LCLS Conceptual Design Report - Stanford Synchrotron Radiation ...

L C L S C O N C E P T U A L D E S I G N R E P O R T
Figure 11.3 Integration of the EPICS subsystems into the SLC control system
Control of the hardware and acquisition of data from the sensors and diagnostics
instrumentation will be done by refurbished existing CAMAC and/or new VME-based
systems. The workstations will be linked to a new CAMAC or VME Crate Controller
module. The workstations will also be linked to the SLAC network via Ethernet. This link
will allow communications with the SLC computer and with other control consoles.
The LCLS is a demanding accelerator system to tune and run. It will require extensive
use of feedback systems. Most of these feedbacks will be similar to existing systems at SLAC
and others will require new algorithms and software. The controls hardware will be designed
with these feedbacks in mind.
11.2 Injector Controls
The LCLS injector provides a 150 MeV electron beam that is injected into the existing
SLAC linac at the beginning of sector 21. The injector is a new device housed in the off-axis
injector enclosure near sector 20. Its main components are an RF gun and associated laser, a
short accelerator (L0) and a beam transport line (DL1). The laser for the RF Gun is similar to
the system currently used for the polarized electron gun on the linac. Similar controls will be
required for the LCLS laser. A table of the control points for the injector is included in
appendix B.
11.3 Accelerator Controls
The main components of the LCLS accelerator are three pieces of existing linac (L1, L2
and L3) and a reconfigured beam transport line (DL2) in the Undulator Hall. The LCLS
requires new systems for manipulating and transporting the required electron beam. These
consist of two new bunch compressors (BC1 and BC2), two transverse S-band RF cavities, an
11-4 ♦ C O N T R O L S