IBIC2013 - List of Authors (Tejima, M.)

Paper

Title

Page

Beam Diagnostics of SuperKEKB Damping Ring

53

H. Ikeda, A. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S. Kanaeda, K. Mori, M. Tejima, M. Tobiyama
KEK, Ibaraki, Japan

The KEKB accelerator ceased operation in 2010, and is being upgraded to SuperKEKB. Adopting low emittance and high current beams, the design luminosity is set at 40 times larger than that of KEKB. We are constructing a damping ring (DR) in order to achieve a low-emittance positron beam for injection. Turn-by-turn beam position monitors (BPMs), a transverse feedback system, a synchrotron radiation monitor (SRM), a DCCT, loss monitors using ion chambers, a bunch current monitor and a tune meter will be installed for beam diagnostics at the DR. An overview of the instrumentation of the DR will be presented in this paper.

TUCL2

A Development of High Sensitive Beam Profile Monitor using Multi-Screen

338

Y. Hashimoto, T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
T.M. Mitsuhashi, M. Tejima
KEK, Ibaraki, Japan
S. Otsu
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

The diagnostics of beam halo as well as beam core are very important for the regulation of the beam collimator. We have developed a monitor to observe two-dimensional beam profile with a large dynamic range. The monitor has been installed in 122m downstream from the beam collimator in 3-50 BT in the J-PARC. For measuring the beam core and the halo alternatively, the monitor has three kinds of screens. The first one is titanium foil OTR screen to measure a beam core, the second one is aluminum foil OTR screen having a hole (50 mm diameter) in the center, and the last one is a pair of alumina fluorescent screen with a separation of 80 mm in horizontal to observe the beam halo in surroundings. We designed an optical system based on the Offner optics for the observation of fluorescence and OTR lights. This optical system has an entrance aperture of 300 mm and it can cover the large opening angle (± 13.5 degree) of the OTR from 3GeV protons. A CID camera with an image intensifier (II) was use to observe the profile. We have succeeded to observe a profile of beam halo to 10^-6 order to the peak of beam core by using proton beams of 9.6 x 10¹² protons/pulse by this multi-screen scheme.

Slides TUCL2 [3.091 MB]

TUPC17

A Multiconductor Transmission Line Model for the BPMs at the 3-50 Beam Transport Line in J-PARC

403

T. Toyama, D.A. Arakara, M. Tejima
KEK, Ibaraki, Japan
K. Hanamura
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
Y. Hashimoto, K. Satou
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

We have developed an accurate and efficient analysis method with a multi-conductor transmission line model. This method combines the two-dimensional electrostatic analysis including beams in the transverse plane and the transmission line analysis in the longitudinal direction. The loads are also included in the boundary condition of the transmission line analysis. Calculation of 2D electrostatic fields can be easily performed with the boundary element method. Taking low frequency limit of the formula, we have obtained an accurate expectation of the BPMs of 200 mm diameter at the 3-50 Beam Transport Line in J-PARC.

Paper	Title	Page
MOPC05	Beam Diagnostics of SuperKEKB Damping Ring	53
	H. Ikeda, A. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S. Kanaeda, K. Mori, M. Tejima, M. Tobiyama KEK, Ibaraki, Japan
	The KEKB accelerator ceased operation in 2010, and is being upgraded to SuperKEKB. Adopting low emittance and high current beams, the design luminosity is set at 40 times larger than that of KEKB. We are constructing a damping ring (DR) in order to achieve a low-emittance positron beam for injection. Turn-by-turn beam position monitors (BPMs), a transverse feedback system, a synchrotron radiation monitor (SRM), a DCCT, loss monitors using ion chambers, a bunch current monitor and a tune meter will be installed for beam diagnostics at the DR. An overview of the instrumentation of the DR will be presented in this paper.

TUCL2	A Development of High Sensitive Beam Profile Monitor using Multi-Screen	338
	Y. Hashimoto, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan T.M. Mitsuhashi, M. Tejima KEK, Ibaraki, Japan S. Otsu Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
	The diagnostics of beam halo as well as beam core are very important for the regulation of the beam collimator. We have developed a monitor to observe two-dimensional beam profile with a large dynamic range. The monitor has been installed in 122m downstream from the beam collimator in 3-50 BT in the J-PARC. For measuring the beam core and the halo alternatively, the monitor has three kinds of screens. The first one is titanium foil OTR screen to measure a beam core, the second one is aluminum foil OTR screen having a hole (50 mm diameter) in the center, and the last one is a pair of alumina fluorescent screen with a separation of 80 mm in horizontal to observe the beam halo in surroundings. We designed an optical system based on the Offner optics for the observation of fluorescence and OTR lights. This optical system has an entrance aperture of 300 mm and it can cover the large opening angle (± 13.5 degree) of the OTR from 3GeV protons. A CID camera with an image intensifier (II) was use to observe the profile. We have succeeded to observe a profile of beam halo to 10^-6 order to the peak of beam core by using proton beams of 9.6 x 10¹² protons/pulse by this multi-screen scheme.
	Slides TUCL2 [3.091 MB]

TUPC17	A Multiconductor Transmission Line Model for the BPMs at the 3-50 Beam Transport Line in J-PARC	403
	T. Toyama, D.A. Arakara, M. Tejima KEK, Ibaraki, Japan K. Hanamura Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan Y. Hashimoto, K. Satou J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	We have developed an accurate and efficient analysis method with a multi-conductor transmission line model. This method combines the two-dimensional electrostatic analysis including beams in the transverse plane and the transmission line analysis in the longitudinal direction. The loads are also included in the boundary condition of the transmission line analysis. Calculation of 2D electrostatic fields can be easily performed with the boundary element method. Taking low frequency limit of the formula, we have obtained an accurate expectation of the BPMs of 200 mm diameter at the 3-50 Beam Transport Line in J-PARC.