Keyword: alignment
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MOPAB010 Anomaly Detection for Beam Loss Maps in the Large Hadron Collider collimation, flattop, proton, collider 92
 
  • G. Valentino
    University of Malta, Information and Communication Technology, Msida, Malta
  • R. Bruce, S. Redaelli, R. Rossi, P. Theodoropoulos
    CERN, Geneva, Switzerland
  • S. Jaster-Merz
    University of Hamburg, Hamburg, Germany
  
  In the LHC, beam loss maps are used to validate collimator settings for cleaning and machine protection. This is done by monitoring the loss distribution in the ring during infrequent controlled loss map campaigns, as well as in standard operation. Due to the complexity of the system, consisting of more than 50 collimators per beam, it is difficult to identify small changes in the collimation hierarchy, which may be due to setting errors or beam orbit drifts with such methods. A technique based on Principal Component Analysis and Local Outlier Factor is presented to detect anomalies in the loss maps and therefore provide an automatic check of the collimation hierarchy.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB010  
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MOPAB108 Beam-Based Alignment Studies at CTF3 Using the Octupole Component of CLIC Accelerating Structures octupole, wakefield, experiment, collider 371
 
  • J. Ögren, A.K. Bhattacharyya, M. Holz, R.J.M.Y. Ruber, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  • W. Farabolini
    CEA/DSM/IRFU, France
  
  The Compact Linear Collider (CLIC) uses normal-conducting accelerating structures that are sensitive to wakefield effects and therefore their alignment is extremely important. Due to the four-fold symmetry of the structures, they allow for an octupole component of the rf fields. By scanning the beam transversely we can determine the center of the structures from the shifts in beam position due to the kicks from the octupole field. We present some initial results from measurements at the CLIC test facility 3 at CERN.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB108  
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MOPIK062 Optics Adaptations for Bending Magnet Beam Lines at ESRF: Short Bend, 2-Pole Wiggler, 3-Pole Wiggler lattice, wiggler, radiation, dipole 666
 
  • S.M. Liuzzo, N. Carmignani, J. Chavanne, L. Farvacque, B. Nash, P. Raimondi
    ESRF, Grenoble, France
  
  The ESRF-EBS project foresees the replacement of the existing bending magnets beamlines with different radiation sources: short bend, 2-pole wiggler or 3-pole wiggler. After describing the reasons for this choices the required modifications to the storage ring lattice are described in details for each case. The study of the impact of lattice errors is also addressed, leading to the definition of beamlines' alignment tolerances.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK062  
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MOPIK088 Vertical Emittance Reduction in the SSRF Phase II Project emittance, coupling, quadrupole, sextupole 733
 
  • C.L. Li, B.C. Jiang, Z.B. Li, M.Z. Zhang, Q.L. Zhang, W.Z. Zhang
    SINAP, Shanghai, People's Republic of China
  
  The Shanghai Synchrotron Radiation Facility (SSRF) Phase II beamline project (SSRF Phase II) will implement the new lattice with dual-canted insertion devices, superbends and superconducting wiggler. The emittance coupling is one of the most important parameters for the high brightness storage ring light sources. It is often less than 1% in the third-generation storage ring light sources. In this paper, the sensitivity of emittance coupling to magnetic alignment errors in the SSRF Phase II is presented. Sixty skew quadrupole magnets are utilized to correct the emittance coupling with gradient descent algorithm. The emittance coupling obtained in the SSRF Phase II lattice is below 0.3%.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK088  
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MOPIK106 Effect of Magnetic Element Alignment Errors on Electron Beam Dynamics in the Transportation Channel of the NSC KIPT Neutron Source Driven With Linear Accelerator target, neutron, electron, dipole 781
 
  • A.Y. Zelinsky, P. Gladkikh, A.A. Kalamayko
    NSC/KIPT, Kharkov, Ukraine
  
  In the paper, the results of beam dynamics simulation in the transportation channel of the NSC KIPT neutron source taking into account the errors of the electromagnetic elements alignment are presented. It is show that the values of RMS alignment errors such as 100 mkm in transverse planes and 200 mkrad in angle installations lead to the essential shifts of the beam at a neutron target and, therefore, to the essential beam losses at the vacuum chamber walls. To avoid the losses one should provide additional electron beam correction and to increase the accuracy of the equipment alignment.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK106  
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MOPIK107 Injection Efficiency Simulation in the Electron Storage Ring of X-Ray Generator NESTOR storage-ring, injection, electron, simulation 784
 
  • A.Y. Zelinsky, P. Gladkikh, A.A. Kalamayko
    NSC/KIPT, Kharkov, Ukraine
  
  In the paper the results of the beam dynamics and injection efficiency simulation in the storage ring of the X-ray generator NESTOR are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK107  
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MOPVA042 CEA Preliminary Design of the Cryomodules for SARAF Phase II Superconducting Linac cavity, cryomodule, vacuum, simulation 951
 
  • R. Cubizolles, P. Brédy, D. Chirpaz-Cerbat, P. Hardy, F. Leseigneur, C. Madec, J. Plouin
    CEA/IRFU, Gif-sur-Yvette, France
  • N. Bazin
    CEA/DSM/IRFU, France
  • R. Bruce, Th. Plaisant
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  
  CEA is committed to deliver a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate 5mA beam of either protons from 1.3 MeV to 35 MeV or deuterons from 2.6 MeV to 40.1 MeV. The SCL consists of 4 cryomodules and 4 warm sections with diagnostics at the end of each cryomodule. The first two identical cryomodules host 6 half-wave resonator (HWR) low-beta cavities (β = 0.091), 176 MHz, and 6 focusing superconducting solenoids. The last two identical cryomodule welcome 7 HWR high-beta cavities (β = 0.181), 176 MHz, and 4 solenoids. The paper will presents the preliminary design of the cryomodules.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA042  
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TUPAB012 Comparison of Prismatic and Circular Biperiodical Accelerating Structures of 27 GHz Operating Frequency coupling, linac, simulation, impedance 1330
 
  • Yu.D. Kliuchevskaia, S.M. Polozov
    MEPhI, Moscow, Russia
  
  As known a biperiodical accelerating structure (BAS) represents as a system based on disk loaded waveguide (DLW) operating on Pi/2 mode and is widely used for the compact electron linacs. Earlier such structure with operating frequency of 27 GHz was proposed for medical application and beam dynamics simulations and electrodynamics modeling were done [1-2]. It was shown that such structure manufacturing should have very high accuracy and can be manufactured using electro erosive technology only. It is very complex for axi-symmetrical geometry to use such technology. Interesting option will to use a prismatic geometry BAS. In this report the design of a prismatic and disk-loaded BAS will discus, simulation results and analysis will presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB012  
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TUPAB016 The CLIC Main Linac Module Updated Design linac, klystron, operation, luminosity 1345
 
