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5. Emittance measurement for 200keV-electron beam extracted from NEA-GaAs photocathode using a pepper pot method

Author

Yamamoto, N., primary, Yamamoto, M., additional, Nakanishi, T., additional, Okumi, S., additional, Furuta, F., additional, Nishitani, T., additional, Miyamoto, N., additional, Kuwahara, M., additional, Naniwa, K., additional, Kobayakawa, H., additional, Takashima, Y., additional, Kuriki, M., additional, Matsumoto, H., additional, Urakawa, J., additional, and Yoshioka, M., additional

Published
2004
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7. Deep Inelastic Scattering of Polarized Electrons by Polarized Protons

Author

Alguard, M. J., primary, Ash, W. W., additional, Baum, G., additional, Clendenin, J. E., additional, Cooper, P. S., additional, Coward, D. H., additional, Ehrlich, R. D., additional, Etkin, A., additional, Hughes, V. W., additional, Kobayakawa, H., additional, Kondo, K., additional, Lubell, M. S., additional, Miller, R. H., additional, Palmer, D. A., additional, Raith, W., additional, Sasao, N., additional, Schüler, K. P., additional, Sherden, D. J., additional, Sinclair, C. K., additional, and Souder, P. A., additional

Published
1992
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8. Experimental Test of Special Relativity from a High-γ Electron g – 2 Measurement

Author

Cooper, P. S., primary, Alguard, M. J., additional, Ehrlich, R. D., additional, Hughes, V. W., additional, Kobayakawa, H., additional, Ladish, J. S., additional, Lubell, M. S., additional, Sasao, N., additional, Schüler, K. P., additional, Souder, P. A., additional, Coward, D. H., additional, Miller, R. H., additional, Prescott, C. Y., additional, Sherden, D. J., additional, Sinclair, C. K., additional, Baum, G., additional, Raith, W., additional, and Kondo, K., additional

Published
1992
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10. Highly polarized electrons from GaAs–GaAsP and InGaAs–AlGaAs strained-layer superlattice photocathodes.

Author

Nishitani, T., Nakanishi, T., Yamamoto, M., Okumi, S., Furuta, F., Miyamoto, M., Kuwahara, M., Yamamoto, N., Naniwa, K., Watanabe, O., Takeda, Y., Kobayakawa, H., Takashima, Y., Horinaka, H., Matsuyama, T., Togawa, K., Saka, T., Tawada, M., Omori, T., and Kurihara, Y.

Subjects
PHOTOCATHODES, CATHODES, FIELD emission cathodes, GALLIUM arsenide semiconductors, SEMICONDUCTORS, SUPERLATTICES
Abstract

GaAs–GaAsP and InGaAs–AlGaAs strained-layer superlattice photocathodes are presented as emission sources for highly polarized electron beams. The GaAs–GaAsP cathode achieved a maximum polarization of 92(±6)% with a quantum efficiency of 0.5%, while the InGaAs–AlGaAs cathode provides a higher quantum efficiency (0.7%) but a lower polarization [77(±5)%]. Criteria for achieving high polarization using superlattice photocathodes are discussed based on experimental spin-resolved quantum efficiency spectra. [ABSTRACT FROM AUTHOR]

Published
2005
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12. A case of idiopathic thrombocytopenic purpura treated by plasmapheresis and splenectomy

Author

Atuko Sasaki, Takuya Kishida, Yoshinori Yasui, Kobayakawa H, Yoshimasa Asai, Makoto Harima, Shigeru Kishiguchi, Tatuo Iseki, Takahisa Yamane, Shoichi Nishio, and Takeshi Inoue

Subjects
medicine.medical_specialty, business.industry, medicine.medical_treatment, Splenectomy, medicine, Plasmapheresis, business, medicine.disease, Thrombocytopenic purpura, Surgery
Abstract

