HB2018 - Classification: Accelerator Systems

Paper	Title	Page
TUA1WC01	Installation and Commissioning of the Upgraded SARAF 4-rods RFQ	75
	L. Weissman, D. Berkovits, B. Kaizer, J. Luner, D. Nusbaum, A. Perry, J. Rodnizki, A. Shor, I. Silverman Soreq NRC, Yavne, Israel A. Bechtold NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany
	Acceleration of a 1mA Continuous Wave (CW) deuteron (A/Q=2) beam at SARAF has been accomplished for the first time. A 5.3 mA pulsed deuteron beam has been accelerated as well. These achievements cap a series of major modifications to the Radio Frequency Quadrupole (RFQ) 4-rods structure which included the incorporation of a new end flange, introduction of an additional RF power coupler and, most recently, installation of a new set of rod electrodes. The new rod modulation has been designed to enable deuteron beam acceleration at a lower inter-electrode voltage, to a slightly reduced final energy of 1.27 MeV/u and with stringent constraints on the extant of beam tails in the longitudinal phase space. This report will focus primarily on the installation and testing of the new rods. The successful conditioning campaign to 200 kW, ~10% above than the working point for deuteron operation, will be described. Beam commissioning with proton and deuteron beams will also be detailed. Results of beam measurements will be presented, including the characterization of the output beam in the transverse and longitudinal phase space. Finally, future possible improvements are discussed.
	Slides TUA1WC01 [12.606 MB]
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TUA1WC02	Recent Progress on the ESS Project
	M. Eshraqi ESS, Lund, Sweden
	The European Spallation Source, ESS, will be the world's brightest neutron source driven by the highest power linac, when it enters into operations. Different parts of the 5 MW ESS linac are being installed in Lund, Sweden and beam commissioning of the source is planned for early summer this year. This contribution will present a summary of the status of the project, including progress in the design, manufacturing and testing of different beam line components of the linac.
	Slides TUA1WC02 [3.422 MB]
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TUA1WC03	FRIB SRF Cryomodule Performance Testing and Status
	J.T. Popielarski, W. Chang, C. Compton, W. Hartung, S.H. Kim, S.J. Miller, L. Popielarski, K. Saito, S. Stark, T. Xu FRIB, East Lansing, Michigan, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 Construction of a new accelerator for nuclear physics research, the Facility for Rare Isotope Beams (FRIB), is underway at Michigan State University (MSU). The FRIB linac will use superconducting resonators operating at a temperature of 2 K to accelerate ions to 200 MeV per nucleon. The linac requires 10⁴ quarter wave resonators (0.085 MHz, β=0.041 and 0.085) and 220 half wave resonators (322 MHz, β= 0.29 and 0.53), all made from sheet Nb. Production resonators are being fabricated by cavity vendors; the resonators are etched, rinsed, and tested in MSU's certification test facility. Cavity certification testing is done before the installation of the high-power input coupler and tuner. After certification and cryomodule assembly, the resonators are tested in the cryomodule before installation into the FRIB tunnel. The cryomodule test goals are to verify integrated operation of the resonators, RF couplers, tuners, RF controls, and superconducting solenoids. To date, 22 out of 46 cryomodules have been completed, and 18 have been certified. Cavity and cryomodule certification test results are presented in this paper.
	Slides TUA1WC03 [2.744 MB]
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TUA1WC04	Applications of Neural Networks to the Modeling and Control of Particle Accelerators
	A.L. Edelen CSU, Fort Collins, Colorado, USA
	Particle accelerators are host to myriad control challenges: they involve a multitude of interacting systems, are often subject to tight performance demands, in many cases exhibit nonlinear behavior, sometimes are not well-characterized due to practical and/or fundamental limitations, and should be able to run for extended periods of time with minimal interruption. One avenue toward improving the way these systems are controlled is to incorporate techniques from machine learning. Within machine learning, neural networks in particular are appealing because they are highly flexible, they are well-suited to problems with nonlinear behavior and large parameter spaces, and their recent success in other fields is an encouraging indicator that they are now technologically mature enough to be fruitfully applied to particle accelerators. This talk will highlight how machine learning in general can be applied to particle accelerator modeling and control by discussing several examples that were focused specifically on neural network-based approaches for several particle accelerator systems and subsystems.
	Slides TUA1WC04 [57.957 MB]
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TUA2WC01	Discussion on SARAF-LINAC Cryomodules	80
	N. Pichoff CEA/IRFU, Gif-sur-Yvette, France D. Chirpaz-Cerbat, R. Cubizolles, J. Dumas, R.D. Duperrier, G. Ferrand, B. Gastineau, F. Leseigneur, C. Madec, Th. Plaisant, J. Plouin IRFU, CEA, University Paris-Saclay, Gif-sur-Yvette, France
	CEA is in charge of the design, construction, installation and commissioning at SNRC of the Linac of the SARAF project. The linac is composed of an MEBT and a Superconducting linac (SCL) integrating 4 cryomodules. Nowadays, the HWR cavities and superconducting magnets prototypes are being built. The Critical Design Review of the cryomodules has just been passed in March 2018. This paper present the status of the SARAF-LINAC cryomodules.
