Beam optics in LB and HB section of

Beam optics in LB and HB section of CW section Nikolay Solyak & Arun Saini

Current Layout in LB and HB section (cw_v 6_0 lattice) LB section 5. 1 m 0. 8 m 1. 0 m Cavity NC Doublet Cavity 0. 9 m Cavity SC Doublet HB section 14. 31 m Cavity 0. 8 m

Motivation • Use of only one type of magnet in LB section – Warm magnets • Leads to change in present layout of cryomodule. – Optimization of Numbers of cavities per cryomodule. – Permanent magnets • Strength of quadrupoles are constant. – Also need to reduce number of cavities than present numbers in HB section. • Two layouts are studied. – 4 cavities and 8 cavities per cryomodule in LB and HB section respectively – 3 cavities and 6 cavities per cryomodule in LB and HB section respectively.

Case: 1 Beam optics with 4 LB cavities and 8 HB cavities per cryomodule

Beam envelopes

Phase Advance

Beam emittance

Synchronous phase and Field amplitudes

Case 2: 3 LB cavities and 6 HB cavities per cryomodules

Beam Envelope (4 rms)

Beam RMS Emittance

Phase Advance

Synchronous phase and Field amplitudes

Summary CASE : 1 CASE : 2 Sections Cavity/Mag/Cryomodule Energy LB 4/1*/8 480 Me. V HB 8/1/5 1 Ge. V Final Long. Emitt. Pi. mm. mrad 0. 255 Final Trans. emitt Pi. mm. mrad 0. 208 Sections Cavity/Mag/Cryomodule Energy LB 3/1*/10 471 Me. V HB 6/1*/7 1 Ge. V Final Long. Emitt. Pi. mm. mrad 0. 26 Final Trans. emitt Pi. mm. mrad 0. 21 • 4 LB cavities and 8 HB cavities per cryomodule is possible but • Further studied are need to verify sensitivity against errors. • 3 LB cavities and 6 HB cavities per cryomodule • Short focusing period, good for beam optics. • But Higher number of cryomodules