Keyword: vacuum
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MOPOPA13 200 MV Record Voltage of vCM and LCLS-II-HE Cryomodules Production Start Fermilab cavity, cryomodule, SRF, plasma 95
 
  • T.T. Arkan, D. Bafia, D.J. Bice, J.N. Blowers, A.T. Cravatta, B. Giaccone, C.J. Grimm, B.D. Hartsell, J.A. Kaluzny, M. Martinello, T.H. Nicol, Y.M. Orlov, S. Posen
    Fermilab, Batavia, Illinois, USA
  • M. Checchin
    SLAC, Menlo Park, California, USA
  
  Funding: Department of Energy
The Linac Coherent Light Source (LCLS) is an X-ray science facility at SLAC National Accelerator Laboratory. The LCLS-II project (an upgrade to LCLS) is in the commissioning phase; the LCLS-II-HE (High Energy) project is another upgrade to the facility, enabling higher energy operation. An electron beam is accelerated using superconducting radio frequency (SRF) cavities built into cryomodules. It is planned to build 24 1.3 GHz standard cryomodules and 1 1.3 GHz single-cavity Buncher Capture Cavity (BCC) cryomodule for the LCLS-II-HE project. Fourteen of these standard cryomodules and one BCC are planned to be assembled and tested at Fermilab. Procurements for standard cryomodule components are nearing completion. The first LCLS-II-HE cryomodule, referred to as the verification cryomodule (vCM) was assembled and tested at Fermilab. Fermilab has completed the assembly of the second cryomodule. This paper presents LCLS-II-HE cryomodule production status at Fermilab, emphasizing the changes done based on the successes, challenges, mitigations, and lessons learned from LCLS-II; validation of the changes with the excellent vCM results. 		 
poster icon Poster MOPOPA13 [1.975 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA13  
About • Received ※ 10 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 09 September 2022
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MOPOPA17 RF Commissioning of the First-of-Series Cavity Section of the Alvarez 2.0 at GSI cavity, DTL, operation, coupling 106
 
  • M. Heilmann, L. Groening, C. Herr, M. Hoerr, S. Mickat, B. Schlitt, G. Schreiber
    GSI, Darmstadt, Germany
  
  The existing post-stripper DTL of the GSI UNILAC will be replaced with the new Alvarez 2.0 DTL to serve as the injector chain for the Facility of Antiproton and Ion Research (FAIR). The 108.4 MHz Alvarez 2.0 DTL with a total length of 55 meters has an input energy of 1.36 MeV/u and the output energy is 11.32 MeV/u. The presented First-of-Series (FoS) cavity section with 11 drift tubes and a total length of 1.9 m is the first part of the first cavity of the Alvarez 2.0 DTL. After copper plating and assembly of the cavity the RF-conditioning started in July 2021. These proceeding gives an overview on the results of the successfully RF-conditioning to reach the necessary gap voltage for uranium operation including a comfortable safety margin.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA17  
About • Received ※ 24 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022  
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MOPOPA20 Q Drop Tendency of Half-Wave Resonator Cavity cavity, radiation, ECR, superconducting-cavity 118
 
  • Y. Jung, H. Jang, H. Kim, H. Kim, J.W. Kim
    IBS, Daejeon, Republic of Korea
  • S. Jeon
    Kyungpook National University, Daegu, Republic of Korea
  
  All HWRs (half-wave resonator superconducting cavities) have been fabricated and installed in the low energy section of the LINAC in IBS. All HWR cavities have been tested (vertical tests, VT) both at 4.2 K and 2.1 K cryogenic surroundings although operating temperature of HWRs is 2.1 K. Good cavities of high quality factors showed the Q drop tendency of 2.1 k were very similar to that of 4.2 K. However, in many cases, Q drop tendency of 2.1 K were not similar with 4.2 K, rather Q decreased more rapidly than 4.2 K which means the surface resistance of the cavity rapidly increased at 2 K surrounding. In this study, we will report that various Q results of HWRs and compare their Q drop tendency as a function of temperature, 2.1 K and 4.2 K.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA20  
About • Received ※ 23 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022
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MOPOGE06 Automatic RF Conditioning of S-Band Cavities for Commercial Proton Therapy Linacs cavity, controls, linac, GUI 154
 
  • S. Benedetti, M. Cerv, S. Magnoni, J.L. Navarro Quirante, S.G. Soriano
    AVO-ADAM, Meyrin, Switzerland
  
  The CERN spinoff company ADAM owned by Advanced Oncotherapy plc (AVO-ADAM) is completing the construction and testing of its first LIGHT (Linac for Image-Guided Hadron Therapy) system. Each LIGHT machine is composed by 20 accelerating modules: one 750 MHz RFQ, four 3 GHz Side-Coupled Drift Tube Linac (SCDTL) and 15 3 GHz Coupled-Cavity Linac (CCL). The company aims at delivering several similar LIGHT machines in the next years. A prerequisite to achieve such goal is the capability to complete the RF conditioning of the accelerating modules in a systematic and automatic way, with minimal inputs from RF engineers. In the past years ADAM developed an automatic conditioning system capable of increasing the main conditioning parameters ’ RF power, pulse width, repetition rate ’ while controlling the cavity breakdown rate and vacuum level. The system has been so far tested on about twenty accelerating structures with different brazing methodologies and RF accelerating voltages, proving its robustness. This paper discusses the ADAM automatic conditioning system design and its implementation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE06  
About • Received ※ 13 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 31 August 2022
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MOPOGE11 Update on the First 3D Printed IH-Type Linac Structure - Proof-of-Concept for Additive Manufacturing of Linac RF Cavities cavity, linac, simulation, experiment 170
 
