X X 50keV X X (I) 15 2 (I) K keV X 5.4 X X X X (SR) 33keV X 33keV X KEK-AR 33keV, photons/s X 10x10cm 2 33 shots/s 33keV X GeV X X X Compt
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1 Development of Compact Laser Super-Cavity for High Flux X-ray X Abstract We are developing Pulsed Laser Super-Cavity for compact high brightness X-ray generator based on Inverse Compton Scattering with about 50MeV electron beam. The laser Super-cavity increases the laser power and stably makes small laser beam size at the collision point with the electron beam. A Fabry-Perot cavity as the Super-cavity has been tested at the KEK-ATF (Accelerator Test Facility) and experiments on the increase of the enhancement factor demonstrated the stable control of 5µm waist size with 200W CW green laser. On the other hand, we are also developing the technique on the high brilliance X-ray generation. Recent results indicate the possibility of the application to K-edge digital subtraction angiography as the compact high flux X-ray source. Therefore, we have designed a compact 50MeV electron storage ring which has the circumference of 13.4m and enough energy acceptance (about 6%), and are developing a pulse stacking technology with 42cm Fabry-Perot cavity for quasi-cw laser Inverse Compton Scattering. X
2 X X 50keV X X (I) 15 2 (I) K keV X 5.4 X X X X (SR) 33keV X 33keV X KEK-AR 33keV, photons/s X 10x10cm 2 33 shots/s 33keV X GeV X X X Compton X X
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10 Parameter Value Circumference m Beam Energy 40-82MeV Betatron tunes ν x, ν y 3.187; Momentum Compaction ( ) x10-2 RF-acceptance >5% RF Frequency 714MHz RF voltage 0.4MV Harmonics number 36 Number of circulating electron bunches 2; 4; 8; 16; 32 Electron bunch charge 2nC Electron bunch current 45mA Stacked laser flash energy into optical cavity 0.5mJ Collision angle, degrees 10;150(170;30) Scattered photon energy(nd-yag laser 1.164eV, 2.328eV) keV Scattered photon intensity Up to /sec m ( Ring layout. BM, Q, S are the bending magnets, quadrupole and sextupole lenses, correspondingly; SO are the combined magnet with sextupole and octupole fields; Kicker is the injection kicker-magnet; RFC is the RF-cavity.) 2.5 S-band m Top-Up Injection
11 . (Left Figure:Horizontal(1) and vertical(2) amplitude functions at half lattice. At IP βx=4cm, βy=5cm, Right Figure:Linear(1) and second order(2) dispersions at half lattice.). Separatrix of longitudinal motion. Electron beam energy E0=82MeV, RF voltage Vrf=0.4MV. The first order momentum compaction factor α1=0.01.
12 X 1064nm 532nm 30 to 120keV 6 to 16keV 0.25keV to 1keV 53keV to 223keV X X 0.5% X 1% X. (Left: Interaction point region. Collision angles are 10 and and 30 Right: Final quadrupole doubles with optical cavities.) 5.
13
14 π KEK-ATF Group [1] X-band X Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [2] X Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [3] X-band X Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [4] Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [5] Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [6] Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan), M.Kuriki,
15 K.Hirano, R.Kuroda, M.Matsuda, T.Nakanishi, M.Nomura, S.Okumi, I.Sakai, M.Takano, N.Terunuma, K.Hasegawa, H.Hayano, J.Urakawa, Y.Yamazaki, M.Washio and ATF collaboration [7] Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [8] Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [9]. Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [10]. X Proceedings of the 28 th Linear Accelerator Meeting in Japan (July 30-Auguest 1, 2003, Tokai, Japan) [11]. RF The 14 th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003, [12]. Multi-bunch generation by Photo-cathode RF gun, The 14 th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003, M.Kuriki, K.Hirano, R.Kuroda, M.Matsuda, T.Nakanishi, M.Nomura, S.Okumi, I.Sakai, M.Takano, N.Terunuma, K.Hasegawa. H.Hayano, J.Urakawa, Y.Yamazaki, M.Washi, and ATF collaboration [13]. First Results of the Caesium Telluride Photo-Cathode for ATF RF-Gun, The 14 th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003, N.Terunuma, M.Kuriki, H.Hayano, J.Urakawa, M.Nomura, K.Hirano, Y.Yamazaki, M.Takano, T.Nakanishi, S.Okumi, M.Washio, R.Kuroda [14]. X X The 14 th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003 [15]. RF The 14 th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003
16 [16]. X X X The 14 th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003 [17]. X The 14 th Symposium on Accelerator Science and Technology, Tsukuba, Japan, November 2003 [18]. X III X RF [19]. X [20]. X RF [21]. X-band [22]. [23]. RF [24]. [25]. pp [26] pp [27]. "Achievement of Ultra-low Emittance Beam in the ATF Damping Ring", Physical Review Letters, Vol.92, No.5, (2004), Y.Honda, K.Kubo et al. [28]. "Polarimetry of Short-Pulse Gamma Rays Produced through Inverse Compton Scattering of Circularly Polarized Laser Beams", Physical Review Letters, Vol.91, No.16, (2003), M.Fukuda, T. Aoki, K. Dobashi, T. Hirose, T. Iimura, Y. Kurihara, T. Okugi, T. Omori,I. Sakai, J. Urakawa, and M.Washio [29]. "Measurements of electron beam emittance in the Accelerator Test Facility
17 damping ring operated in multibunch modes", PHYSICAL REVIEW SPECIAL TOPICS - ACCELERATORS AND BEAMS,VOLUME 6, (2003), Yosuke Honda, Noboru Sasao, Sakae Araki, Hitoshi Hayano, Yasuo Higashi, Kiyoshi Kubo, Toshiyuki Okugi, Takashi Taniguchi,Nobuhiro Terunuma, Junji Urakawa, Yoshio Yamazaki, Koichiro Hirano, Masahiro Nomura, Mikio Takano, and Hiroshi Sakai [30]. "Production of high brightness γ rays through backscattering of laser photons on high-energy electrons", Physical Review Special Topics-Accelerators and Beams, 6, (2003), I.Sakai, T.Aoki, K.Dobashi, M.Fukuda, A.Higurashi, T.Hirose, T.Iimura, Y.Kurihara, T.Okugi, T.Omori, J.Urakawa, M.Washio, and K.Yokoya [31]. Electron beam cooling by laser, to be published in Nucl. Instr. And Meth., J.Urakawa, K.Kubo, N.Terunuma, T.Taniguchi, Y.Yamazaki, K.Hirano, M.Nomura, I.Sakai, M.Takano, N.Sasao, Y.Honda, A.Noda, E.Bulyak, P.Gladkikh, A.Mytsykov, Z.Zelinsky, F.Zimmermann [32]. R&D Results on Laser-Compton photon beam generation, to be published as a report of AIP Conference Proceedings in 2004 for International Symposium on Portable Synchrotron Light Sources and Advanced Application, Junji Urakawa, Mashahiro Nomura and Mikio Takano
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