W. Gai, M. Conde, R. Konecny, J. Power, P. Schoessow, J. Simpson, X. Sun, P. Zou
{"title":"Experimental demonstration of two beam acceleration using dielectric step-up transformer","authors":"W. Gai, M. Conde, R. Konecny, J. Power, P. Schoessow, J. Simpson, X. Sun, P. Zou","doi":"10.1109/PAC.2001.987214","DOIUrl":"https://doi.org/10.1109/PAC.2001.987214","url":null,"abstract":"We report on the experimental results of the dielectric based two beam accelerator (step-up transformer). By using a single high charge beam, we have generated and extracted a high power RF pulse from a 7.8 GHz primary dielectric structure and then subsequently transferred to a second accelerating structure with higher dielectric constant and smaller transverse dimensions. We have measured the energy change of a second (witness) beam passing through the acceleration stage. The measured gradient is >4 times the deceleration gradient. The detailed experiment of set-up and results of the measurements are discussed. Future plans for the development of a 100 MeV demonstration accelerator based on this technique is presented.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128166580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A laser strain gauge for accelerator targets","authors":"Ahmed Hassanein, J. Norern","doi":"10.1109/PAC.2001.986725","DOIUrl":"https://doi.org/10.1109/PAC.2001.986725","url":null,"abstract":"Multi megawatt accelerators can deliver sufficient power to a target to destroy it in a few pulses. In order to look at the response of solid and liquid targets under these high power pulses, we are developing optical methods of measuring surface deformations with time resolutions limited by laser pulse lengths. These methods can be used to examine the surfaces of solids and liquids during elastic deformation and unstable hydrodynamic flows. We present preliminary results of a system designed for target tests using the Brookhaven AGS and the Argonne CHM linac.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123654880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A versatile method of beamline construction","authors":"K.J. Beczek, J. Lewellen","doi":"10.1109/PAC.2001.986714","DOIUrl":"https://doi.org/10.1109/PAC.2001.986714","url":null,"abstract":"At the Advanced Photon Source (APS), a method for beamline construction has been developed that allows the researcher to reconfigure the beamline quickly and easily. This technique has been extensively incorporated into the APS injector test stand. Rather than use a statically designed system, it was decided at the beginning of the project that an approach that emphasized versatility would provide maximum utility. A concise review of similar previous approaches at APS will be explored, followed by a presentation of this method and other possible variations, with a bias toward fabrication, assembly, and operator considerations.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126068978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"High-power testing of 11.424-GHz dielectric-loaded accelerating structures","authors":"S. Gold, W. Gai","doi":"10.1109/PAC.2001.988319","DOIUrl":"https://doi.org/10.1109/PAC.2001.988319","url":null,"abstract":"The design, construction, and bench testing of an X-band travelling-wave accelerating structure loaded with a permittivity=20 dielectric has been published recently by the Argonne Advanced Accelerator Group. We describe a new program to build a test accelerator using this structure. The accelerator will be powered using high-power 11.424-GHz radiation available at the Magnicon Facility at the Naval Research Lab. The magnicon is expected to provide up to 30 MW from each of two WR-90 output waveguide arms in pulses of up to 1-/spl mu/s duration, permitting tests of the dielectric-loaded X-band device at gradients of /spl sim/40 MV/m. The use of higher power pulses (100-500 MW) eventually available at the output of an active pulse compressor driven by the magnicon will permit gradients in excess of 100 MV/m to be achieved.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131298232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Field analysis of a dielectric-loaded rectangular waveguide accelerating structure","authors":"L. Xiao, W. Gai, Xiang Sun","doi":"10.1109/PAC.2001.988312","DOIUrl":"https://doi.org/10.1109/PAC.2001.988312","url":null,"abstract":"In this paper, we present a detailed analysis of the modes of a dielectric-loaded rectangular waveguide accelerating structure. In general, the acceleration field in a synchronous acceleration mode is non-uniform in the two transverse dimensions. However, we could use an array of these structures rotated alternatively by 90 degrees to get a focusing-defocusing force continuously as a simple FODO lattice, while maintaining uniform energy gain. The expressions of characteristic parameters such as R/Q, group velocity and attenuation constant are given. The longitudinal wake field experienced by a relativistic charged particle beam in the structure is also presented. These analytical results are also compared with numerical calculations using the MAFIA code suite demonstrating the validity of our analytic approach.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117074849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Bauer, C. Darve, P. Limon, N. Solyak, I. Terechkine, M. Pivi, W. Turner, S. Sharma