  • H. Hähnel, A. Ateş, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  Funding: This research was funded by BBMBF grant number 05P21RFRB2.
Additive manufacturing ("AM" or "3D printing") has become a powerful tool for rapid prototyping and manufacturing of complex geometries. A 433 MHz IH-DTL cavity has been constructed to act as a proof of concept for additive manufacturing of linac components. In this case, the internal drift tube structure has been produced from 1.4404 stainless steel using AM. We present the concept of the cavity as well as first results of vacuum testing, materials testing and low level rf measurements. Vacuum levels sufficient for linac operation have been reached with the AM linac structure. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE11  
About • Received ※ 22 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 02 September 2022  
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MOPORI01 A Multi-Camera System for Tomographic Beam Diagnostics detector, controls, synchrotron, diagnostics 215
 
  • A. Ateş, G. Blank, H. Hähnel, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  A prototype of a beam-induced residual gas fluorescence monitor (BIF) has been developed and successfully tested at the Institute of Applied Physics (IAP) of the Goethe University Frankfurt. This BIF is based on ten single-board cameras inserted into the vacuum and directed onto the beam axis. The overall goal is to study the beam with tomography algorithms at a low energy beam transport section. Recently, we tested the detector with a 60keV, 15mA proton beam at 20Hz and 1ms puls length. In this paper we present the ongoing investigations on image processing and application of the algebraic reconstruction technique (ART).  
poster icon Poster MOPORI01 [1.826 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI01  
About • Received ※ 20 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 01 September 2022
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MOPORI06 Improvements on the Modified Nomarski Interferometer for Measurements of Supersonic Gas Jet Density Profiles laser, experiment, focusing, diagnostics 235
 
  • C. Swain, O. Apsimon, A. Salehilashkajani, C.P. Welsch, J. Wolfenden, H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • Ö. Apsimon, A. Salehilashkajani, C. Swain, C.P. Welsch, J. Wolfenden, H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: This work is supported by the AWAKE-UK phase II project funded by STFC, the STFC Cockcroft core grant No. ST/G008248/1 and the HL-LHC-UK phase II project funded by STFC under Grant Ref: ST/T001925/1.
For supersonic gas jet based beam profile monitors such as that developed for the High Luminosity Large Hadron Collider (HL-LHC) upgrade, density profile is a key characteristic. Due to this, non-invasive diagnostics to study the jet’s behaviour have been designed. A Nomarski interferometer was constructed to image jets 30 um to 1 mm in diameter and study changes in their density. A microscope lens has been integrated into the original interferometer system to capture phase changes on a much smaller scale than previous experiments have achieved. This contribution presents the optimisation and results gained from this interferometer. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI06  
About • Received ※ 14 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 01 September 2022
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MOPORI11 Seismic Analysis for Safety Requirements of SPIRAL2 Accelerator experiment, detector, simulation, linac 252
 
  • C. Barthe-Dejean, F. Lutton, M. Michel
    GANIL, Caen, France
  
  The SPIRAL2 Accelerator at GANIL is a superconducting ion continuous wave LINAC with two associated experimental areas. Mechanical engineers have been highly involved in the design of SPIRAL2 equipments since the beginning of the project in 2004. During the development phase, Computer Aided Design and calculation codes have been used throughout the complete process : from the ion sources, the LINAC, the beam transport lines and the experimental halls equipped with detectors. SPIRAL2 has to meet different safety requirements, among which seismic hazard. This involves justifying that the integrity of the radiologic containment barrier is always maintained in case of earthquake. This paper reports the improvement in design and calculation methods performed by GANIL engineers to meet the seismic safety requirements, specificly the non-missility feature of the equpiment. The modal-spectral simulations, used to demonstrate the mechanical strength of equipments in case of earthquakes, was an important part of this design activity in the past 10 years New methods have been used to calculate welds, fasteners and the ground anchor of the structural supports of the heaviest equipments.
C. Barthe-Dejean, F. Lutton, « Guide methodologique pour Calculs de Tenue aux Séismes des équipements mécaniques », Note STP-535-A 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI11  
About • Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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MOPORI13 On the UNILAC Pulsed Gas Stripper at GSI operation, target, controls, heavy-ion 258
 
  • P. Gerhard, M.T. Maier
    GSI, Darmstadt, Germany
  
  The UNILAC will serve as injector linac for heavy ion beams for the future FAIR, with the commissioning being anticipated in 2025. One of the crucial steps in the course of acceleration along the UNILAC is the stripping of the ions by a gas stripper in front of the main linac. Its efficiency is decisive in reaching the intensities required and may be increased by more than 50% by introducing hydrogen as stripping target, instead of the nitrogen used so far. This requires the stripper to be operated in a pulsed mode, since otherwise the pumping speed is not sufficient to maintain suitable vacuum conditions. The proof of principle was demonstrated in 2016*. A dedicated project aims for a setup suitable for routine operation. Main issues are safety, reliability and automated operation. We report on the development done since 2016 and give an overview of the realisation coming within the next few years. Results from systematic measurements on the properties of the valves and their impact on the properties of the stripping target are presented.
* P. Scharrer et al., Developments on the 1.4 MeV/u Pulsed Gas Stripper Cell, in Proc. LINAC2016, East Lansing, MI, USA, Sep. 2016. https://doi.org/10.18429/JACoW-LINAC2016-TUOP03 		 
poster icon Poster MOPORI13 [1.908 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI13  
About • Received ※ 05 August 2022 — Accepted ※ 14 August 2022 — Issue date ※ 02 September 2022  
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MOPORI18 Overview of STFC Daresbury Laboratory Vacuum Operations for the Testing of ESS High Beta Cavities. cavity, SRF, operation, detector 268
 
