# ILC LET workshop

chaired by , ,
from to (Europe/Zurich)
at CERN
1211 Geneva Switzerland
 Description This workshop will address the issues of the low emittance transport in the ILC from the damping ring to the interaction point and beyond. A number of issues will be addressed - lattice design, - alignment and tuning studies for all sub-systems, - feedback considerations, - integrated performance simulations, - tolerances and - instrumentation requirements. Conference room: 354-1-001 for all sessions but Friday afternoon In order to register send an email to Muriel Macchi (muriel.macchi@cern.ch) before January 15. The email should give your full name, institute, address and nationality; this is needed to provide the access cards. Please indicate if you want to participate to the banquet and if a cheese fondue would be acceptable for you. This workshop is supported by the EU via ELAN and EUROTeV. Support Email: mailto:muriel.macchi@cern.ch
Go to day
• Wednesday, 8 February 2006
• 09:00 - 10:30 Lattice Design
 Lattices – since we are supposed to be well along in developing these, if not actually finished, this should be a short description of the status and the location of the current lattices.  Goal is to ensure that all simulation jocks have up-to-date lattices and know how to use them and where to get them if updates occur.  As part of this we can discuss the issues related to the curved linac (matching the dispersion into/out of the linac, representing the curvature in the lattice file, etc.)
• 09:00 D. Schulte: Introduction 30'  Material:
• 10:30 - 10:50 coffee break

• 10:50 - 12:30 Main Linac Studies 1
 Main linac tuning techniques – we want independently-prepared versions of our algorithms to give convergent results; we want to understand the limitations of the algorithms as they are (what are the oversimplifications, etc); we want to understand whether these techniques will work on a continually-curved lattice. Goal is to ensure that our tuning techniques actually work (by having independent versions of them which agree) and to define the work that still needs to be done on each of them. To this end we probably need a short presentation from each simulator on what their results are for some given set of inputs (the DFS is already going in this direction), and what their simplifications are, followed by discussion when it turns out they don’t agree. The techniques are BA, DFS, KM.
• 10:50 P. Lebrun: LET studies at Fermilab 30'  Material:
• 11:20 F. Poirier: Dispersion Free Steering for the ILC using Merlin 20'  Material:
• 11:40 A. Latina: Steering the main linac with different bunch compressor settings 20'
• 12:00 J. Smith: Benchmarking of dispersion free steering 20'  Material:
• 12:30 - 13:30 lunch break

• 13:30 - 15:30 Main Linac Studies 2

• 13:30 P. Eliasson: An update on main linac tuning bumps 20'  Material:
• 13:50 D. Schulte: Some Remarks on Disperison Free Steering and Beam Jitter 20'  Material:
• 14:10 K. Kubo: Beam Based Alignment Simulations 10'  Material:
• 14:20 K. Kubo: Curved linac studies update 10'  Material:
• 14:30 D. Schulte: Simulations of a curved tunnel 20'  Material:
• 14:50 R. Jones: Longrange Wakefields and their Effect in the Main Linac 20'
• 15:30 - 15:50 coffee break

• 15:50 - 18:00 Main Linac Studies 3

• Thursday, 9 February 2006
• 09:00 - 10:30 Beam Delivery System Alignment
• 09:00 G. White: Alignment, tuning and feedback in the BDS 20'  Material:
• 09:20 P. Eliasson: Update on beam-beam tuning 20'  Material:
• 10:30 - 10:50 coffee break

• 10:50 - 12:30 Ring to Main Linac Alignment and Tuning

• 10:50 P. Tenenbaum: RTML status and studies 40'  Material:
• 12:30 - 13:30 lunch break

• 13:30 - 15:30 RDR Preparation 1
Preparation for RDR – who is doing what and by when? Presumably this is a long discussion.

• 13:30 Answers to Main Linac Area Systems request for comments 1h30'  Material:
• 15:30 - 15:50 coffee break

• 15:50 - 18:00 RDR Preparation 2

• Friday, 10 February 2006
• 09:00 - 10:30 Polarization Issues
Polarization – what simulations of spin transport have been done so far, and what more needs to be done?
• 09:00 J. Smith: Polarisation studies with BMAD 20'  Material:
• 09:20 I. Bailey: Spin tracking studies by the heLiCal collaboration 20'  Material:
• 09:40 P. Schmid: Spin rotator work 20'  Material:
• 10:30 - 10:50 coffee break

• 10:50 - 12:30 Polarization 2

• 12:30 - 13:30 lunch break

• 13:30 - 15:30 Instrumentation Requirements 1
We need to define the performance requirements of the intrumentation. This requires that we agree on a common model of the intrumentation. An example of typical questions will be the resolution of the BPMs, their long term stability, the linearity, the efrfects of varying beam currents etc.

This session will be a video meeting, which allows other grouos to join. Connection details will be determined soon.
• 13:30 M. Ross: Instrumentation 1h0'  Material:
• 15:30 - 15:50 coffee break

• 15:50 - 18:00 Instrumentationm Requirements 2

• Saturday, 11 February 2006
• 09:00 - 10:30 Summary

• 09:00 P. Tenenbaum: Summary 1h0'  Material:
• 10:30 - 10:50 coffee break

• 10:50 - 12:30 Summary 2