The injector of the European XFEL will use a third harmonic RF system at 3.9 GHz to flatten the RF curvature after the first accelerating module before the first bunch compression stage. This paper presents qualification tests of the prototype cavities and the status of the activities for the realization of the third harmonic section of the European XFEL towards its commissioning due in 2014.

Realization (probability)

Harmonic

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Towards a Muon Collider

arXiv (Cornell University) (2023)

C. Accettura Dean Adams Rohit Agarwal C. Ahdida C. Aimè

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work.

Muon collider

10.48550/arxiv.2303.08533

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ILC COAXIAL BLADE TUNER

C. Pagani A. Bosotti P. Michelato N. Panzeri Rocco Paparella

A coaxial (blade) tuner solution has been developed for the compensation of the Lorentz force detuning of the superconducting cavities under the high gradient pulsed operation foreseen for ILC operation. The device is based on prototypes successfully tested at DESY in 2002 both on CHECHIA and on the superstructures inserted in the TTF string. During both tests the blade tuner performed as expected in terms of stiffness, frequency sensitivity and tuning capabilities. An improvement of the tuner characteristics has been designed by the integration of fast tuning capabilities by means of piezo-ceramic elements. Two prototypes of the new INFN coaxial piezo blade tuner have been manufactured and will be tested in the near future at DESY and BESSY after integration with the cavities. In this paper the blade tuner design and its main characteristics are presented, together with the perspectives of a sensible cost reduction from the prototypes, in view of the large scale production foreseen for the ILC.

Tuner

Coaxial

DESY

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INFN-LASA Cavity Design for PIP-II LB650 Cavity

18th Int. Conf. on RF Superconductivity (SRF'17), Lanzhou, China, July 17-21, 2017 (2018)

C. Pagani Michele Bertucci Andrea Bignami A. Bosotti Jinfang Chen

10.18429/jacow-srf2017-tupb070

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INFN-LASA for the PIP-II LB650 Linac

12th International Particle Accelerator Conference (IPAC'21), Campinas, SP, Brazil, 24-28 May 2021 (2021)

Rocco Paparella Michele Bertucci M. Bonezzi A. Bosotti Alessio D'Ambros

10.18429/jacow-ipac2021-thpab348

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Development of an Acceptance Test Procedure for the XFEL SC Cavity Tuners

A. Bosotti Rocco Paparella L. Lilje Clemens Albrecht

Cavity tuners are needed to precisely tune the resonant frequency of TESLA SC cavities for European XFEL linac. Although several units of the currently used device, originally designed at Saclay for TTF and then developed at DESY, have been manufactured and tested so far, a permanent installation like the XFEL poses higher requirements in terms of reliability and reproducibility. XFEL indeed requires about 1000 tuners to be produced in a relatively short time and then to simultaneously work in cryogenic environment, each of them being equipped with a stepper motor driving unit and two piezoelectric actuators. In this frame, an acceptance test procedure, here presented, has been studied, its main goal being the cross-check of issues affecting reliability: installation, mechanical coupling of active elements to cavity, motor and fast actuators functionality. An electronic equipment has been developed for driving signals, sensors and data management, specifically aiming toward an automatic and user-friendly routine in view of a large scale application. The procedure has been then applied for calibration purposes of a sample cavity assembly, the experimental results are also presented.

DESY

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A Novel Approach for Hardware Implementation of a Detuning Compensation Control System for SC Cavities

Konrad Przygoda Rocco Paparella

Superconducting (SC) resonant cavities seems to be an attractive option for various linear accelerators under construction. The nine-cell 1.3 GHz cavities have demonstrated gradients up to 38 MV/m. They are susceptible to small changes of dimension caused by mechanical vibrations, cooling systems, human activity (microphonics) and high gradients of RF field (Lorentz forces) as well. FPGA-based control system for cavity detuning compensation is presented.

Microphonics

Lorentz force

10.1109/mixdes.2007.4286129

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Citations (7)