Enrico Cenni

Université Paris-Saclay

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Kensei Umemori

High Energy Accelerator Research Organization

M. Sawamura

National Institutes for Quantum and Radiological Science and Technology

Hiroshi Sakai

Hiroshima University

Guillaume Devanz

CEA Paris-Saclay

Kenji Shinoe

High Energy Accelerator Research Organization

T. Furuya

High Energy Accelerator Research Organization

Luc Maurice

Institut de Recherche sur les Lois Fondamentales de l'Univers

Kazuhiro Enami

High Energy Accelerator Research Organization

Olivier Piquet

CEA Paris-Saclay

Patrick Sahuquet

CEA Paris-Saclay

Cooperative Institutions

High Energy Accelerator Research Organization

207

European Organization for Nuclear Research

114

The University of Tokyo

107

Centre National de la Recherche Scientifique

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

The Graduate University for Advanced Studies, SOKENDAI

CEA Paris-Saclay

Institut de Recherche sur les Lois Fondamentales de l'Univers

A. Alikhanyan National Laboratory

Deutsches Elektronen-Synchrotron DESY

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STATUS OF MAIN LINAC CRYOMODULE DEVELOPMENT FOR COMPACT ERL PROJECT

Kensei Umemori Kazuhiro Enami T. Furuya Hiroshi Sakai M. Satoh

The Compact ERL, which is a test facility of ERL, is under construction at KEK, in Japan. For the main linac, one cryomodule, containing two 9-cell superconducting cavities, is under development. The cryomodule has been designed under High Pressure Gas Safety Act in Japan. Thermal design and cavity alignment have been also carefully considered. Two 9-cell cavities were fabricated and their performances were confirmed by vertical tests. They satisfied ERL main linac specifications. Their accelerating field reached to 25 MV/m without field limits. Two input couplers, three HOM absorbers and two Slide-Jack tuners were also fabricated for the cERL main linac. High power conditioning of input couplers was successfully carried out, at a test stand using a 300 kW klystron. Cooling tolerance and thermal properties were tested for HOM absorbers. Performance studies were applied for the frequency tuner at room temperature condition. Cryomodule assembly is planned this summer. After cooling tests and high power tests, ERL beam operation will be started.

Klystron

Tuner

Superconducting radio frequency

Source

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Field Emission Studies on ESS Elliptical Prototype Cavities at CEA Saclay

HAL (Le Centre pour la Communication Scientifique Directe) (2019)

Enrico Cenni Matthieu Baudrier Guillaume Devanz Luc Maurice Olivier Piquet

10.18429/jacow-srf2019-thp097

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Forest Sharing® as an Innovative Facility for Sustainable Forest Management of Fragmented Forest Properties: First Results of Its Implementation

Land (2023)

Francesca Giannetti Andrea Laschi Ilaria Zorzi Cristiano Foderi Enrico Cenni

The forestry sector in Italy and throughout Europe is going through a critical period due to ongoing natural and anthropological processes, such as climate change and the abandonment of rural areas. These processes lead to a constant fragmentation of properties in small forest parcels, with direct impacts on management capacity. In this framework, new sustainable forest management methods are being tested and are shown to be good practices to oppose the decline of forest ecosystems. Their innovative aspects concern the introduction of a form of shared and circular economy, where management is built on the process, rather than on the product. Their technical activities are based on precision forestry systems and digitalization. The new approach takes into consideration the fact that the woods are an asset available to the whole community, in terms of benefits and protection. Forest Sharing® is an example of the application of shared forest management systems, due to which the owner user benefits from several services and opportunities, such as the advanced monitoring platform and the access to investment funds. After eighteen months of activity, the first results of the application of the new management systems can already be seen. Many aspects need further development, such as case studies concerning the enhancement due to forest certification and new recreational activities. Shared forest management systems have the potential to increase the level of knowledge and awareness of citizens about environmental and territorial issues.

Ecoforestry

Sustainable Forest Management

Certified wood

Forest product

Sustainable Management

10.3390/land12030521

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Field emission studies in vertical test and during cryomodule operation using precise x-ray mapping system

Physical Review Accelerators and Beams (2019)

