Keyword: linac
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MOA3CO03 Bunch Shape Monitor Measurements at the LANSCE Linac ion, electron, target, detector 25
 
  • I.N.D. Draganic, D. Baros, C.M. Fortgang, R.W. Garnett, R.C. McCrady, J.F. O'Hara, L. Rybarcyk, C.E. Taylor, H.A. Watkins
    LANL, Los Alamos, New Mexico, USA
  • A. Feschenko, V. Gaidash, Yu.V. Kiselev
    RAS/INR, Moscow, Russia
  
  Two Bunch Shape Monitors (BSM) [1] have been developed, fabricated and assembled for the first direct longitudinal beam measurements at the Los Alamos Neutron Science Center (LANSCE) linear accelerator (linac). The BSM detectors use different radio frequencies for the deflecting field: first harmonic (201.25 MHz) and second harmonic (402.5 MHz) of fundamental accelerator radio frequency. The first BSM is designed to record the proton beam longitudinal phase distribution after the new RFQ accelerator at a beam energy of 750 keV with phase resolution of 1.0 degree and covering phase range of 180 degree at 201.25 MHz. The second BSM is installed between DTL tanks 3 and 4 of the LANSCE linac in order to scan both H+ and H− beams at a beam energy of 73 MeV with a phase resolution up to 0.5 degree in the phase range of 90 degree at 201.25 MHz. Preliminary results of bunch shape measurements for both beams under different beam gates (pulse length of 150 us, 1 Hz repetition rate, etc.) will be presented and compared high performance simulation results (HPSIM) [2].
[1] A. Feschenko, Proc. of RUPAC2012, FRXOR01, Saint Petersburg, Russia, pp. 181 - 185.
[2] X. Pang, L. Rybarcyk, and S. Baily, Proc. of HB2014, MOPAB30, East Lansing, MI, USA, pp. 99-102.
 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-MOA3CO03  
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MOA4CO04 Compact Carbon Ion Linac ion, DTL, rfq, accelerating-gradient 61
 
  • P.N. Ostroumov, A. Goel, B. Mustapha, A. Nassiri, A.S. Plastun
    ANL, Argonne, USA
  • L. Faillace, S.V. Kutsaev, E.A. Savin
    RadiaBeam, Marina del Rey, California, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under Accelerator Stewardship Grant, Proposal No. 0000219678.
Argonne National Laboratory is developing an Advanced Compact Carbon Ion Linac (ACCIL) in collaboration with RadiaBeam Technologies. The 45-meter long linac is designed to deliver up to 109 carbon ions per second with variable energy from 45 MeV/u to 450 MeV/u. To optimize the linac design in this energy range both backward traveling wave and coupled cell standing wave S-band structures were analyzed. To achieve the required accelerating gradients our design uses accelerating structures excited with short RF pulses (~500 ns flattop). The front-end accelerating structures such as the RFQ, DTL and Coupled Cell DTL are designed to operate at lower frequencies to maintain high shunt impedance. In parallel with our design effort ANL's RF test facility has been upgraded and used for the testing of an S-band high-gradient structure designed and built by Radiabeam for high pulsed RF power operation. The 5-cell S-band structure demonstrated 52 MV/m acceleration field at 2 μs 30 Hz RF pulses. A detailed physics design, including a comparison of different accelerating structures and end-to-end beam dynamics simulations of the ACCIL will be presented. 		 
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MOB4IO02 ERL-Ring and Ring-Ring Designs for the eRHIC Electron-Ion Collider ion, electron, luminosity, proton 64
 
  • V. Ptitsyn
    BNL, Upton, Long Island, New York, USA
  
  An overview of the eRHIC project.  
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MOB4CO04 Design of the Room-Temperature Front-End for a Multi-Ion Linac Injector ion, rfq, light-ion, heavy-ion 73
 
  • A.S. Plastun, Z.A. Conway, B. Mustapha, P.N. Ostroumov
    ANL, Argonne, Illinois, USA
  
  Funding: Work supported by the U.S.DOE, Office of Science, Office of Nuclear Physics, contract DE-AC02-06CH11357. This research used resources of ANL's ATLAS, which is a DOE Office of Science User Facility.
A pulsed multi ion injector linac is being developed by ANL for Jefferson Laboratory's Electron Ion Collider (JLEIC). The linac is designed to deliver both polarized and non polarized ion beams to the booster synchrotron at energies ranging from 135 MeV for hydrogen to 43 MeV/u for lead ions. The linac is composed of a 5 MeV/u room temperature section and a superconducting section with variable velocity profile for different ion species. This paper presents the results of the RF design of the main components and the beam dynamics simulations of the linac front-end with the goal of achieving design specifications cost-effectively. 		 
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MOPOB06 MAX IV and Solaris Linac Magnets Production Series Measurement Results ion, gun, storage-ring, septum 79
 
  • M.A.G. Johansson
    MAX IV Laboratory, Lund University, Lund, Sweden
  • R. Nietubyć
    NCBJ, Świerk/Otwock, Poland
  
  The linacs of the MAX IV and Solaris synchrotron radiation light sources, currently in operation in Lund, Sweden, and Kraków, Poland, use various conventional magnet designs. The production series of totally more than 100 magnets of more than 10 types or variants, which were all outsourced to industry, with combined orders for the types that are common to both MAX IV and Solaris, were completed in 2013 with mechanical and magnetic QA conforming to specifications. This article presents an overview of the different magnet types installed in these machines, and mechanical and magnetic measurement results of the full production series.  
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MOPOB39 A 600 Volt Multi-Stage, High Repetition Rate GaN FET Switch ion, electron, ECR, operation 152
 
  • G.W. Saewert, D. Frolov, H. Pfeffer
    Fermilab, Batavia, Illinois, USA
  
  Using recently available GaN FETs, a 600 Volt three-stage, multi-FET switch has been developed having 2 nanosecond rise time driving a 200 Ω load with the potential of approaching 30 MHz average switching rates. Possible applications include driving particle beam choppers kicking bunch-by-bunch and beam deflectors where the rise time needs to be custom tailored. This paper reports on the engineering issues addressed, the design approach taken and some performance results of this switch.  
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MOPOB55 Room Temperature Magnets in FRIB Driver Linac ion, quadrupole, alignment, dipole 188
 
