Ab initio method for dose estimation in a linear electron accelerator P. Wesolowski, E. Bründermann, M. Hagelstein, E. Huttel, A.-S. Müller, R. Ruprecht, M. Schuh, M. Schwarz, O. Zwernemann Radsynch17, Hsinchu, Taiwan, 20.04.2017 KIT DESY PSI F erninfrarot L inac- U nd T est E xperiment KIT – University of the State of Baden-Wuerttemberg and ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 1 ANKA Synchrotron Radiation Facility www.kit.edu nasse@kit.edu National Research Center of the Helmholtz Association of intense far-infrared / THz pulses
Outline Project Goals Compare different coherent THz radiation generation schemes in FLUTE (here radiation safety related, s. overview talk M. Hagelstein) simulation and experiment: Building Coherent Synchrotron Radiation (CSR) Assets Coherent Edge Radiation (CER) Issues and solutions Coherent Transition Radiation (CTR) RS-related components Systematic bunch compression studies: FLUTE – F erninfrarot L inac- U nd T est- E xperiment Different compression schemes Estimations for approval license Wide charge range from 1 pC up to 3 nC per bunch Gamma dose from absorber Wide bunch length range from 1 fs up to 300 fs Air activation in hall Create intense THz radiation: (Gamma,n) Spectral range up to 10 THz (thermal n, Gamma) Up to 1 mJ energy per pulse Spallation High electric peak fields of several MV/cm Serve as a test bench: New beam diagnostics methods and tools Synchronization on a fs level ANKA Synchrotron ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 2 ANKA Synchrotron Radiation Facility Ab initio method for dose estimation in P. Wesolowski 2 nasse@kit.edu of intense far-infrared / THz pulses 2 Radiation Facility a linear electron accelerator
FLUTE Building and assets Project Goals Using across diagonal ~15 m Leaves space for upgrades Compare different coherent THz radiation generation schemes in / new devices simulation and experiment: ANKA (expertise, RSOs) Coherent Synchrotron Radiation (CSR) On site of a former nuclear Coherent Edge Radiation (CER) Experimental research facility (expertise, Coherent Transition Radiation (CTR) hall restricted access) Systematic bunch compression studies: Different compression schemes Wide charge range from 1 pC up to 3 nC per bunch FLUTE Wide bunch length range from 1 fs up to 300 fs ANKA Create intense THz radiation: Laser clean THz measure- Spectral range up to 10 THz Control room ment room Air room KIT Campus North Up to 1 mJ energy per pulse lock High electric peak fields of several MV/cm Serve as a test bench: New beam diagnostics methods and tools Synchronization on a fs level Ab initio method for dose estimation in ANKA Synchrotron ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 3 ANKA Synchrotron Radiation Facility P. Wesolowski 3 a linear electron accelerator nasse@kit.edu of intense far-infrared / THz pulses 3 Radiation Facility
Inherited row building Project Goals 15m x 13m x 12m(h) hall Compare different coherent THz radiation generation schemes in Former experimental / >1.5 meter concrete walls simulation and experiment: irradiation hall of a door Thick revolving door Coherent Synchrotron Radiation (CSR) isochronous cyclotron for isotope production Coherent Edge Radiation (CER) Coherent Transition Radiation (CTR) hall (hist.) Systematic bunch compression studies: Different compression schemes Wide charge range from 1 pC up to 3 nC per bunch basement (hist.) Wide bunch length range from 1 fs up to 300 fs Create intense THz radiation: Spectral range up to 10 THz Up to 1 mJ energy per pulse High electric peak fields of several MV/cm Serve as a test bench: New beam diagnostics methods and tools Synchronization on a fs level Ab initio method for dose estimation in ANKA Synchrotron ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 4 ANKA Synchrotron Radiation Facility P. Wesolowski 4 a linear electron accelerator nasse@kit.edu of intense far-infrared / THz pulses 4 Radiation Facility