  • C. Rossi, M. Aicheler, N. Catalán Lasheras, R. Corsini, S. Döbert, A. Grudiev, A. Latina, H. Mainaud Durand, M. Modena, H. Schmickler, D. Schulte, S. Stapnes, I. Syratchev, A.L. Vamvakas, W. Wuensch
    CERN, Geneva, Switzerland
  • M. Aicheler
    HIP, University of Helsinki, Finland
  
  In 2016, CLIC implementation working groups have started their reflection on how to finalize the CLIC design work in the different areas of the project, aiming for a technical design and an overall implementation plan for CLIC being available for the next European Strategy Update around 2019. One of the working groups has focused its attention on the Main Linac hardware, which has brought together the different competences of the study with the aim of producing an advanced set of specifications for the design, installation and operation of the CLIC module. As the fundamental unit for the construction of the Main Beam linac, the CLIC module needs to move from the existing prototypes exploring its performance into an advanced and functional unit where the full life cycle of the module is considered. The progress of the working group activity is summarized in this paper, with considerations on the requirements for the design of the next-phase CLIC module.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB016  
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TUPAB030 Construction and Status of the Thrice Recirculating S-DALINAC recirculation, lattice, dipole, operation 1384
 
  • M. Arnold, R. Grewe, J. Pforr, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  • C. Eschelbach, M. Lösler
    Frankfurt University of Applied Sciences, Frankfurt am Main, Germany
  • F. Hug
    IKP, Mainz, Germany
  • T. Kürzeder
    HIM, Mainz, Germany
  
  Funding: Work supported by DFG through RTG 2128 and CRC 634.
From 1991 until 2015 the S-DALINAC (Superconducting-DArmstadt-LINear-ACcelerator) was operated as a twice recirculating electron accelerator. Its design energy of 130 MeV in cw-operation was not reached so far due to a lower quality factor of the SRF cavities and thus a higher dissipated power to the helium bath. In 2015/2016 a third recirculation has been built. Enabling a fourth passage through the main linac, the accelerating gradients can be reduced to fit the resulting dissipated power to the available cooling power for running at design energy. The upgrade to a thrice recirculating accelerator required the reconstruction of main parts of the existing lattice as well as an installation of a new beam line. All magnets had to be aligned carefully in position and orientation using high-precision metrology sensors. This contribution will present an overview of the construction and the alignment process. A latest status of the commissioning will be given. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB030  
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TUPAB088 Wire Position System to Consistently Measure and Record the Location Change of Girders Following Ground Changes electron, undulator, power-supply, electronics 1523
 
  • H. J. Choi, S.Y. Baek, H.-S. Kang, S.H. Kim, H.-G. Lee, S.B. Lee
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Several parts that comprise the large scientific device should be installed and operated at the accurate three-dimensional location coordinates where they should be subjected to survey and alignment. The location of the aligned parts should not be changed in order to ensure that the electron beam parameters of PAL-XFEL remain stable and can be operated without any problems. As time goes by, however, the ground goes through uplift and subsidence, which consequently deforms building floors. The deformation of the ground and buildings changes the location of several devices including magnets and RF accelerator tubes, which eventually leads to the alignment errors. Once alignment errors occur with regard to these parts, the electron beam deviates from its course and beam parameters change accordingly. PAL-XFEL has installed the Hydrostatic Leveling System to measure and record the vertical change of buildings and ground consistently and systematically and the Wire Position System to measure the two dimensional changes of girders. This paper is designed to introduce the operating principle and design concept of WPS and discuss the current situation regarding installation and operation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB088  
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TUPAB121 Bench Measurements and Beam Tests of a Prototype Stripline Kicker for Swap-Out Injection in the ALS-U kicker, impedance, vacuum, injection 1599
 
  • S. De Santis, J.M. Byrd, T.H. Luo, G.C. Pappas, C. Steier, C.A. Swenson, W.L. Waldron
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
The ALS upgrade to a diffraction-limited light source (ALS-U Project) relies on a swap-out injection scheme, where the circulating current is maintained constant by injecting on-axis fresh bunch trains, replacing old trains, which are simultaneously extracted. The realization of a stripline kicker to perform such an operation presents several challenges in terms of optimal matching to the pulser, contributions to the beam coupling impedance, and dissipation of the power deposited by the stored beam. To test our design choices for the ALS-U kicker, we have built and installed on the ALS a kicker with characteristics similar to the design for the ALS-U, as the more challenging aspects of the project are concerned. In particular, while the small distance between stripline electrodes reduces the required pulser voltage, the extreme proximity of the circulating beam requires a careful evaluation of the interaction between beam and kicker. In this paper we present the first measurements with beam, after the test kicker installation, together with the results of bench measurements performed on a cold model and computer simulations. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB121  
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TUPAB125 Magnetic Field Measurements at LBNL on Soft X-Ray and Hard X-Ray Undulator Segments for the Linear Coherent Light Source Upgrade (LCLS-II) Project undulator, photon, linac, software 1612
 
  • E.J. Wallén, D. Arbelaez, J.N. Corlett, L. Fajrado, H.W. Kim, M. Leitner, S. Marks, D. Schlueter, A. Zikmund
    LBNL, Berkeley, California, USA
  • Yu.I. Levashov, H.-D. Nuhn, Z.R. Wolf
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the Director, O'ce of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Stanford Linear Accelerator Laboratory is currently constructing the Linear Coherent Light Source II (LCLS-II), a FEL which will deliver x-rays at an energy range 0.2-5 keV at high repetition rate of up to 1 MHz using a new 4 GeV superconducting linac, and at an energy range 1-25 keV when using the existing copper linac at up to 120 Hz. To cover the full photon energy range, LCLS-II includes two variable-gap, hybrid-type permanent magnet undulator lines: A soft x-ray undulator (SXR) line with 21 undulator segments for the photon energy range 0.2-1.3 keV plus a hard x-ray undulator (HXR) line with 32 undulator segments designed for a photon energy range from 1-5 keV when using the superconducting linac. The HXR line is also designed to support 25 keV and higher photon energies when using the existing copper linac. Lawrence Berkeley National Laboratory (LBNL) is responsible for fabricating the undulators and tuning 23 of the HXR undulators. This paper summarizes the magnetic field measurements carried out on the pre-production undulators and describes the plans at LBNL for the magnetic measurements on the HXR undulators in series production. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB125  
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TUPAB140 Analysis and Correction of in-Vacuum Undulator Misalignment Effects in a Storage Ring Synchrotron Radiation Source undulator, electron, radiation, storage-ring 1663
 
