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Side Coupled Linac Design at CERN M. Pasini, Abingdon September 28 th , 2005

Side Coupled Linac Design at CERN M. Pasini, Abingdon September 28 th , 2005. CONTENTS:. SCL structure Beam Parameters SCL Layout RF studies Frequency error study Conclusions. SCL Principles. Why SCL?.

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Side Coupled Linac Design at CERN M. Pasini, Abingdon September 28 th , 2005

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  1. Side Coupled Linac Design at CERNM. Pasini, Abingdon September 28th, 2005 1

  2. CONTENTS: • SCL structure • Beam Parameters • SCL Layout • RF studies • Frequency error study • Conclusions 2

  3. SCL Principles 3

  4. Why SCL? • Above 90 MeV the effective Shunt Impedance of the SCL is bigger then the one of the CCDTL. • Compared to on-axis coupled structure (OCS) and/or annular-ring-coupled structure (ACS) the SCL offers a good mode separation in the coupling cell and simple and well established tuning procedure. • SCL cells can be easily machined on a lathe (using a circular frame) with tolerance within 0.05 mm in the nose cone region. • Alternative production technologies like Electrical Discharge Machining (EDM) (investigated by INFN-Naples) might reduce production costs. 4

  5. ZT2 Curve CCDTL DTL tank2 SCL DTL tank3 DTL tank1 5

  6. Beam Parameters 6

  7. SCL Layout design program 7

  8. SCL Layout design program 8

  9. SCL Layout 9

  10. RF Studies with MWS Coupling and Shunt impedance study as a function of the intersection length Geometric shapes of the coupling slot and hence coupling factors are well defined because each slot is re-machined 10

  11. PSPICE Simulation ±50 kHz error only on the accelerating cells ±50 kHz error on the accelerating and coupling cells For a complete module of 5 tanks we expect a maximum error of ± 0.9% for the field level 11

  12. 704 MHz Klystrons Contacts with 2 manufacturers : Thales – 4 MW single beam klystron Toshiba – 5 MW multiple beam klystron • Max pulse length = 2ms • Rep rate = 50 Hz • RF duty factor = 10 % 12

  13. Summary / Conclusions • A layout of the SCL section is completed. • The new Excel tool allows to design SCL with a variety of free parameters. • Coupling coefficients of 3% guarantees low field error (with 50 kHz tuning accuracy) with minimum reduction in Q-value. • Design for 2 klystrons meeting our specs are existing. 13

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