1. CW Linac Lattice August, 29 N.Solyak, B.Shteynas

2. Previous Baseline lattice 3.8.7.1 Released March 2011 -2.5 MeV; Chopper included; SSR0 (18 cav) not segmented, norm. emit.(x,y,z) = 0.25,0.25, 0275 mm*mrad -Good performances, robust to misalignment and components failure Several recent updates was studied: – Energy starts from 2.1 MeV – New segmentations of SSR0: 3*7 =21 cavities and 2*9=18 cavities, – Re-optimization of SSR2 section with beta=0.47 spoke cavity New lattice (3.9) includes all recently proposed changes (2.1 MeV): – SSR0 segmentation with missing solenoid: 2x9 cavities – Shorter SSR1 cryomodule (8 vs. 10 cavities) – Shorter SSR2 cryomodule (9 vs. 11 cavities) – Matched for lower emittances from Staples RFQ: 0.14,0.14, 0.217 mm*mrad

3. New design: RFQ-MEBT-SSR0: 10 MeV acceleration 1σ envelopes Match from RFQ to chopper SSR0 (2x9cav) MEBT Chopper SRR0 Match to SRR0 Triplet focusing in Chopper and matching sections (+1 SC solenoid) Six RT 325 MHz bunching cavities in MEBT SSR0 is splitted in two ~5.1 m cryomodules with 9 cavities a 8 solenoids inside

4. ɛ n x,y,z = 0.139, 0.14, 0.217 mm∙mmrad; Energy: 2.1 _> 178.7 MeV; Current: 5mA@162.5MHz Envelope X&Y (mm)- Z(mm) (chopper-front end) MEBT, Chopper SSR0 (2x9cav) SSR1(2x8cav) SSR2 (4x9cav) Missing solenoid Spoke cavity part of the Linac (up-to ~180 MeV) 2 shorter SSR1 CMs with 8 cavities/8solenois (vs. 10 in previous version) 4 shorter SSR2 CMs with 9 cav /5 solenoids (vs. 11cav/6 solenoids). beta=0.47 All spacing between CMs kept the same

5. Comparison of current design and version 3.8.7.1 Section Freq, MHz Energy, MeVLength m Cav/mag/CM Period m CM Length* Type SSR03252.1 – 9.610.9818 / 16 / 2 0.61 5.08SSR, solenoid SSR13259.6 – 35.113.216 / 16 / 2 0.8 6.4SSR, solenoid SSR2 (β=0.47)32535.1 – 165.435.436 / 20 / 4 1.6 7.8SSR, solenoid LB 650650165.4 – 556.269.342 / 14 / 77.15-cell, doublet HB 650650556.2 – 3064.5296.6152 / 19 / 1911.2 5-cell, doublet Section Freq, MHz Energy, MeV Length, m Cav/mag/CMType SSR03252.5 – 11.410.9818/18/1SSR, solenoid10.98 SSR132511.4 – 42.916.420/20/2SSR, solenoid8 SSR2 (β=0.42)32542.9 – 178.739.4444/24/4SSR, solenoid8.84 LB 650650178.7 – 558.769.342/14/75-cell, doublet7.1 HB 650650558.7 – 3060.5292.6152/19/195-cell, doublet11.2 Current variant (total length = 437 m, incl. 14.8 m MEBT) Lattice 3.8.7.1 (total length = 444 m, incl. 14.8 m MEBT) Savings in cavities (current vs. 3.8.7.1): ΔSSR1 = 4; ΔSSR2= 8; Total savings: 12 cavities / 10 solenoids / 7 m of tunnel

6. Emittance: 0.139, 0.14, 0.217 Energy: 2.1 MeV– 3064 MeV; Current: 5 mA@162.5MHz Full lattice for 3 GeV Linac SSR0 SSR1 SSR2 LE650 (7CMs /6 cav) HE650, beta 0.9 (19 CMs with 8 cav)

7. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Phase advance Note: In chopper section used cavity period, not magnet

8. Emittance: 0.139, 0.14, 0.217 0.217mm*mrad, Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Phase advance per meter

9. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Synchronous phase

10. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Emittances: Longitudinal (green), Transv. (pink)

11. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Envelope of 99% of long. emittance

12. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Sync. Phases vs. longitudinal beam size

13. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Surface magnetic field

14. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Cryogenic Losses

15. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Surface electric field

16. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Energy gain

17. Emittance: 0.139, 0.14, 0.217mm*mrad Energy: 2.1 MeV – 3064 MeV; Current: 5 mA@162.5MHz Gradient

18. Back-up slides