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92  úËõ March 2012 Vol.25 No.2

[^Ì X üðp¢½õwACgi\z¸®«nß½ XFEL {Ý SACLA ¡ r[R~bVjOÉõ¹«\x10 mm)12) Cdqr[ðp¢½r[x[XhA
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Fig. 5

[^ðp¢½ACgÍC^[QbgÌsz[ðQÆ X üÉÎµC20 mm Ì¸xÅÀ×é±Prole of undulator radiation measured by the developed
MPCCD installed in the optical hutch. The radiation is
monochromatized to 10 keV X­rays by a double crystal
monochromator.

ÆªÅ«½àÌÌCsz[ÆACgÎÛ@íÆÌÎÊuîñiOÉvªµÄõµÄ¨­×«f[^jÌ¸xs«ÅpÅ«È©Á½B±Ì´öÍOÌÎÊd) AWuvªðåCÅsÁ½±ÆÉNöµÄ¢éÆl¦çêÄ[^º¬Ì BPM ÌItZbgèidqr[gpj¢éB±Ì½ßCBBA Í 3 ³ÊuªÊÉîÃ­AC

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úËõ March 2012 Vol.25 No.2  93

Table 1

Achieved SASE FEL performanceÉÎµCpXGlM[ðpXÅèZµ½½

Sub­mJlZ1 ÅÏlÉä×{Í­C»óÅà10 GW Í´¦Ä¢éÆ

Electron Beam Pulse DurationÞte

30`70 fs (FWHM)è³êéB

Intensity FluctuationÞ

10`20÷

Spatial Coherence

Nearly full

Repetition Rate

10 Hz (Max. 60 Hz)

Pulse EnergyÞEp

Þ
Achieved values depend on the lasing wavelength[U[Ì^]óµÍ»óÌlÉÈÁÄ¢éB^]
Ì½ÏgbvpxÍC10 Hz ÌJèÔµÅªÉ 1 ñöxÅ

êÎ30`40

éB[U[g·ª·­ÈéiGlM[ªá­ÈéjÙÇ RF oÍ@íÌgpª¸èCgbvpxÍ¸­·éBêûÅC[U[ÌJèÔµðâ·ÉÂêÄCPÊÔ

½èÌgbvÍÁ·éBgbvpxðá­}¦é§ê©çC[U[ÌJèÔµð10 Hz ©çX^[g·éªCÅ«é¾¯¬â©ÉRf
BVjOðißCÝvÚWlÌ60 Hz Öø«ã°é\èÅéB»óÅÍCRF oÍ@íÌgbv©ç[U[^]ÌÄJÉÍC¨¨æ» 5 ªðv·éBAãÌ[U[ÌÄ»«Í­CgbvÌ[U[Á«ÖÌe¿ÍÈ¢ªC[U[AÜÅÌÔðÅ¬»·éæ¤¡ãAèÌø¦»ðißéB[U[^]ÉÀÑÌ
Åådqr[GlM[Í8.3 GeV ÅééªC3 ©çÌ[U[^]ÅÍCguÌÒ@@ÌmÛàl¶µCÊÍÅår[GlM[ð 8 GeV ÆµÄ^]ÌM«ðmÛ·éBAW
Fig. 6

Gain curve for a photon energy of 10 keV together with anintensity uctuation. The laser intensity was measured by thedeveloped backscattering­based monitor13). The beamenergy and K­value were set to 7.0 GeV and 1.8, respectively.

[^Ì K l§äÍCMbvÏXÉÎ·étB[htH[hâ³e[uÌ¸xªs\ªÅCÝèðÏX·éxÉO¹²®ðKvÆµÄ«½B±ÌRÍC
â³e[uì¬ÉsÂÈr[O¹ÏÊªèÉÁ¬ísÀè«ÉNö·émCYª¬üµÄ¢é©çÅéB±ÌmCYÌèªÅßm§µ½±ÆÅÀèÈ[U[ðÛÅ«éâ³¸xðB¬·é©Êµª¾çêC[U[^]ÜÅÉÍÀ±z[©ç©RÉ K lðÏXÅ«éVXeð±ü·é\èÅéBã¬ÌÁ¬íÌÀè«ªÝvÚWÉ»óBµÄ¢È¢±ÆàèC·ÔÌ[U[^]ÌÛÉÍ30ªöxÌÁ ¬ íÌ Ä ²® ª Kv ÅéB á ¦Î C © 9  É [U[ðÇDÈóÔÉÝèµ½ÆµÄC»ÌãÌ24ÔÅóµÉ¶½ñÌ²®ðCá¦Î 8 ÔÉs¤Æ¢¤ÌªT^IÈ^]p^[Æ\z³êéB±Ì´öÍ
RF ÌÊª¡GÉhtg·é±ÆÉNöµÄ¨èC»ÝC±ÌbèÎôðißéÆ¤ÉCPvÎôÌ½ßÌ´ö
Fig. 7²¸ð½sµÄÀ{µÄ¢éBSpectrum of 10 keV SASE FEL together with the spontane­
ous radiation of which is magnied by a factor of 1000. Eachdatum shows an average of 10 shots. The beam energy andK­value were set to 7.0 GeV and 1.8, respectively.

