Welcome to the RTML content pages!
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.
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.
The RTML lattice files are here. Updated 17 May 2007.
