arXiv subjects

W. Cichalewski

Publications and source records attributed to W. Cichalewski.

4 recordsLinked to original sources

arXiv2026

Results of R&D Programmes and LP&CW EXFEL Cryomodule Tests in the Period from 2005 to 2023

In 2005 and 2006, we began to consider the feasibility of long-pulse (LP) and continuous-wave (CW) operation for the E-XFEL. The operation modes considered were assumed to be complementary to the short-pulse operation (SP), with ~1 ms RF pulses and a 10 Hz repetition rate, which at that time had already been chosen and presented in the TDR [1] of the E-XFEL facility. This operation mode originated from the previously proposed linear collider TESLA project [2]. We initiated several R&D programmes in 2005 and 2006 to enable operation modes with a duty factor significantly higher than that of the short-pulse mode, which is still approximately 1%. In this report, we briefly present the initiated R&D programmes and their results, with particular emphasis on the results of the E- XFEL cryomodule tests, which led to minor modifications of the design and subsequently to the implementation of these cryomodules in large-scale X-ray FEL facilities.

physics.acc-ph↗

arXiv2025

Polish national input to the 2026 update of the European Strategy for Particle Physics

The Polish high energy physics (HEP) community fully recognizes the urgent need to host at CERN a flagship project implementing a broad, long-term, and comprehensive vision of particle physics research and pursuing technological advances. Thus, we give preference and declare willingness to actively engage and participate in every aspect of the FCC project (both FCC-ee and FCC-hh), particularly accelerator development, detector construction, theoretical calculations, and physics analyses. As the e+e- Higgs Factory is the top priority for our field, the proposal to build a linear collider facility at CERN, opening up complementary physics prospects, should be considered as the second option. Polish teams declare strong support and are fully committed to contribute to the full exploitation of all aspects of the physics potential of the LHC and the HL-LHC programmes. To ensure the long-term development of particle physics, we also support the continuation of the high-field magnet research programme, as well as investigating other scenarios including, in particular, linear acceleration techniques and new acceleration technologies such as plasma acceleration, the muon collider and Gamma Factory. In addition, CERN should continue to provide support to fixed-target programmes at SPS as well as other non-collider and non-accelerator experiments at CERN. Participation in major projects conducted in and outside Europe should also be fostered. Education, communication, and outreach of particle physics are of paramount importance for the future of our field. An increased effort coordinated at the European level and resources allocated in all Member States are essential to effectively support future large-scale particle physics projects.

hep-ex↗

arXiv2020

High-Level Software Tools for LLRF System Dedicated to Elliptical Cavities Management of European Spallation Source Facility

The European Spallation Source (ESS) accelerator is composed of superconducting elliptical cavities. When the facility is running, the cavities are fed with electrical field from klystrons. Parameters of this field are monitored and controlled by the Low-Level Radio Frequency (LLRF) system. Its main goal is to keep the amplitude and phase at a given set-point. The LLRF system is also responsible for the reference clock distribution. During machine operation the cavities are periodically experiencing strain caused by the Lorentz force, appearing when the beam is passing through the accelerating structures. Even small changes of the physical dimensions of the cavity cause a shift of its resonance frequency. This phenomenon, called detuning, causes significant power losses. It is actively compensated by the LLRF control system, which can physically tune lengths of the accelerating cavities with stepper motors (slow, coarse grained control) and piezoelements (active compensation during operation state). The paper describes implementation and tests of the software supporting various aspects of the LLRF system and cavities management. The Piezo Driver management and monitoring tool is dedicated for piezo controller device. The LO Distribution application is responsible for configuration of the local oscillator. The Cavity Simulator tool was designed to provide access to properties of the hardware device, emulating behaviour of elliptical cavities. IPMI Manager software was implemented to monitor state of MicroTCA.4 crates, which are major part of the LLRF system architecture. All applications have been created using the Experimental Physics and Industrial Control System (EPICS) framework and built in ESS EPICS Environment (E3).

physics.acc-ph↗

arXiv2018

Simulation of microphonic effects in high $Q_L$ TESLA cavities during CW operations

This document describes a new package to compute high performance simulations of a module of superconducting accelerating cavities from the LLRF controller perspective. The reason to make a dedicated C++/Python package is to simulate all the effects that arise during Continuous Wave (CW) operations at different timescales to speed-up the LLRF controller design. In particular the speed of the sampling rate of the ADCs used in a LLRF control system (some MHz) are $10^4$ - $10^5$ times faster than typical mechanical resonances and microphonics frequencies.

physics.acc-ph↗