今回我々は種々の治療を試みたが, 治療に抵抗性で全身の著明な出血傾向を呈したITPの患者にtherapeutic plasmapheresis (TPP) による治療を行い, 血小板を増加させた上で摘脾を施行し, 持続的な血小板数の増加を認めたので報告する.症例は23歳, 男性, 特別な誘因なく歯肉出血, 全身紫斑が認められ, 血小板数0.1×104/mm3と著明に減少していたため, 濃厚血小板液20パックずつ3日間輸血, ハイドロコルチゾン500mg, プレドニゾロン60mg, メチルプレドニゾロン1gの投与をうけたが血小板数は0.1×104/mm3と効果なく, 入院となった.入院時, 鼻出血少量, 歯肉出血, 血尿, 黒褐色便, 全身に散在性の点状出血, 紫斑が多数認められるなど, 出血傾向が著明であり, 抗血小板抗体は陰性であったが, PA-lgG 390.1ng/107 cellsと明らかに上昇していた. また, 骨髄穿刺所見から, megakaryocyteの増加が認められたため, ITPと診断した. メチルプレドニゾロン大量療法として, メチルプレドニゾロン1,000mg/dayから漸次減量して投与を行い, γ-グロブリン大量療法として乾燥pH4処理ヒト免疫グロブリン2.5g×20V静注するも血小板数は最高1.2×104/mm3までしか改善せず, 出血傾向が持続したため, エンドキサン1,000mg/day投与を行ったが, 症状改善が得られないため, TPP施行に踏切った. その後血小板の上昇傾向が認められ, 計6回施行した. その間血小板数のピーク値は10.4×104/mm3であったが, 再び血小板数減少傾向となったため, 血小板数6.1×104/mm3の状態で脾臓摘出術を施行したところ, 血小板は著明に増加し血小板67.2×104/mm3となったため, 退院となった.

Published
1991
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13. Treatment of bladder tumors and benign prostatic hyperplasia with a new TUR system using physiological saline as perfusate

Author

Takahisa Adachi, Masahide Matsuyama, Kiyoaki Funao, Yoshiaki Takemoto, Kobayakawa H, Tatsuya Nakatani, K. Tsuchida, and Rikio Yoshimura

Subjects
Male, medicine.medical_specialty, medicine.medical_treatment, Urology, Prostatic Hyperplasia, Sodium Chloride, medicine, Humans, Saline, Electrodes, Transurethral resection of the prostate, Aged, Aged, 80 and over, business.industry, Transurethral Resection of Prostate, Hyperplasia, Vascular surgery, Middle Aged, medicine.disease, Surgery, Cardiac surgery, Treatment Outcome, Urinary Bladder Neoplasms, Cardiothoracic surgery, Obturator nerve, Female, business, Abdominal surgery
Abstract

This article presents a new transurethral resection (TUR) system for use in endoscopic surgery. By using an electroconductive solution (physiological saline) as the perfusate in lieu of conventional non-electroconductive solution (Uromatic), additional anesthesia (e.g., obturator nerve blocking) is not required. The new TUR is carried out in an electroconductive solution such as saline, and because radiofrequency current flows from the resecting electrode through the perfusate to the outer sheath, no counter-electrode is needed. We have treated both bladder tumor and benign prostatic hyperplasia cases with this new system. Surgery was safely performed in all TUR-bt cases without requiring obturator nerve blocking. During both TUR-bt and transurethral resection of the prostate (TUR-P) using this system, tissue resection and coagulation equivalents were similar to the conventional TUR system. In previous TUR, preoperative obturator nerve blocking was necessary, and in some cases, incomplete blocking or complications occurred. When physiological saline is used as the perfusate, blood electrolyte levels are not greatly changed, even after extensive resection of the bladder wall; as a result, this new system is also cost effective because physiological saline is less expensive than non-electroconductive solutions and requires no counter-electrode. Thus, in comparison with conventional TUR, this new system is both significantly safer and more cost effective.

Published
2006

18. RECENT PES PHOTOCATHODE R&D AT NAGOYA UNIVERSITY

Author

KUWAHARA, M., primary, NAKANISHI, T., additional, OKUMI, S., additional, YAMAMOTO, M., additional, FURUTA, F., additional, MIYAMOTO, M., additional, YAMAMOTO, N., additional, NANIWA, K., additional, YASUI, K., additional, NISHITANI, T., additional, WATANABE, O., additional, TAKEDA, Y., additional, KOBAYAKAWA, H., additional, TAKASHIMA, Y., additional, and TOGAWA, K., additional

Published
2005
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21. Basic R&D Studies for Lower Emittance Polarized Electron Guns.

Author

Suzuki, C., Nakanishi, T., Okumi, S., Furuta, F., Wada, K., Nishitani, T., Yamamoto, M., Hirose, T., Kuwahara, M., Mizuno, R., Yamamoto, N., Matsumoto, H., Yoshioka, M., Horinaka, H., Matsuyama, T., and Kobayakawa, H.

