Paper | Title | Page |
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TUPO003 | Development of CW Heavy Ion Linac at IMP | 326 |
TUOP08 | use link to see paper's listing under its alternate paper code | |
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A new heavy ion linac as the injector for the Separated Sector Cyclotron (SSC), named SSC-Linac[1], is being under constructed at the national laboratory Heavy Ion Research Facility in Lanzhou (HIRFL). The SSC-Linac mainly consists of a 4-rod RFQ and three IH-DTL cavities which can accelerate ion of A⁄q≤7from 3.73 keV/u to 1.025 MeV/u. Both of themoperating at 53.667MHz had been developed. In the commissioning, ions weresuccessfully accelerated to 0.295MeV/u by IH-DTL1. The beam commissioningof the IH-DTL2 which can accelerate the ion to 0.586MeV/u will come soon. In this paper, the recent R&D progress of the SSC-Linac including the development of key components and the beam commissioning results arepresented. | ||
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Slides TUPO003 [7.335 MB] | |
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Poster TUPO003 [0.810 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO003 | |
About • | paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | |
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TUPO005 | Initial Beam Commissioning of LEAF at IMP | 332 |
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A Low Energy intense-highly-charged ion Accelerator Facility (LEAF), which mainly includes an ECR ion source, LEBT and an 81.25 MHz RFQ, was designed to produce and accelerate heavy ions, from helium to uranium with A/Q between 2 and 7, to the energy of 0.5 MeV/u. The typical beam intensity is designed up to 2 emA CW for the uranium beam. The facility has been successfully commissioned with He+ (A/Q=4) and N2+ (A/Q=7) beams and accelerated the beams in the CW regime to the designed energy of 0.5 MeV/u. Beam properties and transmission efficiencies were measured, indicating a good consistency with simulated data. After having briefly recalled the project scope and parameters, this paper describes the beam commissioning strategy and detailed commissioning results. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO005 | |
About • | paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | |
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TUPO036 | Vertical Test Results of Plasma In-situ Cleaning on Low Beta HWR Cavity | 408 |
TUOP06 | use link to see paper's listing under its alternate paper code | |
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Field emission occurred in SRF cavity is the major limitation to operate at high gradient with stability. The plasma in-situ cleaning for the low beta HWR cavity was carried out to remove the hydrocarbons contaminants on the inner cavity surface. And the vertical test results indicated that the field emission effect was relieved with the increasing of the quench point and emission set-on point. Thus, oxygen active plasma processing can be an effective method to solve the field emission issues for the low beta HWR cavity. | ||
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Slides TUPO036 [1.281 MB] | |
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Poster TUPO036 [0.672 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO036 | |
About • | paper received ※ 11 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019 | |
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THPO005 | High Aspect Ratio Beam Generation with the Phase-space Rotation Technique for Linear Colliders | 685 |
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Funding: This work is partly supported by Grant-in-Aid for Scientific Research (B) and US-Japan Science and Technology Cooperation Program in High Energy Physics. Linear colliders is the only way to realize e+ e− collision at higher energy beyond the limit of ring colliders by the huge synchrotron radiation energy loss. In the linear collider, the beam current should be much smaller comparing to the ring collider to save the required electricity. A way to realize an enough luminosity with the small beam current and less energy spread by Beamstrahlung, is collision in flat beam. This high aspect ratio beam can be made by phase-space rotation technique instead of the conventional way with DR (Damping Ring). We present a simulation of this technique and pilot experiments at KEK-STF and ANL WFA. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO005 | |
About • | paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | |
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THPO051 | The Multi-physics Analysis of LEAF RFQ | 805 |
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The 81.25 MHz CW RFQ is designed to accelerate heavy ions with Q/A from 1/7 to 1/2 at 0.5 MeV/u for the Low Energy Accelerator Facility (LEAF) at the Institute of Modern Physics (IMP) of the Chinese Academy of Science (CAS). The four-vane RFQ consists of six mod-ules with a total length of 5.95 meters, For the CW oper-ating mode, thermal management will be a very important issue, Therefore a multi-physics analysis is necessary to ensure that the cavity can stably operate at the high RF power . The multi-physics analysis process includes RF electromagnetic analysis, thermal analysis, mechanical analysis, and the frequency shift, the cooling water system is used for frequency tunning by the temperature adjustment, and also analyze RFQ undercuts, fixed tuners, and pi-mode rods, the results show that the thermal and structural design of this RFQ is reasonable. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO051 | |
About • | paper received ※ 17 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | |
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THPO052 | High Power Test of the LEAF-RFQ | 808 |
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High power heavy ion drivers require a CW low-frequency accelerator for initial acceleration. A CW four-vane radio frequency quadrupole (RFQ) accelerator is designed to accelerate heavy ions A/q up to 7 from 14 keV/u to 500 keV/u, as a new injector for the Low Energy Accelerator Facility (LEAF) at Institute of Modern Physics (IMP). The measurements of low power test were reported previously. In this paper, the results of high power test of the RFQ, including the test of the acceleration systems and beam profiles, will be presented. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO052 | |
About • | paper received ※ 07 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019 | |
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THPO090 | The Analysis of Module Failure in High Solid-state Amplifier for High Current RFQ | 886 |
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New accelerator RF system was upgraded to the solid-state amplifier in ADS project due to its stable, sustainable and reliable. Until now, newest 80kW SSA was adopted in IMP, operating in 162.5MHz, and over 120 power modules were combined through several synthesizers for 80kW output. but since too many modules were optimized for amplitude and phase in the same time, one or some failure of circulator will lead to injure of whole RF system, when wavelength meets a specific condition, injure would turn out severe accident and heavy loss. In this paper, analyzing and simulating the multi-level synthetic matrix was the important method for ADS accident happened in June 20. 2017, the failure simulated results for RF amplify links under the specific circumstances also was presented simultaneously. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO090 | |
About • | paper received ※ 17 September 2018 paper accepted ※ 31 October 2018 issue date ※ 18 January 2019 | |
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FR2A01 |
Development and Beam Commissioning of 10’25 MeV Superconducting CW Proton Linac for China ADS Project | |
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A 25 MeV CW superconducting proton linac has been developed by collaboration between IMP and IHEP to demonstrate key technologies of ADS linac. The 25 MeV superconducting proton linac is composed of ECR proton source, LEBT, a 2.1 MeV/162.5 MHz four-vane RFQ, MEBT and a superconducting linac section which consists of three cryomodules built by IMP based on HWR cavity at 162.5 MHz frequency and one cryomodule built by IHEP based on SPOKE cavity at 325 MHz. Stable proton beam acceleration with CW 2 mA/10 MeV has been demonstrated successfully at IMP by 12 HWR cavities with two cryomodules operating at 4.5 k. Beam commissioning with pulsed 10 mA/25 MeV and CW 0.2 mA/25 MeV has been conducted. A lot of efforts have been made to achieve a long-term stable CW beam operation during the beam commissioning. Hours continuous operation without beam trip at CW 0.2 mA/18 MeV was achieved. Recently the low level RF control system and other sub-systems are under refurbishment and the next goal of beam commissioning is CW 1 mA/25 MeV. This talk will present development and the latest beam commissioning results of the 10’25 MeV superconducting proton linac and the lessons learned. | ||
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Slides FR2A01 [14.744 MB] | |
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