12,549 Works

A Multi-pinhole Faraday Cup Device for Measurement of Discrete Charge Distribution of Heavy and Light Ions

Prabir Roy, Shyam Dwaraknath, Fabian Naab, Stephen Taller, Ovidiu Toader & Gary Was
It is a difficult task to identify the beam density distribution profile over discrete areas using a standard Faraday cup, as the measurements are provided for the full aperture geometry of the instrument. Ideally, the intensity of the scintillating material would provide a correlation to the beam density, but the low photon efficiency, damage to the scintillator, and camera resolution all limit the practicality of using this system for assessing the spatial resolution of an...

Nuclotron New Beam Channels for Applied Researches

Evgeny Syresin, Anastasia Bakhmutova, Anton Bogdanov, Andrey Butenko, Roman Gavrilin, Alexander Golubev, Alexei Kantsyrev, Oleg Kozlov, Dimitry Liakin, Nikolay Markov, Vsevolod Panyushkin, Vladimir Skachkov, Grigoriy Trubnikov & Sergey Visotski
Three new experimental areas are organized for applied physics researches in frame of realization of the accelerator facility NICA. New beamlines are under development for applied researches on Nuclotron accelerator. The ion beams with energy of 250-800 MeV/n extracted from Nuclotron will be used for the radio-biological and materials research and modeling of the cosmic rays interactions with microchips. The equipment of two experimental stations is designed by JINR-ITEP collaboration for these applied researches. The...

Approaches to Optimizing Spin Transmission in Lattice Design

Vahid Ranjbar
We present our experiences in optimizing the proposed Rapid Cycling Synchrotron (RCS) injector for the eRHIC Storage ring and the RHIC 2017 lattice. We have develop python code to drive lattice calculations in MADX which are then used to calculate spin resonances using the DEPOL algorithm. This approach has been used to minimize intrinsic spin resonances during the RCS acceleration cycle while controlling lattice parameters such as dispersion and beta functions. This approach has also...

Thermal Simulation of an Energy Feedback Normal Conducting RF Cavity

Moein Fakhari, Klaus Flöttmann, Sven Pfeiffer, Jörg Roßbach, Holger Schlarb & Alireza Yahaghi
Thermal simulation has been performed for an energy feedback normal conducting RF cavity. The cavity is going to be used as a fast actuator to regulate the arrival time of the electron bunches in fs level in FLASH. By measuring the arrival time jitter of one bunch in a bunch train, the designed cavity apply a correcting accelerating or decelerating voltage to the next bunches. The input power of the cavity is provided by a...

A Vertical Phase Space Beam Position and Emittance Monitor for Synchrotron Radiation

Nazanin Samadi, Dean Chapman & Les Dallin
We report on a system (ps-BPM) that can measure the electron source position and angular motion at a single location in a synchrotron bend magnet beamline using a combination of a monochromator and an absorber with a K-edge to which the monochromator was tuned in energy. The vertical distribution of the beam was visualized with an imaging detector where horizontally one part of the beam was with the absorber and the other part with no...

High Position Resolution BPM Readout System with Calibration Pulse Generators for KEK e⁺/e⁻ Linac

Fusashi Miyahara, Kazuro Furukawa, Ryo Ichimiya, Hideki Saotome, Masanori Satoh, Yuji Seimiya & Tsuyoshi Suwada
The KEK e⁺/e⁻ injector linac will be operated in multiple modes for the electron beam injection to 3 independent storage rings, SuperKEKB HER, Photon Factory (PF) Ring and PF-AR, and the positron beam injection into the damping ring and the SuperKEKB LER. The operation modes can be switched every 20 milliseconds. The injector linac is under upgrade for the SuperKEKB, where the required resolution of beam position measurement is less than 10 micrometer. However, the...

Production Tests, Calibration, and Commissioning of Button BPMs for the European XFEL

Daniel Treyer, Boris Keil, Waldemar Koprek & Dirk Lipka
Commissioning of the entire European XFEL started early 2017. More than 300 button-electrode type beam position monitors (BPMs) are used in its cold Linac and warm beam transfer lines. Signal processing in the BPM RF front-end (RFFE) electronics employs signal stretching by chirp filtering, switchable gain stages, digital step attenuators, and peak detection. In this paper we present details on RF front-end production tests, calibration, and BPM beam commissioning results. Furthermore, a calibration pulser circuit...