  • S. Wilde, K.J. Middleman, M.D. Pendleton, J.O.W. Poynton
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • D.A. Mason, G. Miller, J. Mutch
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • K.J. Middleman
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  This paper describes the vacuum systems and operations that are used at the STFC Daresbury Laboratory SuRF lab during cold RF testing of ESS high beta RF accelerating cavities. Dedicated slow pump slow vent (SPSV) systems are used to perform vacuum acceptance testing of each cavity before, during and after cold RF testing. Details of the vacuum systems, support facilities, acceptance criteria and test results will be discussed in detail.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI18  
About • Received ※ 24 August 2022 — Revised ※ 01 September 2022 — Accepted ※ 02 September 2022 — Issue date ※ 09 September 2022
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MOPORI20 Fabrication, Field Measurement, and Testing of a Compact RF Deflecting Cavity for ELBE cavity, pick-up, resonance, simulation 271
 
  • T.G. Hallilingaiah, P. Michel, U. van Rienen
    Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
  • A. Arnold, S. Köppen, P. Michel
    HZDR, Dresden, Germany
  • U. van Rienen
    University of Rostock, Rostock, Germany
  
  A transverse deflecting cavity is being developed for the electron linac ELBE to separate the bunches into two or more beamlines so that multiple user experiments can be carried out simultaneously. A normal conducting double quarter-wave cavity has been designed to deliver a transverse kick of 300 kV when driven by an 800 W solid-state amplifier at 273 MHz. The main challenges in fabrication were machining the complex cavity parts with high precision, pre-tuning the cavity frequency, and the final vacuum brazing within the tolerances, which are described in this paper. The reason for a low intrinsic quality factor measured during the low power test was investigated, and suitable steps were taken to improve the quality factor. The cavity field profiles obtained from the bead-pull measurement matched the simulation results. Further, the cavity was driven up to 1 kW using a modified pick-up antenna, and eventually, vacuum conditioning of the cavity was accomplished. The cavity fulfils the design requirements and is ready for beam tests.  
poster icon Poster MOPORI20 [4.325 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI20  
About • Received ※ 14 August 2022 — Revised ※ 15 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 07 September 2022
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MOPORI24 Monte Carlo Model of High-Voltage Conditioning and Operation cavity, simulation, linac, HOM 283
 
  • W.L. Millar, W. Wuensch
    CERN, Meyrin, Switzerland
  • G. Burt
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  
  To synthesise the experimental results and theory pertaining to high-field phenomena, a model has been developed to simulate the conditioning and operation of high-field systems. By using a mesh-based method, the high-field conditioning of any arbitrary geometry and surface electric field distribution may be simulated for both RF and DC devices. Several phenomena observed in previous high-field tests such as the probabilistic behaviour of vacuum arcs and the inhomogeneous distribution of arc locations are described by this approach.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI24  
About • Received ※ 20 August 2022 — Revised ※ 22 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 15 September 2022
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TU1AA03 R&D Towards High Gradient CW SRF Cavities cavity, SRF, niobium, cryomodule 295
 
  • D. Bafia, P. Berrutti, B. Giaccone, A. Grassellino, D.V. Neuffer, S. Posen, A.S. Romanenko
    Fermilab, Batavia, Illinois, USA
  
  This talk will discuss Fermilab’s recent progress in the surface engineering of superconducting radio-frequency (SRF) cavities geared toward producing simultaneously high quality factors and high accelerating gradients in cryomodules. We investigate possible microscopic mechanisms that drive improved performance by carrying out sequential RF tests on cavities subjected to low temperature baking. We compare performance evolution to observations made with material science techniques and find correlations with material parameters. We also discuss other key advancements that enable high gradient operation in cryomodules.  
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slides icon Slides TU1AA03 [2.007 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU1AA03  
About • Received ※ 20 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 16 October 2022
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TU1AA04 SWELL and Other SRF Split Cavity Development cavity, HOM, GUI, SRF 300
 
  • F. Peauger
    CERN, Meyrin, Switzerland
  
  An innovative superconducting cavity topology has been recently proposed at CERN and at Lancaster University. It integrates longitudinal slots crossing perpendicularly the RF surface. The RF current lines run along the slots, inducing no perturbation of the accelerating mode. Thanks to this approach, the cavity can be built using halves or quadrants, which is well appropriate to precise manufacturing techniques. This configuration allows direct access to the RF surface, thus facilitating the surface preparation and thin film deposition process in the case of cavities based on Nb/Cu technology. The contact faces between the cavity parts are moved to the slots’ ends where the electromagnetic fields are extremely low, thus relaxing the constraints on the quality of the assembly joints. This paper covers the latest development of a 600 MHz slotted elliptical cavity called SWELL, which has been proposed as an alternative option for the FCC-ee RF system as well as a simplified SWELL version of a single cell 1.3 GHz elliptical cavity and a new 6 GHz split resonator made of two halves for superconducting thin film characterization.
Acknowledgement of U. Van Rienen from Rostock University for the use of their GPU based workstations for RF simulations. 		 
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slides icon Slides TU1AA04 [4.217 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU1AA04  
About • Received ※ 14 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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TUPOJO04 R&D for the Realization of a Very High Frequency Crossbar H-Mode Drift Tube Linac cavity, DTL, linac, coupling 341
 
  • M. Heilmann, C. Zhang
    GSI, Darmstadt, Germany
  • H. Podlech
    IAP, Frankfurt am Main, Germany
  
  A 704.4 MHz Crossbar H-mode (CH) drift tube linac has been proposed for performing a radio frequency jump at ß = 0.2. Up to now, the highest frequency of the constructed CH cavities is 360 MHz. Simulations have shown that the operation frequency for an H210-mode cavity can be up to ~800 MHz. At 704.4 MHz, the cavity dimensions become small, which bring challenges for many practical problems e.g. construction, vacuum pumping and RF coupling. This paper presents the performed R&D studies for the realization of such a very high frequency cavity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO04  
About • Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 31 August 2022
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TUPOJO09 High Power RF Conditioning of the ESS DTL1 DTL, cavity, controls, operation 356
 