[U[É¨¯édqr[Ìd¬s[NÔÍCo`³kðÉæèÙÈéª30`70 fs öxÅéB[U[ÌpXÍCêÊIÉÍ±ÌÉä×Ä·­Cµ©à»ÌÉ½Ì[hª¬ÝµCXpCNãÌ
XyNgð\¬·éBÅås[NoÍÍC±ÌXpCN

94  úËõ March 2012 Vol.25 No.2

Ql¶£
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®«nß½ XFEL {Ý SACLA ¡ r[R~bVjOÉõ¹«\

4)
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6)
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8)
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10)

T. Shintake et al.: Phys. Rev. ST Accel. Beams 12, 070701(2009).
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{ÁWÌÁ¬ín[hEGAÌLQÆD
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11) http://www.apisensor.com/tracker3­usa12) T. Morinaga et al.: ``Alignment of BPM and Q­Mag that uses
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úËõ March 2012 Vol.25 No.2  95 ÒÐî c ÏÆ§s­@l»w¤ d¤úËõÈw¤Z^[ XFEL ¤J­å å·E­mail: tanakaspring8.or.jpêåFÁ¬íÉ¨¯ér[¨mªðn
1982N 3 HÆåwHw¤È»wÂ«HwêUI¹C1982N 4úö®ïÐ´qÍÆ{C1989
N 9 »w¤TCNg¤ºC1999N 5 àc@lPxõÈw¤Z^[Á¬íååÈ¤õC
2005N 4 ¯ååÈ¤õC2006N
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1995Npæ11åwmÛöC¹C
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96  úËõ March 2012 Vol.25 No.2nìaWÆ§s­@l»w¤ d¤úËõÈw¤Z^[ æC¤õE­mail: togawaspring8.or.jpêåFÁ¬íÉ¨¯édqr[¹C
r[¨
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1994N 3 ¼Ã®åwåw@w¤ÈmÛöiOúÛöj¨wêUC¹C
1998N 4 ú{wpU»ïÁÊ¤õC
1998N 9 ¼Ã®åwåw@w¤ÈmÛöiãúÛöj¨wêUC¹C
miwjC2001N 4 æè»w¤
 d¤Bc²Æ§s­@l»w¤ d¤úËõÈw¤Z^[ XFEL ¤J­å
E­mail: ztanakaspring8.or.jpêåFúËõ¹C©Rdq[U[mªðn
1996N 9 såwåw@Hw¤ÈmÛö´qjHwêUC¹C1996N
10  à c @ l  P x õ È w ¤  Z ^[üC1999N 4 »w¤üC2007N 4 ¯êC¤õî´q¼Æ§s­@l»w¤ úËõÈw ¤ Z ^[ XFEL ¤ J­ å
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mªðn
1996Nåwåw@Hwn¤È¨HwêUC2003NmiHwjC1996
Nàc@lPxõÈw¤Z^[C
2007N»w¤ X ü©Rdq[U[væi{ðoÄC2011N 4 æè»EDmiHwjB®«nß½ XFEL {Ý SACLA ¡ r[R~bVjOÉõ¹«\

7. Beam commissioning and achieved laser
performance
Hitoshi TANAKA, Toru HARA, Kazuaki TOGAWA,
Takashi TANAKA, Makina YABASHI
RIKEN Harima Institute, RIKEN SPring­8 Center, XFEL Research and Development Division,
1_1_1, Kouto, Sayo­cho, Sayo­gun, Hyogo 679_5148, Japan

Abstract This article describes the beam commissioning overview of a world's rst compact X­ray Free
Electron Laser named SACLA and the achieved laser performance. Especially, three detailed stories are also
shown on clearing the hurdles to SASE lasing during the beam commissioning.

úËõ March 2012 Vol.25 No.2  97