Project Goals Very good for the start, but… Compare different coherent THz radiation generation schemes in simulation and experiment: Coherent Synchrotron Radiation (CSR) Decontamination (clearance procedure) … Coherent Edge Radiation (CER) provided by Safety Department of KIT Coherent Transition Radiation (CTR) Systematic bunch compression studies: Approval license… support by Safety Different compression schemes Department of KIT ( Unit Consulting & Wide charge range from 1 pC up to 3 nC per bunch Approvals Licensing ) Wide bunch length range from 1 fs up to 300 fs Create intense THz radiation: Unknown dark currents in the gun Spectral range up to 10 THz Up to 1 mJ energy per pulse Despite of thick walls – local shielding is crucial High electric peak fields of several MV/cm Serve as a test bench: New beam diagnostics methods and tools Synchronization on a fs level Ab initio method for dose estimation in ANKA Synchrotron ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 5 ANKA Synchrotron Radiation Facility P. Wesolowski 5 nasse@kit.edu of intense far-infrared / THz pulses 5 a linear electron accelerator Radiation Facility
Project Goals FLUTE layout Phase 2 Final electron energy ~ 41 MeV Compare different coherent THz radiation generation schemes in simulation and experiment: Electron bunch charge 0.001 - 3 nC Coherent Synchrotron Radiation (CSR) Electron bunch length 1 - 300 fs Laser driven- Phase 1 injector rf gun Coherent Edge Radiation (CER) Pulse repetition rate 10 Hz 7 MeV Coherent Transition Radiation (CTR) THz E-Field strength up to 1.2 GV/m Systematic bunch compression studies: Different compression schemes Wide charge range from 1 pC up to 3 nC per bunch Phase 2 Wide bunch length range from 1 fs up to 300 fs 41 MeV Create intense THz radiation: Spectral range up to 10 THz Up to 1 mJ energy per pulse High electric peak fields of several MV/cm Klystron Serve as a test bench: Beam dump New beam diagnostics methods and tools (schematic) M.J. Nasse et al. , Rev. Sci. Instrum. 84 , 022705 (2013) Synchronization on a fs level Ab initio method for dose estimation in ANKA Synchrotron ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 6 ANKA Synchrotron Radiation Facility P. Wesolowski 6 a linear electron accelerator nasse@kit.edu of intense far-infrared / THz pulses 6 Radiation Facility
Radiation safety related components Project Goals Compare different coherent THz radiation generation schemes in simulation and experiment: 3 GHz rf-gun Coherent Synchrotron Radiation (CSR) 3 GHz linac old Coherent Edge Radiation (CER) Coherent Transition Radiation (CTR) 3 GHz linac brand new Systematic bunch compression studies: Klystron Different compression schemes Beam guidance Wide charge range from 1 pC up to 3 nC per bunch Movable screens Wide bunch length range from 1 fs up to 300 fs Slits Create intense THz radiation: Magnetic chicane Spectral range up to 10 THz Dump Up to 1 mJ energy per pulse Hall volume High electric peak fields of several MV/cm Serve as a test bench: New beam diagnostics methods and tools Synchronization on a fs level Ab initio method for dose estimation in ANKA Synchrotron ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 7 ANKA Synchrotron Radiation Facility P. Wesolowski 7 a linear electron accelerator nasse@kit.edu of intense far-infrared / THz pulses 7 Radiation Facility
Project Goals 3 GHz gun Compare different coherent THz radiation generation schemes in simulation and experiment: Coherent Synchrotron Radiation (CSR) Coherent Edge Radiation (CER) Coherent Transition Radiation (CTR) 4MeV scanner (German Cancer Systematic bunch compression studies: Research Center, Different compression schemes Heidelberg) Wide charge range from 1 pC up to 3 nC per bunch Wide bunch length range from 1 fs up to 300 fs Property Unit Value Create intense THz radiation: Frequency GHz 2.998 Spectral range up to 10 THz Cells 2.5 Up to 1 mJ energy per pulse Peak E-Field MV/m ~120 High electric peak fields of several MV/cm Peak power MW ~20 Serve as a test bench: Output energy MeV 7 New beam diagnostics methods and tools Synchronization on a fs level Ab initio method for dose estimation in ANKA Synchrotron ANKA Users‘ Meeting, 13.-14.10.2014 FLUTE – A versatile linac-based source 8 ANKA Synchrotron Radiation Facility P. Wesolowski 8 nasse@kit.edu of intense far-infrared / THz pulses 8 a linear electron accelerator Radiation Facility
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