Special Projects Group R+D Project Summary
Active Projects
ATF: The special projects group is working with KEK on the ATF damping ring project. The ATF serves as a prototype for the NLC damping rings..
Advanced Collimators: ( Work done in conjunction with the Beam Delivery Group) The goal is to develop a collimator whose surface is continually replaced by a solidifying liquid metal film. This will allow operation at higher electron beam densities than for conventional or consumable collimators.A prototype liquid metal spoiler has been constructed.
Beam Phase Test System: A beam induced field phase measurement system has been tested on the SLC. The performance of this system can be improved, and then it can be extended to provide long term measurements for an entire SLAC linac sector.
Fiber Phase / Timing Transmission system - ( Work done in conjunction with the NLC controls group) The NLC requires phase transmission at the few degrees X-band level over the 30Km length of the accelerator. As a percentage of machine length, this is a factor of 40X improvement over the SLC main drive line. This test is to determine if the required phase stability and phase noise can be met using a fiber optical system.
Final Focus Vibration Stabilization: (Work done in conjunction with the Beam Delivery Group) The final focus magnets require nanometer stabilities. A variety of passive and active systems to stabilize the magnets are being considered.
NLCTA: The Next Linear Collider Test Accelerator is used to test high power X-band RF components, and for general experiments.
Inactive Projects: These projects are still of interest, but are not currently being pursued.
Combined Laser System: (Work done in conjunction with the NLC sources group). The NLC laser wires and the NLC source laser can be constructed using many common parts. Research and development needs to be done to determine the best technologies for each of these systems.
Crab Cavity System - Low Power Test: The NLC requires <0.2° Phase difference jitter between the two crab cavities (assuming X-band). While this is not considered to be particularly difficult, it is critical to the overall layout of the NLC site. This test would be performed at low power, but using components suitable for high power operation. The system would use any available X-band cavity with RF properties similar to the actual crab cavities. The goal is to demonstrate the ability to measure and control the phase jitter at the required level.
Crab Cavity System - High Power Test: This test would use the components from the low power test, with high power RF, and prototype crab cavities.The goal is to demonstrate a full crab cavity system..
Canceled Projects: Projects no longer of interest.
Range Finder: This is a test of a system to optically measure the absolute distance to a target for damping ring circumference control. Note that commercial systems costing approximately $200K are available which meet these requirements. Development effort $45K, 6 Months engineer / physicist. Note: Project not currently recommended.
Page by Josef Frisch frisch@slac.stanford.edu 04/22/2002