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Title: The LCLS-II LLRF System

The SLAC National Accelerator Laboratory is planning an upgrade (LCLS-II) to the Linear Coherent Light Source with a 4 GeV CW superconducting (SCRF) linac. The SCRF linac consists of 35 ILC style cryomodules (eight cavities each) for a total of 280 cavities. Expected cavity gradients are 16 MV/m with a loaded QL of ~ 4x107. The RF system will have 3.8 kW solid state amplifiers driving single cavities. To ensure optimum field stability a single-source single-cavity control system has been chosen. It consists of a precision four-channel cavity receiver and RF stations (Forward, Reflected and Drive signals). In order to regulate the resonant frequency variations of the cavities due to He pressure, the tuning of each cavity is controlled by a Piezo actuator and a slow stepper motor. In addition the system (LLRF-amplifier-cavity) is being modeled and cavity microphonic testing has started. This paper describes the LLRF system under consideration, including recent modeling and cavity tests.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [5] ;  [5]
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  5. FNAL, Batavia, IL
Publication Date:
OSTI Identifier:
1223483
Report Number(s):
JLAB-ACE--15-2107; DOE/OR/23177--3550;
TRN: US1601449
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; SUPERCONDUCTING CAVITY RESONATORS; STANFORD LINEAR ACCELERATOR CENTER; AMPLIFIERS; ELECTRIC MOTORS; LINEAR ACCELERATORS; GEV RANGE 01-10; LIGHT SOURCES; CONTROL SYSTEMS; RF SYSTEMS; ACTUATORS; PLANNING; SIMULATION; TESTING; TUNING; FREQUENCY CONTROL