| Paper | Title | Other Keywords | Page |
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| MOPRB075 | Radiation Limits on Permanent Magnets in CBETA | radiation, electron, vacuum, focusing | 745 |
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| The Cornell Brookhaven Energy Recovery Linac Test Accelerator (CBETA), under construction at Cornell, uses Fixed Field Alternating Gradient (FFAG) Halbach magnets made from grade N35EH NdFeB. To reduce the 1% level magnetization errors in fabricated blocks to magnets with better than 0.001 field accuracy, iron wire shimming is necessary. This also limits magnetization changes by external influences to the ~1% level. The ambient radiation field present during CBETA operation can induce permanent magnet demagnetization. The radiation field arises from electrons in the beam halo hitting the vacuum chamber and from residual gas, Touschek and Intra-Beam scattering. The radiation dose rate due to electrons striking the vacuum chamber of a 4 cell straight section of CBETA FFAG magnets was calculated using the many particle Monte Carlo radiation code MCNP6.2. MCNP6.2 has a track-length heating tally for different particles and a collision heating tally that gives energy deposition/mass from all particles in the problem. Calculations show that electron loss has to be a fraction of a watt/m to keep the dose rate at an acceptable level during the accelerator lifetime. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB075 | ||
| About • | paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019 | ||
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| MOPRB076 | CBETA Beam Commissioning Results | linac, MMI, electron, lattice | 748 |
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| We report on the first results of commissioning CBETAwith a fully closed return loop. We repeat much of our early commissioning from the fractional arc test, namely setting up the injection system, calibrating the main linac, and steering the beam through the first splitter line. Most importantly, first results from sending the beam all the way through the FixedField Alternating gradient permanent magnet return arc are described. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB076 | ||
| About • | paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019 | ||
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| TUPRB052 | The Mini-Period Permanent Magnet Staggered Undulator for Compact X-Ray Free Electron Laser | undulator, FEL, electron, radiation | 1797 |
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Funding: Work supported by National Natural Science Foundation of China under grant of 11505174, 11505173 and 11605190. Miniaturization of X-ray free electron laser requires reduction of undulator period length. In this proceeding, a mini-period permanent magnet staggered undulator was proposed, which is free of superconducting solenoid and thus has advantages of easy-manufacture and low-cost. After optimization, it can generate periodic field of peak field 0.71 T with period length 10 mm and pole gap 2 mm, which has been verified on a prototype. Combined with X-band linac, the length of 1 nm XFEL facility using the permanent magnet staggered undulator can be confined within 44 m. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPRB052 | ||
| About • | paper received ※ 30 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019 | ||
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| TUPTS005 | Advanced Beam Transport Solutions for ELIMAIA: A User Oriented Laser-Driven Ion Beamlines | laser, proton, dipole, quadrupole | 1936 |
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| Laser-target acceleration represents a promising alternative to standard accelerators for several potential applications, especially medical ones, but some extreme features make laser-driven ion beams not directly usable. Therefore, a large effort has been recently devoted to development of beam-transport solutions to obtain controlled and reproducible beams. In this framework, a collaboration has been established between INFN-LNS (IT) and Eli-Beamlines-IoP (CZ) to realize a complete transport beam-line, named ELIMED, dedicated to the transport, diagnostics and dosimetry of laser-driven ion beams. The transport beamline is made by three sections: a set of high field gradient permanent magnet quadrupoles with large acceptance is used to collect and inject ions in the selection section; a magnetic chicane made of C-shaped resistive dipoles is able to select beams with high resolution and to work as an active energy modulator. The final beam shaping is done by two resistive quadrupoles. In this contribution the status of the beamline is described together with the tests performed with conventional accelerators at INFN-LNS. Feasibility study of possible upgrades are also reported. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS005 | ||
| About • | paper received ※ 15 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019 | ||
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| THPMP038 | Collaborative Strategies for Meeting the Global Need for Cancer Radiation Therapy Treatment Systems | linac, electron, radiation, vacuum | 3526 |
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| The idea of designing affordable equipment and developing sustainable infrastructures for delivering radiation treatment for patients with cancer in countries that lack resources and expertise stimulated a first International Cancer Expert Corps (ICEC) championed, CERN-hosted workshop in Geneva in November 2016. Which has since been followed by three additional workshops involving the sponsorship and support from UK Science and Technology Facilities Council (STFC). One of the major challenges in meeting this need to deliver radiotherapy in low- and middle-income countries (LMIC) is to design a linear accelerator and associated instrumentation system which can be operated in locations where general infrastructures and qualified human resources are poor or lacking, power outages and water supply fluctuations can occur frequently and where climatic conditions might be harsh and challenging. In parallel it is essential to address education, training and mentoring requirements for current, as well as future novel radiation therapy treatment (RTT) systems. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP038 | ||
| About • | paper received ※ 11 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 | ||
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| THPTS048 | Design of Longitudinal Gradient Bending Magnet of HALS | multipole, synchrotron, lattice, ECR | 4215 |
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| Hefei Advanced Light Source (HALS) is a diffraction limited light source, which was proposed and expected to be built in the next few years by National Synchrotron Radiation Laboratory (NSRL) of China. Just like other new light sources, longitudinal gradient bending magnet (LGB) will be adopted to suppress the beam emittance. The magnet consists of 7 modules with different magnet-ic field. Each module has yoke and poles with the same size but different amount of permanent magnet to gener-ate field gradient. FeNi alloy is used to shunt magnetic flux and thus improve the temperature stability. Correc-tor coil or movable wedge can be used to adjust the field. Impact of magnetization direction error of permanent magnet block and parallelism error of poles on multi-poles is also evaluated. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS048 | ||
| About • | paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019 | ||
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| THPTS071 | Performance of TPS Cryogenic Permanent Magnet Undulators at NSRRC | undulator, vacuum, cryogenics, controls | 4278 |
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| Development of cryogenic permanent magnet un-dulators (CPMUs) is the most recent activity for Phase-II beamlines at the Taiwan Photon Source. A hybrid-type CPMU with a period length of 15 mm, based on PrFeB permanent-magnet materials, is under construc-tion. A maximum effective magnetic field of 1.33 T at a gap of 4 mm is obtained at 80 K. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS071 | ||
| About • | paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 | ||
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| THPTS088 | CBETA Permanent Magnet Production Run | multipole, quadrupole, dipole, undulator | 4318 |
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| 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 containing 64 iron wires per magnet was done at BNL over a period of about 6 months. Average relative field errors of 2.3·10-4 were achieved on the beam region. The magnet strengths vary by type but are of order 10T/m for quadrupole component and up to 0.3T for the dipole. This paper reports on the field quality and timeline achieved in this production process. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS088 | ||
| About • | paper received ※ 11 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019 | ||
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