  • F. Grespan, C. Baltador, L. Bellan, D. Bortolato, M. Comunian, E. Fagotti, M.G. Giacchini, M. Montis, A. Palmieri, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • F. Grespan, B. Jones, L. Page, A.G. Sosa, E. Trachanas, R. Zeng
    ESS, Lund, Sweden
  • D.J.P. Nicosia
    CERN, Meyrin, Switzerland
  
  The first tank of Drift Tube Linac (DTL) for the European Spallation Source ERIC (ESS), delivered by INFN, has been installed in the ESS tunnel in Summer 2021. The DTL-1 is designed to accelerate a 62.5 mA proton beam from 3.62 MeV up to 21 MeV. It consists of 61 accelerating gaps, alternate with 60 drift tubes equipped with Permanent Magnet Quadrupole (PMQ) in a FODO lattice. The remaining drift tubes are equipped with dipole correctors (steerers), beam position monitors (BPMs) or empty. The total length of the cavity is 7.6 m and it is stabilized by post couplers. Two waveguide couplers feed the DTL with the 2.2 MW of RF power required for beam operation, equally divided by RF power losses and beam power. This paper first presents the main systems required for the DTL conditioning. Then it summarizes the main steps and results of this high power RF conditioning done at ESS to prepare the DTL for the consequent beam commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO09  
About • Received ※ 15 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 15 September 2022
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TUPOJO15 Commissioning of UKRI-STFC SRF Vertical Test and HPR Reprocessing Facility cavity, SRF, MMI, cryogenics 380
 
  • M.D. Pendleton, A.E.T. Akintola, R.K. Buckley, G. Collier, K.D. Dumbell, M.J. Ellis, S. Hitchen, P.C. Hornickel, G. Hughes, C.R. Jenkins, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, J.O.W. Poynton, P.A. Smith, A.E. Wheelhouse, S. Wilde
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • G. Jones, M. Lowe, D.A. Mason, G. Miller, C. Mills, J. Mutch, A. Oates, J.T.G. Wilson
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  
  Mark Pendleton, et al. The UK’s first and only vertical test facility and associated cleanroom reprocessing suite has been developed, commissioned, and entered steady-state operations at the UKRI-STFC Daresbury Laboratory. The facility is capable of 2 K testing of 3 jacketed SRF cavities in a horizontal configuration per 2-week test cycle. We report on the associated cryogenic, RF, UHV, mechanical, cleanroom, and HPR infrastructure. SRF cavity workflows have been developed to meet the requirements of the ESS high beta cavity project within a newly developed quality management system, SuraBee, in accordance with ISO9001. To support standardisation of measurements across the collaboration, reference cavities have been measured for cross-reference between CEA, DESY, and UKRI-STFC. We further report on commissioning objectives, observations, and continuous improvement activities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO15  
About • Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 08 September 2022
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TUPOJO20 Progress of the ESS Proton Beam Imaging Systems target, proton, radiation, electronics 394
 
  • E. Adli, G. Christoforo, E.D. Fackelman, H.E. Gjersdal, O. Røhne, K.N. Sjobak
    University of Oslo, Oslo, Norway
  • S. Bjorklund, S. Joshi
    University College West, Trollhätan, Sweden
  • M.G. Ibison
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • M.G. Ibison
    The University of Liverpool, Liverpool, United Kingdom
  • Y. Levinsen, K.E. Rosengren, T.J. Shea, C.A. Thomas
    ESS, Lund, Sweden
  
  The ESS Target Proton Beam Imaging System has as objective to image the 5 MW ESS proton beam as it enters the spallation target. The Imaging System has to operate in a harsh radiation environment, leading to a number of challenges : development of radiation hard photon sources, long and aperture-restricted optical paths and fast electronics required to provide rapid information in case of beam anomalies. This paper outlines how main challenges of the Imaging System have been addressed, and the status of deployment as ESS gets closer to beam.  
poster icon Poster TUPOJO20 [21.417 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO20  
About • Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022
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TUPOJO23 Accelerated Lifetime Test of Spoke Cavity Cold Tuning Systems for Myrrha cavity, cryomodule, operation, SRF 406
 
  • N. Gandolfo, S. Blivet, F. Chatelet, V. Delpech, D. Le Dréan, G. Mavilla, M. Pierens, H. Saugnac
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  
  Within the framework of MINERVA, the first Phase of MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) project, IN2P3 labs are in charge of the developments of several accelerator elements. Among those, a fully equipped Spoke cryomodule prototype was constructed, it integrates two superconducting single spoke cavities operating at 2K, the RF power couplers and the associated cold tuning systems. The extreme reliability specified for this project motivated to conduct ALT (Accelerated Lifetime Test) on two extra cold tuning systems in cryomodule like environment. Thus, by gathering information from experimental data, many aspects can be enhanced like maintenance plan consolidation, determination of aging indicators and design optimization of the whole system and its sub components. This paper describes the complete ALT process from the studying elements and the test environment design, to the experimental results and findings.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO23  
About • Received ※ 15 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 02 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPOPA03 Status and RF Devopments of ESS Bilbao RFQ rfq, klystron, operation, coupling 410
 
  • N. Garmendia, I. Bustinduy, A. Conde, P.J. González, A. Kaftoosian, J. Martin, S. Masa, J.L. Muñoz, .A. Rodríguez Páramo
    ESS Bilbao, Zamudio, Spain
  