	Slides TUA2WC01 [14.245 MB]
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TUA2WC02	Status of R&D on New Superconducting Injector Linac for Nuclotron-NICA	83
	S.M. Polozov, M. Gusarova, T. Kulevoy, M.V. Lalayan, T.A. Lozeeva, S.V. Matsievskiy, R.E. Nemchenko, A.V. Samoshin, V.L. Shatokhin, N.P. Sobenin, D.V. Surkov, K.V. Taletskiy, V. Zvyagintsev MEPhI, Moscow, Russia A.A. Bakinowskaya, V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, D.A. Shparla, A. Shvedau, S.V. Yurevich, V.G. Zaleski Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus M.A. Baturitski, S.A. Maksimenko INP BSU, Minsk, Belarus A.V. Butenko, N. Emelianov, A.O. Sidorin, E. Syresin, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia S.E. Demyanov Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus, Minsk, Belarus V.A. Karpovich BSU, Minsk, Belarus T. Kulevoy ITEP, Moscow, Russia V.N. Rodionova Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus V. Zvyagintsev TRIUMF, Vancouver, Canada
	The progress in R&D of QWR and HWR superconducting cavities will be discussed. These cavities are designed for the new injection linac constructed for Nuclotron-NICA complex at JINR. The goal of new linac is to accelerate protons up to 25 MeV (and up to 50 MeV at the second stage) and light ions to ~7.5 MeV/u for Nuclotron-NICA injection. Current results of beam dynamics simulations, SC cavities design and SRF technology development will be presented in this report.
	Slides TUA2WC02 [3.782 MB]
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TUA2WC03	Studies on Superconducting Deuteron Driver Linac for BISOL	88
	F. Zhu, M. Chen, A.Q. Cheng, J.K. Hao, H.P. Li, S.W. Quan, F. Wang PKU, Beijing, People's Republic of China
	Funding: Work supported by National Basic Research Project (No. 2014CB845504) Beijing isotope separation on line type rare ion beam facility (BISOL) for both basic science and applications is a project proposed by China Institute of Atomic Energy and Peking University. Deuteron driver accelerator of BISOL would adopt superconducting half wave resonators (HWRs) with low beta and high current. The HWR cavity performance and the beam dynamic simulation of the superconducting deuteron driver accelerator will be presented in this paper.
	Slides TUA2WC03 [10.028 MB]
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TUA2WC04	High RF Power Conditioning of the RISP RFQ
	B.-S. Park, C.O. Choi, I.S. Hong, H. Jang, D.Y. Lee, K.T. Seol, K.T. Son IBS, Daejeon, Republic of Korea
	Funding: This work was supported by the Rare Isotope Science Project of Institute for Basic Science funded by the Ministry of Science, ICT(MSIT) and the National Research Foundation of Korea(2013M7A1A1075764). A CW radio frequency quadrupole (RFQ) accelerator has been designed, fabricated and installed to accelerate from proton to uranium for the Rare Isotope Science Project (RISP). The RISP RFQ is a four-vane type with a ramped inter-vane voltage profile to reduce the length and has 81.25 MHz operational frequency. The RFQ cavity consisted with nine modules, made by brazing eight segments composed with the oxygen free electric (OFE) copper, has a length of five meters and a diameter of one meter. High RF power system was composed with two 80 kW solid state power amplifier (SSPA). The high RF power can be feeding through two power coupler which can support more than 100 kW. The power from each SSPA is supplied to the cavity and the phase difference is compensated by controlling the cable length on the low power level. The designed power dissipation is 94 kW on the RFQ cavity. In this paper, the high RF power conditioning results will be reported from pulse mode to CW mode.
	Slides TUA2WC04 [9.144 MB]
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TUP2WE02	The Beam Conditions on the Target and its Operational Impacts on Beam Intercepting Devices at European Spallation Source	110
	Y. Lee, R. Miyamoto, T.J. Shea ESS, Lund, Sweden H.D. Thomsen ISA, Aarhus, Denmark
	A large flux of spallation neutrons will be produced at the European Spallation Source (ESS) by impinging high power proton beam on the tungsten target. Until the 5 MW proton beam is stopped by the spallation target, it travels through a number of beam intercepting devices (BIDs), which include the proton beam window, a multi-wire beam profile monitor, an aperture monitor, the beam entrance window, spallation material and the target shroud. The beam-induced thermo-mechanical loads and the damage dose rate in the BIDs are largely determined by the beam energy and the beam current density. At ESS, the proton beam energy will be commissioned step-wisely, from 570 MeV towards 2 GeV. The beam current density on the BIDs in the target station is equally painted by raster beam optics. The ESS Linac and its beam optics will create rectangular beam profiles on the target with varying beam intensities. In this paper, we study the impacts of different plausible beam intensities and beam energies on the thermo-mechanical loads and radiation damage rates in the BIDs at the ESS target station.
	Slides TUP2WE02 [9.826 MB]
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WEP2PO001	Upgraded Transverse Feedback for the CERN PS Booster	256
	A. Blas, G. Kotzian CERN, Geneva, Switzerland
