12,634 Works

Characterization and Implementation of the Cryogenic Permanent Magnet Undulator CPMU17 at Bessy II

Johannes Bahrdt, Winfried Frentrup, Stefan Gottschlich, Stefan Grimmer, Maryam Huck, Carsten Kuhn, Atoosa Meseck, Christoph Rethfeldt, Ed Rial, Michael Scheer & Bodo Schulz
In fall 2018, the cryogenic undulator CPMU17 was installed in BESSY II. Before installation, the undulator was characterized with an in-vacuum Hallprobe bench and an in-vacuum moving wire. Both systems were developed at HZB. The commissioning of the device included the orbit and tune corrections, optimization of the injection, characterization of the heat dissipation, tuning the Landau cavities for a reduction of the heat dissipation in the taper sections (temperatures below 60°C) and testing of...

Lasers for Novel Accelerators

Leonida Gizzi, Petra Koester, Luca Labate, Francois Mathieu, Zeudi Mazzotta, Guido Toci & Matteo Vannini
Significant progress has been made over the last decade in optical laser performance including repetition rate, average and peak power, and laser-system footprint making these systems attractive for many applications including novel accelerators. Most novel acceleration schemes require high-power lasers. The talk will present drive laser requirements for current novel accelerator schemes, industry plans to meet these requirements, and the future for high-power lasers.

Operations Experience of SNS at 1.4MW and Upgrade Plans for Doubling the Beam Power

John Galambos
In 2018, the SNS begins operation at the design proton beam power of 1.4 MW. This talk will present the critical technical challenges that were overcome in order to take the final step in beam power with a higher than 90% reliability. In addition, the future project of the SNS for doubling the beam power from 1.4 MW to 2.8 MW and construction of second target station will be discussed.

Application of a Phase Space Beam Position and Size Monitor for Synchrotron Radiation

Nazanin Samadi, Dean Chapman, Les Dallin & Xianbo Shi
We will report on a system (ps-BPM) that can measure the electron source vertical position and angular motion along with the vertical source size and angular size at a single location in a synchrotron bend magnet beamline*. This system uses a combination of a monochromator and a filter with a K-edge to which the monochromator was tuned in energy. The vertical distribution of the beam with and without the filter was simultaneously visualized with an...

Extinction Measurement of J-PARC MR with 8 GeV Proton Beam for the New Muon-to-Electron Conversion Search Experiment - COMET

Hajime Nishiguchi, Yuki Fujii, Yoshinori Fukao, Yoshinori Hashimoto, Youichi Igarashi, Satoshi Mihara, Manabu Moritsu, Ryotaro Muto, Pradeep Sarin, Fumihiko Tamura, Masahito Tomizawa & Kazuki Ueno
At J-PARC, extraction tests of a 8GeV pulsed proton beam from Main Ring (MR) have been successfully completed by a team drawn from the Accelerator Laboratory Group and the COherent Muon to Electron Transition (COMET) Experimental Group. The COMET Experiment aims to find new physics beyond the Standard Model by searching for the coherent neutrinoless conversion of a muon to an electron in muonic atoms, so-called mu-e conversion. This requires an extremely clean pulsed beam,...

Tests of a 3D Printed BPM with a Stretched Wire and with a Particle Beam

Nicolas Delerue, Didier Auguste, Julien Bonis, Frederick Gauthier, Stéphane Jenzer & Alexandre Moutardier
We have successfully printed a beam position monitor using 3D printing. After ultra-high vacuum testing and initial measurements with a network analyser we now reports on tests of this BPM using the stretched wire method. The BPM has been installed on a test stand with a wire going through it and electrical pulses have been sent. The signal measured on the pick-ups was compared to that of two conventional BPMs and shows no anomaly specific...