  • Y. Yamazaki, N.K. Bultman, E.E. Burkhardt, F. Feyzi, K. Holland, A. Hussain, M. Ikegami, F. Marti, S.J. Miller, T. Russo, J. Wei, Q. Zhao
    FRIB, East Lansing, USA
  • W.J. Yang, Q.G. Yao
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Cooperative Agreement PHY-1102511.
The FRIB Driver Linac* is to accelerate all the stable ions beyond 200 MeV/nucleon with a beam power of 400 kW. The linac is unique, being compactly folded twice. In this report, the room temperature magnets, amounting 147 in total, after Front End with a 0.5-MeV RFQ, are detailed, emphasizing the rotating coil field measurements and fiducialization.
*E. Pozdeyev et al., "Status of FRIB" in this conference.
T. Xu, "Superconducting Cryomodule Development and Production for the FRIB Linac" in this conference. 		 
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MOPOB59 Magnet Design for the Splitter/Combiner Regions of CBETA, the Cornell-Brookhaven Energy-Recovery-Linac Test Accelerator ion, quadrupole, dipole, magnet-design 201
 
  • J.A. Crittenden, D.C. Burke, Y.L.P. Fuentes, C.E. Mayes, K.W. Smolenski
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Funding: Supported by NSF award DMR-0807731, DOE grant DE-AC02-76SF00515, and New York State.
The Cornell-Brookhaven Energy-Recovery-Linac Test Accelerator (CBETA) will provide a 150-MeV electron beam using four acceleration and four deceleration passes through the Cornell Main Linac Cryomodule housing six 1.3-GHz superconducting RF cavities. The return path of this 76-m-circumference accelerator will be provided by 106 fixed-field alternating-gradient (FFAG) cells which carry the four beams of 42, 78, 114 and 150-MeV. Here we describe magnet designs for the splitter and combiner regions which serve to match the on-axis linac beam to the off-axis beams in the FFAG cells, providing the path-length adjustment necessary to energy recovery for each of the four beams. The path lengths of the four beamlines in each of the splitter and combiner regions are designed to be adapted to 1-, 2-, 3-, and 4-pass staged operations. Design specifications and modeling for the 24 dipole and 32 quadrupole electromagnets in each region are presented. The CBETA project will serve as the first demonstration of multi-pass energy recovery using superconducting RF cavities with FFAG cell optics for the return loop. 		 
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MOPOB60 Performance of the Cornell Main Linac Prototype Cryomodule for the CBETA Project cavity, ion, HOM, cryomodule 204
 
  • F. Furuta, N. Banerjee, J. Dobbins, R.G. Eichhorn, M. Ge, D. Gonnella, G.H. Hoffstaetter, M. Liepe, T.I. O'Connell, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  The main linac prototype cryomodule (MLC) is a key component for the Cornell-BNL ERL Test Accelerator (CBETA), which is a 4-turn FFAG ERL under construction at Cornell University. The MLC has been designed for high current and efficient continuous wave (CW) SRF cavity operation, and houses six high Q0 7-cell SRF cavities with individual beamline higher order-modes (HOMs) absorbers for strong HOM suppression in high beam current operation. Cavities have achieved specification values of 16.2MV/m with high Q0 of 2.0·1010 at 1.8K in CW operation after cooldown optimizations and RF processing. Damping of the HOMs has been measured in detail, indicating that the loaded quality-factors of all critical modes are low enough to avoid BBU in high current, multi-turn ERL operation. Microphonics measurements have been carried out as well, and vibration sources have been determined and eliminated. Here we report on these cryomodule performance studies.  
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TUA1IO02 Status Report on the SPIRAL2 Facility at GANIL ion, rfq, proton, experiment 240
 
  • E. Petit
    GANIL, Caen, France
  
  The GANIL SPIRAL2 project is based on the construction of a superconducting ion CW LINAC with two experimental areas named S3 ('Super Separator Spectrometer') and NFS ('Neutron For Science'). This status will report the construction of the facility and the first beam commissioning results. The perspectives of the SPIRAL2 project, with the future construction of the low energy RIB experimental hall called DESIR and with the construction of a new injector with q/A>1/6 or 1/7, will also be presented.  
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TUA1CO05 Conceptual Design of a Ring for Pulse Structure Manipulation of Heavy Ion Beams at the MSU NSCL ion, rfq, extraction, acceleration 255
 
  • A.N. Pham, R. Ready, C.Y. Wong
    NSCL, East Lansing, Michigan, USA
  • S.M. Lund
    FRIB, East Lansing, USA
  • M.J. Syphers
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: Research supported by Michigan State University, MSU NSCL, ReA Project, and NSF Award PHY-1415462.
The Reaccelerator (ReA) Facility at the National Superconducting Cyclotron Laboratory (NSCL) located at Michigan State University (MSU) offers the low-energy nuclear science community unique capabilities to explore wider ranges of nuclear reactions and the structure of exotic nuclei. Future sensitive time-of-flight experiments on ReA will require the widening of pulse separation for improved temporal resolution in single bunch detection while minimizing loss of rare isotopes and cleaning of beam decay products that might pollute measurements. In this proceedings, we present a preliminary design of a heavy ion ring that will address the task of bunch compression, bunch separation enhancement, satellite bunches elimination, cleaning of decay products, beam loss mitigation, and improvement of beam transmission. 		 
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TUPOA12 An Updated LLRF Control System for the TLS Linac ion, controls, EPICS, LLRF 308
 
  • C.Y. Wu, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, D. Lee, C.Y. Liao
    NSRRC, Hsinchu, Taiwan
  
  The amplitude and phase of the RF field at the linear accelerator (LINAC) decides the beam quality. To study and to improve the performance of the LINAC system for Taiwan Light Source (TLS), a new design of a low-level radio-frequency (LLRF) control system was developed and set up for the TLS LINAC. The main components of the LLRF control system are an I/Q modulator, an Ethernet-based arbitrary waveform generator, a digital oscilloscope and an I/Q demodulator; these are essential parts of the LLRF feed-forward control. This paper presents the efforts to improve the LLRF control system. The feasibility of the RF feed-forward control will be studied at the linear accelerator of TLS.  
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TUPOA14 An Internet Rack Monitor-Controller for APS LINAC RF Electronics Upgrade ion, controls, network, klystron 314
 