	A new transverse feedback system is being used for the 4 rings of the CERN Proton Synchrotron Booster (PSB). In addition to transverse instabilities mitigation - within the range of 100 kHz to 100 MHz - the system allows for controlled beam emittance blow-up, machine tune measurement and other optic studies. The system was upgraded in order to multiply by 8 its power (800 W instead of 100 W on each of the 4 kicker electrodes) and in order for its electronic core to employ a digital processing. The transverse feedback adapts automatically to a factor 3 change in the beam revolution period and to any change of the machine tune. It includes an excitation source that combines up to 9 selectable harmonics of the revolution frequency with a selectable amplitude for each. The excitation may be dipolar or quadrupolar. Future possible upgrades will be presented including a setup to tackle half-integer tune values and a digital processing using a fixed clock frequency instead of the revolution frequency clock.
	Poster WEP2PO001 [1.794 MB]
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WEP2PO010	Fermilab - The Proton Improvement Plan (PIP)	287
	F.G. Garcia, S. Chaurize, C.C. Drennan, K. E. Gollwitzer, V.A. Lebedev, W. Pellico, J. Reid, C.-Y. Tan, R.M. Zwaska Fermilab, Batavia, Illinois, USA
	The Fermilab Proton Source is composed of three machines: an injector line, a normal conducting Linac and a Booster synchrotron. The proton improvement plan was proposed in 2012 to address the necessary accelerator upgrades and hardware modification to allow an increase in proton throughput, while maintaining acceptable activation levels, ensuring viable operation of the proton source to sustain the laboratory HEP program. A summary of work performed and respective results will be presented.
	Poster WEP2PO010 [1.699 MB]
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WEP2PO015	Progress and Plan of the Fast Protection System in the RAON Accelerator	296
	H. Jin, Y. Choi, S. Lee IBS, Daejeon, Republic of Korea
	In the RAON accelerator, beams generated by ion sources like ECR-IS or ISOL are accelerated to an energy of up to 200 MeV/u before reaching the laboratory target, and the beam power reaches up to about 400 kW at that moment. During transportation of such a beam, if beam loss occurs due to a device malfunction or a sudden change in beam condition, the accelerator can be severely damaged. Therefore, we have developed a machine protection system to protect the devices by minimizing the damage and to operate the accelerator in safe. As part of the RAON machine protection system, a FPGA-based fast protection system (FPS) that can protect devices within a few tens of microseconds after detecting the moment of beam loss has been developed since 2016. The development and test of the FPS prototype was successfully completed last year, and we are now preparing for mass production of the FPS. Here we will present the progress of the FPS development and the future plan for the FPS in the RAON accelerator.
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WEP2PO016	Temperature Measurement of Cryomodules	299
	H. Kim, J.W. Choi, Y.W. Jo, H.C. Jung, Y. Jung, J.W. Kim, M.S. Kim, Y. Kim, M. Lee IBS, Daejeon, Republic of Korea
	A quarter-wave resonator (QWR) and a half-wave resonator (HWR) cryomodules and the control systems such as programmable logic controller (PLC) are developed. Temperature sensors such as Cernox-1050 are calibrated and applied to the cryomodules. Preparation of vertical test is introduced. QWR and HWR cryomodules are fabricated and tested by using the developed PLC control system. The PLC rack and temperature monitors are shown and the human machine interfaces (HMI) screen is shown when the HWR cryomodules is tested at 2 K.
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THP1WC01	MEBT Laser Notcher (Chopper) for Booster Loss Reduction	416
	D.E. Johnson, C.M. Bhat, S. Chaurize, K.L. Duel, T.R. Johnson, P.R. Karns, W. Pellico, B.A. Schupbach, K. Seiya, D. Slimmer Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359 with the United States Department of Energy. The Fermilab Booster, which utilizes multi-turn injection and adiabatic capture, the extraction gap (aka "notch") has been created in the ring at injection energy using fast kickers which deposit the beam in a shielded absorber within the accelerator tunnel. This process, while effective at creating the extraction notch, was responsible for a significant fraction of the total beam power loss in the Booster tunnel and created significant residual activation within the Booster tunnel in the absorber region and beyond. With increasing beam demand from the Experimental Program, the Fermilab Proton Improvement Plan (PIP) initiated an R&D project to build a laser system to create the notch within a linac beam pulse at 750 keV, where activation in not an issue. This talk will discuss moving from R&D to an operational laser system and its integration into the accelerator complex. We will also cover the loss reduction in the Booster, increased efficiency, and increased proton throughput. We will touch on other potential applications for this bunch-by-bunch neutralization approach.
	Slides THP1WC01 [26.294 MB]
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THP1WC02	Status of Proof-of-Principle Demonstration of 400 MeV H-Stripping to Proton by Using Only Lasers at J-PARC	422
	P.K. Saha, H. Harada, M. Kinsho, A. Miura, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Irie, I. Yamane KEK, Ibaraki, Japan Y. Michine, H. Yoneda University of Electro-communications, Tokyo, Japan