Development of a Pulsed Power Supply Utilizing 13 kV Class SiC-MOSFET

Katsuya Okamura, Kenji Fukuda, Tatsuya Kaito, Hidenori Kitai, Daiki Kumamoto, Soowon Lim, Fujio Naito, KUnihiro Sakamoto, Ken Takayama & Akira Tokuchi
To resolve the drawback of conventional thyratron switches, development of a semiconductor high voltage switch utilizing a 13 kV class SiC-MOSFET developed by Tsukuba Power Electronics Constellations (TPEC) is proceeding. At first, the device evaluation test was carried out with a resistive load circuit. With the conditions of drain voltage of 10 kV and load resistance of 1 kΩ, turn on loss Eon, turn off loss Eoff, rise time Tr and fall time Tf were...

Magnet Design for Siam Photon Source II

Prapaiwan Sunwong, Prapong Klysubun, Thanapong Phimsen, Supachai Prawanta & Porntip Sudmuang
Siam Photon Source II project has been approved and detailed technical design of the accelerator system is currently in progress. The Double Triple Bend Achromat (DTBA) lattice is implemented in the storage ring design for low emittance and more space for insertion devices. Magnets with moderate to high field requirements have been designed, including combined function magnet with the field gradient of 27.1 T/m, quadrupole magnets with the field gradient up to 60 T/m and...

High Field Superconducting Magnet Program for Accelerators in China

Qingjin Xu
High field superconducting magnets are crucial for high-energy particle accelerators. IHEP (institute for High Energy Physics, Beijing) is pursuing critical technologies R for future circular colliders like the Super Proton Proton Collider (SPPC). SPPC will need thousands of high field (12-20 T) superconducting magnets in around 20 years. A long term R roadmap of the advanced high field magnets has been made, aiming to push the technology frontier to the desired level, and a strong...

Results of CEA Tests of SARAF Cavities Prototypes

Guillaume Ferrand, Pol Carbonnier, Fabien Éozénou, Elise Fayette, Grégoire Jullien, Sébastien Ladegaillerie, Fabien Leseigneur, Catherine Madec, Luc Maurice, Nicolas Misiara, Nicolas Pichoff, Olivier Piquet, Alain Pérolat, Christophe Servouin & Lu Zhao
CEA is committed to delivering a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate 5mA beam of either protons to 35 MeV or deuterons to 40 MeV. The SCL consists in 4 cryomodules. The first two cryomodules host 6 7 half-wave resonator (HWR) low beta cavities (β = 0.09) at 176 MHz, and the last two crymodules host 7 HWR medium beta cavities (β = 0.18)....

The SARAF-LINAC Project 2019 Status

Nicolas Pichoff, Dan Berkovits, Romuald Duperrier, Guillaume Ferrand, Bernard Gastineau, Francoise Gougnaud, Marcel Jacquemet, Joseph Luner, Catherine Madec, Amichay Perry, Olivier Piquet, Thomas Plaisant, Eyal Reinfeld, Franck Senée & Didier Uriot
SNRC and CEA collaborate to the upgrade of the SARAF accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). CEA is in charge of the design, construction and commissioning of the MEBT line and the superconducting linac (SARAF-LINAC Project). The prototypes of the 176 MHz NC rebuncher, SC cavities, RF coupler and SC solenoid-Package have been tested recently. Meanwhile, the cryomodules technical specifications have been written and called for tender. This...

First Results of the Analytical Method Used to Reduce Downtime Risk at an Accelerator Facility

Walter Barkley, Michael Borden, Robert Garnett, Mark Gulley, Eron Kerstiens, Martin Pieck, Daniel Rees, Fred Shelley & Brian Smith
The Los Alamos Neutron Science Center (LANSCE), like many other accelerator facilities, was built decades ago and has been repurposed when new missions were adopted. With an ongoing beam availability expectation of at least 80% delivered to the Experimental Areas (EAs), a balance between cost of spare equipment and budget has always been a challenge. Beam availability data has been meticulously captured and binned over the years to completely characterize the Structures, Systems and Components...

