Low Level RF Workshop 2022

Session

Superconducting RF

8

13 Oct 2022, 08:20

Buildings 1 and 3 (FHNW Campus Brugg-Windisch)

Conveners

Superconducting RF: Superconducting RF 1/2

• Curt Hovater (Jefferson Lab)

Superconducting RF: Superconducting RF 2/2

• Curt Hovater (Jefferson Lab)

52. Status of the LCLS-II SRF Systems and LLRF Commissioning

Andy Benwell (SLAC)

13/10/2022, 08:20

Low Level RF Workshop 2022

Oral

The SLAC National Accelerator Laboratory has completed the installation and checkout of RF systems for the SRF based accelerator 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 injector is imminent...

98. ESS LLRF status and activities

Mr Anders Svensson (European Spallation Source (ESS))

13/10/2022, 08:50

Low Level RF Workshop 2022

Oral

The commissioning of the ESS linac is ongoing and the five first normal conductive (NC) cavities have recently been operated with beam. An overview of the LLRF systems in use, first commissioning results with initial beam, and experiences are presented. The initial Piezo compensation tests obtained at the Medium Beta cavity test stand is also presented.

31. Fermilab PIP-II Injector Test - LLRF System Design and Performance

P. Varghese (Fermi National Accelerator Laboratory(FNAL))

13/10/2022, 09:10

Low Level RF Workshop 2022

Oral

PIP-II IT is a test facility for the PIP-II project where the injector, warm front-end and the first two superconducting cryomodules were tested. The warm front-end consists of an Ion source, an RFQ and three buncher cavities. The superconducting cryomodules consist of an 8-cavity half-wave-resonator(HWR) cryomodule operating at 162.5 MHz followed by an 8-cavity single-spoke resonator(SSR1)...

59. Testing of a modified Active disturbance Rejection Control (ADRC) algorithm for microphonics rejection in Superconductive Radio Frequency (SRF) cavities

Ander Elejaga Estiballes (UPV/EHU)

13/10/2022, 09:30

Low Level RF Workshop 2022

Oral

SRF cavities are characterized by low energy loses derived from their extremely high intrinsic quality factor. In accelerators geared towards new applications such as new light source linacs, such cavities are operated with extremely high loaded quality factor due to the negligible beam loading involved. In those particular cases, the bandwidth of RF systems is very narrow, so they become much...

75. Operational Experience of the SELAP Algorithm for LLRF Control System at JLAB

Ramakrishna Bachimanchi (Jefferson Lab)

13/10/2022, 10:20

Low Level RF Workshop 2022

Oral

The JLAB LLRF 3.0 system has been developed and is replacing the 30-year-old LLRF systems in the CEBAF accelerator. The LLRF system builds upon 25 years of design and operational RF control experience (digital and analog), and our recent collaboration in the design of the LCLS-II LLRF system. The new system also incorporates a cavity control algorithm using a fully functional phase and...

86. Mitigating instabilities in SRF resonance control loops

Larry Doolittle (LBNL)

13/10/2022, 10:40

Low Level RF Workshop 2022

Oral

LLRF systems usually include a resonance control loop, in which an actuator adjusts the frequency of the cavity's electrical resonance. Electrical measurement of the cavity detune frequency and a control algorithm complete the feedback loop. In SRF cavities with a piezoelectric actuator, this loop is responsible for compensating cavity Lorentz forces and drifts in helium pressure (in some...