  • H. Ma, A. Nassiri, T.L. Smith, Y. Sun
    ANL, Argonne, Illinois, USA
  • L.R. Doolittle, A. Ratti
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
To support the current research and development in APS LINAC area, the existing LINAC rf control performance needs to be much improved, and thus an upgrade of the legacy LINAC rf electronics becomes necessary. The proposed upgrade plan centers on the concept of using a modern, network-attached, rack-mount digital electronics platform 'Internet Rack Monitor-Controller (or IRMC) to replace the existing analog ones on the legacy crate/backplane-based hardware. The system model of the envisioned IRMC is basically a 3-tier stack with a high-performance processor in the mid- layer to handle the general digital signal processing (DSP). The custom FPGA IP's in the bottom layer handle the high-speed, real-time, low-latency DSP tasks, and provide the interface ports. A network communication gateway, in conjunction with an embedded event receiver (EVR), in the top layer merges the Internet Rack Monitor-Controller device into the networks of the accelerator controls infrastructure. Although the concept is very much in trend with today's Internet-of-Things (IoT), this implementation has actually been used in accelerators for over two decades. 		 
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TUPOA24 Beam Intensity Monitoring System for the PIP-II Injector Test Accelerator ion, pick-up, FPGA, interface 330
 
  • N. Liu, J.S. Diamond, N. Eddy, A. Ibrahim, N. Patel, A. Semenov
    Fermilab, Batavia, Illinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359.
The PIP-II injector test accelerator is an integrated systems test for the front-end of a proposed CW-compatible, pulsed H− superconducting RF linac. This linac is part of Fermilab's Proton Improvement Plan II (PIP-II) upgrade. This injector test accelerator will help minimize the technical risk elements for PIP-II and validate the concept of the front-end. Major goals of the injector accelerator are to test a CW RFQ and H− source, a bunch-by-bunch MEBT beam chopper and stable beam acceleration through low-energy superconducting cavities. Operation and characterization of this injector places stringent demands on the types and performance of the accelerator beam diagnostics. This paper discusses the beam intensity monitor systems as well as early commissioning measurements of beam transport through the Medium-Energy Beam Transport (MEBT) beamline. 		 
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TUPOA27 From Relativistic Electrons to X-ray Phase Contrast Imaging ion, electron, GUI, software 341
 
  • A.H. Lumpkin
    Fermilab, Batavia, Illinois, USA
  • M.A. Anastasio, A.B. Garson
    Washington University in St. Louis, St. Louis, Missouri, USA
  
  Funding: Work at Fermilab partly supported by Fermi Research Alliance, LLC under Contract No.DE-AC02-07CH11359 with the U.S.DoE. Work at Washington Univ. in St. Louis was supported in part by NSF CBET1263988.
X-ray phase contrast (XPC) imaging is an emerging technology that holds great promise for biomedical applications due to its ability to provide information about soft tissue structure *. The need for high spatial resolution at the boundaries of the tissues is noted for this process. Based on results from imaging of relativistic electron beams with single crystals **, we proposed transferring single-crystal imaging technology to this bio-imaging issue. Using a microfocus x-ray tube (17 kVp) and the exchangeable phosphor feature of the camera system, we compared the point spread function (PSF) of the system with the reference P43 phosphor to that with several rare earth garnet single crystals of varying thickness. Based on single Gaussian peak fits to the collimated x-ray images, we observed a four times smaller system PSF (21 microns (FWHM)) with the 25-mm diameter single crystals than with the reference polycrystalline phosphor's 80-micron value. Initial images of 33-micron diameter carbon fibers have also been obtained with small crystals installed. Tests with a full-scale 88-mm diameter single crystal (patent-pending configuration) are being planned.
*A. Appel, M.A. Anastasio, and E.M. Brey, Tissue Eng. Part B Rev 17 (5), 321 (2011).
**A.H. Lumpkin, et al., Phys. Rev. ST-AB 14 (6), 060704 (2011).
 		 
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TUPOA29 Beam Position Monitoring System for the PIP-II Injector Test Accelerator ion, pick-up, electronics, electron 349
 
  • N. Patel, C.I. Briegel, J.S. Diamond, N. Eddy, B.J. Fellenz, J. Fitzgerald, V.E. Scarpine
    Fermilab, Batavia, Illinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359.
The Proton Improvement Plan II (PIP-II) injector test accelerator is an integrated systems test for the front-end of a proposed continuous-wave (CW) compatible, pulsed H− superconducting RF linac. This linac is part of Fermilab's PIP-II upgrade. This injector test accelerator will help minimize the technical risk elements for PIP-II and validate the concept of the front-end. Major goals of the injector accelerator are to test a CW RFQ and H− source, a bunch-by-bunch Medium-Energy Beam Transport (MEBT) beam chopper and stable beam acceleration through low-energy superconducting cavities. Operation and characterization of this injector places stringent demands on the types and performance of the accelerator beam diagnostics. A beam position monitor (BPM) system has been developed for this application and early commissioning measurements have been taken of beam transport through the beamline. 		 
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TUPOA38 Real-Time Magnetic Electron Energy Spectrometer for Use With Medical Linear Acceletors ion, electron, detector, real-time 361
 
  • P.E. Maggi, H.R. Hogstrom, K.L. Matthews II
    LSU, Baton Rouge, USA
  • R.L. Carver
    Mary Bird Perkins Cancer Center, Our Lady of the Lake, Baton Rouge, USA
  
  Accelerator characterization and quality assurance is an integral part of electron linear accelerator (linac) use in a medical setting. The current clinical method for radia-tion metrology of electron beams (dose on central axis versus depth in water) only provides a surrogate for the underlying performance of the accelerator and does not provide direct information about the electron energy spectrum. We have developed an easy to use real-time magnetic electron energy spectrometer for characterizing the electron beams of medical linacs. Our spectrometer uses a 0.57 T permanent magnet block as the dispersive element and scintillating fibers coupled to a CCD camera as the position sensitive detector. The goal is to have a device capable of 0.12 MeV energy resolution (which corresponds to a range shift of 0.5 mm) with a minimum readout rate of 1 Hz, over an energy range of 5 to 25 MeV. This work describes the real-time spectrometer system, the detector response model, and the spectrum unfolding method. Measured energy spectra from multi-ple electron beams from an Elekta Infinity Linac are presented.  
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TUPOA54 Examination of Out-of-Field Dose and Penumbral Width of Flattening Filter Free Beams in Medical Linear Accelerators ion, photon, ECR, radiation 396
 