Radio Frequency Power Stations for ESS LINAC Spoke Section

Cristina Pasotti, Marco Cautero, Taha Gucin, Carlos Martins & Rutambhara Yogi
26 equivalent 400 kW Radio Frequency Power Station (RFPS) units will be provided by Elettra as part of the Italian in kind contribution to ESS. They will be installed in the LINAC "Spoke Section". Each RFPS will power a single superconducting spoke cavity in pulsed operation at 352.21 MHz. The RFPS is a complete system that operates unmanned, based on a combination of solid state and tetrode amplification’s stages. The tender specification, the RFPS main...

Measurements of Decay and Snapback in Nb₃Sn Accelerator Magnets at Fermilab

Gueorgui Velev, Giorgio Ambrosio, Guram Chlachidze, Joseph DiMarco, Stoyan Stoynev & Thomas Strauss
In recent years, Fermilab has been executing an inten-sive R program on Nb₃Sn accelerator magnets. This program has included dipole and quadrupole models and demonstrators for various programs and projects, including the HL-LHC accelerator upgrade project. A systematic study of the field decay and snapback during the injection portion of a simulated accelerator cycle was executed at the Fermilab Magnet Test Facility. This paper summarizes the recent measurements of the MQXFS1 short quadrupole model and...

Fermilab Superconducting Nb₃Sn High Field Magnet R Program

Gueorgui Velev, Giorgio Ambrosio, Emanuela Barzi, Vadim Kashikhin, Steve Krave, Vito Lombardo, Igor Novitski, Stoyan Stoynev, Daniele Turrioni, Xingchen Xu & Alexander Zlobin
Magnets based on the modern Nb₃Sn conductor are the main candidates for future high-energy hadron colliders. Fermilab as part of the U.S. MDP executes an extensive R program on these high-field magnets. This program includes basic conductor and material R, quench per-formance studies, and building a meter-long high-field demonstrator. This paper summarizes the current status of the program including its recent results.

High Efficiency High Power Resonant Cavity Amplifier For PIP-II

Marcel Gaudreau, David Cope, Erik Johnson, Michael Kempkes, Rebecca Simpson & Nigel Stuart
Diversified Technologies, Inc. (DTI) is developing an integrated resonant-cavity combined solid-state amplifier for the Proton Improvement Plan-II (PIP-II) at Fermilab. The prototype has demonstrated multiple-transistor combining at 70% efficiency, at 675 watts per transistor at 650 MHz. The patent pending design simplifies solid-state transmitters to create straightforward scaling to 200 kW and higher high power levels. A crucial innovation is the reliable "soft-failure" mode of operation; a failure in one or more of the transistors...

High Gradient Quadrupoles for Low Emittance Synchrtrons

Sushil Sharma, Nikolai Mezentsev, Timur Shaftan, Victor Smaluk, Charles Spataro, Toshiya Tanabe & Guimei Wang
A new lattice design has been proposed recently based on a Complex-Bend concept [1,2] for low emittance syn-chrotrons. The dipoles of a standard DBA lattice are replaced in the Complex Bend by high-gradient (~ 450 T/m) quadrupoles interleaved between discrete dipoles. In another version of the Complex Bend [3] the high gradient quadrupoles are displaced transversely along the beam trajectory to generate the required dipole field. In the latter version the quadrupole strength is reduced...

Synchrotron Radiation Heating of the Helical Superconducting Undulator

Jeffrey Dooling, Roger Dejus & Vadim Sajaev
A helical superconducting undulator (HSCU) was installed in the Advanced Photon Source (APS) Storage Ring (SR) during the January 2018 maintenance period. Shortly after the reintroduction of beam into the SR in late January, higher than expected heating was observed in the cryogenic cooling system. Steering the electron beam orbit in the upstream dipole provided reduction of the amount of synchrotron radiation reaching into the HSCU and allowed the device to properly cool and operate....