Numerical and Experimental Study of H⁻ Beam Dynamics in J-PARC LEBT

Takanori Shibata, Kiyoshi Ikegami, Yong Liu, Akihiko Miura, Fujio Naito, K. Nanmo, Hidetomo Oguri, Kiyonori Ohkoshi, Masashi Otani, Katsuhiro Shinto & Akira Takagi
Negative hydrogen ion (H⁻) beam dynamics in J-PARC Low Energy Beam Transport (LEBT) has been investigated by numerical modeling which calculates particle transport with effect of space charge and collision processes. Understandings of H⁻ beam transport in LEBT is important for high transmission rate from Ion Source (IS) to Radio Frequency Quadrupole (RFQ) in J-PARC in higher beam current in future. In 2017, 45 mA beam current of H⁻ has been extracted from IS in...

Commissioning and Operation of an Ultrafast Electron Diffraction Facility as Part of the ATF-II Upgrade at Brookhaven National Laboratory

Mikhail Fedurin, Marcus Babzien, Charles Folz, M. Fulkerson, Karl Kusche, Junjie Li, Robert Malone, Mark Palmer, Timur Shaftan, John Skaritka, Louis Snydstrup, Christina Swinson & Ferdinand Willeke
The Accelerator Test Facility (ATF) at Brookhaven National Laboratory (BNL) is presently carrying out an upgrade, ATF-II, which will provide significantly expanded experimental space and capabilities for its users. One of the new capabilities being integrated into the ATF-II program is an Ultrafast Electron Diffraction (UED) beam line, which was originally deployed in the BNL Source Development Laboratory. Inclusion of the UED in the ATF-II research portfolio will enable ongoing development and extension of the...

Model of the Optimal Parameters Choice for the Charged Particles Beam

Sergei Nemnyugin & Oleg Malafeyev
Problem of the optimal parameters choice for the charged particles beam is considered. The beam is characterized by the set of control parameters and multiple parameters which characterize its quality. So multiple criteria of optimization should be taken into account. Among possible criteria of optimization following ones should be mentioned: energy, intensity, biological efficiency and so on. It is assumed that in general case choice of the control parameters which is optimal for all criteria...

Avoiding Emittance Degradation When Transferring the Beam From and to a Plasma-Wakefield Stage

Antoine Chancé, Xiangkun Li & Phu Anh Phi Nghiem
The plasma-wakefield acceleration technique is known to provide a very strong accelerating gradient (GV/m), up to three orders of magnitude higher than the conventional RF acceleration technique. The drawback is a relatively higher energy spread and especially a huge beam divergence at the plasma exit, leading to an irremediable and strong emittance degradation right after its extraction from the plasma for transferring it to an application or another plasma stage. In this article, we determine...

Vibration Study of Magnet Girder of the HEPS-TF

Zihao Wang, Chunhua Li, Huamin Qu & Haijing Wang
Abstract: There are stringent requirements on beam stability in the High Energy Photon Source (HEPS). The stability of the magnet girder is an extremely important factor for the beam stability. This paper will discuss the influence of ground vibration to the beam stability. This influence will determine the scope of the vibration magnification of the magnet girder. By improving the stiffness of the magnet girder, the influence will be reduced and the beam stability shall...

Beam Transfer to the FCC-hh Collider from a 3.3 TeV Booster in the LHC Tunnel

Wolfgang Bartmann, Michael Barnes, Matthew Fraser, Brennan Goddard, Werner Herr, Janne Holma, Verena Kain, Thomas Kramer, Malika Meddahi, Attilio Milanese, Ranko Ostojić, Linda Stoel, Jan Uythoven & Francesco Velotti
Transfer of the high brightness 3.3 TeV proton beams from the High Energy Booster (HEB) to the 100 TeV centre-of-mass proton collider in a new tunnel of 80–100 km circumference will be a major challenge. The extremely high stored beam energy means that machine protection considerations will constrain the functional design of the transfer, for instance in the amount of beam transferred, the kicker rise and fall times and hence the collider filling pattern. In...