Subjects
ELECTRON beams, ELECTRON gun, POLARIZED electrons
Abstract

In order to produce the lower emittance electron beam, the higher field gradient must be used for the gun. From this point of view, we try to develop both of a polarized DC-gun and RF-gun. In case of a 200 keV polarized DC-gun at Nagoya University, the accelerating gradient at the photocathode surface was designed to be 3 MV/m, and the dark current emitted from the SUS electrodes was suppressed below 1 nA. To increase the gradient, we tested the property of pure Titanium as a new electrode material. The tested electrode showed small dark current (∼1 nA) even at field gradient of 88 MV/m, which is as twice as higher than that of SUS electrode. Concerning the feasibility of a polarized RF-gun, it seems difficult for the NEA surface to survive in high field gradient of 100 MV/m. Therefore, we proposed a new type of polarized electron source using two-photon excitation method, for which it is not necessary to use the NEA surface to extract electrons into vacuum. For this method, the polarization higher than 90 % was already demonstrated by the photoluminescence measurement using the bulk GaAs crystal. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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22. Polarized electron source for Japan Linear Collider.

Author

Togawa, K., Nakanishi, T., Okumi, S., Suzuki, C., Furuta, F., Wada, K., Nishitani, T., Yamamoto, M., Kobayakawa, H., Takeda, Y., Takashima, Y., Sugiyama, H., Watanabe, O., Kurihara, Y., Matsumoto, H., Omori, T., Takeuchi, Y., Yoshioka, M., Horinaka, H., and Matsuyama, T.

Subjects
POLARIZED electrons, PHOTOCATHODES
Abstract

Our collaboration group has been conducting the R&D works on the polarized electron source for Japan Linear Collider. The experimental results to produce the high-intensity multi-bunch beam from the superlattice photocathodes are summarized in this report. [ABSTRACT FROM AUTHOR]

Published
2001

23. Reconstruction for the brilliance-upgrading project of the Photon Factory storage ring

Author

Katoh, M., primary, Hori, Y., additional, Kobayashi, Y., additional, Sakanaka, S., additional, Izawa, M., additional, Haga, K., additional, Honda, T., additional, Mitsuhashi, T., additional, Obina, T., additional, Pak, C. O., additional, Ohmi, K., additional, Tsuchiya, K., additional, Kanaya, N., additional, Ueda, A., additional, Tadano, M., additional, Takiyama, Y., additional, Asaoka, S., additional, Nogami, T., additional, Shioya, T., additional, Mishina, A., additional, Sato, Y., additional, Tokumoto, S., additional, Takahashi, T., additional, Kasuga, T., additional, Maezawa, H., additional, Kobayashi, M., additional, and Kobayakawa, H., additional

Published
1998
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26. Worldwide census of synchrotron radiation facilities.

Author

Kobayakawa, H. and Huke, K.

Subjects
*SYNCHROTRON radiation sources, *PHOTONS
Abstract

Information has been compiled on the parameters of synchrotron radiation sources in twelve countries, including almost forty individual facilities. The data includes the energy of the beam, the characteristic photon energy; ∈[sub C], of the bending magnet radiation, and details of the beam itself, and of beamlines, experimental stations, insertion devices, and photon energies. [ABSTRACT FROM AUTHOR]

Published
1989
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29. Reduction of field emission current from stainless steel and copper surface.

Author

Suzuki, C., Nakanishi, T., Okumi, S., Gotoh, T., Togawa, K., Furuta, F., Wada, K., Nishitani, T., Yamamoto, M., Watanabe, J., Kurahashi, S., Matsumoto, H., Yoshioka, M., Asano, K., and Kobayakawa, H.

Subjects
FIELD emission, STAINLESS steel, COPPER surfaces
Abstract

The field emission dark currents from stainless steel and copper electrodes were measured under DC high field gradient condition. The stainless steel electrode was made from special material called Clean-Z and was polished by electro-chemical buffing. The electrodes achieved 34MV/m with the dark current of 90pA at the gap separation of 1 mm. The copper electrodes were treated by four different types of surface cleaning procedures. The best results were obtained by using the electrode rinsed with ultra-pure water after diamond turning. A field gradient of 47MV/m was achieved with dark current at the level of 1nA, and the microscopic field enhancement factor was estimated to be a very low value of 56. The dark current from this electrode was dependent only on the field gradient at the cathode and not affected by the total voltage applied to the gap. This fact suggests that the surface fabricated by diamond turning method with ultra-pure water rinsing creates few secondary ions by the electron bombardment. [ABSTRACT FROM AUTHOR]

Published
2001

30. Test of cesium telluride photocathode as a feasibility study on polarized RF-gun.

Author

Furuta, F., Sugiyama, H., Nakanishi, T., Okumi, S., Togowa, K., Suzuki, C., Wada, K., Yamaoto, M., Nishitani, T., Watanabe, J., Kurahashi, S., Miyamoto, M., Kuwahara, M., Mizuno, R., Hirose, T., Kimura, K., Kobayakawa, H., Takashima, Y., Yoshioka, M., and Matsumoto, H.