  • O.V. Chubar, T.A. Caswell, Y. Chen-Wiegart, A. Fluerasu, Y. Hidaka, D.A. Hidas, C.A. Kitegi, M.S. Rakitin, T. Tanabe, J. Thieme, L. Wiegart, G. Williams
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work was partially supported by US DOE SBIR grants DE-SC0006284 and DE-SC0011237.
In-vacuum undulators (IVU) are currently very extensively used at different light source facilities, and in particular in medium-energy storage rings, for the production of high-brightness and high-flux hard X-rays. The relatively small (~5 mm or less) vertical magnetic gaps used in these planar undulators make them, however, rather sensitive to the accuracy of alignment of magnet arrays with respect to electron orbit in the vertical plane. Based on results of commissioning of a number of IVUs at hard X-ray beamlines of NSLS-II, their eventual misalignment with respect to the electron orbit was found to be among frequent reasons of spectral underperformance of the beamlines. We will present results of simulations of different IVU misalignment effects on magnetic fields seen by electron beam and on the emitted undulator radiation spectra. The simulations show e.g. that an impact of angular misalignment of an IVU on the radiation spectrum can be minimized if the IVU elevation is selected to make the electron orbit to pass through the IVU magnetic center. Experimental results of spectrum-based alignment of IVUs at hard X-ray beamlines will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB140  
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TUPAB145 Alignment of Electron and Ion Beam Trajectories in Non-Magnetized Electron Cooler solenoid, electron, ion, ISOL 1672
 
  • S. Seletskiy, M. Blaskiewicz, A.V. Fedotov, D. Kayran, J. Kewisch, R.J. Michnoff, I. Pinayev
    BNL, Upton, Long Island, New York, USA
  
  The cooling section (CS) of the low energy RHIC electron cooler (LEReC) consists of two 20 m long parts each containing six solenoids with trajectory correctors placed inside the solenoids and the BPMs located downstream of each solenoid. The solenoids are used to minimize the scalloping of the electron beam envelope. To obtain the cooling it is required to keep the overall RMS electron angles in the cooling section below 100 urad. Possible mechanical misalignment, such as shift and inclination of the CS solenoids can cause an unacceptable misalignment of the e-beam trajectory with respect to the ideal trajectory set by ions. Therefore, it is critical to perform a beam based alignment of the CS solenoids. In this paper we suggest a procedure for such an alignment.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB145  
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TUPAB147 The Final RF-Design of the 36 MHz-HSI-RFQ-Upgrade at GSI rfq, simulation, multipole, resonance 1678
 
  • M. Baschke, H. Podlech
    IAP, Frankfurt am Main, Germany
  • L. Groening, S. Mickat, C. Zhang
    GSI, Darmstadt, Germany
  
  In Darmstadt/Germany the existing accelerator cite GSI is expanding to one of the biggest joint research projects worldwide: FAIR, a new antiproton and ion research facility with so far unmatched intensities and quality. The existing accelerators will be used as pre-accelerators and therefor need to be upgraded to fulfill the requirements with respect for intensity and beam quality. In a first step the 9.2 m long 36 MHz-HSI-RFQ for high current beams will obtain new electrodes to reach the specific frequency and to allow a higher electric strength. Therefor several simulations with CST MWS have been done. The final RF-design will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB147  
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TUPIK014 Detailed Analysis of a Linear Beam Transport Line from a Laser Wakefield Accelerator to a Transverse-Gradient Undulator quadrupole, multipole, beam-transport, simulation 1711
 
  • A. Will, A. Bernhard, A.-S. Müller, C. Widmann
    KIT, Karlsruhe, Germany
  • M. Kaluza
    HIJ, Jena, Germany
  • M. Kaluza
    IOQ, Jena, Germany
  
  A linear beam transport system, experimentally tested at the Laser Wakefield Accelerator in Jena, Germany, has been carefully analyzed in order to gain a deeper understanding of the experimental results and to develop experimental strategies for the future. This analysis encompassed a detailed characterization of the focusing magnets and an investigation of the effects of source parameters as well as magnet and alignment errors on the observables accessible in the experiment. A dedicated tracking tool was developed for these investigations. In this contribution we review the main results of these studies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK014  
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TUPIK032 AWAKE Proton Beam Commissioning proton, plasma, laser, experiment 1747
 
  • J.S. Schmidt, D. Barrientos, M. Barros Marin, B. Biskup, A. Boccardi, T.B. Bogey, T. Bohl, C. Bracco, S. Cettour Cave, H. Damerau, V. Fedosseev, F. Friebel, S.J. Gessner, A. Goldblatt, E. Gschwendtner, L.K. Jensen, V. Kain, T. Lefèvre, S. Mazzoni, J.C. Molendijk, A. Pardons, C. Pasquino, S.F. Rey, H. Vincke, U. Wehrle
    CERN, Geneva, Switzerland
  • J.T. Moody
    MPI-P, München, Germany
  • K. Rieger
    MPI, Muenchen, Germany
  
  AWAKE will be the first proton driven plasma wakefield acceleration experiment worldwide. The facility is located in the former CNGS area at CERN and will include a proton, laser and electron beam line merging in a 10 m long plasma cell, which is followed by the experimental diagnostics. In the first phase of the AWAKE physics program, which started at the end of 2016, the effect of the plasma on a high energy proton beam will be studied. A proton bunch is expected to experience the so called self-modulation instability, which leads to the creation of micro-bunches within the long proton bunch. The plasma channel is created in a rubidium vapor via field ionization by a TW laser pulse. This laser beam has to overlap with the proton beam over the full length of the plasma cell, resulting in tight requirements for the stability of the proton beam at the plasma cell in the order of ~ 0.1 mm. In this paper the beam commissioning results of the ~810 m long transfer line for proton bunches with 3·1011 protons/bunch and a momentum of 400 GeV/c will be presented with a focus on the challenges of the parallel operation of the laser and proton beam.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK032  
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TUPIK042 Solenoid Alignment for the SRF Photoinjector of BERLinPro at HZB solenoid, SRF, software, electron 1778
 
  • G. Kourkafas, A. Jankowiak, T. Kamps, J. Li, J. Völker
    HZB, Berlin, Germany
  • M. Schebek
    Humboldt University Berlin, Berlin, Germany
  
  The Berlin Energy Recovery Linac Prototype (BERLinPro) at Helmholtz Zentrum Berlin (HZB) aims to deliver a continuous-wave (cw) electron beam of high average current (100 mA) and brilliance (normalized emittance below 1 mm mrad). The achievement of these demanding goals depends significantly on the performance of the electron source, a superconducting RF (SRF) photoinjector. A critical component for the quality of the generated beam is the superconducting solenoid magnet. In order to optimize its operation and minimize parasitic contributions, special attention has been given to the precise alignment of this element using a hexapod mover. Due to the strict limitations inside a cryostat, a complex coupling between the solenoid in vacuum and the hexapod in air has been realized, requiring sophisticated software and hardware mechanisms to prevent collisions. Along with this setup, the developed beam-based alignment procedure and its performance are demonstrated in this article.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK042  
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TUPIK064 Application of Smoothing Analysis in the Alignment and Installation Process of Particle Accelerator storage-ring, software, closed-orbit, Windows 1839
 