  Within the framework of the plans for study of a light-ion linear accelerator, ESS Bilbao is manufacturing a radio frequency quadrupole (RFQ) aimed at accelerating up to 3 MeV the protons generated in the ion source. The progress made and the difficulties encountered with the RFQ are discussed in this paper. A power coupler proto-type for the RFQ has been developed while several me-chanical constraints were also studied in the final cou-pler. This prototype operates at a lower power, then it can work using PEEK window for the vacuum interface and it does not require neither brazing nor cooling system. Also, a complete RF test stand is being implemented to perform the high-power conditioning in traveling and standing wave mode, to verify the power handling capa-bility of the coupler and its thermal behaviour. The RF test stand, based on EPICS environment, can provide up to 2 MW peak power at 352.2 MHz in a pulse operation of 14 Hz and a duty cycle of 4.9%.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA03  
About • Received ※ 09 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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TUPOPA11 Compact Proton Accelerator in UHF Band At KAHVELab rfq, cavity, proton, quadrupole 434
 
  • S. Esen, A. Adiguzel, O. Kocer, S. Oz
    Istanbul University, Istanbul, Turkey
  • A. Caglar
    YTU, Istanbul, Turkey
  • E. Celebi, E.V. Ozcan
    Bogazici University, Bebek / Istanbul, Turkey
  • E. Celebi
    IBU, Istanbul, Turkey
  • A.K. Karatay, F. Yaman, Ö.H. Yilmaz
    IZTECH, Izmir, Turkey
  • U. Kaya
    Istinye University, Institute of Sciences, Istanbul, Turkey
  • A. Kilicgedik
    Marmara University, Istanbul, Turkey
  • G. Türemen
    Turkish Atomic Energy Authority, Ankara, Turkey
  • G. Unel
    UCI, Irvine, California, USA
  
  Funding: This project are supported by TUBITAK Project no: 118E838
Proton Test Beam at KahveLAB (Kandilli Detector, Accelerator and Instrumentation Laboratory) project aims to design and produce a radio frequency quadrupole (RFQ) operating at 800 MHz in Istanbul, Turkey using the local resources. The beamline consists of a proton source, a low energy beam transport (LEBT) line including the beam diagnostic section, and the RFQ cavity itself. This RFQ is a 4-vane, 1-meter-long cavity to accelerate the 20 keV beam extracted from the plasma ion source to 2 MeV. Its engineering prototype is already produced and subjected to mechanical, low-power RF, and vacuum tests. In this poster, the results of the first test production, especially the bead-pull test setup will be discussed. 		 
poster icon Poster TUPOPA11 [16.128 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA11  
About • Received ※ 21 August 2022 — Revised ※ 22 August 2022 — Accepted ※ 12 September 2022 — Issue date ※ 26 September 2022
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TUPOPA13 Pulsed DC High Field Measurements of Irradiated and Non-Irradiated Electrodes of Different Materials radiation, rfq, cathode, linac 441
 
  • R.C. Peacock, G. Burt
    Lancaster University, Lancaster, United Kingdom
  • G. Bellodi, S. Calatroni, C.F. Da Palma Serafim, A. Grudiev, A.M. Lombardi, A.T. Perez Fontenla, S. Ramberger, E. Sargsyan, S. Sgobba, W. Wuensch
    CERN, Meyrin, Switzerland
  
  Beam loss occurs in Radio Frequency Quadrupoles (RFQ), and has been observed in the H− linear accelerator Linac4 (L4) at CERN. To determine if beam loss can induce breakdowns, and to compare the robustness of different materials, tests have been done using pulsed high-voltage DC systems. Electrical breakdown phenomena and conditioning processes have been studied using these systems. Cathodes of different materials were irradiated with 1.2x1019 H− p/cm2, the estimated beam loss of the L4 RFQ over 10 days. The irradiated electrodes were installed in a system to observe if the irradiated area coincided with the breakdown locations, with pulsing parameters similar to the RFQ. Tests of irradiated and non-irradiated electrodes of the same material were done for comparison. The main difference observed was an increase in the number of breakdowns during the initial conditioning that returned to non-irradiated sample values with further running. Visual observations after irradiation show the beam centre and a halo the same diameter of the beam pipe. Breakdown clusters occur in the centre and halo regions, suggesting irradiation is not the only factor determining the breakdown probability.  
poster icon Poster TUPOPA13 [3.845 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA13  
About • Received ※ 23 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 07 September 2022
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TUPOPA25 Design, Manufacturing, Assembly, Testing, and Lessons Learned of the Prototype 650 MHz Couplers SRF, cryomodule, cavity, multipactoring 462
 
  • J. Helsper, S.K. Chandrasekaran, F. Furuta, B.M. Hanna, S. Kazakov, J.P. Ozelis, K.S. Premo, N. Solyak, G. Wu
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported, in part, by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under U.S. DOE Contract No. DE-AC02-07CH11359.
Six 650 MHz high-power couplers will be integrated into the prototype High Beta 650 MHz (HB650) cryomodule for the PIP-II project at Fermilab. The design of the coupler is described, including design optimizations from the previous generation. This paper then describes the coupler life-cycle, including manufacturing, assembly, testing, conditioning and the lessons learned at each stage. 		 
poster icon Poster TUPOPA25 [2.695 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA25  
About • Received ※ 24 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 02 September 2022
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TUPOGE01 Commissioning of the VECC Cryomodule cavity, solenoid, MMI, ISAC 476
 
  • Z.Y. Yao, R. Bjarnason, J. Cheung, K. Fong, J.J. Keir, D. Kishi, S. Kiy, P. Kolb, D. Lang, R.E. Laxdal, B. Matheson, R.S. Sekhon, B.S. Waraich, Q. Zheng, V. Zvyagintsev
    TRIUMF, Vancouver, Canada
  