Subjects
LINEAR accelerators, POLARIZATION (Nuclear physics), ELECTRON-positron interactions
Abstract

Our collaboration group have continued to develop the polarized DC-gun system for future electron-positron linear colliders. In parallel, the feasibility study to develop the polarized RF-gun is planned. As the first step, the test of Cs[sub 2]Te photocathode was performed. [ABSTRACT FROM AUTHOR]

Published
2001

31. Development of spin polarized electron photocathodes: GaAs-GaAsP superlattice and GaAs-AlGaAs superlattice with DBR.

Author

Nishitani, T., Watanabe, O., Nakanishi, T., Okumi, S., Togawa, K., Suzuki, C., Furuta, F., Wada, K., Yamamoto, M., Watanabe, J., Kurahashi, S., Miyamoto, M., Kobayakawa, H., Takeda, Y., Saka, T., Kato, K., Bakarov, A. K., Jaroshevich, A. S., Scheibler, H. E., and Toropov, A.I.

Subjects
PHOTOCATHODES, SUPERLATTICES, ROTATIONAL motion
Abstract

We have tested two kinds of spin-polarized electron photocathodes, the GaAs-GaAsP strained layer superlattice and the GaAs-AlGaAs superlattice with distributed Bragg reflector. The experimental results of these photocathodes are briefly reported. [ABSTRACT FROM AUTHOR]

Published
2001

32. Fabrication of GaAs/GaAsP superlattice photocathode.

Author

Watanabe, O., Nishitani, T., Togawa, K., Takashima, Y., Nakanishi, T., Takeda, Y., and Kobayakawa, H.

Subjects
SUPERLATTICES, PHOTOCATHODES
Abstract

Several samples of GaAs/GaAsP superlattice were fabricated using a method of the Metalorganic Chemical Vapor Deposition (MOCVD) growth for the purpose of investigating various properties as a photocathode of spin-polarized electron sources. The MOCVD growth is easy to control in comparison with the Molecular Beam Epitaxial (MBE) growth in the fabrication procedure of the GaAs/GaAsP superlattices. We used Tertiarybutylarsine (TBAs) and Tertiarybutylphophine (TBP) as V-group sources to make the samples. It is for this reason that the toxicity of TBAs and TBP is lower than that of arsine (AsH[sub 3]) and phosphine (PH[sub 3]) which are commonly used, and the pyrolysis temperature for TBAs and TBP is lower than that for AsH[sub 3] and PH[sub 3]. A large spin-polarization exceeding 90% was observed using the sample made in this method. We also obtained large quantum efficiencies of approximately 0.4% in the wavelength range from 760nm to 780nm. [ABSTRACT FROM AUTHOR]

Published
2001

33. CLINICAL STUDY OF STAGE A PROSTATIC CANCER

Author

Asakawa M, Khosuke Kakinoki, Tatuo Iseki, Masanobu Maekawa, Kobayakawa H, and Ryoji Yasumoto

Subjects
Clinical study, Oncology, medicine.medical_specialty, Pathology, Text mining, business.industry, Urology, Internal medicine, medicine, Cancer, Stage (cooking), business, medicine.disease
Published
1988
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35. Photon Factory: Status of Storage Ring.

Author

Huke, K., Kajiura, N., Kamiya, Y., Kanaya, N., Katsura, T., Kihara, M., Kitamura, H., Kobayakawa, H., Kobayashi, M., Koide, T., Pak, C. O., Sato, S., Shibata, S., Yamakawa, T., and Yamazaki, Y.

Published
1983
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36. Progress in R&D efforts on the energy recovery linac in Japan

Author

Sakanaka, S., Agoh, T., Enomoto, A., Fukuda, S., Furukawa, K., Furuya, T., Haga, K., Harada, K., Hiramatsu, S., Honda Tohru, Honda, Y., Hosoyama, K., Izawa, M., Kako, E., Kasuga, T., Kawata, H., Kikuchi, M., Kobayakawa, H., Kobayashi, Y., Matsumoto, T., Michizono, S., Mitsuhashi, T., Miura, T., Miyajima, T., Muto, T., Nagahashi, S., Naito, T., Nogami, T., Noguchi, S., Obina, T., Ohsawa, S., Ozaki, T., Sasaki, H., Sasaki, S., Satoh, K., Satoh, M., Shimada, M., Shioya, T., Shishido, T., Suwada, T., Takahashi, T., Tanimoto, Y., Tawada, M., Tobiyama, M., Tsuchiya, K., Uchiyama, T., Umemori, K., Yamamoto, S., Hajima, R., Iijima, H., Kikuzawa, N., Minehara, E. J., Nagai, R., Nishimori, N., Sawamura, M., Nakamura, N., Ishii, A., Ito, I., Kawasaki, T., Kudoh, H., Sakai, H., Shibuya, T., Shinoe, K., Shiraga, T., Takaki, H., Katoh, M., Kuriki, M., Yoshitomi, D., Torizuka, K., and Hanaki, H.