	In order to make a breakthrough in the conventional H⁻ charge-exchange injection done by using solid stripper foil, we proposed a completely new method H⁻ stripping to proton by using only lasers. Extremely high residual radiation due foil beam interaction beam losses as well as unreliable and short lifetime of the stripper foil are already serious issues in all existing high intensity proton machines. To established our new principle, experimental studies for a proof-of-principle (POP) demonstration at 400 MeV H⁻ beam energy is under preparation at J-PARC. A vacuum chamber for the POP demonstration has already been installed at the end section of 400 MeV H⁻ beam transport of J-PARC Linac. The H⁻ beam manipulations, numerical simulations as well as the laser beam studies are in progress. The present status of the POP demonstration of 400 MeV H⁻ stripping to protons by using only lasers are presented.
	Slides THP1WC02 [7.535 MB]
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THP1WC03	Design of 162-MHz CW Bunch-by-Bunch Chopper and Prototype Testing Results	428
	A.V. Shemyakin, C.M. Baffes, J.-P. Carneiro, B.E. Chase, A.Z. Chen, J. Einstein-Curtis, D. Frolov, B.M. Hanna, V.A. Lebedev, L.R. Prost, G.W. Saewert, A. Saini, D. Sun Fermilab, Batavia, Illinois, USA C.J. Richard NSCL, East Lansing, Michigan, USA D. Sharma RRCAT, Indore (M.P.), India
	Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics The PIP-II program of upgrades proposed for the Fermilab accelerator complex, is centered around a 800 MeV, 2 mA CW SRF linac. A unique feature of the PIP-II linac is the capability to form a flexible bunch structure by removing a pre-programmed set of bunches from a long-pulse or CW 162.5 MHz train, coming from the RFQ, within the 2.1-MeV Medium Energy Beam Transport (MEBT) section. The MEBT chopping system consists of two travelling-wave kickers working in sync followed by a beam absorber. The prototype components of the chopping system, two design variants of the kickers and a 1/4-size absorber, have been installed in the PIP-II Injector Test (PIP2IT) accelerator and successfully tested with beam of up to 5 mA. In part, one of the kickers demonstrated a capability to create an aperiodic pulse sequence suitable for synchronous injection into the Booster while operating at 500 V and average switching frequency of 44 MHz during 0.55 ms bursts at 20 Hz. This report presents the design of the PIP-II MEBT chopping system and results of prototypes testing at PIP2IT.
	Slides THP1WC03 [4.615 MB]
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THP2WC01	The FNAL Booster Second Harmonic RF Cavity	434
	R.L. Madrak, J.E. Dey, K.L. Duel, M.R. Kufer, J. Kuharik, A.V. Makarov, R.D. Padilla, W. Pellico, J. Reid, G.V. Romanov, M. Slabaugh, D. Sun, C.-Y. Tan, I. Terechkine Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DEAC02- 07CH11359 with the United States Department of Energy. A second harmonic RF cavity which uses perpendicularly biased garnet for frequency tuning is currently being constructed for use in the Fermilab Booster. The cavity will operate at twice the fundamental RF frequency, from ~76 - 10⁶ MHz, and will be turned on only during injection, and transition or extraction. Its main purpose is to reduce beam loss as required by Fermilab's Proton Improvement Plan (PIP). After three years of optimization and study, the cavity design has been finalized and all constituent parts have been received. We discuss the design aspects of the cavity and its associated systems, component testing, and status of the cavity construction.
	Slides THP2WC01 [16.734 MB]
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THP2WC02	LLRF Studies for HL-LHC Crab Cavities	440
	P. Baudrenghien CERN, Geneva, Switzerland T. Mastoridis CalPoly, San Luis Obispo, California, USA
	The HL-LHC upgrade includes sixteen Crab Cavities (CC) to be installed on both sides of the high luminosity experiments, ATLAS and CMS. Two issues have been highlighted for the Low Level RF: transverse emittance growth (and associated luminosity drop) caused by CC RF noise, and large collimator losses following a CC trip. A prototype cryomodule with two CCs has been installed in the SPS, and tests have started in May 2018 with beam. This paper briefly reports on preliminary results from the SPS tests. It then presents emittance growth calculations from cavity field phase and amplitude noise, deduces the maximum RF noise compatible with the specifications and presents a possible cure consisting of a feedback on CC phase and amplitude. To reduce the losses following a CC trip we propose to implement transverse tail cleaning via the injection of CC noise with an optimized spectrum, which selectively excites the particles of large transverse oscillation amplitudes.
	Slides THP2WC02 [1.943 MB]
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THP2WC03	The Choosing of Magnetic Structure of Isochronous Cyclotron DC-130 for Applied Research	446
	I.A. Ivanenko, J. Franko, G.G. Gulbekyan, I.V. Kalagin, N.Yu. Kazarinov JINR, Dubna, Moscow Region, Russia
	At the present time, the activities on creation of the new multipurpose isochronous cyclotron DC130 are carried out at the FLNR, JINR. The cyclotron DC130 is intended for microchip testing, production of track pore membranes and for applied physics. The cyclotron will accelerate the heavy ions with mass-to-charge ratio A/Z from 5 to 8 up to the fixed energies 2 and 4.5 MeV per nucleon. The main magnet and acceleration system of DC130 is based on the U200 cyclotron that now is under reconstruction. At the present paper the method of choosing of main magnet parameters of cyclotron is described.
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Paper

