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Title: Status of the LCLS-II Accelerating Cavity Production

Abstract

Cavity serial production for the LCLS-II 4 GeV CM SRF linac has started. A quantity of 266 accelerating cavities has been ordered from two industrial vendors. Jefferson Laboratory leads the cavity procurement activities for the project and has successfully transferred the Nitrogen-Doping process to the industrial partners in the initial phase, which is now being applied for the production cavities. We report on the results from vendor qualification and the status of the cavity production for LCLS-II.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1375763
Report Number(s):
JLAB-ACC-17-2463; DOE/OR/23177-4134
DOE Contract Number:
AC05-06OR23177; AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2017, Copenhagen, Denmark, May 14-19, 2017
Country of Publication:
United States
Language:
English

Citation Formats

Daly, Ed, Marhauser, Frank, Fitzpatrick, Jarrod A., Palczewski, Ari D., Preble, Joe, Wilson, Katherine M., Grimm, C. J., Burrill, Andrew B., and Gonnella, Daniel. Status of the LCLS-II Accelerating Cavity Production. United States: N. p., 2017. Web. doi:10.18429/JACoW-IPAC2017-MOPVA131.
Daly, Ed, Marhauser, Frank, Fitzpatrick, Jarrod A., Palczewski, Ari D., Preble, Joe, Wilson, Katherine M., Grimm, C. J., Burrill, Andrew B., & Gonnella, Daniel. Status of the LCLS-II Accelerating Cavity Production. United States. doi:10.18429/JACoW-IPAC2017-MOPVA131.
Daly, Ed, Marhauser, Frank, Fitzpatrick, Jarrod A., Palczewski, Ari D., Preble, Joe, Wilson, Katherine M., Grimm, C. J., Burrill, Andrew B., and Gonnella, Daniel. Mon . "Status of the LCLS-II Accelerating Cavity Production". United States. doi:10.18429/JACoW-IPAC2017-MOPVA131. https://www.osti.gov/servlets/purl/1375763.
@article{osti_1375763,
title = {Status of the LCLS-II Accelerating Cavity Production},
author = {Daly, Ed and Marhauser, Frank and Fitzpatrick, Jarrod A. and Palczewski, Ari D. and Preble, Joe and Wilson, Katherine M. and Grimm, C. J. and Burrill, Andrew B. and Gonnella, Daniel},
abstractNote = {Cavity serial production for the LCLS-II 4 GeV CM SRF linac has started. A quantity of 266 accelerating cavities has been ordered from two industrial vendors. Jefferson Laboratory leads the cavity procurement activities for the project and has successfully transferred the Nitrogen-Doping process to the industrial partners in the initial phase, which is now being applied for the production cavities. We report on the results from vendor qualification and the status of the cavity production for LCLS-II.},
doi = {10.18429/JACoW-IPAC2017-MOPVA131},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}

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  • Third harmonic system was originally developed by Fermilab for FLASH facility at DESY and then was adopted and modified by INFN for the XFEL project [1-3]. In contrast to XFEL project, all cryomodules in LCLS-II project will operate in CW regime with higher RF average power for 1.3 GHz and 3.9 GHz cavities and couplers. Design of the cavity and fundamental power coupler has been modified to satisfy LCLS-II requirements. In this paper we discuss the results of COMSOL thermal and mechanical analysis of the 3.9 GHz coupler and cavity to verify proposed modifica-tion of the design. For the dressedmore » cavity we present simulations of Lorentz force detuning, helium pressure sensitivity df/dP and major mechanical resonances.« less
  • Development and production of Linac Coherent Light Source II (LCLS-II) is underway. The central part of LCLS-II is a continuous wave superconducting RF (CW SCRF) electron linac. The 3.9 GHz third harmonic cavity similar to the XFEL design will be used in LCLS-II for linearizing the longitudinal beam profile*. The initial design of the 3.9 GHz cavity developed for XFEL project has a large, 40 mm, beam pipe aperture for better higher-order mode (HOM) damping. It is resulted in dipole HOMs with frequencies nearby the operating mode, which causes difficulties with HOM coupler notch filter tuning. The CW linac operationmore » requires an extra caution in the design of the HOM coupler in order to prevent its possible overheating. In this paper we present the modified 3.9 GHz cavity End Group for meeting the LCLS-II requirements« less
  • An Accelerated Life Test (ALT) of the Phytron stepper motor used in the LCLS-II cavity tuner has been conducted at JLab. Since the motor will reside inside the cryomodule, any failure would lead to a very costly and arduous repair. As such, the motor was tested for the equivalent of 30 lifetimes before being approved for use in the production cryomodules. The 9-cell LCLS-II cavity is simulated by disc springs with an equivalent spring constant. Plots of the motor position vs. tuner position ' measured via an installed linear variable differential transformer (LVDT) ' are used to measure motor motion.more » The titanium spindle was inspected for loss of lubrication. The motor passed the ALT, and is set to be installed in the LCLS-II cryomodules.« less
  • An overview of the design status of each RF amplifier system is presented and potential opportunities for industry involvement are identified. Specifically, brief descriptions of the LINAC, LEB, MEB, HEB, and Collider RF Amplifier systems are presented, as well as the LEB and MEB cavities. Status in the LINAC ranges from an RFQ Amplifier being operational at the SSC to procurement of subsystems still pending. The LEB prototype system is in tests at SSC, and the MEB prototype system is has begun, and desip of the MEB RF system will begin in 1994.