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MOZAUD03 |
Current Status of Electron and RI Collision Project at RIKEN | |
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| The SCRIT electron scattering facility has been constructed at RIKEN RI beam factory. This is aimed at determination of charge density distribution for short-lived unstable nuclei. The facility consists of an electron accelerator (RTM), an electron storage ring (SR2) equipped with the SCRIT device, an ISOL system (ERIS), and a high-resolution magnetic spectrometer (WiSES). Radio-active isotope ions, which are produced at the ERIS, are trapped in the SCRIT device and collide with the accumulated electron beam in SR2. The angular distribution of elastically scattered electrons is measured using the WiSES detector. The facility is now under comprehensive test using stable isotopes, and the preparation of experiment for unstable nuclei is now in process. Current status of the facility and recent test experiments are presented. | ||
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Slides MOZAUD03 [11.589 MB] | |
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| FRYAUD01 | Commissioning of the Rare-RI Ring at RIKEN RI Beam Factory | 182 |
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The Rare-RI Ring (R3) is an isochronous storage ring to measure masses of short-lived rare nuclei by using a TOF method*. The expected precision of the measured mass will be of the order of ppm. A commissioning run using a 78Kr beam was performed in June 2015 and basic performances of R3 were verified. We succeeded in injecting a particle, which was randomly produced from a DC beam from cyclotrons, into the R3 individually** with a fast kicker system***, and in extracting the particle from the R3 1 ms after the injection. We measured TOF of the 78Kr particles between the entrance and the exit of the R3 to check the isochronism. Through the first-order adjustment with trim-coils imbedded on the dipole magnets of the R3, the isochronism on the 10-ppm order was achieved for the momentum spread of ±0.2 %. Higher-order adjustment employed in future will lead us to the isochronism on the order of ppm. In addition, we confirmed that a resonance-type Schottky pick-up successfully acquired the revolution frequency information of one particle in a storage mode. In this conference, the technical aspects of the R3 and prospects from the results of the beam commissioning will be discussed.
* A. Ozawa, et al., Prog. Theor. Exp. Phys. 2012, 03C009 ** I. Meshkov, et. al., Proceedings of EPAC 2004, Lucerne, Switzerland. *** Y. Yamaguchi, et al., Proceedings of STORI'14, in press |
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Slides FRYAUD01 [16.252 MB] | |
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