Title

Page

Installation and Commissioning of the Upgraded SARAF 4-rods RFQ

75

L. Weissman, D. Berkovits, B. Kaizer, J. Luner, D. Nusbaum, A. Perry, J. Rodnizki, A. Shor, I. Silverman
Soreq NRC, Yavne, Israel
A. Bechtold
NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany

Acceleration of a 1mA Continuous Wave (CW) deuteron (A/Q=2) beam at SARAF has been accomplished for the first time. A 5.3 mA pulsed deuteron beam has been accelerated as well. These achievements cap a series of major modifications to the Radio Frequency Quadrupole (RFQ) 4-rods structure which included the incorporation of a new end flange, introduction of an additional RF power coupler and, most recently, installation of a new set of rod electrodes. The new rod modulation has been designed to enable deuteron beam acceleration at a lower inter-electrode voltage, to a slightly reduced final energy of 1.27 MeV/u and with stringent constraints on the extant of beam tails in the longitudinal phase space. This report will focus primarily on the installation and testing of the new rods. The successful conditioning campaign to 200 kW, ~10% above than the working point for deuteron operation, will be described. Beam commissioning with proton and deuteron beams will also be detailed. Results of beam measurements will be presented, including the characterization of the output beam in the transverse and longitudinal phase space. Finally, future possible improvements are discussed.

Slides TUA1WC01 [12.606 MB]

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TUA1WC02

Recent Progress on the ESS Project

M. Eshraqi
ESS, Lund, Sweden

The European Spallation Source, ESS, will be the world's brightest neutron source driven by the highest power linac, when it enters into operations. Different parts of the 5 MW ESS linac are being installed in Lund, Sweden and beam commissioning of the source is planned for early summer this year. This contribution will present a summary of the status of the project, including progress in the design, manufacturing and testing of different beam line components of the linac.

Slides TUA1WC02 [3.422 MB]

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TUA1WC03

FRIB SRF Cryomodule Performance Testing and Status

J.T. Popielarski, W. Chang, C. Compton, W. Hartung, S.H. Kim, S.J. Miller, L. Popielarski, K. Saito, S. Stark, T. Xu
FRIB, East Lansing, Michigan, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
Construction of a new accelerator for nuclear physics research, the Facility for Rare Isotope Beams (FRIB), is underway at Michigan State University (MSU). The FRIB linac will use superconducting resonators operating at a temperature of 2 K to accelerate ions to 200 MeV per nucleon. The linac requires 10⁴ quarter wave resonators (0.085 MHz, β=0.041 and 0.085) and 220 half wave resonators (322 MHz, β= 0.29 and 0.53), all made from sheet Nb. Production resonators are being fabricated by cavity vendors; the resonators are etched, rinsed, and tested in MSU's certification test facility. Cavity certification testing is done before the installation of the high-power input coupler and tuner. After certification and cryomodule assembly, the resonators are tested in the cryomodule before installation into the FRIB tunnel. The cryomodule test goals are to verify integrated operation of the resonators, RF couplers, tuners, RF controls, and superconducting solenoids. To date, 22 out of 46 cryomodules have been completed, and 18 have been certified. Cavity and cryomodule certification test results are presented in this paper.

Slides TUA1WC03 [2.744 MB]

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TUA1WC04

Applications of Neural Networks to the Modeling and Control of Particle Accelerators

A.L. Edelen
CSU, Fort Collins, Colorado, USA

Particle accelerators are host to myriad control challenges: they involve a multitude of interacting systems, are often subject to tight performance demands, in many cases exhibit nonlinear behavior, sometimes are not well-characterized due to practical and/or fundamental limitations, and should be able to run for extended periods of time with minimal interruption. One avenue toward improving the way these systems are controlled is to incorporate techniques from machine learning. Within machine learning, neural networks in particular are appealing because they are highly flexible, they are well-suited to problems with nonlinear behavior and large parameter spaces, and their recent success in other fields is an encouraging indicator that they are now technologically mature enough to be fruitfully applied to particle accelerators. This talk will highlight how machine learning in general can be applied to particle accelerator modeling and control by discussing several examples that were focused specifically on neural network-based approaches for several particle accelerator systems and subsystems.

Slides TUA1WC04 [57.957 MB]

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TUA2WC01

Discussion on SARAF-LINAC Cryomodules

80

N. Pichoff
CEA/IRFU, Gif-sur-Yvette, France
D. Chirpaz-Cerbat, R. Cubizolles, J. Dumas, R.D. Duperrier, G. Ferrand, B. Gastineau, F. Leseigneur, C. Madec, Th. Plaisant, J. Plouin
IRFU, CEA, University Paris-Saclay, Gif-sur-Yvette, France

CEA is in charge of the design, construction, installation and commissioning at SNRC of the Linac of the SARAF project. The linac is composed of an MEBT and a Superconducting linac (SCL) integrating 4 cryomodules. Nowadays, the HWR cavities and superconducting magnets prototypes are being built. The Critical Design Review of the cryomodules has just been passed in March 2018. This paper present the status of the SARAF-LINAC cryomodules.