  A quarter-wave resonator (QWR) cryomodule was designed and assembled at TRIUMF for the energy upgrade of the VECC ISOL-RIB facility to boost radioactive isotopes from 1MeV/u to 2MeV/u. The top loading cryomodule was chosen based on the ISAC-II low energy section design, consisting of four superconducting QWRs and one superconducting solenoid. The major change from ISAC-II concept is separating the RF space vacuum from the isolation vacuum. The cryogenic commissioning was recently completed. The cold mass alignments and the cryogenic heat loads were measured. The cavity performance was qualified in both test regime and operating regime. The cavity degradations caused by magnetic pollution from solenoid and the recovery procedure were verified. This paper will report the detailed results of the commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE01  
About • Received ※ 23 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 03 September 2022
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TUPOGE06 Performance Test of Mass-Production of HWR Cryomodules for SCL32 cavity, cryomodule, multipactoring, linac 491
 
  • Y. Kim, J.W. Choi, D.H. Gil, H. Jang, Y.W. Jo, J. Joo, H.C. Jung, H. Kim, M.S. Kim, M. Kwon, M. Lee, J.H. Shin
    IBS, Daejeon, Republic of Korea
  • Y.U. Sohn
    PAL, Pohang, Republic of Korea
  
  Funding: This work was supported by the Rare Isotope Science Project of Institute for Basic Science funded by Ministry of Science and ICT and NRF of Korea (2013M7A1A1075764)
Mass production of the HWR (half wave resonator) cryomodules for SCL32 of RAON had been conducted since 2018 and all cryomodules were installed in the SCL3 tunnel in 2021. Total number of the HWR cavities and the HWR cryomodules are 106 and 34, respectively. Cryomodule performance test was started in September 2020 and finished in October 2021, except for one bunching cryomodule that will be installed in front of the high energy linac. The detailed procedure and the results of performance test is reported in detail. 		 
poster icon Poster TUPOGE06 [1.211 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE06  
About • Received ※ 14 August 2022 — Revised ※ 23 August 2022 — Accepted ※ 12 September 2022 — Issue date ※ 15 September 2022
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TUPOGE10 A Final Acceptance Test Kit for Superconducting RF Cryomodules cryomodule, cavity, cryogenics, SRF 504
 
  • A.J. May, A.E.T. Akintola, S.M. Pattalwar, A. White
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  UKRI-STFC Daresbury Laboratory is currently undertaking several projects involving assembly of superconducting RF cryomodules, including HL-LHC crab cavities and PIP-II HB650 cavities. As part of the final acceptance tests before shipping of the modules, extensive leak testing, pressure testing, and thermal cycling with gaseous and liquid must be performed. A Final Acceptance Test kit (FAT-kit) has been developed to support these tests. The FAT-kit, designed as a single portable unit, sits as an interface module between the cryomodule under test and the required utilities (liquid cryogen supply and return, gaseous cryogen supply and return, warm gas supply and return, vacuum pumps, leak detectors, etc.). The kit features a valve manifold to make or break connections to, from, and between circuits in the cryomodule, safety groupings to provide protection for the circuits as required, and various instrumentation. We report here on the design and commissioning of the kit.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE10  
About • Received ※ 23 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 15 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPOGE12 Final Design of the Pre-Production SSR2 Cryomodule for PIP-II Project at Fermilab cryomodule, cavity, alignment, solenoid 511
 
  • J. Bernardini, C. Boffo, M. Chen, J. Helsper, M. Kramp, F.L. Lewis, T.H. Nicol, M. Parise, D. Passarelli, V. Roger, G.V. Romanov, B. Squires, M. Turenne
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by Fermi Research Alliance, LLC under Contract No. DEAC02- 07CH11359 with the United States Department of Energy, Office of Science, Office of High Energy Physics.
The present contribution reports the design of the pre-production Single Spoke Resonator Type 2 Cryomodule (ppSSR2 CM), developed in the framework of the PIP-II project at Fermilab. The innovative design is based on a structure, the strongback, which supports the coldmass from the bottom, stays at room temperature during operations, and can slide longitudinally with respect to the vacuum vessel. The Fermilab style cryomodule developed for the prototype Single Spoke Resonator Type 1 (pSSR1) and the prototype High Beta 650 MHz (pHB650) cryomodules is the baseline of the current design, which paves the way for production SSR1 and SSR2 cryomodules for the PIP-II linac. The focus of this contribution is on the results of calculations and finite element analysis performed to optimize the critical components of the cryomodule: vacuum vessel, strongback, thermal shield, and magnetic shield. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE12  
About • Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
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TUPOGE13 Niobium to Titanium Electron Beam Welding for SRF Cavities niobium, cavity, SRF, linac 515
 
  • M. Parise, J. Bernardini, D. Passarelli
    Fermilab, Batavia, Illinois, USA
  
  Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
Titanium and niobium are the main materials used for the fabrication of Superconducting Radio Frequency (SRF) cavities. These two metals are usually joined , using various welding techniques, using a third material in between. This contribution focuses on the development of an innovative electron beam welding technique capable of producing a strong bond between these two different materials. Several samples are produced and tested to assess the mechanical strength at room and cryogenic temperature as well as the composition of the resulting welded joint. Also, the first units of the Single Spoke Resonator type 2 (SSR2) cavities for the Proton Improvement Plan-II (PIP-II [1]) have been fabricated joining directly various grades of titanium to niobium and results gathered through the fabrication will be reported. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE13  
About • Received ※ 14 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPOGE14 Beamline Volume Relief Analysis for the PIP-II SSR2 Cryomodule at Fermilab cryomodule, cavity, SRF, radiation 519
 
