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WEAD1 | Commissioning and Recent Experimental Results at the Argonne Wakefield Accelerator Facility (AWA) | 2472 |
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Funding: Work supported by the U.S. Department of Energy under contract No. DE-AC02-06CH11357. The commissioning of the upgraded AWA facility has been recently completed. The L-band electron gun has been fully commissioned and has been successfully operated with its Cesium Telluride photocathode at a gradient of 80 MV/m. Single bunches of up to 100 nC, and bunch trains of up to 32 bunches have been generated. The six new pi-mode accelerating cavities bring the beam energy to 75 MeV. Initial measurements of the beam parameters have been performed. This intense beam has been used to drive high gradient wakefields in several structures. A second beamline provides electron bunches to probe the wakefields generated by the intense drive beam. One of the main goals of the facility is to generate short RF pulses with GW power levels, corresponding to accelerating gradients of hundreds of MV/m and energy gains on the order of 100 MeV per structure. |
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Slides WEAD1 [2.091 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEAD1 | |
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WEPWA035 | Initial EEX-based Bunch Shaping Experiment Results at the Argonne Wakefield Accelerator Facility | 2575 |
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Funding: This work is partly supported by POSTECH BK21+ and Argonne National Laboratory A program is under development at Argonne National Laboratory to use an emittance exchange (EEX) beamline to perform longitudinal bunch shaping (LBS). The double dog-leg EEX beamline was recently installed at the Argonne Wakefield Accelerator (AWA) and the goals of the proof-of-principle experiment are to demonstrate LBS and characterize its deformations from the ideal shape due to higher-order and collective effects. The LBS beamline at the AWA consists of insert-able transverse masks mounted on an actuator and four quadrupoles (to manipulate the transverse phase space) before the EEX beamline, which consists of two identical dog-legs and a deflecting cavity. The mask and input beam parameters are varied during the experiment to explore the shaping capability and clarify the deformation sources and their mitigation. Progress on the commissioning of the LBS beamline, initial experimental data and benchmarks to GPT simulations will be presented. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA035 | |
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WEPMN015 | Dark Current Imaging Experiment in an L-band RF Gun | 2952 |
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The localized high electric field enhancement or low work function is the trigger for strong field emission, which however has yet been well experimentally studied. Using an L-band photocathode gun test stand at Argonne Wakefield Accelerator Facility (AWA), we’ve constructed an imaging beam line to observe field emission current from predefined emitters on cathode. Preliminary experiment results are present. Future plan is discussed. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN015 | |
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WEPMN016 | Observation of Dark Current Dependence on Stored Energy in an L-Band RF Gun | 2956 |
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A pin cathode has been installed into an L-band photocathode gun to study the influence of stored energy on field emission. The stored energy was varied by tuning the recess of the cathode in order to have the same E-field on the cathode tip. We have observed 5 times difference of dark current level at the same E-field, while by varying the stored energy by three fold. Dynamics study reveals the difference is not caused by transmission, but by emission process itself. We'll present experiment results and discuss possible mechanisms about the phenomena. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN016 | |
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WEPTY013 | Cs2Te Photocathode Performance in the AWA High-charge High-gradient Drive Gun | 3283 |
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Funding: U.S. Dept of Energy Office of Science under contract number DE-AC02-06CH11357 The unique high-charge L-band, 1.3 GHz, 1.5 cell gun for the new 75 MeV drive beam is in operation at the Argonne Wakefield Accelerator (AWA) facility (see M.E. Conde, this proceedings.) The high-field (> 80 MV/m) photoinjector has a large area, high QE Cesium telluride photocathode (diameter > 30 mm). The photocathode, a crucial component of the upgraded facility, is fabricated on-site. The photoinjector generates high-charge, short pulse, single bunches (Q > 100 nC) and long bunch-trains (Q > 600 nC) for wakefield experiments. The performance of the photocathode for the AWA drive gun is detailed. Quantum efficiency (QE) measurements indicate long, stable photocathode lifetime under demanding conditions. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY013 | |
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