A High Transformer Ratio Scheme for PITZ PWFA Experiments

Gregor Loisch, Alexander Aschikhin, Matthias Groß, Martin Hochberg, Holger Huck, Alberto Martinez De La Ossa, Anne Oppelt, Jens Osterhoff, Yves Renier, Martin Sack & Frank Stephan
In the field of plasma wakefield acceleration (PWFA) significant progress has been made throughout the recent years. However, an important issue in building plasma based accelerators that provide particle bunches suitable for user applications will be a high transformer ratio, i.e. the ratio between maximum accelerating field in the witness and maximum decelerating fields in the driver bunch. The transformer ratio for symmetrical bunches in an overdense plasma is naturally limited to 2*. Theory and...

Beam Halo Measurements using Wire Scanners at ATF2

Shan Liu, Sha Bai, Philip Bambade, Angeles Faus-Golfe, Nuria Fuster-Martínez, Jie Gao, Toshiaki Tauchi, Nobuhiro Terunuma & Dou Wang
Beam halo hitting on the beam pipe after the Interaction Point (IP) can generate a large amount of background for the measurements of the nano meter beam size using the laser interferometer beam size monitor (Shintake monitor) at ATF2. In order to investigate the beam halo transverse distribution, a diamond detector will be installed downstream of the IP. A feasibility study of a transverse halo collimation system to reduce the background for these measurements is...

Verification of the FAIR Control System Using Deterministic Network Calculus

Malte Schütze, Steffen Bondorf & Mathias Kreider
The FAIR control system (CS) is an alarm-based design and employs White Rabbit time synchronization over a GbE network to issue commands executed accurate to 1 ns. In such a network based CS, graphs of possible machine command sequences are specified in advance by physics frameworks. The actual traffic pattern, however, is determined at runtime, depending on interlocks and beam requests from experiments and accelerators. In 'unlucky' combinations, large packet bursts can delay commands beyond...

Novosibirsk Four-Orbit ERL With Three FELs

Nikolay Vinokurov, Vladimir Arbuzov, Konstantin Chernov, Igor Davidyuk, Olga Deichuli, Evgeny Dementyev, Boris Dovzhenko, Yaroslav Getmanov, Yaroslav Gorbachev, Boris Knyazev, Evegeniy Kolobanov, Alexey Kondakov, Victor Kozak, Evgeny Kozyrev, Sergey Krutikhin, Vitaly Kubarev, Gennady Kulipanov, Eduard Kuper, Igor Kuptsov, Grigory Kurkin, Lev Medvedev, Sergey Motygin, Vadim Osipov, Vladimir Ovchar, Victor Petrov … & Vladimir Volkov
The Novosibirsk FEL facility has three FELs, installed on the first, second and fourth orbits of the ERL. The first FEL covers the wavelength range of 90 - 240 mkm at an average radiation power of up to 0.5 kW with a pulse repetition rate of 5.6 or 11.2 MHz and a peak power of up to 1 MW. The second FEL operates in the range of 40 - 80 mkm at an average radiation...

Space Charge Compensation in Low Energy Beam Lines

Frédéric Gérardin, Maud Baylac, Dominique Bondoux, Frédéric Bouly, Antoine Chancé, Nicolas Chauvin, Olivier Napoly, Nicolas Pichoff & Didier Uriot
The dynamics of a high intensity beam with low energy is governed by its space-charge forces which may be responsible of emittance growth and halo formation due to their non-linearity. In a low energy beam transport (LEBT) line of a linear accelerator, the propagation of a charged beam with low energy causes the production of secondary particles created by the interaction between the beam and the background gas present in the accelerator tube. This phenomenon...