  • M. Parise, J. Bernardini, D. Passarelli
    Fermilab, Batavia, Illinois, USA
  
  Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
The beam volume of the Pre-Production Single Spoke Resonator type 2 (ppSSR2) cryomodule [1] for the Proton Improvement Plan-II (PIP-II) [2] project will be protected against over-pressurization using a burst disk. This contri- bution focuses on the analysis of the relief of such trapped volume during a catastrophic scenario with multiple systems failures. An analytical model, able to predict the pressure in the beam volume depending of the various boundary condi- tions, has been developed and will be presented along with the results. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE14  
About • Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 02 September 2022
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TUPOGE16 Standardization and First Lessons Learned of the Prototype HB650 Cryomodule for PIP-II at Fermilab cryomodule, interface, cavity, SRF 526
 
  • V. Roger, J. Bernardini, S.K. Chandrasekaran, C.J. Grimm, O. Napoly, J.P. Ozelis, M. Parise, D. Passarelli
    Fermilab, Batavia, Illinois, USA
  • N. Bazin, R. Cubizolles
    CEA-IRFU, Gif-sur-Yvette, France
  
  Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
The prototype High Beta 650 MHz cryomodule (pHB650 CM) has been designed by an integrated design team, consisting of Fermilab (USA), CEA (France), STFC UKRI (UK), and RRCAT (India). The manufacturing and assembly of this prototype cryomodule is being done at Fermilab, whereas the production cryomodules will be manufactured and assembled by STFC-UKRI. As the first PIP-II cryomodule for which standardization was applied, the design, manufacturing and assembly of this cryomodule led to significant lessons being learnt and experiences gathered. These were incorporated into the design of the pre-production Single Spoke Resonator Type 2 cryomodule (ppSSR2 CM) and the pre-production Low Beta 650 MHz cryomodule (ppLB650 CM). This paper presents the pHB650 CM lessons learned and experiences gathered from the design to the lower coldmass assembly and how this cryomodule has a positive impact on all the next Proton Improvement Plan-II (PIP-II) cryomodules due to the standardization set up among SSR and 650 cryomodules. 		 
poster icon Poster TUPOGE16 [1.478 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE16  
About • Received ※ 11 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPOGE18 Operations of Copper Cavities at Cryogenic Temperatures cavity, cryogenics, coupling, experiment 533
 
  • H. Wang, U. Ratzinger, M. Schuett
    IAP, Frankfurt am Main, Germany
  
  This work is focused on the anomalous skin effect in copper and how it affects the efficiency of copper-cavities in the temperature range 40-50 K. The quality factor Q of three coaxial cavities was measured over the temperature range from 10 K to room temperature in the experiment. The three coaxial cavities have the same structure, but different lengths, which correspond to resonant frequencies: around 100 MHz, 220 MHz and 340 MHz. Furthermore, the effects of copper-plating and additional baking in the vacuum oven on the quality factor Q are studied in the experiment. The motivation is to check the feasibility of an efficient, pulsed, ion linac, operated at cryogenic temperatures.  
slides icon Slides TUPOGE18 [1.115 MB]  
poster icon Poster TUPOGE18 [1.518 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE18  
About • Received ※ 22 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 03 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPORI02 New Injection Beamline for TRIUMF Cyclotron injection, cyclotron, diagnostics, ion-source 545
 
  • M. Marchetto, R.A. Baartman, Y. Bylinskii, P.E. Dirksen, M. Ilagan, P.M. Jung, O. Law, R.E. Laxdal, S. Saminathan, V.A. Verzilov, V. Zvyagintsev
    TRIUMF, Vancouver, Canada
  • B. Dos Remedios
    UBC & TRIUMF, Vancouver, British Columbia, Canada
  
  The TRIUMF Ion Source and Injection System (ISIS) beamline is used to transport the 300 keV H− beam from the ion source to the injection into the 500 MeV cyclotron. The vertical section of the beamline, upgraded in 2011, is very robust and reliable, while the horizontal section, now 50 years old, is very demanding in maintenance, and presents a high risk of downtime due to aging. The horizontal beamline is being re-designed with well proven optical concepts, and modern UHV technologies already used in the vertical section, and in the ARIEL RIB transport system; this will produce a more efficient system, easier to maintain and tune. The beamline will use electrostatic optical modules like matching, periodic, and 90-degree achromatic bend sections; updated elements include bunchers, a high-energy pulser, a 5:1 selector, and a new set of diagnostics. A crucial aspect of the new beamline is a magnetic shield, to compensate the cyclotron stray field, comprised of a mu-metal in-vacuum liner allowing HV feedthroughs and diagnostics insertion without breaking the shield continuity. The new injection beamline will be controlled via EPICS. The paper will present the status of the project.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI02  
About • Received ※ 23 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 03 September 2022 — Issue date ※ 15 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPORI30 Application of Permanent Magnets in Solenoid and Quadrupole Focusing solenoid, quadrupole, permanent-magnet, focusing 622
 
  • J.D. Kaiser, A. Ateş, H. Hähnel, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  Permanent magnets can be used to design compact high gradient focusing elements for particle accelerators. Based on cheap industrial standard Neodym permanent magnets, design studies for Solenoids and Quadrupoles are presented. The Solenoid design consists of three segments, where the outer segments possess a radial magnetization and the inner segments an axial magnetization. This increases the mean field strength in comparison to a singlet hollow cylinder solenoid. The quadrupole design consists of 16 block magnets and is designed to be rather simplistic. The casing consists of two half shells, which can be easily mounted around a beam pipe. For a quadrupole triplet configuration the influence of different geometric parameters on beam transport regarding focusing strength and emittance growth is investigated. Furthermore, a variation of the quadrupole design was mounted in vacuum in a triplet configuration. Using custom 3D-printed mounts for small raspberry pi cameras the beam could be observed inside the quadrupoles. A first prototype was constructed  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI30  
About • Received ※ 13 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 04 September 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TH1AA04 Spatiotemporal Structure in Intense THz Pulsed Beams radiation, polarization, flattop, electron 663
 