  • W. Wang, X.Y. He, L. Lin, F.F. Wu, Q. Zhang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  With the development of technology and theory of particle accelerator, the new particle accelerators will be built in the near future. Comparing with the running accelerators, higher efficiency and accuracy of installation and alignment are required. It is necessary for all the storage ring magnets to be placed with a high relative accuracy to meet the stringent demands of accelerator physics. Smoothing analysis is a practical method considering both relative accuracy and work efficiency. This article mainly introduces the principle and application of smoothing analysis.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK064  
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TUPIK065 A Software for Smoothing Magnet Track in Particle Accelerator* software, interface, storage-ring, network 1842
 
  • Q. Zhang, X.Y. He, G. Liu, W. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  This article describes a software for smoothing magnet track in particle accelerator. This paper introduces the development process of the software from the aspects of interface design, algorithm analysis, parameter meaning and so on. Magnet track smoothing means that under the conditions of meeting absolute accuracy, if the relative position error of the adjacent magnet is too large, it will cause the loss of beam, we call the track curve is not smooth enough. Smooth analysis can find these magnet components, the curve is smooth after a reasonable ad-justment. The software is based on the least square method. The software is tested by using the data of HLS storage ring, the results meet the needs of the work.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK065  
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TUPIK067 Online Monitoring of the ADS Test Cryostat Cold Mass With WPM cryomodule, vacuum, cryogenics, monitoring 1848
 
  • H.Y. Zhu
    Institute of High Energy Physics (IHEP), People's Republic of China
  • L. Dong, L.L. Men, Z. Wang
    IHEP, Beijing, People's Republic of China
  • B. Li
    CSNS, Guangdong Province, People's Republic of China
  
  Superconducting devices in particle accelerator demand strict operating environment: cryostat with ultra high vacuum and almost absolute zero temperature 2K-4K. This brings a big problem to survey and alignment work: how to preserve the magnets alignment precision in the cryostat, especially after such a big range temperature change. The complicate structure of magnet girder and cryogenic pipes make it difficult to do precise contraction simulation. So wire position monitor (WPM) is designed to measure the device contraction in cryomodule. Accelerator Driven System (ADS) Injector-I is a proton Linac, WPM system was assembled in its first cyomodule TCM. WPM is precisely calibrated, assembled at the same height as magnets. System noise, contraction stability and repeatability are analyzed in detail. Contraction coefficient of girder system is calculated by contraction data and temperature data, the result matches with the thermal coefficient of stainless steel very well. After commissioning, two thermal cycles were recorded, average contraction value was 1.35mm. The commissioning data shows about 0.2mm contraction difference with the same girder structure.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK067  
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TUPIK076 Pre-Alignment Techniques Developments and Measurement Results of the Electromagnetic Center of Warm High-Gradient Accelerating Structures simulation, linac, wakefield, target 1868
 
  • N. Galindo Munoz, N. Catalán Lasheras
    CERN, Geneva, Switzerland
  • V.E. Boria
    DCOM-iTEAM-UPV, Valencia, Spain
  • A. Faus-Golfe
    IFIC, Valencia, Spain
  
  Funding: PACMAN is founded under the European Union's 7th Framework Program Marie Curie Actions, grant PITN-GA-2013-606839
In the framework of the PACMAN project we have developed a test set-up to measure the electromagnetic centre of high gradient accelerating structures for alignment purposes. We have demonstrated with previous simulation studies that a resolution of 1 m is possible. The improvements applied on the technique and on the set-up, calibrations and the equipment instrumentation allows the measurement of the electromagnetic centre, with a final precision of 1.09 m in the horizontal plane and 0.58 m in the vertical plane. The experimental measurements and the simulation studies as a support to justify the numbers obtained are presented and discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK076  
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TUPIK077 Main Achievements of the PACMAN Project for the Alignment at Micrometric Scale of Accelerator Components quadrupole, target, collider, feedback 1872
 
  • H. Mainaud Durand, K. Artoos, M.C.L. Buzio, D. Caiazza, N. Catalán Lasheras, A. Cherif, I.P. Doytchinov, J.-F. Fuchs, A. Gaddi, N. Galindo Munoz, J. Gayde, S.W. Kamugasa, M. Modena, P. Novotny, S. Russenschuck, C. Sanz, G. Severino, D. Tshilumba, V. Vlachakis, M. Wendt, S. Zorzetti
    CERN, Geneva, Switzerland
  • A. Faus-Golfe
    LAL, Orsay, France
  
  Funding: The research leading to these results has received funding from the European Union's 7th Framework Programme Marie Curie actions, grant agreement PITN-GA-2013-606839.
The objectives of the PACMAN* project are to improve the precision and accuracy of the alignment of accelerator components. Two steps of alignment are concerned: the fiducialisation, i.e. the determination of the reference axis of components w.r.t alignment targets, and the initial alignment of components on a common support assembly. The main accelerator components considered for the study are quadrupoles, 15 GHz BPM and RF structures from the Compact LInear Collider (CLIC) project. Different methods have been developed to determine the reference axis of these components with a micrometric accuracy, as well as to determine the position of this reference axis in the coordinate frame of the common support assembly. The tools and methods developed have been validated with success on dedicated test setups using CLIC components. This paper will provide a compilation of the main achievements and results obtained.
* PACMAN is an acronym for a study on Particle Accelerator Components' Metrology and Alignment to the Nanometre scale. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK077  
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TUPIK085 HL-LHC Alignment Requirements and Associated Solutions quadrupole, target, vacuum, monitoring 1893
 
  • H. Mainaud Durand, S. Bartolome-Jimenez, T. Dijoud, A. Herty, M. Sosin
    CERN, Geneva, Switzerland
  • M. Duquenne, V. Rude
    ESGT-CNAM, Le Mans, France
  
