| Paper | Title | Other Keywords | Page |
|---|---|---|---|
| WEPRO087 | Magnetic-field Measurements of Superconducting Magnets for a Heavy-ion Rotating-gantry and Beam-tracking Simulations | ion, heavy-ion, quadrupole, simulation | 2159 |
|
|||
| Manufacture of superconducting rotating-gantry for heavy-ion radiotherapy is currently in progress. This rotating gantry can transport heavy ions having 430 MeV/nucleon to an isocenter with irradiation angles of over 0-360 degrees, and enable advanced radiation-therapy. The three-dimensional scanning-irradiation method is performed in this rotating gantry. Therefore, uniformity of magnetic field is quite important since scanned beams traverse through these superconducting magnets before reaching to the isocenter. In the present work, we precisely measured the magnetic-field distributions of the superconducting magnets for the rotating gantry. We used Hall probes to measure the magnetic field. The magnetic-field distributions were determined by measuring Hall voltage, while moving the Hall probes on a rail, which has the same curvature as a center trajectory of beams. The measured-field distributions were compared with calculated distributions with a three-dimensional electromagnetic-field solver, the OPERA-3D code. Furthermore, beam-tracking simulations were performed by using the measured magnetic-field distributions to verify the design of the superconducting magnets. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO087 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
| WEPRO101 | A Compact Superconducting 330 MeV Proton Gantry for Radiotherapy and Computed Tomography | proton, dipole, target, magnet-design | 2202 |
|
|||
|
Funding: Work supported by STFC Cockcroft Institute Grant No. ST/G008248/1 The primary advantage of proton beam therapy as a cancer treatment is its ability to maximize the radiation dose delivered to the target volume and minimize the dose to surrounding healthy tissue, due to the inherently narrow Bragg peak at the end of the proton range. This can be further enhanced by imaging the target volume and surrounding tissues using proton Computed Tomography (pCT), which directly measures the energy loss from individual protons to infer the tissue density. Proton energies up to 330 MeV are required for pCT. We describe a superconducting gantry design which can deliver protons for both therapy and pCT with a similar size to existing treatment gantries. The use of ten identical combined-function superconducting dipole magnets minimizes the weight and technical development required. Based on experience with superconducting magnets for carbon gantries it should be possible to change the magnetic field sufficiently quickly to perform spot-scanning over successive layers without inducing quenching. It is envisaged that a combination of cryogenic cooling and cryogen-free cooling will be used to achieve the required operating temperature for the magnet windings. |
|||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO101 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
| WEPRI087 | Magnetic Field Measurement System for the SuperKEKB Final Focus Superconducting Magnets | quadrupole, dipole, luminosity, factory | 2693 |
|
|||
| SuperKEKB are now being constructed with a target luminosity of 8×1035 which is 40 times higher than KEKB. This luminosity can be achieved by the "Nano-Beam" scheme, in which both beams should be squeezed to about 50 nm at the beam interaction point, IP. The beam final focusing system consists of 8 superconducting quadrupole magnets, 4 superconducting solenoids and 43 superconducting corrector coils. The magnetic field measurement systems with the vertical cryostats were designed and constructed for performing the acceptance test of these magnets at 4 K. The field measurements are performed by the 6 different harmonic coils and a Hall probe. The higher order multi-pole field distributions along the magnet axes are very important for the beam operation, and then these distributions are measured with the 20 mm long harmonic coils. The integral fields of quadrupole magnets are measured with the 600 mm long harmonic coils. We will describe the magnetic field measurement system. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI087 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
| WEPRI093 | Welding and Quality Control for the Consolidation of the LHC Superconducting Magnets and Circuits | controls, operation, vacuum, monitoring | 2709 |
|
|||
| The first LHC long shutdown was driven by the need to consolidate the 13 kA splices between the superconducting magnets to safely attain its center of mass design energy of 14 TeV. Access to the splices requires the opening of welded sleeves by machining. After consolidation, the sleeves are re-welded using a TIG orbital welding. The welding process has been modified from the original “as-new” installation in order to better adapt to the “as repaired” situation. The intervention has been thoroughly prepared through qualifications, organisation of teams, their training and follow-up. Quality control is based on the qualification of equipment, process and operators; the recording of production parameters; regular process audits and production witness samples; visual inspection through an official certifying body. The paper also describes welding and quality control of special intervention cases, with issues of difficult access requiring innovative solutions. This work concerns over 10 000 welds and a team of 40 engineers and technicians over a period of 18 months. The experience and lessons learnt will be applicable to similar large complex projects. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI093 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
| WEPRI108 | Liquid Helium Technologies at Cryogenic Complex of the Heavy Ion Collider NICA | cryogenics, collider, booster, ion | 2752 |
|
|||
| NICA (Nuclotron-based Ion Collider fAcility), presently under construction at JINR, will be, upon its completion, among the most advanced research instruments of the physics community. The facility is aimed at providing collider experiments with heavy ions up to uranium (gold at the beginning stage) with a centre of mass energy up to 11 GeV/u and an average luminosity up to 1027 cm-2 s−1. The NICA cryogenics includes a large number of technical ideas and solutions never used before. The most significant of these solutions are the fast cycling superconducting magnets, cooling by the two-phase helium flow, an unusually short period of time for cool down till the operating temperature, parallel connection of cooling channels of the magnets, «wet» turbo expanders, screw compressors with the outlet pressure of more than 25 bars and jet pumps for liquid helium. These technical solutions allow one to construct an efficient and reliable cryogenic system of the NICA complex. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI108 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
| THPRI005 | The Mechanical and Vibration Studies of the Final Focus Magnet-cryostat for SuperKEKB | ground-motion, interaction-region, quadrupole, vacuum | 3770 |
|
|||
| Construction of the SuperKEKB has been progressed in KEK. The target luminosity of the SuperKEKB is 8×1035 cm-2s−1, which is 40 times larger than the KEKB. The vertical beam sizes of electron and positron must be squeezed to the level of 50 nano-meter at the interaction point. The beam final focus system for the SuperKEKB consists of 4-superconducting (SC) quadrupole doublets, 43 SC-correctors, 4 SC-compensation solenoids. The designs of the cryostats in the left and right side with respect to the beam interaction point are being studied with the progress of the magnet designs. In the design works, the support structure of each cryostat, strength of the cryostat components and support rods for supporting cold mass are investigated. As for the vibration issue, vibration properties of the superconducting quadrupole magnets due to the ground motion has been studied. Also vibration properties of the concrete bridges where the two cryostats will be placed in the interaction region were investigated and measured. We will present the cryostat designs and these vibration studies in this paper. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI005 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||