Mitigation of Emittance Dilution Due to Transverse Mode Coupling in the L-Band Linacs of the ILC
The main L-band linacs of the ILC accelerate 2820 bunches from a center of mass of 10 GeV to 500 GeV (and in the proposed later upgrade, to 1 TeV). The emittance of the vertical plane is approximately 400 times less than that of the horizontal plane. Provided the vertical and horizontal mode dipole frequencies are degenerate then the motion in each plane is not coupled. However, in reality the frequency degeneracy is split and the eigenmodes are shifted due to inevitable manufacturing errors introduced in fabricating 20,000 cavities. This gives rise to a transverse coupling in the horizontal-vertical motion and can readily lead to a dilution in the emittance in the vertical plane. We investigate means to ameliorate this effect dilution by splitting the horizontal-vertical tune of the lattice.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 902486
- Report Number(s):
- SLAC-PUB-12469; TRN: US0702848
- Resource Relation:
- Conference: Prepared for European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006
- Country of Publication:
- United States
- Language:
- English
Similar Records
Emittance Dilution due to Many-Band Long-range Dipole Wakefields in the International Linear Collider Main Linacs
Exact cancellation of emittance growth due to coupled transverse dynamics in solenoids and rf couplers