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Brilliance vs Emittance. Brilliance is estimated at 10 keV, ofwhich diraction limit corresponds to 10 pm.rad. Electronenergy of 6 GeV, stored current of 100 mA, coupling ratio of0.01, energy spread of 0.12÷, and betatron functions of 1.0
meter in horizontal and vertical axes are assumed as an exam­ple.

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Table 1

Lattice functions of 6­bend lattice.

Major parameters of newly designed ring

bend lattice ÆÄÎêé eBX\¢ðµÄ¢éB±ê

Lattice Type6­bend achromatÍCeZiS48ZÌ¤¿C4 ÂÌ·¼üð­44Z

Ring Circumference

1435.9488 m

jÉzu³êéÎüd¥ÎÌª 2 Â¸Â

Beam Energy

6 GeV

Natural EmittanceÞ

67 pm.rad

Relative Energy Spread

0.096÷

Beta at Normal Straight (H/V)

1.0 m/1.2 mBending Field

0.7 TéêèÌðð½·jCÎüpª¬³­ÈÁ

Max. Quadrupole Strength B
L/(Br)

0.84 m|1ÄG~b^XÍÇ­ÈéªCr[_Ci~NXÉÁ¬Max. Sextupole Strength B
L/(Br)

120 m|2Ó¡ÅéÆ¢¤éB]ÁÄCeÎüd¥ÎÍ 1 ü360xð 2~44ÅÁ½ñ 4 x¸Âdqr[ðÎü³¹éB®(1)É¨¯é u Í±ÌÎüpÅ

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ÖªíHwÌÏ_©çïÕxª}¬É·±ÆªmçêÄ¢éiãqjBäXÍCãqÌu«EðvÌºCeZÉ 6ÂÌÎüd¥Îðzu·é 6_bend lattice ðSÉ¢ðÞNatural emittance ÆÍCJbvOðl¶µÈ¢G~b^XBDamping wiggler â»Ì¼ÌÇÁuÌøÊÍüÁÄ¢È¢BißÄ¢é6,7)BFig. 2 ÍC6_bend lattice ðfUCµ½ÊÅèC1ZàÉ¨¯éeBXÖð\µÄ¢éB±ÌeBXÍC®(1)É¨¯éW C ðÅ¬É·é TME (Theoreti­cal Minimum Emittance) ^ªx[XÉÈÁÄ¢éBÈãÌæ¤ÉC®(1)ÌEÓÌSÄÌöqðá¸³¹é±ÆÅCÅIIÉdqG~b^XÍ e67 pmÉrad ÉB·é±ÆÉÈéB±êÍC»ÝÌ SPring­8 ÌG~b^
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Brilliance of the current SPring­8 and the newly designedring, calculated by SPECTRA8).

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Fig. 4Flux of the current SPring­8 and the newly designed ring.
For bending magnets (BM), a horizontal angular acceptanceof 0.1 mrad is assumed. Calculated by SPECTRA8).

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Fig. 5

Dynamic apertures of the 6­bend lattice. Left: (Red) on momentum, (Blue) 1÷ o momentum. Right: (Dashed)without magnet alignment error, (Solid) with random sextupole alignment errors of }10 mm7).

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c_àø«±«s¢½¢BÀÛC{ÅÐîµ½fUCÍC»ÝÌ SPring­8 æèàÁïdÍð}§µÈªç1000{ÌPxð¶ÞdlÉÈÁÄ¢éBPxÌòôIüãÍC
imTCGXðÍ¶ßÆ·éæsIÈ¤ÖÌv£¾¯ÅÈ­CÀ±ÔZkÌÏ_©çÀ±Ì^]RXgªÀ¿IÉí¸Å«éÆ¢¤·ªéBXÈéÁïdÍ}§ÌÂ\«ÉÂ¢ÄàCùÉ¢ðJnµÄ¢éBúËõ Sept. 2011 Vol.24 No.5  271 ÒÐî nMGà PxõÈw¤Z^[ Á¬íòå ¤õE­mail: twatanabespring8.or.jp
êåFr[¨wCÁ¬íÈwmªðn1996Nåwåw@Hwn¤ÈÞCHwmB1996NåwèC2003NubNwu§¤¨å Research Associate, 2005N¯¤ NSLS å Assistant Scientist ðoÄC2008Næè»EBSPring­8 Upgrade Plan
Takahiro WATANABE

SPring­8 Upgrade Plan Working Group (RIKEN and JASRI/SPring­8),
Kouto 1_1_1, Sayo Hyogo 679_5198

Abstract Since the SPring­8 was commissioned in 1997, high brightness X­rays have been provided towide varieties of users from fundamental sciences to industrial purposes. Now the upgrade of the light source
is being planned, aiming at so­called an ultimate storage ring where an electron emittance reaches the dirac­tion limit in X­ray region. In the report, we review the outline and the current status of the SPring­8 upgradeplan.

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