  • L.C. Bennett, O.N. Vassiliev
    M.D.A.C.C., Houston, Texas, USA
  
  Medical linear accelerators (LINACS) have traditionally used a flattening filter to ensure that the photon spectrum entering the patient was homogeneous within a given field size. Recently, leading manufacturers of medical accelerators have begun including an option for Flattening Filter Free (FFF) beams on their accelerators. These beams are characterized by a softer spectrum (lower average energy), peaked profiles, and less side scatter. Previous work with Monte Carlo models has shown that the elimination of the flattening filter from the beam path has the potential to greatly reduce scatter in regions immediately adjacent to the primary field (Kry 2010); however, systematic in-depth investigation of these effects has yet to be done using actual measurements from a linac equipped with FFF beams. We have examined and compared measurements of different energy pairings of FFF and FF beams from the Varian TrueBeam accelerators and found reductions of peripheral dose at upwards of 30% for the FFF beams and nearly 5% reduction in penumbral width at nearly all depths and field sizes; reductions were greatest for shallow depths and small field size.
Kry et al. Out-of-field photon dose following removal of the flattening filter from a medical accelerator. Physics in Medicine and Biology. vol. 55, no. 8, 2010. pp 2155-2166. 		 
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TUPOA68 Design, Simulations and Experimental Demonstration of an Intra-Pulse Ramped-Energy Travelling Wave Linac for Cargo Inspection ion, simulation, electron, beam-loading 421
 
  • S.V. Kutsaev, R.B. Agustsson, A. Arodzero, R.D.B. Berry, S. Boucher, Y.C. Chen, J.J. Hartzell, B.T. Jacobson, A. Laurich, A.Y. Murokh, E.A. Savin, A.Yu. Smirnov, A. Verma
    RadiaBeam, Santa Monica, California, USA
  
  Funding: This work has been supported by the US Department of Homeland Security, Domestic Nuclear Detection Office, under competitively awarded contract HSHQDC-13-C-B0019.
Novel radiographic imaging techniques [1] based on adaptive, intra-pulse ramped-energy short X-ray packets of pulses, a new type of fast X-ray detectors, and advanced image processing are currently some of the most promising methods for real-time cargo inspection systems. RadiaBeam Technologies is currently building the high-speed Adaptive Railroad Cargo Inspection System (ARCIS), which will enable better than 5 mm line pair resolution, penetration greater than 450 mm of steel equivalent, material discrimination over the range of 6 mm to 250 mm, 100% image sampling rate at speed 45 km/h, and minimal average dose. One of the core elements of ARCIS is a new S-band travelling wave linac with a wide range of energy control that allows energy ramping from 2 to 9 MeV within a single 16 μs RF pulse using the beam loading effect. In this paper, we will discuss the linac design approach and its principal components, as well as engineering and manufacturing aspects. The results of the experimental demonstration of intra-pulse energy ramping will be presented.
[1] A. Arodzero, S. Boucher, A. Murokh, S. Vinogradov, S.V. Kutsaev. System and Method for Adaptive X-ray Cargo Inspection. US Patent Application 2015/1472051. 		 
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TUB4IO01 Status of the Los Alamos Multi-Probe Facility for Matter-Radiation Interactions in Extremes ion, FEL, electron, experiment 464
 
  • J.L. Erickson, R.W. Garnett
    LANL, Los Alamos, New Mexico, USA
  
  The Matter-Radiation Interactions in Extremes (MaRIE) project will provide capability that will address the control of performance and production of materials at the mesoscale. MaRIE will characterize the behavior of interfaces, defects, and microstructure between the spatial scales of atomic structures and those of the engineering continuum where there is a current capability gap. The mission need is well-met with an x-ray source, coherent to optimize disordered imaging capability, brilliant and high-rep-rate to provide time-dependent information, and high enough energy to see into and through the mesoscale of materials of interest. It will be designed for time-dependence from electronic motion (picosecond) through sound waves (nanosecond) through thermal diffusion (millisecond) to manufacturing (seconds and above). The mission need, the requirements, a plausible alternative reference design of a 12-GeV linac-based 42-keV x-ray free-electron laser, and the status of the project will be described.  
slides icon Slides TUB4IO01 [16.013 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUB4IO01  
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TUB4IO02 Accelerator Technical Progress and First Commissioning Results from the European XFEL ion, FEL, MMI, electron 469
 
  • R. Wichmann
    DESY, Hamburg, Germany
  
  The construction of the European XFEL is coming to an end. The linac tunnel will be closed and commissioning of the main linac will start. The status of the construction project is reviewed. Commissioning of the injector of the European XFEL was already performed in 2016 while construction of the main linac was continuing. The commissioning goals and achievements for the XFEL injector will be reviewed.
Proposed Speaker: W. Decking, DESY 		 
slides icon Slides TUB4IO02 [13.428 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUB4IO02  
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TUPOB04 A More Compact Design for the JLEIC Ion Pre-Booster Ring ion, booster, injection, dipole 483
 
  • B. Mustapha, P.N. Ostroumov
    ANL, Argonne, USA
  • B. Erdelyi
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 for ANL
The original design of the JLEIC pre-booster was a 3-GeV figure-8 shaped synchrotron with a circumference of about 240 m. In the current baseline design, the 3-GeV pre-booster was converted into an 8-GeV booster of the same shape and size but using super-ferric magnets with fields up to 3 Tesla. In order to limit the foot-print of the JLEIC ion complex and reduce its total cost, we have designed a more compact and cost-effective octagonal 3-GeV ring about half the size of the original one. At 3 GeV, the figure-8 shape is not required to preserve ion polarization; Siberian snakes with reasonable magnetic fields can be used for spin correction. As the ion collider ring requires an injection energy of at least 8 GeV, we propose to use the existing electron storage ring, which is part of the electron complex, as a large booster for the ions up to 11 GeV. The design optimization of the pre-booster ring will be presented leading to the final octagonal ring design. Preliminary beam simulations will also be presented and discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOB04  
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TUPOB05 An Alternative Approach for the JLEIC Ion Accelerator Complex ion, booster, collider, proton 486
 
  • B. Mustapha, Z.A. Conway, P.N. Ostroumov, A.S. Plastun
    ANL, Argonne, USA
  • Y.S. Derbenev, F. Lin, V.S. Morozov, Y. Zhang
    JLab, Newport News, Virginia, USA
  
