| Paper | Title | Page |
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| WEPMW020 | Storage-ring Electron Cooler for Relativistic Ion Beams | 2466 |
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Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357 Application of electron cooling at ion energies above a few GeV has been limited due to reduction of electron cooling efficiency with energy and difficulty in producing and accelerating a high-current high-quality electron beam. A high-current storage-ring electron cooler offers a solution to both of these problems by maintaining high cooling beam quality through naturally-occurring synchrotron radiation damping of the electron beam. However, the range of ion energies where storage-ring electron cooling can be used has been limited by low electron beam damping rates at low ion energies and high equilibrium electron energy spread at high ion energies. This paper reports a development of a storage ring based cooler consisting of two sections with significantly different energies: the cooling and damping sections. The electron energy and other parameters in the cooling section are adjusted for optimum cooling of a stored ion beam. The beam parameters in the damping section are adjusted for optimum damping of the electron beam. The necessary energy difference is provided by an energy recovering SRF structure. A prototype linear optics of such storage-ring cooler is presented. |
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| WEPMY031 | The Production of Negative Carbon Ions with a Volume Cusp Ion Source | 2620 |
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| Recent progress has been made at the newly commissioned Ion Source Test Facility (ISTF). Phase II, the final phase of the project, was completed in March 2016. First measurements were performed with D-Pace's TRIUMF licensed H− ion source. The source was first characterized with H− and an extraction study of the H− ions was performed. A study of the production of heavy negative ions with volume cusp sources was started. Measurements with helium revealed no negative ions were extracted. Negative carbon ions were produced with acetylene. The beam composition has been analysed with a spectrometer. | ||
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| WEPMY032 | A PID Control Algorithm for Filament-Powered Volume-Cusp Ion Sources | 2623 |
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| Volume-cusp ion sources require a fast and precise control algorithm to ensure the arc current, and thus the beam current is stable for high-power industrial DC operation. Using D-Pace's TRIUMF [1] licensed filament-powered H volume-cusp ion source, a proportional-integral-derivative (PID) control algorithm was implemented that provides a peak-to-peak beam current variation of ±0.45 % and a root mean square error of 0.025 mA for 10.16 mA of beam current over 60 minutes. The PID parameters were tuned for different set points and the performance of the algorithm is compared for the different settings. Measured arc current stability, and measured beam current as a function of time are presented and the algorithm utilized is described in detail. | ||
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| WEPMY033 | Intermediate Commissioning Results of the 70 mA/50 keV H+ and 140 mA/100 keV D+ ECR Injector of IFMIF/LIPAC | 2625 |
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| The LIPAc accelerator aims to operate 125 mA/CW deuteron beam at 9 MeV to validate IFMIF's accelerators that will operate in CW 125 mA at 40 MeV. The different subsystems of LIPAc have been designed and constructed mainly by European labs and are being installed and commissioned in Rokkasho Fusion Center. The 2.45 GHz ECR injector developed by CEA-Saclay is designed to deliver 140 mA/100 keV CW D+ beam with 99% gas fraction ratio. Its LEBT presents a dual solenoid focusing system to transport and match the beam into the RFQ. Its commissioning continues in 2016 in parallel with the RFQ installation. The normalized RMS emittance at the RFQ injection cone is to be within 0.25π mm·mrad to allow 96% transmission through the 9.81 m long RFQ. In order to avoid activation during commissioning, an equal perveance H+ beam of half current and half energy as nominal with deuterons is used. In this article, the commissioning results with 110 mA/100 keV D+ beam and 55 mA/50 keV H+ beam are first reported. | ||
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| WEPMY035 | Preliminary Commissioning Results of the Proton Source for ESS at INFN-LNS | 2628 |
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| At Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali del Sud (INFN-LNS) - the commissioning of the high intensity Proton Source for the European Spallation Source (PS-ESS) is under way. Preliminary results of plasma diagnostics collected on a testbench called "Flexible Plasma Trap" (FPT) will be correlated to the peculiarities of the magnetic system design and of the microwave injection setup with a view of the possible implications on the beam extraction system. The status of the costruction is presented. | ||
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| WEPMY036 | Laser Ablation Ion Source for Highly Charge-State Ion Beams | 2632 |
| SUPSS037 | use link to see paper's listing under its alternate paper code | |
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The KEK Laser ablation ion source (KEK-LAIS) is un-der development in order to generate highly ionized metal and fully ionized carbon ions for future applica-tions*. Laser ablation experiments have been carried out by using Nd-YAG laser (0.75 J/pulse, 20 ns) at the KEK test bench. Basic parameters such as a charge-state spec-trum and momentum spectrum of the plasma and extract-ed ion beam current have been obtained. Extraction of C ions from the LAIS is described.
* N.Munemoto et al., Rev. Sci. Inst. 85, 02B922 (2014) |
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