  • G.A. Hine
    ORNL, Oak Ridge, Tennessee, USA
  
  Optically generated terahertz radiation, with gigavolt per meter (GV/m) electric fields accessible in tabletop experiments, provides a promising source of accelerating gradients for future particle accelerator applications. Manipulation and characterization of radiation is essential for efficiently producing high fields and effectively delivering them to an accelerating structure or interaction region. The talk will cover a method of generating and characterizing high quality and structured terahertz pulsed laser beams for compact particle acceleration.  
video icon
 
  please see instructions how to view/control embeded videos  
slides icon Slides TH1AA04 [1.126 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TH1AA04  
About • Received ※ 23 August 2022 — Revised ※ 07 September 2022 — Accepted ※ 26 September 2022 — Issue date ※ 12 October 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TH1AA05 R&D of Liquid Lithium Stripper at FRIB experiment, heavy-ion, controls, operation 668
 
  • T. Kanemura, N.K. Bultman, R. Madendorp, F. Marti, T. Maruta, Y. Momozaki, J.A. Nolen, P.N. Ostroumov, A.S. Plastun, J. Wei, Q. Zhao
    FRIB, East Lansing, Michigan, USA
  • D.B. Chojnowski, Y. Momozaki, J.A. Nolen, C.B. Reed, J.R. Specht
    ANL, Lemont, Illinois, USA
  • M.J. LaVere
    MSU, East Lansing, Michigan, USA
  
  Funding: The U.S. Department of Energy, Office of Science, Office of Nuclear Physics. The Facility for Rare Isotope Beams (FRIB) is a DOE Office of Science User Facility under Award Number DE-SC0000661
Charge stripping is one of the most important processes in the acceleration of intense heavy ion beams, and the charge stripper greatly affects the performance of the accelerator facility. In this talk, the design method and the achieved performance of the liquid lithium stripper recently developed for FRIB will be reported. 		 
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  please see instructions how to view/control embeded videos  
slides icon Slides TH1AA05 [1.663 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TH1AA05  
About • Received ※ 10 August 2022 — Revised ※ 20 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 16 September 2022
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THPOJO03 RF Performance of a Next-Generation L-Band RF Gun at PITZ gun, cavity, electron, FEL 699
 
  • M. Krasilnikov, Z. Aboulbanine, G.D. Adhikari, N. Aftab, P. Boonpornprasert, M.E. Castro Carballo, G.Z. Georgiev, J. Good, M. Groß, A. Hoffmann, C. Koschitzki, X.-K. Li, A. Lueangaramwong, D. Melkumyan, R. Niemczyk, A. Oppelt, B. Petrosyan, S. Philipp, M. Pohl, H.J. Qian, C.J. Richard, J. Schultze, F. Stephan, G. Vashchenko, T. Weilbach
    DESY Zeuthen, Zeuthen, Germany
  • M. Bousonville, F. Brinker, M. Hoffmann, K. Knebel, D. Kostin, S. Lederer, L. Lilje, S. Pfeiffer, R. Ritter, S. Schreiber, H. Weise, J. Ziegler
    DESY, Hamburg, Germany
  • G. Shu
    IHEP, Beijing, People’s Republic of China
  • M. Wenskat
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
  
  A new generation of normal conducting 1.3GHz RF gun was developed to provide a high-quality electron source for superconducting linac driven free-electron lasers like FLASH and European XFEL. Compared to the Gun4 series, Gun5 aims for a 50% increase of the duration of the RF pulse (up to 1 ms at 10 Hz repetition rate) combined with high gradients (up to ~60 MV/m at the cathode). In addition to the improved impedance, the new cavity is equipped with an RF probe to measure and control the amplitude and phase of the RF field inside the gun. The first prototype of the new RF gun was manufactured at DESY and installed at the Photo Injector Test facility at DESY in Zeuthen (PITZ) in October 2021. In mid-October 2021 the RF conditioning began, aiming for achieving the aforementioned RF parameters. The conditioning procedure involves a slow gradual increase in repetition rate, RF pulse duration and peak power while carefully monitoring vacuum conditions and signals from interlock sensors. The results of RF conditioning will be reported.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO03  
About • Received ※ 26 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 03 September 2022 — Issue date ※ 15 September 2022
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THPOJO10 RF Design and Characterisation of the CLARA 10 Hz Gun with Photocathode Load/Lock Upgrade cathode, gun, simulation, cavity 715
 
  • A.J. Gilfellon, L.S. Cowie, T.J. Jones, B.L. Militsyn, R. Valizadeh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The 2.5 cell S-band 10 Hz repetition rate electron gun (Gun-10) for the CLARA (Compact Linear Accelerator for Research and Applications) facility underwent an upgrade during the scheduled shutdown period during the summer of 2019. The existing photocathode/back plate was replaced by a new back plate with interchangeable photocathode socket connected to a load/lock system capable of rapid exchanges of photocathode plugs. Here we outline motivation and RF design of the back plate and also detail the low power RF testing and characterisation of the upgraded gun in terms of the unloaded quality factor, the RF power coupling match, the percent field flatness and the operating frequency of the cavity, calculated from the frequency measured in the laboratory. Finally, via simulations using CST MWS and ASTRA, we produce a dependence of expected beam momentum vs forward power that we predict the gun will deliver once it goes back online.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO10  
About • Received ※ 25 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 16 September 2022
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