  Funding: This work was supported by the U.S. DOE, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 for ANL and by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
The current baseline design for the JLab EIC (JLEIC) ion accelerator complex is based on a pulsed superconducting linac, an 8-GeV booster followed by a dual function 20-100 GeV booster and collider ring. Both the 8-GeV booster and collider ring will use super-ferric magnets with fields up to 3 Tesla. We here propose an alternative cost-effective and low-risk design where the 8-GeV booster is replaced with a more compact 3-GeV booster using room-temperature magnets. The electron storage ring, which is part of the electron complex, will also serve as large booster for the ions, up to 11 GeV. We also propose two stages for the JLEIC. A first low-energy stage up to 60 GeV, where room-temperature magnets (up to 1.6 Tesla) will be used for the ion collider ring, to be later replaced with 6 Tesla superconducting magnets in a second stage of the project providing up to 200 GeV energy. In this second stage, the 1.6 T room-temperature magnets will replace the PEP-II magnets in the electron storage ring to boost the ions to higher energies (25 GeV or higher) for appropriate injection into the higher energy collider. Details and feasibility of the proposed plan will be presented and discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOB05  
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TUPOB40 Fundamental Properties of a Novel, Metal-Dielectric, Tubular Structure with Magnetic RF Compensation ion, impedance, coupling, simulation 582
 
  • A.V. Smirnov
    RadiaBeam Systems, Santa Monica, California, USA
  • E.A. Savin
    MEPhI, Moscow, Russia
  
  Funding: Supported by DoE Contract # DE-SC0011370
A number of electron beam vacuum devices such as small radiofrequency (RF) linear accelerators (linacs) and microwave traveling wave tubes (TWTs) utilize slow wave structures which are usually rather complicated in production and may require multi-step brazing and time consuming tuning. Fabrication of these devices becomes challenging at centimeter wavelengths, at large number of cells, and when a series or mass production of such structures is required. A hybrid, metal-dielectric, periodic structure for low gradient, low beam current applications is introduced here as a modification of Andreev's disk-and-washer (DaW) structure. Compensated type of coupling between even and odd TE01 modes in the novel structure results in negative group velocity with absolute values as high as 0.1c-0.2c demonstrated in simulations. Sensitivity to material imperfections and electrodynamic parameters of the disk-and-ring (DaR) structure are considered numerically using a single cell model. 		 
poster icon Poster TUPOB40 [1.447 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOB40  
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TUPOB41 Bi-Complex Toolbox Applied to Gyromagnetic Beam Break-Up ion, polarization, dipole, experiment 585
 
  • A.V. Smirnov
    RadiaBeam, Santa Monica, California, USA
  
  Transverse instability of a multi-bunch beam in the presence of a longitudinal magnetostatic field and hybrid dipole modes is considered analytically within a single-section model. It incorporates resonant interaction with beam harmonics and eigenmodes, degenerated waves of different polarizations, and the Lorentz RF force contribution. The analysis is performed in a very compact form using a bi-complex i,j-space including four-component collective frequency of the instability. Rotating polarization of the collective field is determined by ImiImj part of the bi-complex collective frequency in agreement with available data. The other three components represent detuning of the collective frequency ReiRej, the left-hand, and right-hand increments ImiRej±ReiImj of the gyro-magnetic BBU effect. The scalar hyper-complex toolbox can be applied to designing of non-ferrite non-reciprocal devices, spin transport, and for characterization of complex transverse dynamics in gyro-devices such as Gyro-TWTs.  
poster icon Poster TUPOB41 [0.526 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOB41  
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WEPOA07 Neutrons and Photons Fluences in the DTL Section of the ESS Linac ion, DTL, proton, neutron 703
 
  • L. Lari, R. Bevilacqua, R. Miyamoto, C. Pierre, L. Tchelidze
    ESS, Lund, Sweden
  • F. Cerutti, L.S. Esposito, L. Lari, A. Mereghetti
    CERN, Geneva, Switzerland
  • L.S. Esposito
    ADAM SA, Geneva, Switzerland
  
  The last section of the normal conducting front end of the ESS accelerator is composed by a train of 5 DTL tanks. They accelerate the proton beam from 3.6 until 90 MeV. The evaluation of the radiation field around these beam elements gives a valuable piece of information to define the layout of the electronic devices to be installed in the surrounding tunnel area. Indeed the risk of SEE and long term damage has to be considered in order to max-imize the performance of the ESS accelerator and to avoid possible long down time. A conservative loss distribution is assumed and FLUKA results in term of neutrons and photon fluence are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA07  
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WEPOA11 Frequency Manipulation of Half-Wave Resonators During Fabrication and Processing ion, cavity, cryomodule, target 710
 
  • Z.A. Conway, R.L. Fischer, C.S. Hopper, M. Kedzie, M.P. Kelly, S.H. Kim, P.N. Ostroumov, T. Reid
    ANL, Argonne, Illinois, USA
  • V.A. Lebedev, A. Lunin
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics and High-Energy Physics, under Contract No. DE-AC02-76-CH03000 and DE-AC02-06CH11357.
Argonne National Laboratory is developing a super-conducting resonator cryomodule for the acceleration of 2 mA H− beams from 2.1 to 10.3 MeV for Fermi National Accelerator Laboratory's Proton Improvement Plan II. The cryomodule contains 8 superconducting half-wave resonators operating at 162.500 MHz with a 120 kHz tuning window. This paper reviews the half-wave resonator fabrication techniques used to manipulate the resonant frequency to the design goal of 162.500 MHz at 2.0 K. This also determines the target frequency at select stages of resonator construction, which will be discussed and supported by measurements.
This research used resources of ANL's ATLAS facility, which is a DOE Office of Science User Facility. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA11  
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WEPOA12 Interleaving Lattice Design for APS Linac ion, lattice, electron, gun 713
 
  • S. Shin, Y. Sun, A. Zholents
    ANL, Argonne, Illinois, USA
  
  In order to realize and test advanced accelerator concepts and hardware, the existing beamline with both old and new components are being reconfigured in Linac Extension Area (LEA) of APS linac. Photo injector, which had been installed in the beginning of APS linac, will provide low emittance electron beam into the LEA. The thermionic RF gun beam for storage ring and photo-cathode RF gun beam for LEA will be operated though the LINAC in an interleaved fashion. In this presentation, technical issues as well as beam dynamics on the design for interleaving operation will be described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA12  
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WEPOA15 Installation Progress at the PIP-II Injector Test at Fermilab ion, rfq, controls, MMI 722
 
  • C.M. Baffes, M.L. Alvarez, R. Andrews, A.Z. Chen, J. Czajkowski, P. Derwent, J.P. Edelen, B.M. Hanna, B.D. Hartsell, K.R. Kendziora, D.V. Mitchell, L.R. Prost, V.E. Scarpine, A.V. Shemyakin, J. Steimel, T.J. Zuchnik
    Fermilab, Batavia, Illinois, USA
  • A.L. Edelen
    CSU, Fort Collins, Colorado, USA
  
  Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy
A CW-compatible, pulsed H− superconducting linac 'PIP-II' is being planned to upgrade Fermilab's injection complex. To validate the concept of the front-end of such a machine, a test accelerator (The PIP-II Injector Test, formerly known as "PXIE") is under construction. The warm part of this accelerator comprises a 10 mA DC 30 keV H− ion source, a 2m-long LEBT, a 2.1 MeV CW RFQ, and a 10-m long MEBT that is capable of creating a large variety of bunch structures. The paper will report on the installation of the RFQ and the first sections of the MEBT and related mechanical design considerations. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA15  
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WEPOA28 A Recirculating Proton Linac Design ion, cavity, proton, space-charge 752
 
  • K. Hwang, J. Qiang
    LBNL, Berkeley, California, USA
  
  The acceleration efficiency of the recirculating RF linac was demonstrated by operating electron machines. The acceleration concept of recirculating proton beam was recently proposed and is currently under study. In this paper, we present a 6D lattice design and beam dynamics tracking for a two-pass recirculating proton linac from 150 MeV to 500 MeV, which is the first section of the three acceleration steps proposed earlier. Issues covered are optimization of simultaneous focusing of two beams passing the same structure and achromatic condition under space-charge potential.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA28  
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WEPOA56 Design of RFQ Linac to Accelerate High Current Lithium Ion Beam from Laser Ion Source for Compact Neutron Source ion, neutron, rfq, ion-source 820
 
  • S. Ikeda, T. Kanesue, M. Okamura
    BNL, Upton, Long Island, New York, USA
  
  Accelerator-driven compact neutron sources have been developed to conduct nondestructive inspection more conveniently and/or on the spot with lower cost than other neutron sources, such as spallation sources and nuclear reactors. In typical compact source, proton or deuteron are injected into Li or Be. To develop a higher flax source than conventional ones, we propose a source with 7Li beam generated by laser ion source using direct injection scheme (DPIS) into RFQ linac. Because of the higher velocity of center of mass than that in the case of proton beam injection, generated neutrons are more collimated. In addition, laser ion source with DPIS is expected to accelerate mA class fully ionized 7Li beam stably with simple setup, while it is difficult for conventional ion sources. The high collimation and high current are expected to lead to higher neutron flax. In this presentation, we present a design of RFQ linac optimized to accelerate such a high current beam with shorter distance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA56  
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WEPOA60 Design Considerations for the Fermilab PIP-II 800 MeV Superconducting Linac ion, cavity, focusing, operation 826
 
  • A. Saini
    Fermilab, Batavia, Illinois, USA
  
  Proton Improvement Plan (PIP)-II is a proposed upgrade of existing proton accelerator complex at Fermilab. It is primarily based on construction of a superconducting (SC) linear accelerator (linac) that would be capable to operate in the continuous wave and pulsed modes. It will accelerate 2 mA H− ion beam up to 800 MeV. Among the various technical and beam optics issues associated with high beam power ion linacs, beam mismatch, uncontrolled beam losses, halo formation and potential element's failures are the most critical elements that largely affect performance and reliability of the linac. This paper reviews these issues in the framework of PIP-II SC linac and discusses experience accumulated in the course of this work.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA60  
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WEA3IO02 Start-to-End Beam Dynamics Optimization of X-Ray FEL Light Source Accelerators ion, controls, electron, FEL 838
 
  • J. Qiang
    LBNL, Berkeley, California, USA
  
  State-of-the-art tools have been developed that allow start-to-end modeling of the beam formation at the cathode, to its transport, acceleration, and delivery to the undulator. Algorithms are based on first principles, enabling the capture of detailed physics such as shot-noise driven micro-bunching instabilities. The most recent generation of the IMPACT code, using multi-level parallelization on massively parallel supercomputers, now enables multi-objective parametric optimization. This is facilitated by recent advances such as the unified differential evolution algorithm*. The most recent developments will be described, together with applications to the modeling of LCLS-II**.
*J. Qiang, et al, http://www.optimization-online.org/DBFILE/2015/03/4796.pdf, submitted
**J. Qiang, et al, in preparation
 		 
slides icon Slides WEA3IO02 [10.928 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEA3IO02  
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WEB3IO01 SRF Devlopment and Cryomodule Production for the FRIB Linac ion, cavity, cryomodule, SRF 847
 
  • T. Xu, H. Ao, B. Bird, N.K. Bultman, E.E. Burkhardt, F. Casagrande, C. Compton, J.L. Crisp, K.D. Davidson, K. Elliott, A. Facco, V. Ganni, A. Ganshyn, P.E. Gibson, W. Hartung, M. Ikegami, P. Knudsen, S.M. Lidia, I.M. Malloch, S.J. Miller, D.G. Morris, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, G. Shen, M. Shuptar, S. Stark, J. Wei, J.D. Wenstrom, M. Xu, T. Xu, Y. Xu, Y. Yamazaki, Z. Zheng
    FRIB, East Lansing, Michigan, USA
  • A. Facco
    INFN/LNL, Legnaro (PD), Italy
  • K. Hosoyama
    KEK, Ibaraki, Japan
  • M.P. Kelly
    ANL, Argonne, Illinois, USA
  • R.E. Laxdal
    TRIUMF, Vancouver, Canada
  • M. Wiseman
    JLab, Newport News, Virginia, USA
  
  Funding: Work supported by the U.S. Department of Energy Office of Sci-ence under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams' heavy ion con-tinuous-wave (CW) linac extends superconducting RF to low beam energy of 500 keV/u. 332 low-beta cavities are housed in 48 cryomodules. Technical development of high performance subsystems including resonator, cou-pler, tuner, mechanical damper, solenoid and magnetic shielding is necessary. In 2015, the first innovatively designed FRIB bottom-up prototype cryomodule was tested meeting all FRIB specifications. In 2016, the first full production cryomodule is constructed and tested. The preproduction and production cryomodule procurements and in-house assembly are progressing according to the project plan. 		 
slides icon Slides WEB3IO01 [15.765 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEB3IO01  
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WEB3CO03 650 MHz Elliptical Superconducting RF Cavities for PIP-II Project cavity, ion, SRF, simulation 859
 