41. A cryostat with a large cooling power for polarized target

Author

Fukushima, M., primary, Horikawa, N., additional, Kajikawa, R., additional, Kobayakawa, H., additional, Mori, K., additional, Nakanishi, T., additional, Okumi, S., additional, Pak, C. O., additional, Suzuki, S., additional, Ohshima, T., additional, Daigo, M., additional, Matsuda, T., additional, and Tokuda, N., additional

Published
1976
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44. High-precision measurement of π−p elastic scattering in a wide angular range at incident momenta between 2.06 and 3.48 GeV/c

Author

Terada, S., primary, Sumi, Y., additional, Kadota, S., additional, Endo, I., additional, Baba, K., additional, Tauchi, T., additional, Suzuki, S., additional, Shimomura, T., additional, Park, C.O., additional, Ohashi, Y., additional, Nakanishi, T., additional, Mori, K., additional, Miyamoto, A., additional, Matsui, T., additional, Kobayakawa, H., additional, Kajikawa, R., additional, Iwata, S., additional, Fukushima, M., additional, Tokuda, N., additional, Takeuchi, T., additional, Tsuru, T., additional, and Amako, K., additional

Published
1980
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46. Polarized Electron-Electron Scattering at GeV Energies

Author

Cooper, P. S., primary, Alguard, M. J., additional, Ehrlich, R. D., additional, Hughes, V. W., additional, Kobayakawa, H., additional, Ladish, J. S., additional, Lubell, M. S., additional, Sasao, N., additional, Schüler, K. P., additional, Souder, P. A., additional, Baum, G., additional, Raith, W., additional, Kondo, K., additional, Coward, D. H., additional, Miller, R. H., additional, Prescott, C. Y., additional, Sherden, D. J., additional, and Sinclair, C. K., additional

Published
1975
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47. Backward polarization of π−p elastic scattering from 2.22 to 3.50 GeV/c

Author

Fukushima, M., primary, Iwata, S., additional, Kajikawa, R., additional, Kobayakawa, H., additional, Matsui, T., additional, Miyamoto, A., additional, Mori, K., additional, Nakanishi, T., additional, Ohashi, Y., additional, Pak, C.O., additional, Shimomura, T., additional, Suzuki, S., additional, Tauchi, T., additional, Baba, K., additional, Endo, I., additional, Kadota, S., additional, Sumi, Y., additional, Terada, S., additional, Takeuchi, Y., additional, Tokuda, N., additional, Amako, K., additional, and Tsuru, T., additional

Published
1980
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48. Elastic Scattering of Polarized Electrons by Polarized Protons

Author

Alguard, M. J., primary, Ash, W. W., additional, Baum, G., additional, Clendenin, J. E., additional, Cooper, P. S., additional, Coward, D. H., additional, Ehrlich, R. D., additional, Etkin, A., additional, Hughes, V. W., additional, Kobayakawa, H., additional, Kondo, K., additional, Lubell, M. S., additional, Miller, R. H., additional, Palmer, D. A., additional, Raith, W., additional, Sasao, N., additional, Schüler, K. P., additional, Sherden, D. J., additional, Sinclair, C. K., additional, and Souder, P. A., additional

Published
1976
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50. Deep Inelastic Scattering of Polarized Electrons by Polarized Protons

Author

Alguard, M. J., primary, Ash, W. W., additional, Baum, G., additional, Clendenin, J. E., additional, Cooper, P. S., additional, Coward, D. H., additional, Ehrlich, R. D., additional, Etkin, A., additional, Hughes, V. W., additional, Kobayakawa, H., additional, Kondo, K., additional, Lubell, M. S., additional, Miller, R. H., additional, Palmer, D. A., additional, Raith, W., additional, Sasao, N., additional, Schüler, K. P., additional, Sherden, D. J., additional, Sinclair, C. K., additional, and Souder, P. A., additional

Published
1976
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