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Report

The Continuous Electron Beam Accelerator Facility at 12 GeV

Autor: Adderley, P. A., Ahmed, S., Allison, T., Bachimanchi, R., Baggett, K., BastaniNejad, M., Bevins, B., Bevins, M., Bickley, M., Bodenstein, R. M., Bogacz, S. A., Bruker, M., Burrill, A., Cardman, L., Creel, J., Chao, Y. -C., Cheng, G., Ciovati, G., Chattopadhyay, S., Clark, J., Clemens, W. A., Croke, G., Daly, E., Davis, G. K., Delayen, J., De Silva, S. U., Dickson, R., Diaz, M., Drury, M., Doolittle, L., Douglas, D., Feldl, E., Fischer, J., Freyberger, A., Ganni, V., Geng, R. L., Ginsburg, C., Gomez, J., Grames, J., Gubeli, J., Guo, J., Hannon, F., Hansknecht, J., Harwood, L., Henry, J., Hernandez-Garcia, C., Higgins, S., Higinbotham, D., Hofler, A. S., Hiatt, T., Hogan, J., Hovater, C., Hutton, A., Jones, C., Jordan, K., Joyce, M., Kazimi, R., Keesee, M., Kelley, M. J., Keppel, C., Kimber, A., King, L., Kjeldsen, P., Kneisel, P., Koval, J., Krafft, G. A., Lahti, G., Larrieu, T., Lauze, R., Leemann, C., Legg, R., Li, R., Lin, F., Machie, D., Mammosser, J., Macha, K., Mahoney, K., Marhauser, F., Mastracci, B., Matalevich, J., McCarter, J., McCaughan, M., Merminga, L., Michaud, R., Morozov, V., Mounts, C., Musson, J., Nelson, R., Oren, W., Overton, R. B., Palacios-Serrano, G., Park, H. -K., Phillips, L., Philip, S., Pilat, F., Plawski, T., Poelker, M., Powers, P., Powers, T., Preble, J., Reilly, T., Rimmer, R., Reece, C., Robertson, H., Roblin, Y., Rode, C., Satogata, T., Seidman, D. J., Seryi, A., Shabalina, A., Shin, I., Slominski, R., Slominski, C., Spata, M., Spell, D., Spradlin, J., Stirbet, M., Stutzman, M. L., Suhring, S., Surles-Law, K., Suleiman, R., Tennant, C., Tian, H., Turner, D., Tiefenback, M., Trofimova, O., Valente, A. -M., Wang, H., Wang, Y., White, K., Whitlatch, C., Whitlatch, T., Wiseman, M., Wissman, M. J., Wu, G., Yang, S., Yunn, B., Zhang, S., Zhang, Y.

Publikováno v: Phys. Rev. Accel. Beams 27 (2024) 084802

This review paper describes the energy-upgraded CEBAF accelerator. This superconducting linac has achieved 12 GeV beam energy by adding 11 new high-performance cryomodules containing eighty-eight superconducting cavities that have operated CW at an a

Externí odkaz: http://arxiv.org/abs/2408.16880

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Report

Tool-Assisted Learning of Computational Reductions

Autor: Kneisel, Tristan, Radtke, Elias, Schmellenkamp, Marko, Vehlken, Fabian, Zeume, Thomas

Computational reductions are an important and powerful concept in computer science. However, they are difficult for many students to grasp. In this paper, we outline a concept for how the learning of reductions can be supported by educational support

Externí odkaz: http://arxiv.org/abs/2407.18215

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Akademický článek

Successful user operation of a superconducting radio-frequency photoelectron gun with Mg cathodes

Publikováno v: Physical Review Accelerators and Beams, Vol 24, Iss 3, p 033401 (2021)

At the electron linac for beams with high brilliance and low emittance (ELBE) center for high-power radiation sources, the second version of a superconducting radio-frequency (SRF) photoinjector has been put into operation and has been routinely appl

Externí odkaz: https://doaj.org/article/fb5940ebe6da4f0d9f140d0c731dc73f

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Akademický článek

Hydroforming of elliptical cavities

Autor: W. Singer, X. Singer, I. Jelezov, P. Kneisel

Publikováno v: Physical Review Special Topics. Accelerators and Beams, Vol 18, Iss 2, p 022001 (2015)

