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SCUs for the LCLS-II HXR FEL P. Emma July 8, 2014
Pe 120 kW SXU 0.93 m LTUS LH BC1 BC2 LCLS-I Linac 0.65 m L1 D2 L2-Linac L3-Linac Sec 2.50 m BC3 D10 Lu 145 m Pe 250 kW LTUH “kicker” m-wall HXU Pe 120 kW Soft X-Ray (SXR) FEL for LCLS-II must cover keV (4-GeV) Hard X-Ray (HXR) FEL for LCLS-II must cover 1-5 keV (4-GeV) SASE to 5 keV is just possible (with no margin) Self-seeding with PMU not possible beyond 4 keV Radiation dose at 1 MHz threatens PMU fields (DK/K ~ 0.01%) SCU can extend photon range toward 8 keV, and beyond, with much less sensitivity to radiation dose
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E = 4.0 GeV (nominal) PMU g = 5 mm NbTi Nb3Sn g = 4 mm g = 4 mm 145 m
magnetic gap is 2.3 mm larger than vac. gap, g PMU g = 5 mm NbTi Nb3Sn g = 4 mm g = 4 mm ~5 keV SASE 7.6 keV SASE 145 m 6.8 keV SASE gex,y = 0.40 mm Ipk = 1 kA sE = 500 keV b = 16 m 20% Lu margin 3.4-m seg’s 1.0-m breaks 1 und. missing 1.5 keV low-lim. lu = 25.6 mm, 18.4 mm, 16.8 mm K = , , B = T, T, T
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E = 4.2 GeV (stretch) PMU NbTi g = 5 mm Nb3Sn g = 4 mm g = 4 mm 145 m
magnetic gap is 2.3 mm larger than vac. gap, g PMU NbTi g = 5 mm Nb3Sn g = 4 mm g = 4 mm 145 m 8.2 keV SASE gex,y = 0.40 mm Ipk = 1 kA sE = 500 keV b = 16 m 20% Lu margin 3.4-m seg’s 1.0-m breaks 1 und. missing 1.65 keV low ~7 keV HXRSS limit
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E = 4.8 GeV (20% upgrade) PMU g = 5 mm NbTi g = 4 mm 145 m Nb3Sn
magnetic gap is 2.3 mm larger than vac. gap, g PMU g = 5 mm NbTi g = 4 mm 10 keV SASE 145 m Nb3Sn g = 4 mm 8.3 keV HXRSS limit
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E = 4.0 GeV (nominal) – all 5-mm vac. gaps
PMU g = 5 mm NbTi Nb3Sn g = 5 mm g = 5 mm 145 m lu = 25.6 mm, 19.2 mm, 17.6 mm
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E = 4.2 GeV - all 5-mm vac. gaps PMU NbTi Nb3Sn g = 5 mm g = 5 mm
lu = 25.6 mm, 19.2 mm, 17.6 mm
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E = 4.8 GeV - all 5-mm vac. gaps PMU NbTi g = 5 mm g = 5 mm 145 m
Nb3Sn g = 5 mm 7.9 keV HXRSS limit lu = 25.6 mm, 19.2 mm, 17.6 mm
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E = 3.4 GeV (drop 5 Cryo-Modules)
NbTi g = 4 mm 145 m Nb3Sn g = 4 mm lu = 25.6 mm, 18.4 mm, 16.8 mm
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