LLRF 2023

Session

System and operation

Oct 23, 2023, 1:45 PM

Lahan Select Gyeongju, South Korea

25. LLRF System for the Fermilab PIP-II Superconducting LINAC

Dr Philip Varghese (Fermilab)

10/23/23, 1:45 PM

System and operation

Oral

PIP-II is an 800 MEV superconducting linac scheduled to start the installation and commissioning phase in 2025. The LLRF system design is in the final design review phase this year and will enter the production phase next year. The PIP-II project is an international collaboration with various partner labs contributing subsystems. The LLRF system design for the PIP-II Linac is presented and...

21. Design and operation of the new digital LLRF system for CAFe SC linac

Zheng Gao (Institute of Modern Physics)

10/23/23, 2:15 PM

System and operation

Oral or Poster

The superconducting radio frequency(SRF) linac of Chinese ADS front-end demo(CAFe) facility was built by Institute of Modern Physics(IMP) to demonstrate the feasibility of a 10-mA high power continuous-wave proton beam for the CiADS project. In order to achieve the strict requirements of the facility, which require extremely low beam loss levels for 10 mA high intensity beam, the phase and...

51. Present Status of J-PARC Linac LLRF System

Kenta Futatsukawa (High Energy Accelerator Research Organization (KEK))

10/23/23, 2:35 PM

System and operation

Oral

In the low-level radio-frequency (LLRF) control system J-PARC Linac, the digital feedback and feedforward (DFB and DFF) system plays an important role in stabilizing the output beam momentum by achieving a high-precision cavity electric field. The twenty-four 324 MHz DFB and DFF systems were upgraded to a new system using a MTCA board in 2020-2021. The increased degrees of freedom in the...

56. The HL-LHC LLRF project

Gregoire Hagmann (CERN)

10/23/23, 2:55 PM

System and operation

Oral or Poster

In the framework of the High Luminosity LHC project (HL-LHC), crab cavities (CC) will be installed on both sides of the LHC interaction point (IP) 1 (ATLAS experiment) and point 5 (CMS experiment) to restore an effective head-on collision and minimize the geometric luminosity loss which arises from the crossing angle. Two crab cavities will be installed on each side of the IPs for each beam...

92. Status of the LCLS-II SRF Accelerator

Andy Benwell (SLAC)

10/23/23, 3:15 PM

System and operation

Oral or Poster

The SLAC National Accelerator Laboratory has completed the installation and checkout of a RSF linac for the LCLS-II, an ultra-bright Free Electron Laser. The LCLS-II is composed of 296 SRF cavities plus 2 NC cavities, each with its own LLRF control system and dedicated RF amplifier. At the time of this abstract submission, beam transport through the soft X-Ray undulators is imminent and...

47. Drift Observations and Mitigation in LCLS-II RF

Shreeharshini Dharanesh Murthy (Lawrence Berkeley National Laboratory)

10/23/23, 4:05 PM

System and operation

Oral or Poster

The LCLS-II RF system physically spans ~700m and has strict requirements -- on the order of 20 fs -- on the phase stability of the accelerating RF fields in its SRF linac.
While each LLRF rack is crudely temperature-stabilized, the weather inside the service building as a whole is usually compared to a tin shack in the California sun. A phase-averaging reference line is the primary system...

86. LCLS-II-HE LLRF

Mr JING CHEN (SLAC National Accelerator Laboratory)

10/23/23, 4:25 PM

System and operation

Oral or Poster

Abstract

The LCLS-II-HE project is a high energy upgrade of the existing LCLS-II superconducting LINAC at SLAC which will increase its baseline energy from 4 GeV to 8 GeV. A new LINAC section L4 will be added with 23 new high gradient cryomodules, 184 SRF cavities, tested to a mean gradient of 22 MV. The LLRF system to control the new cavities will be comprised of 46 HE LLRF rack...

94. Flat gateware architecture for low level RF control

Gang Huang

10/23/23, 4:45 PM

System and operation

Oral or Poster

FPGA gateware is the core component for the accelerator low level control system. A flatten architecture is introduced in this paper to improve the system modularity and so improve the code maintainability. This code architecture utilizes the new capability introduced in the system verilog, such as interface and alias to realize the design goal. A series of python and tcl scripts are developed...

121. Implementation of flat-top output pulse of RF pulse compressor for SXFEL

System and operation

Poster

The adaptive control-based low-level radio frequency (LLRF) algorithm was developed for the two-bunch operation of the Shanghai Soft-X-ray Free Electron Laser Facility (SXFEL), needing to generate flat-top radio frequency (RF) power pulses at the output of an RF pulse compressor. The adaptive algorithm optimized for the compressor system can achieve a better convergence rate and domain. The...