in Lanzhou is designed as a user facility for the state-resolved charge exchange studies in HCIs with atoms and molecules collisions by cold target recoil ion momentum spectroscopy(COLTRIMS).展开更多
The absolute rate coefficients for dielectronic recombination(DR)of Na-like Kr^(25+) ions were measured by employing the electron-ion merged-beam technique at the heavy-ion storage ring CSRm.The measured DR spectrum c...The absolute rate coefficients for dielectronic recombination(DR)of Na-like Kr^(25+) ions were measured by employing the electron-ion merged-beam technique at the heavy-ion storage ring CSRm.The measured DR spectrum covers the energy range of 0~70 eV.展开更多
基金National Natural Science Foundation of China(11320101003), External Cooperation Program of Chinese Academy of Sciences(GJHZ1305)
文摘Dielectronic recombination (DR) is an important electron–ion recombination process. This process is generallyconsidered to occur in two steps,e??+Aq+![A(q??1)+]![A(q??1)+]+nhv ; (1) where in the first step a free electron is captured simultaneously with the excitation of a bound electron. In the second step the doubly-excited ion is stabilized by emitting photons.
基金National Natural Science Foundation of China(11320101003), External Cooperation Program of Chinese Academy of Sciences(GJHZ1305)
文摘The total recombination rate coefficients of lithium-like 36Ar15+ ions have been measured by employing the electron-ion merged-beams technique at the heavy ion storage ring CSRm at IMP[1]. Fig. 1 (a) shows the DR spectrum for electron energy from 0 to 35 eV in the center-of-mass (c.m.) frame involving all the DR resonances associated with 2s1=2!2p1=2 and 2s1=2!2p3=2 excitations.
基金National Natural Science Foundation of China(11504388), West Light Doctoral Foundation of Chinese Academy of Sciences
文摘Laser cooling is the most promising method to achieve high phase-space densities, even crystalline beams for relativistic heavy ion at storage rings[1]. A test laser cooling experiment has been performed with 12C3+ ions at the CSRe. In this experiment, the 12C3+ ions were produced from an electron cyclotron resonance (ECR) ion source, and due to the residual gas and the injection gases such as CO and CO2, 16O4+ ions will be produced at the same time.
基金Natural Science Foundation of China(11320101003), External Cooperation Program of Chinese Academy of Sciences(GJHZ1305)
文摘Dielectronic recombination (DR) is a two-step resonance electron-ion collision process which can be utilized as a tool to measure precision spectroscopy for highly-charged ions (HCI). As a result, the isotope shift of highly-charged ions can be measured by the DR technique and the nuclear properties such as the change in the mean-square charge radius can be extracted from the isotope shift[1].
文摘The total recombination rate coefficient of Phosphorus-like 112Sn35+ have been measured at the main cooler storage ring (CSRm) employing the electron-ion merged-beams technique. The Phosphorus-like 112Sn35+ ions were injected into the CSRm at an energy of 3.7 MeV/u with a typical current of 50 eA, and the momentum spread of the ion beam is 210?4 after several seconds of cooling.
文摘Laser cooling is one of the most promising techniques to reach high phase-space densities and achieve phasetransition, ordered beam even crystalline beam for relativistic heavy ion beams at storage rings[1]. In order torealize laser cooling at the CSRe in IMP, we performed a test experiment by using a pulsed laser system to coolthe relativistic 12C3+ ion beams on the CSRe in September 2014. Fig. 1 is the schematic view of the experimentalsetup.
文摘The main cooler storage ring (CSRm) equipped with an electron-cooler creates an ideal platform for dielectronicrecombination (DR) experiments. In order to fully understand our DR experimental setup and especially the electronenergy detuning system, we have performed a DR calibration experiment using the Li-like argon ions at theCSRm. The Ar15+ has a simple electronic structure so the DR spectrum can be calculated with an ultra-highprecision and compared with the existing experimental data. The experiment was carried out at the relative energyfrom 0 to 32 eV that includes all DR resonances associated with 2s1=2 ! 2p1=2 and most of the 2s1=2 ! 2p3=2excitations.
文摘Laser cooling of heavy ion beams is the most promising method to realize crystalline beams at storage rings[1].In order to perform the laser cooling experiment of C3+ at the CSRe[2], we tested the laser propagation and controlby using the He-Ne laser at the straight part (about 25 m long) before the experiment. The experimental resultsindicated that the laser was collimated and stable, and the laser intensity was strong enough after a long distancepropagation at the CSRe which satis ed the requirement of laser cooling of heavy ion beams.
基金National Natural Science Foundation of China (10979007, 91126004, 11274317)
文摘The cooling of heavy ions can provide high-quality beams that are especially important for high-precisionexperimental nuclear and atomic physics. The laser cooling of relativistic C3+ ion beams at the experimental coolerstorage ring (CSRe) is being currently prepared at Institute of Modern Physics (IMP) in Lanzhou. An electroncyclotron resonance ion source (ECRIS) will be used to produce C3+ ion beams. Meanwhile, O4+ ions could alsobe produced due to residual gas because of the same mass-to-charge ratio. Therefore, both C3+ and O4+ ion beamswill be injected and circulate in a storage ring during the laser cooling experiment at the same time. A higher ratioof C3+ ions will lead to a better result for the laser cooling experiment.
基金National Key R&D Program of China(2017YFA0402300)National Natural Science Foundation of China(U1932207,11904371,U1732133)。
文摘Recombination of Ar^(14+),Ar^(15+),Ca^(16+) and Ni^(19+) ions with electrons has been investigated at low energy range at the CSRm.For each ion,the absolute recombination rate coefficients have been measured with electron-ion collision energies from 0 to 1000 meV which include the radiative recombination(RR)and also dielectronic recombination(DR)processes.In order to interpret the measured results.
基金National Key R&D Program of China(2017YFA0402300)National Natural Science Foundation of China(U1732133,Y602080YQ0,Y602110XD0)。
文摘The absolute rate cofficients for dielectronic recombination(DR)of F-like Ni^(19+) ions were measured by employing the electron-ion merged-beam technique at the heavy-ion storage ring CSRm.The measured DR spectrum covers the energy range of 0~70 eV.
基金National Key R&D Program of China(2017YFA0402400,2017YFA0402300)National Natural Science Foundation of China(11274317)。
文摘A new,compact and exible low energy experimental platform of highly charged ions(HCIs)based on an electron beam ion source of the Dresden EBIS-A type is presented.The so-called IMP EBIS-A Facility of the Institute of Modern Physics(IMP)in Lanzhou is designed as a user facility for the state-resolved charge exchange studies in HCIs with atoms and molecules collisions by cold target recoil ion momentum spectroscopy(COLTRIMS).
基金National Key R&D Program of China(2017YFA0402300)National Natural Science Foundation of China(U1732133,Y602080YQ0,Y602110XD0)。
文摘The absolute rate coefficients for dielectronic recombination(DR)of Na-like Kr^(25+) ions were measured by employing the electron-ion merged-beam technique at the heavy-ion storage ring CSRm.The measured DR spectrum covers the energy range of 0~70 eV.