Slides TUA2WC01 [14.245 MB]

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TUA2WC02

Status of R&D on New Superconducting Injector Linac for Nuclotron-NICA

83

S.M. Polozov, M. Gusarova, T. Kulevoy, M.V. Lalayan, T.A. Lozeeva, S.V. Matsievskiy, R.E. Nemchenko, A.V. Samoshin, V.L. Shatokhin, N.P. Sobenin, D.V. Surkov, K.V. Taletskiy, V. Zvyagintsev
MEPhI, Moscow, Russia
A.A. Bakinowskaya, V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, D.A. Shparla, A. Shvedau, S.V. Yurevich, V.G. Zaleski
Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
M.A. Baturitski, S.A. Maksimenko
INP BSU, Minsk, Belarus
A.V. Butenko, N. Emelianov, A.O. Sidorin, E. Syresin, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
S.E. Demyanov
Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus, Minsk, Belarus
V.A. Karpovich
BSU, Minsk, Belarus
T. Kulevoy
ITEP, Moscow, Russia
V.N. Rodionova
Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus
V. Zvyagintsev
TRIUMF, Vancouver, Canada

The progress in R&D of QWR and HWR superconducting cavities will be discussed. These cavities are designed for the new injection linac constructed for Nuclotron-NICA complex at JINR. The goal of new linac is to accelerate protons up to 25 MeV (and up to 50 MeV at the second stage) and light ions to ~7.5 MeV/u for Nuclotron-NICA injection. Current results of beam dynamics simulations, SC cavities design and SRF technology development will be presented in this report.

Slides TUA2WC02 [3.782 MB]

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TUA2WC03

Studies on Superconducting Deuteron Driver Linac for BISOL

88

F. Zhu, M. Chen, A.Q. Cheng, J.K. Hao, H.P. Li, S.W. Quan, F. Wang
PKU, Beijing, People's Republic of China

Funding: Work supported by National Basic Research Project (No. 2014CB845504)
Beijing isotope separation on line type rare ion beam facility (BISOL) for both basic science and applications is a project proposed by China Institute of Atomic Energy and Peking University. Deuteron driver accelerator of BISOL would adopt superconducting half wave resonators (HWRs) with low beta and high current. The HWR cavity performance and the beam dynamic simulation of the superconducting deuteron driver accelerator will be presented in this paper.

Slides TUA2WC03 [10.028 MB]

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TUA2WC04

High RF Power Conditioning of the RISP RFQ

B.-S. Park, C.O. Choi, I.S. Hong, H. Jang, D.Y. Lee, K.T. Seol, K.T. Son
IBS, Daejeon, Republic of Korea

Funding: This work was supported by the Rare Isotope Science Project of Institute for Basic Science funded by the Ministry of Science, ICT(MSIT) and the National Research Foundation of Korea(2013M7A1A1075764).
A CW radio frequency quadrupole (RFQ) accelerator has been designed, fabricated and installed to accelerate from proton to uranium for the Rare Isotope Science Project (RISP). The RISP RFQ is a four-vane type with a ramped inter-vane voltage profile to reduce the length and has 81.25 MHz operational frequency. The RFQ cavity consisted with nine modules, made by brazing eight segments composed with the oxygen free electric (OFE) copper, has a length of five meters and a diameter of one meter. High RF power system was composed with two 80 kW solid state power amplifier (SSPA). The high RF power can be feeding through two power coupler which can support more than 100 kW. The power from each SSPA is supplied to the cavity and the phase difference is compensated by controlling the cable length on the low power level. The designed power dissipation is 94 kW on the RFQ cavity. In this paper, the high RF power conditioning results will be reported from pulse mode to CW mode.

Slides TUA2WC04 [9.144 MB]

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TUP2WE02

The Beam Conditions on the Target and its Operational Impacts on Beam Intercepting Devices at European Spallation Source

110

Y. Lee, R. Miyamoto, T.J. Shea
ESS, Lund, Sweden
H.D. Thomsen
ISA, Aarhus, Denmark

A large flux of spallation neutrons will be produced at the European Spallation Source (ESS) by impinging high power proton beam on the tungsten target. Until the 5 MW proton beam is stopped by the spallation target, it travels through a number of beam intercepting devices (BIDs), which include the proton beam window, a multi-wire beam profile monitor, an aperture monitor, the beam entrance window, spallation material and the target shroud. The beam-induced thermo-mechanical loads and the damage dose rate in the BIDs are largely determined by the beam energy and the beam current density. At ESS, the proton beam energy will be commissioned step-wisely, from 570 MeV towards 2 GeV. The beam current density on the BIDs in the target station is equally painted by raster beam optics. The ESS Linac and its beam optics will create rectangular beam profiles on the target with varying beam intensities. In this paper, we study the impacts of different plausible beam intensities and beam energies on the thermo-mechanical loads and radiation damage rates in the BIDs at the ESS target station.