  To increase by more than 10 times the luminosity reach w.r.t the first 10 years of the LHC lifetime, the HL-LHC project will replace nearly 1.2 km of the accelerator during the Long Shutdown 3 scheduled in 2024 [1][2][3]. This paper presents the HL-LHC alignment and internal metrology requirements of all the new components to be installed, from the magnet components to the beam instrumentation and vacuum devices. As for the LHC, a combination of Hydrostatic Levelling Sensors (HLS) and Wire Positioning Sensors (WPS) is proposed for the alignment of the main components, but on a longer distance (210 m instead of 50 m), generating technical challenges for the installation of the stretched wire and for the maintenance of the alignment systems. Innovative measurements methods and instrumentation are under study to perform the position monitoring inside a cryostat of cold masses and crab cavities, in a cold (2K) and radioactive (1 MGy/year) environment, as well as to carry remote measurements in the tunnel of the intermediary components. The proposed solutions concerning the determination of the position and the re-adjustment of the components are detailed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK085  
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TUPIK098 Micrometric Propagation of Error Using Overlapping Streched Wires for the CLIC Pre-Alignment simulation, network, linac, collider 1935
 
  • H. Mainaud Durand
    CERN, Geneva, Switzerland
  • J. Pfingstner
    University of Oslo, Oslo, Norway
  • V. Rude
    ESGT-CNAM, Le Mans, France
  
  The geodetic network for the Compact LInear collider (CLIC) will consist of a combination of overlapping wires stretched in parallel and Wire Positioning Sensors (WPS). Such a configuration will limit the propagation of errors (maximum deviation w.r.t. a fit line) below 10 micrometres over 200 metres. These first results were obtained through simulations in 2009, with hypotheses remaining to be validated. New experimental results have been obtained allowing to reconsider the precision and accuracy of WPS sensors and the knowledge of stretched wires. This paper presents the experimental results obtained on dedicated calibration benches and on a facility made of three overlapping stretched wires over a length of 140 metres including WPS sensors measurements. It confirms the possibility to have a propagation of error below 10 micrometres using overlapping stretched wires combined with WPS sensors.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK098  
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TUPIK099 Beam-Based Alignment for the Rebaselining of CLIC RTML emittance, sextupole, coupling, quadrupole 1939
 
  • Y. Han, L. Ma
    SDU, Shandong, People's Republic of China
  • A. Latina, D. Schulte
    CERN, Geneva, Switzerland
  
  The first stage of the CLIC is proposed to be at 380 GeV. So the Ring To Main Linac (RTML), which transport the beams from the damping ring to main linac with minimal emittance growth, should be restudied due to the new beam properties. In this paper the two bunch compressors in the RTML are redesigned. Then a complete study of the static beam-based alignment techniques along RTML is presented. The beam-based correction includes one-to-one and dispersion-free steering, then a global correction using tuning bumps is applied to reduce the final emittance and mitigate the effects of coupling. The results showed that the emittance growth budgets can be met both in the horizontal and vertical planes.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK099  
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TUPIK104 Effects of Non-axisymmetric Solenoid Field on Beam Quality in Velocity Bunching solenoid, linac, electron, emittance 1958
 
  • Y.H. Wen
    NTHU, Hsinchu, Taiwan
  • C.H. Chen, N.Y. Huang, W.K. Lau, A.P. Lee
    NSRRC, Hsinchu, Taiwan
  
  Space-charge effect is not negligible during the early stage of beam acceleration in a photoinjector rf linac that is operated for generation of short electron pulses by velocity bunching. A solenoid with iron shield can be used to provide the required axis-symmetric magnetic field to balance the radial space-charge force of the beam. However, the iron shield cannot be perfectly symmetric because openings are reserved for feeding water pipes and electrical cables to the coils. In addition, alignment errors of the solenoid may also spoil the symmetry of the focusing field. In this study, simulation is carried out to investigate how does the non-axisymmetric solenoid field of different origins influence beam properties, such as beam size, transverse emittance during the rf bunch compression.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK104  
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TUPIK108 Beam Based Alignment Studies for the CLARA FEL Test Facility FEL, quadrupole, undulator, cavity 1971
 
  • J.K. Jones, N. Thompson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  
  The CLARA (Compact Linear Accelerator for Research and Applications) test facility is designed to experimentally demonstrate innovative FEL schemes for future light source applications. Such schemes can place strict requirements on the accelerator beam properties as well as the relative alignment of the beam in the FEL radiators and modulators. Beam-based alignment (BBA) of the FEL section is therefore an operational requirement for all advanced FEL facilities. In this paper we demonstrate results of CLARA BBA simulations, and also report initial simulation results from the use of non-linear algorithms to optimise the FEL performance directly.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK108  
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TUPVA101 Study of Different Models on DTL for CSNS DTL, linac, emittance, simulation 2322
 
  • Y. Yuan, Z.P. Li, J. Peng
    IHEP, Beijing, People's Republic of China
  
  China Spallation Neutron Source (CSNS) is a high intensity accelerator based facility. Its accelerator consists of an H− injector and a proton Rapid Cycling Synchrotron (RCS). The injector includes the front end and linac. The RFQ accelerates the beam to 3MeV, and then the Drift Tube Linac (DTL) accelerates it to 80MeV. A Medium Energy Beam Transport (MEBT) matches RFQ and DTL, and the DTL consists of four tanks (DTL1, 2, 3, 4). A Linac to Ring Beam Transport (LRBT) matches DTL and RCS, also decreases beam energy spread. Commissioning of the first three DTL tank and LRBT straight section have been almost accomplished in this run. This paper takes a beam dynamics simulation on beam transport in MEBT and DTL at different DTL accelerate models. Meanwhile, beam's central orbit deviation at DTL and LRBT straight section due to DTL mechanical cavity's alignment errors is studied with IMPACT-Z code.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA101  
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TUPVA127 Optimisation of the Design of the Future Circular Collider from a Civil Engineering Perspective civil-engineering, collider, site, lattice 2392
 
  • J.L. Stanyard, V. Mertens, J.A. Osborne
    CERN, Geneva, Switzerland
  • Y. Loo, C. Sturzaker, M. Sykes
    ARUP, London, United Kingdom
  
  This paper describes the role of civil engineering in the optimisation of the design of CERN's Future Circular Collider (FCC). The civil engineering team at CERN have employed a bespoke, interactive, geological tool to consider the suitability of multiple layout options for the FCC, situated in the Geneva Basin, in particular quasi-circular options with circumferences in the order of 100 km. The tool has been used to provide feedback on potential lattice designs that are assessed based on criteria such as geological risk, shaft depth and the environmental sensitivities of access and experimental sites. This paper presents the process and some results of the impact of civil engineering on the design of the FCC, in particular on the layout, location, and structural requirements, and also how the optimised design has been used as the basis for a cost and schedule study.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA127  
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TUPVA130 CLIC Tuning Performance Under Realistic Error Conditions luminosity, collider, target, linear-collider 2403
 