{"title":"Synchrotron radiation issues in the VLHC","authors":"P. Bauer, C. Darve, P. Limon, N. Solyak, I. Terechkine, M. Pivi, W. Turner, S. Sharma","doi":"10.1109/PAC.2001.988036","DOIUrl":"https://doi.org/10.1109/PAC.2001.988036","url":null,"abstract":"Fermilab and other DOE high energy physics laboratories are studying the possibility of a Very Large Hadron Collider (VLHC) for operation in the post-LHC era. The current VLHC design foresees a 2-staged approach, where the second stage (referred to as VLHC-2) has a proton energy up to 100 TeV at a peak luminosity of 2/sup ./10/sup 34/ cm/sup -2/ sec/sup -1/. The protons are guided through a large 233 km circumference ring with 10 T bending magnets using Nb/sub 3/Sn superconductor at 5 K. The synchrotron radiation (SR) power emitted by the beam in such a machine is /spl sim/5 W/m/beam. However, other VLHC scenarios with smaller rings and higher luminosity result in SR power levels exceeding this value, reaching 10 or even 20 W/m/beam. Intercepting and removing this power in a cryogenic environment is a major challenge. In this paper a discussion of SR in the VLHC-2, and various approaches to the issue, are presented.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115048980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preconceptual design of an injector for an NLC Engineering Test Facility","authors":"A. Todd, H. Bluem, C. Bohn","doi":"10.1109/PAC.2001.988275","DOIUrl":"https://doi.org/10.1109/PAC.2001.988275","url":null,"abstract":"The preconceptual design of an S-band photo-injector system for a Next Linear Collider (NLC) Engineering Test Facility (ETF) at Fermi National Accelerator Laboratory (FNAL) has been completed. A photocathode gun will deliver a range of bunch charges up to 4 nC at around 190 MeV. The projected performance is 2.5 /spl pi/ mm-mrad rms normalized transverse emittance at 1 nC and 6.7 /spl pi/ mm-mrad at 3.6 nC bunch charge, for 0.5 mm rms radius spherical bunches with an energy spread of less than 0.1%. We describe the proposed beamline and the performance achieved in end-to-end simulations.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132428496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Barcikowski, G. Goeppner, J. Norem, E. Rotela, B. Rusthoven, S. Sharma, L. Teng, K. Thompson, R. Assmann, K. Cornelis, E. Keil, O. Groebner, S. Belomestnykh, G. Dugan, R. Talman, C. Johnstone, T. Sen, A. Tollestrup
{"title":"An e/sup +/e/sup -/ collider in the VLHC tunnel","authors":"A. Barcikowski, G. Goeppner, J. Norem, E. Rotela, B. Rusthoven, S. Sharma, L. Teng, K. Thompson, R. Assmann, K. Cornelis, E. Keil, O. Groebner, S. Belomestnykh, G. Dugan, R. Talman, C. Johnstone, T. Sen, A. Tollestrup","doi":"10.1109/PAC.2001.988155","DOIUrl":"https://doi.org/10.1109/PAC.2001.988155","url":null,"abstract":"We describe the design of an e/sup +/e/sup -/ collider that could be installed in the tunnels of the VLHC to run before that machine. We consider the arguments required to maximize the luminosity and indicate what effects would limit the machine performance. We also describe the primary technical issues involved with the construction of the components and consider how costs could be minimized.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"325 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116122745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design and prototype tests of a large-aperture 37-53 MHz ferrite-tuned booster synchrotron cavity","authors":"M. Champion, T. Berenc, M. May, J. Reid","doi":"10.1109/PAC.2001.986506","DOIUrl":"https://doi.org/10.1109/PAC.2001.986506","url":null,"abstract":"The Booster synchrotron at Fermilab employs eighteen 37-53 MHz ferrite-tuned double-gap coaxial radiofrequency cavities for acceleration of protons from 400 MeV to 8 GeV. The cavities have an aperture of 2.25 inches and operate at 55 kV per cavity. Future high duty factor operation of the Booster will be problematic due to unavoidable beam loss at the cavities resulting in excessive activation. The power amplifiers, high maintenance items, are mounted directly to the cavities in the tunnel. A proposed replacement for the Booster, the Proton Driver, will utilize the Booster radiofrequency cavities and requires not only a larger aperture, but also higher voltage. A research and development program is underway at Fermilab to modify the Booster cavities to provide a 5-inch aperture and a 20% voltage increase. A prototype has been constructed and high power tests have been completed. The cavity design and test results are presented.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122254158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Andreev, D. Chichili, C. Christensen, J. DiMarco, V. Kashikhin, P. Schlabach, C. Sylvester, I. Terechkine, J. Tompkins, G. Velev, A. Zlobin
{"title":"Field quality of the Fermilab Nb/sub 3/Sn high field dipole model","authors":"N. Andreev, D. Chichili, C. Christensen, J. DiMarco, V. Kashikhin, P. Schlabach, C. Sylvester, I. Terechkine, J. Tompkins, G. Velev, A. Zlobin","doi":"10.1109/PAC.2001.988130","DOIUrl":"https://doi.org/10.1109/PAC.2001.988130","url":null,"abstract":"A short Nb/sub 3/Sn dipole model based on a single-bore cos-theta coil with a cold iron yoke has been fabricated and tested at Fermilab. Field quality was measured at room temperature during magnet fabrication and at liquid helium temperature. This paper reports the results of magnetic measurements. The geometrical harmonics, coil magnetization effects caused by persistent currents in the superconductor, eddy currents in the cable, and the \"snapback\" effect at injection are presented and compared with theoretical predictions.","PeriodicalId":313758,"journal":{"name":"PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130323014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}