Status of the JINR polarized ion source development is described. The source is under tests at the test-bench of LHEP, JINR. A charge-exchange plasma ionizer has been tested initially without a ...storage cell in the ionization region. An unpolarized deuterium ion beam with peak current of 160 mA, 23 keV energy, pulse duration of 100 μs and repetition rate of 1 Hz has been extracted from the ionizer. With a free polarized atomic hydrogen beam injected into the ionizer a polarized proton beam with peak current of 1.4 mA has been obtained. The nearest plans for the source development include tests of the ionizer with the storage cell and tuning of the high frequency transition units installed in their operating position with a Breit-Rabi polarimeter.
The JINR atomic beam type polarized ion source is described. Results of tests of the plasma ionizer with a storage cell and of tuning of high frequency transition units are presented. The source was ...installed in a linac injector hall of NUCLOTRON in May 2016. The source has been commissioned and used in the NUCLOTRON runs in 2016 and February - March 2017. Polarized and unpolarized deuteron beams were produced as well as polarized protons for acceleration in the NUCLOTRON. Polarized deuteron beam with pulsed current up to 2 mA has been produced. Deuteron beam polarization of 0.6-0.9 of theoretical values for different modes of high frequency transition units operation has been measured with the NUCLOTRON ring internal polarimeter for the accelerated deuteron and proton beams.
Status of the SPI for the JINR Accelerator Complex Fimushkin, V. V; Kovalenko, A. D; Kutuzova, L. V ...
International journal of modern physics. Conference series,
2016, Letnik:
40, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The Source of Polarized Ions (SPI) of deuterons and protons with nearly resonant charge-exchange plasma ionizer is under construction at the LHEP, JINR. The
↑
D
+
(
↑
H
+
) current output of the ...source is expected to be at a level of 10
mA. The polarization will be up to 90% of the maximal vector (±1) for
↑
D
+
(
↑
H
+
) and tensor (
+
1,
−
2
) polarization for
↑
D
+
. Realization of the project is carried out in close cooperation with INR of the RAS (Moscow). The equipment available from the CIPIOS ion source (IUCF, Bloomington, USA) is partially used for the Dubna setup. The new source at the JINR NUCLOTRON accelerator facility will make it possible to increase the polarized deuteron beam intensity up to the level of 10
1
0
d
/pulse.
The main scientific goal of the AEGIS experiment (
Antimatter
Experiment:
Gravity,
Interferometry,
Spectroscopy) is the direct measurement of the Earth's gravitational acceleration
g on a beam of ...cold antihydrogen (
H
¯
). The production of an antihydrogen beam is achieved by a charge exchange reaction between Rydberg positronium and cold antiprotons. The
H
¯
beam will be accelerated up to a velocity of a few 100 m/s and the gravitational acceleration will be obtained by measuring the small vertical deflection of the beam (a few tens
μm) using a Moire' deflectometer.
Results of the analysis and upgrading of the high-voltage pulse generator circuit in the proton injector for operation with a 100-Hz pulse repetition rate are presented.
AEgIS (Antimatter experiment: gravity, interferometry, spectroscopy) is an experiment approved by CERN with the goal of studying antihydrogen physics. In AEgIS, antihydrogen will be produced by ...charge exchange reactions of cold antiprotons with positronium atoms excited in a Rydberg state (n > 20). In the first phase of the experiment, controlled acceleration by an electric field gradient (Stark effect) and subsequent measurement of free fall in a Moire deflectometer will allow a test of the weak equivalence principle. In a second phase, the antihydrogen will be slowed, confined, and laser-cooled to perform CPT studies and detailed spectroscopy. In the present work, after a general description of the experiment, the present status of advancement will be reviewed, with special attention to the production and excitation of positronium atoms.
The project assumes the design and construction of a universal high-intensity source of polarized deuterons (protons) using a charge-exchange plasma ionizer. The output
D
+
↑ (
H
+
↑) current of the ...source is expected to be at a level of 10 mA. The polarization will be up to 90% of the maximal vector (±1) for
D
+
↑ (
H
+
↑) and tensor (+1, −2) for
D
+
↑ polarization. Realization of the project is carried out in close cooperation with INR of the RAS (Moscow). The equipment available from the CIPIOS ion source (IUCF, Bloomington, USA) is partially used for the Dubna setup. The new source at the JINR Nuclotron accelerator facility will make it possible to increase the polarized deuteron beam intensity up to the level of 10
10
d/pulse. The first results of the source of polarized atoms testing are presented.
Considerable efforts have been made and are still being made to verify the validity of the principle of the equivalence of gravitational and inertial mass, one of the cornerstones of the classical ...theory of general relativity. Specific attempts at quantummechanical formulations of gravity allow for non-Newtonian contributions, which might lead to a difference in the gravitational force on matter and antimatter. While it is widely expected that the gravitational interaction is independent of the composition of bodies, this has only been tested for matter systems, but never yet for antimatter systems. By combining techniques from different fields, and relying on recent developments in the production of Positronium and ongoing work to laser-excite Positronium to Rydberg states, such a test with neutral antimatter has become feasible. The primary goal of the AEGIS experiment being built at the Antiproton Decelerator at CERN is to carry out the first direct measurement of the Earth‘s gravitational acceleration on antihydrogen by means of a classical Moiré deflectometer.
AEgIS (Antimatter experiment: gravity, interferometry, spectroscopy) is an experiment approved by CERN with the goal of studying antihydrogen physics. In AEgIS, antihydrogen will be produced by ...charge exchange reactions of cold antiprotons with positronium atoms excited in a Rydberg state (n > 20). In the first phase of the experiment, controlled acceleration by an electric field gradient (Stark effect) and subsequent measurement of free fall in a Moiré deflectometer will allow a test of the weak equivalence principle. In a second phase, the antihydrogen will be slowed, confined, and laser-cooled to perform CPT studies and detailed spectroscopy. In the present work, after a general description of the experiment, the present status of advancement will be reviewed, with special attention to the production and excitation of positronium atoms.
AEgIS (Expérience sur l'Antimatière: Gravité, Interférométrie, Spectrométrie) est une expérience approuvée par le CERN qui vise une étude globale de la physique de l'anti-hydrogène. Dans AEgIS, ...l'anti-hydrogène sera produit par des réactions d'échange de charges d'anti-protons froids avec des atomes de positronium excités dans un état de Rydberg (n > 20). Dans la première phase de l'expérience, l'accélération est contrôlée par un gradient de champ électrique (effet Stark); une mesure subséquente en chute libre dans un déflectomètre de Moiré nous fournira un test du principe d'équivalence faible. Dans une deuxième phase, l'anti-hydrogène sera ralenti, confiné et refroidi par laser pour des études de CPT et de spectroscopie de précision. Après une description générale de l'expérience, nous passons ici en revue l'état d'avancement des travaux en accordant une attention particulière à la production et l'excitation des atomes de positronium.
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