ILC - International Linear Collider

Ring to Main Linac (RTML) Content Pages

Welcome to the RTML content pages!


The RTML area systems leaders are Eun-San Kim and Peter (PT) Tenenbaum. They are happy to hear from you!

Upcoming Changes in RTML Design

The RTML Area Systems team will shortly be making a significant set of changes to the design described here and on the technical / global systems below. Some of these changes are directed at reducing the cost of the system, while others are in support of the central DR proposal (these changes will raise the cost of the RTML but lower the total cost of the ILC). In preparation for the Valencia GDE meeting, we have put together a new wiki page summarizing the changes to each technical and global system.

Brief Description

The RTML starts just downstream of the damping ring extraction system: the agreed-upon “handover” point is downstream of a quadrupole doublet that follows the bend which closes the dispersion. The RTML continues until the upstream face of the first main linac cryomodule (nominally at 15 GeV). The RTML includes the following subsystems, in order of S position:

  • A bending system which follows the geometry of the LTR beamline (the RTML and LTR share a tunnel at this location) which brings the beam perpendicular to the damping ring straights, and therefore parallel to the linacs
  • A decoupling system with 4 orthonormal skew quads
  • An emittance measurement station with 4 laser wire scanners
  • A betatron collimation system which eliminates transverse beam halo: collimation is 2 phases x 2 planes x 1 iteration
  • A pulsed extraction system which can absorb the full 220 kW beam power; this system permits the injectors to run at full power while keeping the beam out of the linac tunnel for access segmentation
  • A long system to take the beam from the DR location at the center of the site to the BC location at the far end of the site; this system has a long FODO lattice and also an “escalator” vertical dogleg which brings the beam from the DR elevation to the ML elevation
  • A turnaround reverses the beam direction of travel, and also permits a trajectory feed-forward to be included
  • A spin rotator which allows the polarization vector to be oriented to any direction desired by the experimenters
  • A second decoupler with 4 orthonormal skew quads
  • A second 4 wire emittance measurement station which includes the steering dipoles for trajectory feedforward correction.
  • A first stage bunch compressor which compresses the RMS bunch length to about 1 mm, and includes a pulsed extraction system so that the beam need not be sent on to the next system during tuneup of the bunch compressor
  • A second stage bunch compressor which compresses the RMS bunch length to 200 to 300 um
  • A third 4-wire emittance measurement station and pulsed extraction system.

Lattice Files

The RTML lattice files are here. Updated 17 May 2007.

Technical Systems Information

Vacuum systems – updated 2007 April 19
Magnet systems – updated 2007 April 17
Cryomodules and Cavities – updated 2007 April 04
RF power – updated 2007 March 15
Instrumentation – updated 2006 June 06
Accelerator Physics – updated 2006 June 08
Collimators and Dumps – updated 2007 April 04

Global Systems

Commissioning, Operations, Reliability
Control System – updated 2006 june 14
Cryogenics – updated 2006 May 31
CF&S – updated 2006 May 24

Design and Cost Board Information, Reviews, Etc.

Useful Links

rdr/rdr_as/rtml_home.txt · Last modified: 2007/05/17 13:06 by rdr
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