Speaker
Description
The Phase Reference Line (PRL) for LCLS-II-HE is an extension of the PRL used for LCLS-II. The system provides a reference signal of 1300 MHz, a 185.7 MHz reference signal for the timing system, and a 1320 MHz LO for the LLRF system. The 1300 MHz signal is sent along a rigid coaxial cable down in the linac tunnel for minimal changes in length due to thermal expansion and contraction. To cancel out the effect of thermal drift on the phase of the signal, phase averaging is used. For the HE installation, the rigid coaxial line in the linac tunnel will be extended from sector 7 to sector 10. In the klystron gallery, the 185.7 MHz timing reference signal and the 1320 MHz LO signal will be extended down to sector 10 and distributed to the LLRF racks. There is also consideration for moving the MO from sector 2 to the Injector CID for increased beam stability or moving the MO to sector 10 and replacing the RF over fiber system with a coaxial line to the experiment hall for increased stability on that end.
This poster will discuss the overall system design, the performance, the extension of the system for the HE installation and the potential changes made to the existing system.
| Abstract Category | Timing and Synchronization |
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