September 26, 2005 P.N. Ostroumov
Summary of the required updates for the next iteration #3 of the PD Lattice design
Changes from the previous version of the PD lattice
1. 2. 3. 4. 5. 6. Peak current is 40 mA RFQ output beam energy has been changed to 2.5 MeV Transition energy between the RT and SC structures is ~10 MeV Higher accelerating gradients may be available from multi-spoke cavities All ILC cryostats contain one quadrupole only Development of the alternative option with 1300 MHz elliptical cavities above 110 MeV is required
List of work required for end-to-end BD design&simulations:
1. RT structures: a. Optimize shunt impedance for 4- and 5-gap RT CH structures. Make decision concerning the number of gaps. From BD point of view both options are OK. b. Develop MWS model for 2 CH-cavities to cover energy range from 2.5 MeV to 3 MeV. c. Update 3D field files for all cavities in the energy range 2.5 MeV to 10 MeV. These files are necessary for BD simulations with the TRACK code d. Provide realistic distances between the solenoids and CH resonators taking into account connecting flanges 2. Solenoids: a. Provide 2D (r,z) or 3D (x,y,z) field files within the aperture for the solenoids designed at FNAL. Any format for the data is OK. 3. 325 MHz SC section: a. Fix peak surface fields and Epeak /Eacc for all types of cavities b. Define the length of the cryostats, provide with the realistic location of elements inside the cryostats and inter-cryostat spaces c. Include beam instrumentation specs into the lattice 4. Alternative option with elliptical cavities above ~110 MeV: a. Provide MWS models or 3D fields of 6-cell elliptical cavities for G= 0.5 and G= 0.61 operating at 1300 MHz. (I need to provide with more accurate values for beta geometrical). b. Fix peak surface fields and Epeak /Eacc for all types of SC cavities c. Define the length of the cryostats, provide with the realistic location of elements inside the cryostats and inter-cryostat spaces
5. Lattice design and BD simulations (will be provided by ANL group): a. Update the PD lattice b. Provide end-to-end BD simulations c. Provide high-statistics end-to-end BD simulations with errors d. Develop the lattice and study alternative option with 1300 MHz elliptical cavities starting at 110 MeV
Acronyms
BD – beam dynamics CH - cross-bar H-type MWS – microwave studio PD – proton driver RFQ radio- frequency quadrupole RT – room temperature SC – superconducting