Slides TUP2WE02 [9.826 MB]

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WEP2PO001

Upgraded Transverse Feedback for the CERN PS Booster

256

A. Blas, G. Kotzian
CERN, Geneva, Switzerland

A new transverse feedback system is being used for the 4 rings of the CERN Proton Synchrotron Booster (PSB). In addition to transverse instabilities mitigation - within the range of 100 kHz to 100 MHz - the system allows for controlled beam emittance blow-up, machine tune measurement and other optic studies. The system was upgraded in order to multiply by 8 its power (800 W instead of 100 W on each of the 4 kicker electrodes) and in order for its electronic core to employ a digital processing. The transverse feedback adapts automatically to a factor 3 change in the beam revolution period and to any change of the machine tune. It includes an excitation source that combines up to 9 selectable harmonics of the revolution frequency with a selectable amplitude for each. The excitation may be dipolar or quadrupolar. Future possible upgrades will be presented including a setup to tackle half-integer tune values and a digital processing using a fixed clock frequency instead of the revolution frequency clock.

Poster WEP2PO001 [1.794 MB]

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WEP2PO010

Fermilab - The Proton Improvement Plan (PIP)

287

F.G. Garcia, S. Chaurize, C.C. Drennan, K. E. Gollwitzer, V.A. Lebedev, W. Pellico, J. Reid, C.-Y. Tan, R.M. Zwaska
Fermilab, Batavia, Illinois, USA

The Fermilab Proton Source is composed of three machines: an injector line, a normal conducting Linac and a Booster synchrotron. The proton improvement plan was proposed in 2012 to address the necessary accelerator upgrades and hardware modification to allow an increase in proton throughput, while maintaining acceptable activation levels, ensuring viable operation of the proton source to sustain the laboratory HEP program. A summary of work performed and respective results will be presented.

Poster WEP2PO010 [1.699 MB]

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WEP2PO015

Progress and Plan of the Fast Protection System in the RAON Accelerator

296

H. Jin, Y. Choi, S. Lee
IBS, Daejeon, Republic of Korea

In the RAON accelerator, beams generated by ion sources like ECR-IS or ISOL are accelerated to an energy of up to 200 MeV/u before reaching the laboratory target, and the beam power reaches up to about 400 kW at that moment. During transportation of such a beam, if beam loss occurs due to a device malfunction or a sudden change in beam condition, the accelerator can be severely damaged. Therefore, we have developed a machine protection system to protect the devices by minimizing the damage and to operate the accelerator in safe. As part of the RAON machine protection system, a FPGA-based fast protection system (FPS) that can protect devices within a few tens of microseconds after detecting the moment of beam loss has been developed since 2016. The development and test of the FPS prototype was successfully completed last year, and we are now preparing for mass production of the FPS. Here we will present the progress of the FPS development and the future plan for the FPS in the RAON accelerator.

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WEP2PO016

Temperature Measurement of Cryomodules

299

H. Kim, J.W. Choi, Y.W. Jo, H.C. Jung, Y. Jung, J.W. Kim, M.S. Kim, Y. Kim, M. Lee
IBS, Daejeon, Republic of Korea

A quarter-wave resonator (QWR) and a half-wave resonator (HWR) cryomodules and the control systems such as programmable logic controller (PLC) are developed. Temperature sensors such as Cernox-1050 are calibrated and applied to the cryomodules. Preparation of vertical test is introduced. QWR and HWR cryomodules are fabricated and tested by using the developed PLC control system. The PLC rack and temperature monitors are shown and the human machine interfaces (HMI) screen is shown when the HWR cryomodules is tested at 2 K.

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THP1WC01

MEBT Laser Notcher (Chopper) for Booster Loss Reduction

416

D.E. Johnson, C.M. Bhat, S. Chaurize, K.L. Duel, T.R. Johnson, P.R. Karns, W. Pellico, B.A. Schupbach, K. Seiya, D. Slimmer
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The Fermilab Booster, which utilizes multi-turn injection and adiabatic capture, the extraction gap (aka "notch") has been created in the ring at injection energy using fast kickers which deposit the beam in a shielded absorber within the accelerator tunnel. This process, while effective at creating the extraction notch, was responsible for a significant fraction of the total beam power loss in the Booster tunnel and created significant residual activation within the Booster tunnel in the absorber region and beyond. With increasing beam demand from the Experimental Program, the Fermilab Proton Improvement Plan (PIP) initiated an R&D project to build a laser system to create the notch within a linac beam pulse at 750 keV, where activation in not an issue. This talk will discuss moving from R&D to an operational laser system and its integration into the accelerator complex. We will also cover the loss reduction in the Booster, increased efficiency, and increased proton throughput. We will touch on other potential applications for this bunch-by-bunch neutralization approach.

Slides THP1WC01 [26.294 MB]

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THP1WC02

Status of Proof-of-Principle Demonstration of 400 MeV H-Stripping to Proton by Using Only Lasers at J-PARC

422

P.K. Saha, H. Harada, M. Kinsho, A. Miura, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Irie, I. Yamane
KEK, Ibaraki, Japan
Y. Michine, H. Yoneda
University of Electro-communications, Tokyo, Japan

In order to make a breakthrough in the conventional H⁻ charge-exchange injection done by using solid stripper foil, we proposed a completely new method H⁻ stripping to proton by using only lasers. Extremely high residual radiation due foil beam interaction beam losses as well as unreliable and short lifetime of the stripper foil are already serious issues in all existing high intensity proton machines. To established our new principle, experimental studies for a proof-of-principle (POP) demonstration at 400 MeV H⁻ beam energy is under preparation at J-PARC. A vacuum chamber for the POP demonstration has already been installed at the end section of 400 MeV H⁻ beam transport of J-PARC Linac. The H⁻ beam manipulations, numerical simulations as well as the laser beam studies are in progress. The present status of the POP demonstration of 400 MeV H⁻ stripping to protons by using only lasers are presented.