  • E. Marín, A. Latina, F. Plassard, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  
  In this paper we present the latest results regarding the tuning study of the baseline design of the CLIC Final Focus System. In previous studies, 90% of the machines reach 90% of the nominal luminosity, when considering beam position monitor errors and transverse misalignments of magnets for a single beam case. In the present study, roll misalignments and strength errors are also included for both e- and e+ beamlines, making the study a more realistic one. First, second and third order knobs are implemented in the tuning procedure to target the most relevant beam size aberrations. In order to minimise the total number of luminosity measurements a simultaneous scan of various knobs has been developed to cope with the non-fully orthogonality of the knobs. The obtained results for single and double beam studies are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA130  
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TUPVA144 Beam Based Steering in LANSCE Proton Low Energy Beam Transport quadrupole, proton, emittance, beam-transport 2435
 
  • Y.K. Batygin
    LANL, Los Alamos, New Mexico, USA
  
  Beam based steering is an important procedure to minimize beam emittance growth. Low energy 750 keV LANSCE proton beam transport line before injection into Drift Tube Linac (DTL) has a length of 10 m and uses 22 quadrupoles, 6 steering magnets, 2 bending magnets, combination of prebuncher and main buncher, beam deflector, and collimators. Matching of the beam with the structure includes providing beam waists at the entrance of RF cavities, and matched beam Twiss parameters at the entrance to DTL. Typical beam emittance growth was at the level of 2-2.5. Beam based steering procedure was implemented to minimize emittance growth in the beamline. It includes determination of beam offset and beam angle entering group of quadrupoles and subsequent correction of beam angle to minimize beam offset in quadrupoles. Implementation of the procedure resulted in significant reduction of emittance growth at the level of 10%.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA144  
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WEPAB091 Progress on Transparent Realignment of the Diamond Storage Ring controls, storage-ring, monitoring, survey 2790
 
  • M. Apollonio, R. Bartolini, W.J. Hoffman, A.J. Rose, A. Thomson
    DLS, Oxfordshire, United Kingdom
  • R. Bartolini
    JAI, Oxford, United Kingdom
  
  The mechanical alignment of Diamond Storage Ring is achieved by means of a 5-axis motion system under remote control via the EPICS toolkit from the Diamond Control Room. We have completed the first phase of the realignment program meant to improve the mechanical alignment of the machine by carefully moving the magnet girders with a virtually zero impact on the associated beamlines, hence the name Transparent Realignment (TR). During this phase we have equipped and realigned 3 out of 24 cells, involving two beamlines. We have also tested and perfected the technique to execute a move with live beam and total remote control of the realignment process. The program has entered a second phase entailing the commissioning of 6 more cells. Details of tests on the machine are reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB091  
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WEPAB103 On-Axis Swap-Out Injection R+D for ALS-U kicker, injection, emittance, storage-ring 2821
 
  • C. Steier, A. Anders, S. De Santis, T.H. Luo, T. Oliver, G.C. Pappas, C. Sun, C.A. Swenson, W.L. Waldron
    LBNL, Berkeley, California, USA
  
  Funding: This work is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
The ALS-U upgrade promises to deliver diffraction limited performance throughout the soft x-ray range by lowering the horizontal emittance by a factor of 40 compared to the current ALS. One of the consequences of producing a small emittance is a small dynamic aperture, although the momentum acceptance will remain large enough for acceptable beam lifetime. To overcome this challenge, ALS-U will use on-axis swap-out injection to exchange bunch trains between the storage ring and an accumulator ring. On-axis swapout injection requires special fast pulsers and state-of-the-art stripline kicker magnets. This paper reports on the results of the on-axis swap-out injection R&D program, including beam tests of a complete stripline kicker/pulser system on the current ALS and the development of methods to speed up beam based commissioning after the upgrade shutdown. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB103  
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WEPVA055 Pre Orbit Correction Based on Tunnel Level Measurement in SuperKEKB optics, coupling, factory, emittance 3385
 
  • A. Morita, H. Koiso, Y. Ohnishi, H. Sugimoto
    KEK, Ibaraki, Japan
  
  The SuperKEKB accelerator tunnel has about 30mm displacement in the vertical direction. From the result of optics correction simulation with the tunnel displacement, it was decided that the beamline components align against the smoothed line of the measured tunnel level in order to save the alignment cost and time. In order to compensate the large tunnel displacement, the pre orbit correction based on the tunnel level measurement is applied at the beginning of the phase-1 commissioning, and the beam circulation is achieved with the small number of magnet adjustments. We report the result of the pre orbit correction.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA055  
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WEPVA070 Alignment and Calibration for Collimation System in CSNS/RCS collimation, vacuum, laser, shielding 3432
 
  • J.B. Yu, L. Dong, L. Kang, B. Li, X.J. Nie, A.X. Wang, G.Y. Wang, X.L. Wang, J.S. Zhang
    IHEP, Beijing, People's Republic of China
  • J.X. Chen, T. Luo, C.J. Ning
    CSNS, Guangdong Province, People's Republic of China
  
  Funding: National Natural Science Foundation of China (Grant Nos.11375217)
In order to reduce the uncontrolled losses in the localized station, the beam collimation system has been performed for the 1.6GeV synchrotron of CSNS. The CSNS/RCS transverse collimation system is designed to be a two-stage system which consists of one primary collimator and four secondary collimators. All collimators had completed processing and now been installed in the tunnel. To meet the requirements of physical system, alignment for collimation system have to be done before circulating beams. This paper will show the alignment technique of collimation system. Then some problems during the alignment process will be mentioned. For the primary collimator will be replaced in second-stage of CSNS, and the alignment for the replaced collimator will be introduced finally. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA070  
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WEPVA108 Operational Feedback and Analysis of Current and Future Designs of the Injection Protection Absorbers in the Large Hadron Collider at CERN injection, vacuum, impedance, operation 3517
 
  • D. Carbajo Perez, N. Biancacci, C. Bracco, G. Bregliozzi, M. Calviani, M.I. Frankl, L. Gentini, S.S. Gilardoni, G. Iadarola, I. Lamas Garcia, A. Lechner, A. Perillo-Marcone, B. Salvant
    CERN, Geneva, Switzerland
  
  Two injection protection absorbers, so-called TDIs (Target Dump Injection), are installed close to Interaction Points IP2 and IP8 of the Large Hadron Collider (LHC) right downstream of the injection kicker magnets (MKI). Malfunction or timing errors in the latter lead to wrong steering of the beam, which must then be intercepted by the TDI to avoid downstream equipment (which includes superconducting magnets) damage. In recent years, MKI failures during operation have brought to light opportunities for improvement of the TDI. The upgrade of this absorber, so-called TDIS (where S stands for segmented), is conceived as part of the High Luminosity-LHC (HL-LHC) project and those operational issues are taken into account for its design. The present document describes not only the aspects related to the current TDI performance and their impact in its successor's design but also the key modifications to cope with the stronger requirements associated to the higher luminosity goal.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA108  
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WEPVA128 The Data Acquisition System and Inspection Equipment on Vibration Evaluation for Deionized and Cooling Water Pumps in TPS coupling, status, operation, data-acquisition 3568
 