  • V. Jain, E. Borissov, I.V. Gonin, C.J. Grimm, S. Kazakov, T.N. Khabiboulline, V.A. Lebedev, C.S. Mishra, D.V. Mitchell, T.H. Nicol, Y.M. Pischalnikov, A.M. Rowe, N.K. Sharma, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Proton Improvement Plan-II at Fermilab is an 800 MeV superconducting pulsed linac which is also capable of running in CW mode. The high energy section operates from 185 MeV to 800 MeV instigated using 650 MHz elliptical cavities. The low-beta (LB) βG =0.61 portion will accelerate protons from 185 MeV-500 MeV, while the high-beta (HB) βG = 0.92 portion of the linac will acceler-ate from 500 to 800 MeV. The development of both LB and HB cavities is taking place under the umbrella of the Indian Institutions Fermilab Collaboration (IIFC). This paper presents the design methodology adopted for both low-beta and high-beta cavities starting from the RF design yielding mechanical dimensions of the cavity cells and, then moving to the workable dressed cavity design. Designs of end groups (main coupler side and field probe side), helium vessel, coupler, and tuner are the same for both cavities everywhere where it is possible. The design, analysis and integration of dressed cavity are presented in detail. 		 
slides icon Slides WEB3CO03 [11.396 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEB3CO03  
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WEB4CO03 RF Calibration of CEBAF Linac Cavities Through Phase Shifts ion, cavity, optics, simulation 870
 
  • A. Carpenter, J. F. Benesch, C.J. Slominski
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
This paper describes a new beam-based method of cavity energy gain calibration based on varying the cavity phase. This method can be fully automated and allows a larger range of momentum excursions during measurement than previous calibration approaches. Monte Carlo simulations suggest that a calibration precision of 2-3% could be realistically achieved using this method. During the commissioning of the Continuous Electron Beam Accelerator Facility's (CEBAF) energy upgrade to 12 GeV, 876 measurements were performed on 375 of the 400 linac cavities in Fall 2015 and applied December 2015. Linac optics appears to be closer to design as a result. The resulting ensemble proved to be 2% over the value needed to get the desired energy in the arcs. Continued offline analysis of the data has allowed for error analysis and better understanding of the process. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEB4CO03  
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WEPOB11 Tuning of the APS Linac Accelerating Cavities After Structural Re-Alignment ion, cavity, cathode, photon 910
 
  • T.L. Smith, G.J. Waldschmidt
    ANL, Argonne, Illinois, USA
  
  A new S-band LCLS type Photo-cathode (PC) gun was recently installed in the APS linac. As a consequence, it was recognized that many of the linac accelerating structures were out of their 1mm straightness tolerances. In order to reduce the effects of wakefield on the beam, several of the misaligned structures were straightened. This paper discusses the bead-pull RF measurements, the effect of the straightening efforts on rf and the cell to cell retuning efforts that were performed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOB11  
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WEPOB27 Modification of 3rd Harmonic Cavity for CW Operation in LCLS-II Accelerator ion, HOM, cavity, FEL 960
 
  • T.N. Khabiboulline, M.H. Awida, I.V. Gonin, A. Lunin, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  A 3.9 GHz 3rd harmonic cavity was developed at FNAL and it is currently used in the FLASH accelerator at DESY in order to improve FEL operation. The European XFEL accelerator in Hamburg also adapted the same cavity design for a pulsed linac operation. The 3rd harmonic cavity for the LCLS-II accelerator at SLAC will operate in a continuous wave (CW) regime. A CW operation and a high average current in the LCLS-II linac result in in-creased heat loads to main and HOM couplers of the cavity. Several cavity design modifications were pro-posed and investigated for improving a cavity perfor-mance in the CW regime. In this paper we present results of the design review for proposed modifications  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOB27  
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WEPOB70 Mechanical Straightening of the 3-m Accelerating Structures at the Advanced Photon Source ion, photon, operation, alignment 1051
 
  • D.J. Bromberek, W.G. Jansma, T.L. Smith, G.J. Waldschmidt
    ANL, Argonne, Illinois, USA
  
  A project is underway at the Advanced Photon Source to mechanically straighten the thirteen 3 meter accelerating structures in the Linac in order to minimize transverse wakefield, and improve charge transport efficiency and beam quality. Flexure supports allow positioning of the structures in the X & Y directions. Mechanical design of the flexure support system, straightening techniques, mechanical measurement methods, and mechanical & RF results will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOB70  
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THPOA04 Maximum Brightness of Linac-Driven Electron Beams in the Presence of Collective Effects ion, brightness, electron, emittance 1101
 
  • S. Di Mitri
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  Linear accelerators capable of delivering high brightness electron beams are essential components of a number of research tools, such as free electron lasers (FELs) and elementary particle colliders. In these facilities the charge density is high enough to drive undesirable collective effects (wakefields) that may increase the beam emittance relative to the injection level, eventually degrading the nominal brightness. We formulate a limit on the final electron beam brightness, imposed by the interplay of geometric transverse wakefield in accelerating structures and coherent synchrotron radiation in energy dispersive regions*. Numerous experimental data of VUV and X-ray FEL drivers validate our model. This is then used to show that a normalized brightness of 1016 A/m2, promised so far by ultra-low charge beams (1-10 pC), can in fact be reached with a 100 pC charge beam in the Italian FERMI FEL linac, with the existing machine configuration.**
*Physical Review Special Topics - Accelerators And Beams 17, 110702 (2014)
**Physical Review Special Topics - Accelerators And Beams 16, 050701 (2013) 		 
poster icon Poster THPOA04 [0.828 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-THPOA04  
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THPOA05 Intrabeam Scattering in High Brightness Electron Linacs ion, electron, emittance, quadrupole 1104
 
  • S. Di Mitri
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  The role played by Intra-Beam Scattering (IBS) in high brightness electron linacs, like those driving free electron lasers, is studied analytically and with particle tracking. We found that IBS typically plays no significant role in the microbunching instability that develops in such accelerators*. A partial damping of the instability through IBS is envisaged, however, with dedicated magnetic insertions. The feasibility of linear and circular lattice designs to cumulate relevant IBS-induced energy spread, and the interplay with microbunching instability, are discussed theoretically, and with the help of tracking codes.
* S. Di Mitri, PRST-AB 17, 074401 (2014) 		 
poster icon Poster THPOA05 [0.547 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-THPOA05  
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THPOA29 PIP-II Transfer Lines Design ion, booster, dipole, optics 1161
 