Review of LHC On-line Model Implementation and of its Applications

Tobias Persson, Jaime Maria Coello De Portugal, Mattias Fjellstrom, Lukas Malina, Jonne Moeskops, Ghislain Roy, Piotr Skowroński & Agnieszka Szczotka
The online model of the LHC aims to provide an accurate description of the machine at any given time. In order to do so it extracts the current optics in the machine along with other crucial parameters. It also provides the functionality to match the measured orbit using virtual correctors and the measured beta functions using virtual quadrupoles. In this way an accurate effective model can be created. In order to facilitate the use of...

Design Study for a Prototype Alvarez-Cavity for the Upgraded Unilac

Manuel Heilmann, Xiaonan Du, Peter Gerhard, Lars Groening, Michael Kaiser, Sascha Mickat, Anna Rubin & Anja Seibel
The design study describes the prototype Alvarez-tank of the new post-stripper of the UNILAC. A prototype with 17 drift tubes (including quadrupole singulets) of 3 m of total length and 2 m of diameter will be manufactured. This cavity features new drift tube shape profiles to provide for high shunt impedance at a maximum electric surface field of 1 Ek. Additionally, it allows realization and high power testing of an optimized stem configuration for field...

Cyber Threats, the World Is No Longer What We Knew…

Stephane Perez
Security policies are becoming hard to apply as instruments are smarter than ever. Every oscilloscope gets its own stick with a Windows tag, everybody would like to control his huge installation through the air, IOT is on every lips' Stuxnet, the recent Ed. Snowden revelations have shown that cyber threat on SCADAs cannot be only played in James Bond movies. This paper aims to give simple advises in order to protect and make our installations...

Commissioning of the New Experimental FODO Line at the SNS Beam Test Facility

Alexander Aleksandrov, Sarah Cousineau, Kiersten Ruisard, Vasilis Tzoganis, Zhouli Zhang & Alexander Zhukov
The SNS Beam Test Facility consists of a 2.5MeV proton accelerator and a beam line with various diagnostics for high intensity beam dynamics study. A FODO line consisting of 19 quadrupole magnets and a large dynamic range emittance monitor has been added recently. The new setup is design for experimental study of mechanisms of halo formation in mismatched high intensity beams. We present results of the new beam line commissioning with beam.

Simulation and Experimental Studies of a 2.45GHz Magnetron Source for an SRF Cavity with Field Amplitude and Phase Controls

Haipeng Wang, Alan Dudas, Michael Neubauer, Tomasz Plawski & Robert Rimmer
Phase lock to an SRF cavity by using injection signal through output waveguide of a magnetron has been demonstrated [1, 3]. Amplitude control using magnetic field trimming and anode voltage modulation has been studied using MATLAB/Simulink simulations [2]. Based on these, we are planning to use an FPGA based digital LLRF system, which allows applying various types of control algorithms in order to achieve the required accelerating field stability. Since the 1497 MHz magnetron is...

The Development of Vacuum Gauge Monitoring and Control System using Web2CToolkit

Haruno Ishii, Takashi Kosuge & Hiroaki Nitani
The Photon Factory is an accelerator-based light source facility, as a part of the High Energy Accelerator Research Organization (KEK) Japan and STARS (Simple Transmission and Retrieval System) is used as the beamline control system at the Photon Factory. STARS is a message transferring software for small scale control systems with TCP/IP sockets, which works on various types of operating systems. STARS is effective for various control systems and we developed Vacuum Gauge Monitoring and...

Highlights of the XM-3 Cryomodule Tests at DESY

Julien Branlard, Valeri Ayvazyan, Andrea Bellandi, Wojciech Cichalewski, Juergen Eschke, Cagil Gumus, Denis Kostin, Konrad Przygoda, Holger Schlarb & Jacek Sekutowicz
To investigate the feasibility of the continuous wave (cw) upgrade of the European XFEL (E-XFEL) DESY, on-going tests are performed on E-XFEL prototype and production cryomodules since 2011. For these studies, DESY's Cryo-Module Test Bench (CMTB) has been equipped with a 10⁵ kW cw operating IOT in addition to the 10MW pulsed klystron, making CMTB a very flexible test stand, enabling both cw and pulse operation. For these tests, E-XFEL-like LLRF electronics is used to...

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