  • Y.-H. Liu, Y.-C. Chung, C.K. Kuan, Z.-D. Tsai
    NSRRC, Hsinchu, Taiwan
  
  The purpose of this paper is to evaluate the vibration amplitude and spectrum for TPS water pump systems. The utility systems operate continuously since 2014, some of deionized and cooling water pumps produced higher vibration amplitude and noise during operation. The possibly reason could be poor system accuracy, inappropriate installation and commission adjustment. The data acquisition system on vibration evaluation for deionizes water pumps was established in 2016. Accord-ing to the long-tern vibration amplitude recording, the system operational status could be clarified. After vibra-tion test for several months, the bearing of booster deion-ized water pump was found abrasive since coupling be-tween motor and pump misaligned. Besides, the founda-tion of copper deionized water pump system was broken and observed by rapidly increase vibration amplitude in short term. The water pump systems were repaired and maintained base on vibration evaluation. There is still some remain problems for deionized and cooling water pump systems. The utility systems could prevent mal-function through regular vibration inspection and daily data acquisition.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA128  
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THPAB039 Novel Manufacturing Concepts for 12 GHz High Gradient Accelerating Structures vacuum, operation, linac, damping 3787
 
  • A. Solodko, S. Atieh, N. Catalán Lasheras, A. Grudiev, S. Lebet, W. Wuensch
    CERN, Geneva, Switzerland
  • H. Zha
    TUB, Beijing, People's Republic of China
  
  CLIC high gradient accelerating structures (AS) work-ing in X-band are made of copper ultra-high precision discs, requiring both milling and turning operations. Discs are then joint together by diffusion bonding. The rest of important technical systems, such as vacuum, cooling and manifolds, to house damping silicon carbide absorbers, are brazed to the bonded disc stack afterwards. This manufacturing technique has been successfully demonstrated but it is very challenging and needs an accurate assembly at every production step. Main issues concern vacuum-tightness, misalignment, deformations during different assembly operations, defects of braz-ing/bonding operations (gaps, a leak of brazing material) etc. Preparation and repairs are time and resource con-suming and increase the final price of the accelerating structure. This paper describes the novel manufacturing concepts for 12 GHz high gradient AS and focuses on new joining techniques as electron beam welding or brazing, new engineering solutions, as rectangular cells or structures made of halves are being considered.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB039  
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THPAB110 Custom Optomechanics for the Optical Synchronization System at the European XFEL laser, timing, FEL, coupling 3976
 
  • F. Zummack, M. Felber, C. Gerth, T. Lamb, J.M. Müller, M. Schäfer, H. Schlarb, C. Sydlo
    DESY, Hamburg, Germany
  
  Free-electron-lasers like the upcoming European XFEL demand highly reliable optical synchronization in range of few femtoseconds. The well known optical synchronization system at FLASH had to be re-engineered to meet XFEL requirements comprising demands like ten times larger lengths and raised numbers of optically synchronized instruments. These requirements directly convert to optomechanical precision and have yielded in a specialized design accounting for economical manufacturing technologies. These efforts resulted in reduced spatial dimensions, improved optical repeatability, maintainability and even reduced production costs. To account for thermal influences the heart of the optical synchronization system is based on an optical table made out of SuperInvar. To fully exploit its excellent thermal expansion coefficient, mechanical details need to be taken into account. This work presents the design and its realization of the re-engineered optomechanical parts of the optical synchronization system, comprising mounting techniques, link stabilization units and optical delay lines for high drift suppression.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB110  
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THPAB145 CERN Accelerators Topology Configuration: Facing the Next Long Shutdown hardware, status, database, operation 4066
 
  • S. Bartolome-Jimenez, T.W. Birtwistle, S. Chemli, N. Gilbert, A.-L. Perrot, J. Piar, V. Simetka, B. Vazquez de Prada Planas
    CERN, Geneva, Switzerland
  
  The Configuration and Layout (CL) team at CERN ensures that there is a clear and coherent representation of the status of the CERN underground facilities (about 60 km of equipment) and main accelerator projects at a given point in time. In view of the major equipment changes to be carried out during the extended end of year technical stop (EYETS), the next Long Shutdown (LS2), and to facilitate the associated preparatory work of multiple CERN groups, the CL team has developed an immersive visualisation tool, displaying 360 degree panoramic images of CERN underground facilities. In addition, the CL team is launching a process to manage future layout configurations inside the CERN Layout database in parallel to the current configuration. This paper presents the 360 degree panorama visualisation tool and the parallel configuration process, to view the past, current and future status of the CERN accelerator complex. It highlights their added value for the CERN groups in the preparatory phase for upgrade and consolidation modifications and discusses the potential future improvements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB145  
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THPIK033 RF-Mechanical Design and Prototyping of the SPES RFQ rfq, interface, vacuum, simulation 4166
 
  • L. Ferrari, A. Palmieri, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  
  The SPES RFQ is designed in order to accelerate beams in CW with A/q ratios from 3 to 7 from the Charge Breeder through the MRMS and the selection and injection lines up to the MEBT. RFQ is composed of 6 modules about 1.2 m long each. Each module is basically composed of a Stainless Steel Tank and four OFE Copper Electrodes (obtained by brazing of two subassemblies in order to spare material). A copper layer is electrodeposited on the tank inner surface and a spring joint between tank and electrode is used in order to seal the RF. In this paper the main result of the design of the RFQ (with particular focus on the RF-mechanical aspects and thermo-structural calculations), the RFQ prototyping strategy as well as the construction and assembly procedure of RFQ modules are described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK033  
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THPIK079 Developments and Measurements Done at ALBA Magnetic Measurements Laboratory Along 2016 dipole, quadrupole, storage-ring, extraction 4266
 
  • J. Campmany, L.G.O. Garcia-Orta, J. Marcos, V. Massana
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  
  Along 2016, ALBA magnetic measurements laboratory has measured magnets for a number of facilities that are being built over the world. Their measurement has been a challenge in terms of improving the methodologies of fiducialization and data analysis, since we have to accommodate to the different set of magnets characteristics and specifications. Especially relevant has been the measurement of closed structures using a conventional Hall probe bench, making the measurement in two steps and relying on alignment accuracy to merge both measurements. In this paper we enumerate the different projects in which ALBA has collaborated, and we remark the method for aligning the quadrupoles to the rotating coil, as well the methodology used to measure closed magnets in two steps with the conventional Hall probe bench.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK079  
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THPIK094 Linac4 PIMS Construction and First Operation cavity, linac, vacuum, operation 4307
 