  • A. Vivoli
    Fermilab, Batavia, Illinois, USA
  
  The U.S. Particle Physics Project Prioritization Panel (P5) report encouraged the realization of Fermilab's Proton Improvement Plan II (PIP-II) to support future neutrino programs in the United States. PIP-II aims at enhancing the capabilities of the Fermilab existing accelerator complex while simultaneously providing a flexible platform for its future upgrades. The central part of PIP-II project is the construction of a new 800 MeV H− Superconducting (SC) Linac together with upgrades of the Booster and Main Injector synchrotrons. New transfer lines will also be needed to deliver beam to the downstream accelerators and facilities. In this paper we present the recent development of the design of the transfer lines discussing the principles that guided their design, the constraints and requirements imposed by the existing accelerator complex and the following modifications implemented to comply with a better understanding of the limitations and further requirements that emerged during the development of the project.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-THPOA29  
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THA3IO01 FNAL Accelerator Complex Upgrade Possibilities ion, proton, booster, cavity 1248
 
  • I. Kourbanis
    Fermilab, Batavia, Illinois, USA
  
  Proton Improvement Plan-II (PIP-II) is the centerpiece of Fermilab's plan for upgrading the accelerator complex to establish the leading facility in the world for particle physics research based on intense proton beams. PIP-II has been developed to provide 1.2 MW of proton beam power at the start of operations of the Long Baseline Neutrino Experiment (LBNE), while simultaneously providing a platform for eventual extension of LBNE beam power to >2 MW and enabling future initiatives in rare processes research based on high duty factor/higher beam power operations. PIP-II is based on the construction of a new 800 MeV superconducting linac, augmented by improvements to the existing Booster, Recycler, and Main Injector complex. PIP-II is currently in the development stage with an R&D program underway targeting the front end and superconducting RF acceleration technologies. This paper will describe the status of the PIP-II conceptual development, the associated technology R&D programs, and the strategy for project implementation.  
slides icon Slides THA3IO01 [10.115 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-THA3IO01  
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THA3IO02 The ESS Accelerator: Moving into Construction ion, cavity, cryomodule, ion-source 1252
 
  • J.G. Weisend
    ESS, Lund, Sweden
  
  The ESS accelerator construction has started and the tunnel and RF gallery will be handed over to the accelerator division in 2016 with the installation of the cryoplant starting later in the year. Beam should be delivered in June 2019 at 570 MeV and 1.5 MW with full 5 MW capability being available in 2023. The project is a highly contributed project with more than 50% of the total budget being contributed IK by more than 25 IK partners. The talk will review the project status reflecting the IK nature of the project with the many partners contributions and with some focus on the cryogenics systems.  
slides icon Slides THA3IO02 [17.091 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-THA3IO02  
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THB3IO01 Development of a High Brightness Source for Fast Neutron Imaging* ion, neutron, target, optics 1260
 
  • B. Rusnak, S.G. Anderson, D.L. Bleuel, M.L. Crank, P. Fitsos, D.J. Gibson, M. Hall, M.S. Johnson, R.A. Marsh, J.D. Sain, R. Souza, A. Wiedrick
    LLNL, Livermore, California, USA
  
  Funding: *This work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
Lawrence Livermore National Lab is developing an intense, high-brightness fast neutron source to create high resolution neutron radiographs and images. An intense source (1011 n/s/sr at 0 degrees) of fast neutrons (10 MeV) allows: penetrating very thick, dense objects; maintaining high scintillator response efficiency; and remaining below the air activation threshold for (n,p) reactions. Fast neutrons will be produced using a pulsed 7 MeV, 300 microamp average-current commercial ion accelerator that will deliver deuterons to a 3 atmosphere deuterium gas cell. To achieve high resolution, a small (1.5 mm diameter) beam spot size will be used, and to reduce scattering from lower energy neutrons, a transmission gas cell will be used to produce a quasi-monoenergetic neutron beam. Because of the high power density of such a tightly focused, modest-energy ion beam, the gas target is a major engineering challenge that combines a 'windowless' rotating aperture, a rotary valve to meter cross-flowing high pressure gases, a novel gas beam stop, and recirculating gas compressor systems. A summary of the progress of the system design and building effort shall be presented. 		 
slides icon Slides THB3IO01 [6.998 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-THB3IO01  
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FRA1CO06 Measurement of Coherent Transition Radiation Using Interferometer and Photoconductive Antenna ion, electron, laser, polarization 1279
 
  • K. Kan, M. Gohdo, T. Kondoh, I. Nozawa, J. Yang, Y. Yoshida
    ISIR, Osaka, Japan
  
  Ultrashort electron beams are essential for light sources and time-resolved measurements. Electron beams can emit terahertz (THz) pulses using coherent transition radiation (CTR). Michelson interferometer* is one of candidates for analyzing the pulse width of an electron beam based on frequency-domain analysis. Recently, electron beam measurement using a photoconductive antenna (PCA)** based on time-domain analysis has been investigated. In this presentation, measurement of femtosecond electron beam with 35 MeV energy and < 1 nC from a photocathode based linac will be reported. Frequency- and time- domain analysis of THz pulse of CTR by combining the interferometer and PCA will be carried out.
* I. Nozawa, K. Kan et al., Phys. Rev. ST Accel. Beams 17, 072803 (2014).
** K. Kan et al., Appl. Phys. Lett. 102, 221118 (2013). 		 
slides icon Slides FRA1CO06 [2.334 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRA1CO06  
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FRB1IO02 LIGHT: A Linear Accelerator for Proton Therapy ion, proton, rfq, MMI 1282
 
  • D. Ungaro, A. Degiovanni, P. Stabile
    ADAM SA, Geneva, Switzerland
  
  ADAM, Application of Detectors and Accelerators to Medicine is a Swiss Company based in Geneva Switzerland established on 20th December 2007. ADAM was founded to promote scientific know-how and innovations in medical technology for cancer treatment. In 2007 a first partnership agreement was signed with CERN and in 2011 ADAM has been officially recognized as CERN spin-off. After the first research results other partnership agreements were signed between ADAM and CERN with the main goal of establishing a framework within which the two parties can collaborate to develop novel technologies for detectors and accelerators. Currently ADAM research activity is mainly focused on the construction and testing of its first linear accelerator for medical application: LIGHT (Linac for Image-Guided Hadron Therapy). LIGHT is an innovative linear accelerator designed to revolutionise hadron therapy facilities by simplifying the infrastructure and make them profitable from an industrial point of view while providing a better quality beam. The current design allow LIGHT to accelerate proton beam up to 230MeV with several advantages comparing to the current solutions present in the market.  
slides icon Slides FRB1IO02 [7.447 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRB1IO02  
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