Slides THP1WC02 [7.535 MB]

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THP1WC03

Design of 162-MHz CW Bunch-by-Bunch Chopper and Prototype Testing Results

428

A.V. Shemyakin, C.M. Baffes, J.-P. Carneiro, B.E. Chase, A.Z. Chen, J. Einstein-Curtis, D. Frolov, B.M. Hanna, V.A. Lebedev, L.R. Prost, G.W. Saewert, A. Saini, D. Sun
Fermilab, Batavia, Illinois, USA
C.J. Richard
NSCL, East Lansing, Michigan, USA
D. Sharma
RRCAT, Indore (M.P.), India

Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics
The PIP-II program of upgrades proposed for the Fermilab accelerator complex, is centered around a 800 MeV, 2 mA CW SRF linac. A unique feature of the PIP-II linac is the capability to form a flexible bunch structure by removing a pre-programmed set of bunches from a long-pulse or CW 162.5 MHz train, coming from the RFQ, within the 2.1-MeV Medium Energy Beam Transport (MEBT) section. The MEBT chopping system consists of two travelling-wave kickers working in sync followed by a beam absorber. The prototype components of the chopping system, two design variants of the kickers and a 1/4-size absorber, have been installed in the PIP-II Injector Test (PIP2IT) accelerator and successfully tested with beam of up to 5 mA. In part, one of the kickers demonstrated a capability to create an aperiodic pulse sequence suitable for synchronous injection into the Booster while operating at 500 V and average switching frequency of 44 MHz during 0.55 ms bursts at 20 Hz. This report presents the design of the PIP-II MEBT chopping system and results of prototypes testing at PIP2IT.

Slides THP1WC03 [4.615 MB]

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THP2WC01

The FNAL Booster Second Harmonic RF Cavity

434

R.L. Madrak, J.E. Dey, K.L. Duel, M.R. Kufer, J. Kuharik, A.V. Makarov, R.D. Padilla, W. Pellico, J. Reid, G.V. Romanov, M. Slabaugh, D. Sun, C.-Y. Tan, I. Terechkine
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DEAC02- 07CH11359 with the United States Department of Energy.
A second harmonic RF cavity which uses perpendicularly biased garnet for frequency tuning is currently being constructed for use in the Fermilab Booster. The cavity will operate at twice the fundamental RF frequency, from ~76 - 10⁶ MHz, and will be turned on only during injection, and transition or extraction. Its main purpose is to reduce beam loss as required by Fermilab's Proton Improvement Plan (PIP). After three years of optimization and study, the cavity design has been finalized and all constituent parts have been received. We discuss the design aspects of the cavity and its associated systems, component testing, and status of the cavity construction.

Slides THP2WC01 [16.734 MB]

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THP2WC02

LLRF Studies for HL-LHC Crab Cavities

440

P. Baudrenghien
CERN, Geneva, Switzerland
T. Mastoridis
CalPoly, San Luis Obispo, California, USA

The HL-LHC upgrade includes sixteen Crab Cavities (CC) to be installed on both sides of the high luminosity experiments, ATLAS and CMS. Two issues have been highlighted for the Low Level RF: transverse emittance growth (and associated luminosity drop) caused by CC RF noise, and large collimator losses following a CC trip. A prototype cryomodule with two CCs has been installed in the SPS, and tests have started in May 2018 with beam. This paper briefly reports on preliminary results from the SPS tests. It then presents emittance growth calculations from cavity field phase and amplitude noise, deduces the maximum RF noise compatible with the specifications and presents a possible cure consisting of a feedback on CC phase and amplitude. To reduce the losses following a CC trip we propose to implement transverse tail cleaning via the injection of CC noise with an optimized spectrum, which selectively excites the particles of large transverse oscillation amplitudes.

Slides THP2WC02 [1.943 MB]

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THP2WC03

The Choosing of Magnetic Structure of Isochronous Cyclotron DC-130 for Applied Research

446

I.A. Ivanenko, J. Franko, G.G. Gulbekyan, I.V. Kalagin, N.Yu. Kazarinov
JINR, Dubna, Moscow Region, Russia

At the present time, the activities on creation of the new multipurpose isochronous cyclotron DC130 are carried out at the FLNR, JINR. The cyclotron DC130 is intended for microchip testing, production of track pore membranes and for applied physics. The cyclotron will accelerate the heavy ions with mass-to-charge ratio A/Z from 5 to 8 up to the fixed energies 2 and 4.5 MeV per nucleon. The main magnet and acceleration system of DC130 is based on the U200 cyclotron that now is under reconstruction. At the present paper the method of choosing of main magnet parameters of cyclotron is described.

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