COOL2015 - List of Keywords (dipole)

Paper	Title	Other Keywords	Page
MOPF08	Secondary Electron Measurements at the HIM Electron Cooler Test Set-Up	electron, simulation, operation, optics	48
	M.W. Bruker, K. Aulenbacher, J. Dietrich, A. Hofmann, T. Weilbach HIM, Mainz, Germany
	The planned advances in electron cooling technology aimed at improving the operation of future hadron storage rings include an increase in electron beam current and acceleration voltage. A test set-up has been built at Helmholtz-Insitut Mainz (HIM) to optimize the recuperation efficiency of such high-current beams in energy recovery operation, requiring a thorough understanding of their interaction with external electric and magnetic fields, such as those found in a Wien velocity filter. Beam diagnostics are carried out using a BPM and current-sensing scraper electrodes. At present, the set-up can be successfully operated at U=17 kV, I=600 mA, showing a relative secondary electron current of about 2·10^-4. We present the current state of the project and its objectives for the foreseeable future.
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FRYAUD01	Commissioning of the Rare-RI Ring at RIKEN RI Beam Factory	kicker, injection, pick-up, detector	182
	Y. Yamaguchi, Y. Abe RIKEN, Saitama, Japan F. Suzaki, M. Wakasugi RIKEN Nishina Center, Wako, Japan
	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
	Slides FRYAUD01 [16.252 MB]
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Paper

Title

Other Keywords

Page

MOPF08

Secondary Electron Measurements at the HIM Electron Cooler Test Set-Up

electron, simulation, operation, optics

48

M.W. Bruker, K. Aulenbacher, J. Dietrich, A. Hofmann, T. Weilbach
HIM, Mainz, Germany

The planned advances in electron cooling technology aimed at improving the operation of future hadron storage rings include an increase in electron beam current and acceleration voltage. A test set-up has been built at Helmholtz-Insitut Mainz (HIM) to optimize the recuperation efficiency of such high-current beams in energy recovery operation, requiring a thorough understanding of their interaction with external electric and magnetic fields, such as those found in a Wien velocity filter. Beam diagnostics are carried out using a BPM and current-sensing scraper electrodes. At present, the set-up can be successfully operated at U=17 kV, I=600 mA, showing a relative secondary electron current of about 2·10^-4. We present the current state of the project and its objectives for the foreseeable future.

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FRYAUD01

Commissioning of the Rare-RI Ring at RIKEN RI Beam Factory

kicker, injection, pick-up, detector

182

Y. Yamaguchi, Y. Abe
RIKEN, Saitama, Japan
F. Suzaki, M. Wakasugi
RIKEN Nishina Center, Wako, Japan

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

Slides FRYAUD01 [16.252 MB]

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