Activities of the past several years in developing the technique of forming seamless (weldless) cavity cells by hydroforming are summarized. An overview of the technique developed at DESY for the fabrication of single cells and multicells of the TESL

Externí odkaz: https://doaj.org/article/4b7aef571a184220ac3f3ebc752f8295

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Akademický článek

Characterization of a superconducting Pb photocathode in a superconducting rf photoinjector cavity

Autor: R. Barday, A. Burrill, A. Jankowiak, T. Kamps, J. Knobloch, O. Kugeler, A. Matveenko, A. Neumann, M. Schmeißer, J. Völker, P. Kneisel, R. Nietubyc, S. Schubert, J. Smedley, J. Sekutowicz, I. Will

Publikováno v: Physical Review Special Topics. Accelerators and Beams, Vol 16, Iss 12, p 123402 (2013)

Photocathodes are a limiting factor for the next generation of ultrahigh brightness photoinjectors. We studied the behavior of a superconducting Pb cathode in the cryogenic environment of a superconducting rf gun cavity to measure the quantum efficie

Externí odkaz: https://doaj.org/article/fc56454cdabf467eb9eb33929b698fb4

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Akademický článek

Update on coaxial coupling scheme for International Linear Collider-type cavities

Autor: P. Kneisel, J. Sekutowicz

Publikováno v: Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 2, p 022001 (2010)

This paper reports on our efforts to develop a flangeable coaxial coupler for both higher order mode and fundamental coupling for nine-cell ILC-type cavities, which were designed in the early 1990’s for pulsed operation with a duty factor less than

Externí odkaz: https://doaj.org/article/149c1574b2c442c8a14294fb836c261f

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Akademický článek

Measurement of the high-field Q drop in a high-purity large-grain niobium cavity for different oxidation processes

Autor: G. Ciovati, P. Kneisel, A. Gurevich

Publikováno v: Physical Review Special Topics. Accelerators and Beams, Vol 10, Iss 6, p 062002 (2007)

The most challenging issue for understanding the performance of superconducting radio-frequency (rf) cavities made of high-purity (residual resistivity ratio >200) niobium is due to a sharp degradation (“Q-drop”) of the cavity quality factor Q_{0

Externí odkaz: https://doaj.org/article/62758964fc044e74ba28ba1f49002fc7

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Akademický článek

Prototyping of a multicell superconducting cavity for acceleration of medium-velocity beams

Autor: C. C. Compton, T. L. Grimm, W. Hartung, H. Podlech, R. C. York, G. Ciovati, P. Kneisel, D. Barni, C. Pagani, P. Pierini

Publikováno v: Physical Review Special Topics. Accelerators and Beams, Vol 8, Iss 4, p 042003 (2005)

Three 6-cell 805 MHz superconducting cavity prototypes for acceleration in the velocity range of about 0.4 to 0.53 times the speed of light have been fabricated and tested. The quality factors (Q_{0}) were between 7×10^{9} and 1.4×10^{10} at the de

Externí odkaz: https://doaj.org/article/5f6424ed9fac41d5b02f5e3dbb4c1689

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Akademický článek

Proposed continuous wave energy recovery operation of an x-ray free electron laser

Autor: J. Sekutowicz, S. A. Bogacz, D. Douglas, P. Kneisel, G. P. Williams, M. Ferrario, I. Ben-Zvi, J. Rose, J Smedley, T. Srinivasan-Rao, L. Serafini, W.-D. Möller, B. Petersen, D. Proch, S. Simrock, P. Colestock, J. B. Rosenzweig

Publikováno v: Physical Review Special Topics. Accelerators and Beams, Vol 8, Iss 1, p 010701 (2005)

Commissioning of two large coherent light facilities (XFELs) at SLAC and DESY should begin in 2008 and 2011, respectively. In this paper we look further into the future, hoping to answer, in a very preliminary way, two questions. First: What will the

Externí odkaz: https://doaj.org/article/d6c9843430e54303b80503c7030e5533

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