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Review of the recommendations of POSIPOL workshop L. Rinolfi. Wednesday 27 th September 2006. Target. . e +. e + capture and acceleration. Challenges for all schemes. Specific. Common. Target issues Capture systems (Magnets and RF) Remote handling Reliability

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slide1

Review of the recommendations of POSIPOL workshop

L. Rinolfi

Wednesday 27th September 2006

slide2

Target

e+

e+ capture and acceleration

Challenges for all schemes

Specific

Common

Target issues

Capture systems (Magnets and RF)

Remote handling

Reliability

Pre-Damping Ring acceptance

Cost estimate

slide3

Recommendations

Compton

Undulator

  • 1) Publish a design of a Compton ring with chicane
  • Develop reliable power laser and increasing cavity finesse taking account polarization
  • Simulate stacking into DR
  • Experimental demonstration of fast stacking (KEK-ATF or DAFNE).
  • Use CTF3 to test head-on scheme
  • Crab angle crossing scheme
  • Try to relax parameters in the Compton ring increasing the duty cycle
  • Optimization on the energy of Compton photon
  • Experimental optimization of Compton source inside laser cavity at BNL-ATF
  • Comparison of single pass scheme and ring scheme
  • Experimental demonstration using optical cavity and storage ring.
  • Compare CO2, YAG and Fibers
  • Possible use of laser cavity for gamma-gamma collisions
  • Publish results from E-166
  • Evaluate and publish the emittance degradation in the undulator (CLIC emittance constraints, dynamic vacuum issues, wake fileds, ion effects, spurious linac dispersion)
  • Evaluate the coupling of operation
  • Do technical demonstration of undulator (several meters)
  • Finalize the complete layout
  • Do systematic studies of the collimators
  • Describe the transition between the keep-alive source and the Main linac
slide4

Common Recommendations

for Compton and Undulator

  • Analyze systematic errors of polarization measurements
  • Compare yield and polarization for both cases
  • Remote handling in radioactive area
  • Compare heat load dynamics for the 3 schemes
  • Capture and transmission
  • Optimize pre and post selection of e+
  • Evaluate cost estimate
slide5

Progress

Compton

1) Publish a design of a Compton ring with chicane

by E. Bulyak / KIPT- Karhkov

slide6

Progress

Compton

1) Publish a design of a Compton ring with chicane

by E. Bulyak / KIPT- Karhkov

Summary:

" The longitudinal low- insertion seems practical in the linear approximation.

Validation of the idea demands numerical simulations with a real Compton scattering and synchrotron damping. Also the transversal motion should be considered."

slide7

Progress

Compton

12) Compare CO2, YAG and Fibers lasers

A femtosecond laser chain using exclusively Ytterbium done by the end of the year

by Y. Zaouter / CELIA Lab - Amplitude-Systems

High power: a few watts (limited by pump power)

Repetition rate: a few hundred kHz

High energy: a few tens of microJoules per pulse with ultra-short pulses

slide8

Progress

Compton & Undulator

4) Compare heat load dynamics for the 3 schemes

Average heat load in the target

by T. Omori / KEK

ILC target: Ti (Z=22) E (Photons) = 10 MeV

Compton target: W (Z=74) E (Photons) = 30 MeV

ILC target: Average heat load: 11 kW

Compton target: Average heat load: 1.9 kW