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Read our most recent paper!

September 2014

Advanced Scintillator Detector Concept (ASDC): A Concept Paper on the Physics Potential of Water-Based Liquid Scintillator

DAEδALUS and IsoDAR NEWS

Summer 2014

H2+ Beam Tests for IsoDAR at BEST Cyclotrons in Vancouver

Our most recent tests at the BEST Cyclotron Systems, Inc. facility in Vancouver, Canada allowed us to continue our investigation into the performance of the IsoDAR injection system. The test VIS from LNFN-LNS was found to be a reliable source of H2+ capable of producing more than 12mA of H2+. Two separate plasma chambers were tested, and it was found that there was a moderate improvement in H2+ production using a smaller radius plasma chamber. Several measurments regarding space charge compensation were made for future evaluation and some other phenomena predicted by the beamline simulations were confirmed. Notably, it was found that upon focusing the H2+, the protons became over-focused and blast a hole through the H2+, creating a hollow beam. This effect was hinted at by the WARP similations and intensity profiles form last year but confirmed this year with photos. Tests involving the spiral inflector indicate that we will be able to inject into the cyclotron at even higher energies, thus helping reduce space charge effects from the high current beam. The spiral inflector's efficiency was found to be greater than 85% and matched remarkably well with the simulations. Everything considered, these tests indicate that we are on track to develop the injection system that IsoDAR requires.


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The test bench at BEST Cyclotron Inc. The VIS is located on the far right, behind the high voltage cage. The extracted H2+ beam travels left to right and is dynamically modified as it travels through the beamline and is finally injected into the 1MeV test cyclotron seen on the left.

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A novel beam alignment system. The H2+ beam traveling from right to left impinges on a tungsten cross indicating its position in the beamline.

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The hollow beam effect. The over-focused protons puncture a hole in the H2+ beam. Slight misalignment in the beamline causes the hole to be off-center.

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Long exposure image of the beam entering the Faraday cup. The purple color arises from the mixture in Balmer Apha/Beta/Gamma series emissions of Hydrogen.

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