Phase and Frequency Locked 350 MHz Magnetron

Michael Neubauer, Alan Dudas, Rolland Johnson, Stephen Kahn, Grigory Kazakevich & Milorad Popovic
The 120kW 350 MHz magnetron is being developed for a number of RF systems, chiefly among them, Niowave’s 10 MeV accelerator. Industri-al applications of the magnetron have also been explored. The CW magnetron can be operated in the pulse mode by a novel injection locking system. We report on the status of the program and progress to date

Injection Locked 1497 MHz Magnetron

Michael Neubauer, Mary Anne Cummings, Alan Dudas, Rolland Johnson, Stephen Kahn, Grigory Kazakevich, Milorad Popovic, Robert Rimmer & Haipeng Wang
Muons, In is building an amplitude modulated phase-locked magnetron to replace the klystrons in CEBAF. To do that requires changing the magnetic field at a rate that would induce eddy currents in the standard magnetron. We report on the status of the project to make a stainless steel anode with copper elements to minimize heating while the stainless steel reduces eddy current effects. The construction of the magnetron is two months from completion, while the...

Micro-aligned Solenoid for Magnetized Bunched-beam Electron Cooling of 100 GeV/u Ions

Peter McIntyre, Jeffrey Breitschopf, James Gerity, Joshua Kellams & Akhdiyor Sattarov
Magnetized electron cooling of ion beams requires pre-cise alignment of the electron beam with the equilibrium trajectory of the ion bunch. For the parameters required for JLEIC, a solenoid with bore field ~1 T, length ~30 m, and rms alignment of ~μrad is required. Such precise alignment has never been accomplished in a 1 T solenoid. The design of a micro-aligned solenoid is presented. A gap-separated stack of thin steel washers is located inside the...

CBETA Permanent Magnet Production Run

Stephen Brooks, George Mahler, Robert Michnoff & Joseph Tuozzolo
214 neodymium permanent magnets have been manufactured for the return loop of the CBETA multi-turn ERL being built at Cornell University. There are 5 types of quadrupole and combined-function gradient magnets using a variant of the circular Halbach design. These are made out of NdFeB material and glued into an aluminium housing with water channels for temperature stabilisation. The NdFeB wedges and magnet construction were done by outside companies, while the final "tuning" using inserts...

Design of a CCD-based Laser Alignment Detection System

Jia-Xin Chen, Xiaoye He, Wei Wang & Haiting Zhang
Accelerator online alignment technology is an important means for accelerator stability detecting. A CCD-based laser alignment detection system is designed for the linear accelerator, and the detection distance of the system could reach 100m. The reference comparison method is used to detect the laser imaging position acquired by the reference detector at different times, and to obtain the relative positional deviation of the measurement reference or the tested objects. Through the measurement error analysis, the...

Magnet Design Optimization for Future Hardon Colliders

Vadim Kashikhin, Vito Lombardo & Gueorgui Velev
Fermilab in collaboration with other members of the US Magnet Development Program (MDP) is working on the development of accelerator magnets for future hadron colliders. A 4-layer, 15-T dipole with 60 mm aperture based on Nb₃Sn Low Temperature Superconductor (LTS) has been fabricated and tested. It is an important milestone of demonstrating readiness of the LTS magnet technology for the next generation of hadron colliders. At the same time, design studies aimed at boosting the...

Novel Apparatus and Technique for Measuring RR Resistivity of Tube Coatings at Cryogenic Temperatures

Ady Hershcovitch, Joseph Brennan, Art Custer, Mark Erickson, Henry Poole, Roberto Than, Silvia Verdú-Andrés & Qiong Wu
A unique apparatus for measuring RF resistivity of tubes and coated tubes at cryogenic temperatures is operational at BNL, which to our knowledge is the first of its kind. A folded quarter wave resonator structure of 300 mm length accesses a wide range of frequencies. The structure is cooled in liquid He bath at 4 K. All internal resonator components (except for test samples) were fabricated out of superconducting materials. Consequently, when the resonator is...

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