  • R. Wegner, G. Favre, P. Françon, J.-M. Geisser, F. Gerigk, J.-M. Giguet, J. Hansen, J.-B. Lallement, A.M. Lombardi, S. Papadopoulos, M. Polini, M. Redondas Monteserin, T. Tardy, N. Thaus, M. Vretenar
    CERN, Geneva, Switzerland
  • W. Behr, M. Pap
    Forschungszentrum Jülich GmbH, Central Institute of Engineering, Electronics and Analytics, Jülich, Germany
  • G. Brzezinski, P. Krawczyk, L. Kujawinski, M. Marczenko
    NCBJ, Świerk/Otwock, Poland
  
  Linac4, CERN's new H− injector Linac uses PI-Mode Structures (PIMS) for the energy range between 103 and 160 MeV. 180 copper elements for 12 PIMS cavities have been fabricated in a collaboration between CERN, NCBJ and FZJ from 2011 to 2016. The cavities have been assembled, RF tuned and validated at CERN. This paper reports on the results as well as the experience with construction, installation, RF conditioning and first operation with beam.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK094  
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THPIK107 Design and Characterisation of the Focusing Solenoidal System for the CLARA High Repetition Rate Electron Source solenoid, multipole, simulation, cathode 4346
 
  • D.J. Scott, A.R. Bainbridge, K.B. Marinov, B.L. Militsyn, B.J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • R.J. Cash, T.J. Jones
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • C.S. Edmonds
    The University of Liverpool, Liverpool, United Kingdom
  
  One of the critical components of electron injectors based on RF photoelectron sources is the focusing system. The system typically consists of a Main Focusing Solenoid and a Bucking Coil. Combination of these two solenoids should provide proper focusing of the beam at the exit of the RF cavity and zero longitudinal magnetic field in the photocathode plane to minimise the beam emittance. Imperfection of the solenoid design, manufacturing and alignment frequently leads to asymmetry of the focusing field which has to be compensated with additional coils. In order to eliminate mechanical and magnetic misalignment the CLARA photoinjector solenoids are mounted on one integrated bench and before installation into the beamline have been aligned in the magnet laboratory with simultaneous measurement of the magnetic field. In order to define multipole field components, dedicated measurements of the transverse magnetic field have been done. The amplitudes of the multipoles have been obtained from analysis of the transverse field map. We present here the results of field characterisation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK107  
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THPIK129 Non-Linear Inserts for the IOTA Ring vacuum, electron, operation, quadrupole 4407
 
  • F.H. O'Shea, R.B. Agustsson, P.S. Chang, Y.C. Chen
    RadiaBeam, Santa Monica, California, USA
  • D.W. Martin, J.D. McNevin
    RadiaBeam Systems, Santa Monica, California, USA
  
  Funding: Work supported by DOE under contract DE-SC0009531.
We present here the complete non-linear insert for the IOTA ring at Fermilab. In particular, we will show the results for the magnetic measurements and a discussion of leak correction in the unusually shaped vacuum chamber. A test assembly of the insert has been successfully completed and the insert functions mechanically as designed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK129  
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THPVA020 Distribution and Extreme Loss Analysis in the ESS Linac: A Statistical Perspective linac, proton, simulation, DTL 4458
 
  • A.L. Pedersen
    Lund Institute of Technology (LTH), Lund University, Lund, Sweden
  • D. Anevski
    Lund University, Lund, Sweden
  • M. Eshraqi, R. Miyamoto
    ESS, Lund, Sweden
  
  The report takes a statistical approach in the study of distribution evolution of the proton beam within the ESS linac and reports a new technique of pinpointing the non-linear space-charge effect of the propagating proton beam. By using the test statistic from the nonparametric Kolmogorov-Smirnov test the author visualises the change in the normalised distributions by looking at the supremum distance between the cumulative distribution functions in comparison, and the propagation of the deviation throughout the ESS linac. This approach identifies changes in the distribution which may cause losses in the linac and highlights the parts where the space-charge has big impact on the beam distribution. Also, an Extreme Value Theory approach is adopted in order to quantify the effects of the non linear forces affecting the proton beam distribution.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA020  
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THPVA048 Design and Progress on Mechanical & Alignment System for HEPS-TF controls, sextupole, quadrupole, emittance 4544
 
  • C. H. Li, S.J. Li, J. Liu, H. Wang, X.L. Wang, Z. Wang, L. Wu
    IHEP, Beijing, People's Republic of China
  
  HEPS is a new generation synchrotron facility with a stringent requirement of very low emmittance. The key technology difficulties are supposed be overcome during the HEPS-TF stage. There are two projects in progress for mechanical and alignment system. One is the development of precision auto-tuning magnet girder, to meet the requirement of beam based alignment in tunnel, the other is the study on vibrating-wire alignment technique to improve alignment accuracy of magnets on a girder. This paper will describe the design and progress of both projects.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA048  
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THPVA049 Introduction About Key Techniques of Critical Equipment in CSNS vacuum, dipole, operation, target 4548
 
  • L. Kang, H.Y. He, L. Liu, X.J. Nie, A.X. Wang, G.Y. Wang, J.B. Yu, J.S. Zhang, D.H. Zhu
    IHEP, Beijing, People's Republic of China
  • J.X. Chen, C.J. Ning, Y.J. Yu
    CSNS, Guangdong Province, People's Republic of China
  
  Funding: National Natural Science Foundation of China (Grant Nos.11375217)
The China Spallation Neutron Source (CSNS) is the complex consists of a negative hydrogen linear accelerator, a rapid cycling proton synchrotron (RCS) accelerating the beam to 1.6 GeV energy, a solid target station, and instruments for spallation neutron applications. Some equipment which work in high radiation zone, such as beam dumps, collimators, proton beam window and so on, should contain the performance of long lifetime, high vacuum, and remote maintenance easily. This paper mainly introduce some key techniques in these equipment, firstly quick-release remote clamp and remote maintenance tool in collimators and proton beam window will be introduced, then some key brazing techniques in processing of these equipment will also be mentioned. Vibration online monitoring system and other key techniques will be showed finally. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA049  
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THPVA050 Latest Progress of Magnet Girder Prototypes for HEPS-TF controls, photon, target, interface 4551
 
  • H. Wang, C. H. Li, S.J. Li, H. Qu, Z. Wang, L. Wu
    IHEP, Beijing, People's Republic of China
  
  The magnet girder technology is one of the key tech-nologies which should be overcome in the stage of HEPS-TF (Test Facility of High Energy Photon Source). The girder should be beam-based aligned, and must has high adjusting precision and high stability as well. For these issues, two girder systems are designed and developed. This paper will describe the latest progress of the girder prototypes, including structure design updates, control system progress, and processing and assembling of Girder I prototype.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA050  
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