Hiroshi Sakai Enrico Cenni Kazuhiro Enami T. Furuya M. Sawamura

Field emission is one of the most serious issues in the degradation of superconducting cavity performance. However, surveying field emission sources during the cavity performance test (called the ``vertical test'') and cryomodule operation is difficult. Therefore, to precisely investigate electron emissions from the field emission source, we developed a diagnostic system for the energy recovery linac 1.3 GHz nine-cell superconducting cavity for both vertical tests and the cryomodule operation. The developed system is comprised of two types of sensors: a carbon sensor and a Si $p$-$i$-$n$ diode, that measure the temperature rise and the radiation produced by electron emissions, respectively. Rotating the sensor array around the cavity axis in the vertical test provides detailed information on the entire cavity surface. The precise x-ray mapping profile measured by the system in the vertical test enables identification of the local emission source. This paper describes how the field emission source is identified in the vertical test from the standpoint of not only experimental results obtained with the newly developed rotating mapping system but also the detailed approach based on precise simulations. In addition, field emission studies with the optimized instrumentation have been extended to cryomodule tests, both standalone and in the beam line. These developments allow us to monitor changes in the cavity field emission signatures introduced by cryomodule assembly and beam operation.

Superconducting radio frequency

Instrumentation

10.1103/physrevaccelbeams.22.022002

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Citations (22)

Multipacting mitigation by atomic layer deposition: the case study of Titanium Nitride

arXiv (Cornell University) (2024)

Yasmine Kalboussi S. Dadouch Baptiste Delatte Frédéric Miserques Diana Dragoé

This study investigates the use of Atomic Layer deposition (ALD) to mitigate multipacting phenomena inside superconducting radio frequency (SRF) cavities used in particle accelerators. The unique ALD capability to control the film thickness down to the atomic level on arbitrary complex shape objects enable the fine tuning of TiN film resistivity and total electron emission yield (TEEY) from coupons to devices. This level of control allows us to adequately choose a TiN film thickness that provide both a high resistivity to prevent Ohmic losses and low TEEY to mitigate multipacting for the application of interest. The methodology presented in this work can be scaled to other domain and devices subject to RF fields in vacuum and sensitive to multipacting or electron discharge processes with their own requirements in resistivities and TEEY values

Deposition

10.48550/arxiv.2405.18949

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Indirect measurement of field emission electron current from the main superconducting cavities of compact ERL at KEK

EPJ Web of Conferences (2017)

Hiroshi Matsumura Hajime Nakamura Akihiro Toyoda K. Hozumi Hiroshi Sakai

The field emission electron currents from the main superconducting cavities (Cavities #3 and #4) of compact ERL at KEK, Japan, were estimated indirectly from photon dose rates measured around the cavities and on the roof of the compact ERL room. The field emission electron currents estimated from the photon dose rates measured around the cavities are in good agreement with those on the roof of the compact ERL room. The field emission electron currents increased steeply with the applied voltage. The field emission electron currents corresponding to the applied voltages were different between Cavity #3 and Cavity #4. We found that the field emission electron current exceeded 1 μA at 13.5 MV for Cavity #3 and at 15.5 MV for Cavity #4. This result was used in considering unexpected loss of field emission electrons.

10.1051/epjconf/201715307011

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Development of Superconducting Spoke Cavities for Laser Compton Scattered X-ray Sources

6th Int. Particle Accelerator Conf. (IPAC'15), Richmond, VA, USA, May 3-8, 2015 (2015)

Ryoichi Hajima Enrico Cenni Yoshihisa Iwashita Takayuki Kubo Takayuki Saeki

10.18429/jacow-ipac2015-wepma056

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ESS SRF Linear Accelerator Components Preliminary Results and Integration

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

Christine Darve Christian Arcambal Enrico Cenni Gabriele Costanza Guillaume Devanz

The European Spallation Source (ESS) is a pan-European project and one of world's largest research infrastructures based on neutron sources. This collaborative project is funded by a collaboration of 17 European countries and is under construction in Lund, Sweden. The 5 MW, 2.86 ms long pulse proton accelerator has a repetition frequency of 14 Hz (4 % duty cycle), and a beam current of 62.5 mA. The Superconducting Radio-Frequency (SRF) linac is composed of three families of Superconducting Radio-Frequency (SRF) cavities, which are being prototyped, counting the spoke resonators with a geometric beta of 0.5, medium-beta elliptical cavities (beta_{g}=0.67) and high-beta elliptical cavities (beta_{g}=0.86). After a description of the ESS linear accelerator layout, this article will focus on the recent progress towards integration of the first test results of the main critical components to be assembled in cryomodules, then in the ESS tunnel.

Superconducting radio frequency

Spallation Neutron Source

Duty cycle

10.18429/jacow-ipac2017-thobb3

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Citations (1)

HOM Excitation in Spoke Resonator for SRF Studies

HAL (Le Centre pour la Communication Scientifique Directe) (2021)

David Longuevergne Matthieu Baudrier Natacha Bippus Enrico Cenni F. Chatelet

10.18429/jacow-srf2021-tupcav002

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