TY  - CONF
AU  - Boltz, T.
AU  - Asfour, T.
AU  - Brosi, M.
AU  - Bründermann, E.
AU  - Härer, B.
AU  - Kaiser, P.
AU  - Müller, A.-S.
AU  - Pohl, C.
AU  - Schreiber, P.
AU  - Yan, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Feedback Design for Control of the Micro-Bunching Instability based on Reinforcement Learning
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The operation of ring-based synchrotron light sources with short electron bunches increases the emission of coherent synchrotron radiation (CSR) in the THz frequency range. However, the micro-bunching instability resulting from self-interaction of the bunch with its own radiation field limits stable operation with constant intensity of CSR emission to a particular threshold current. Above this threshold, the longitudinal charge distribution and thus the emitted radiation vary rapidly and continuously. Therefore, a fast and adaptive feedback system is the appropriate approach to stabilize the dynamics and to overcome the limitations given by the instability. In this contribution, we discuss first efforts towards a longitudinal feedback design that acts on the RF system of the KIT storage ring KARA (Karlsruhe Research Accelerator) and aims for stabilization of the emitted THz radiation. Our approach is based on methods of adaptive control that were developed in the field of reinforcement learning and have seen great success in other fields of research over the past decade. We motivate this particular approach and comment on different aspects of its implementation.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 104
EP  - 107
KW  - bunching
KW  - storage-ring
KW  - feedback
KW  - electron
KW  - controls
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPGW017
UR  - http://jacow.org/ipac2019/papers/mopgw017.pdf
ER  - 

TY  - CONF
AU  - Boltz, T.
AU  - Brosi, M.
AU  - Bründermann, E.
AU  - Härer, B.
AU  - Müller, A.-S.
AU  - Schreiber, P.
AU  - Schönfeldt, P.
AU  - Yan, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Perturbation of Synchrotron Motion in the Micro-Bunching Instability
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Short electron bunches in a storage ring are subject to complex longitudinal dynamics due to self-interaction with their own CSR. Above a particular threshold current, this leads to the formation of dynamically changing micro-structures within the bunch, generally known as the micro-bunching instability. The longitudinal dynamics of this phenomenon can be simulated by solving the Vlasov-Fokker-Planck equation, where the CSR self-interaction can be added as a perturbation to the Hamiltonian. This contribution particularly focuses on the comprehension of synchrotron motion in the micro-bunching instability and how it relates to the formation of the occurring micro-structures. Therefore, we adopt the perspective of a single particle and comment on its implications for collective motion. We explicitly show how the shape of the parallel plates CSR wake potential breaks homogeneity in longitudinal phase space and propose a quadrupole-like mode as potential seeding mechanism of the micro-bunching instability. The gained insights are verified using the passive particle tracking method of the Vlasov-Fokker-Planck solver Inovesa.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 108
EP  - 111
KW  - electron
KW  - bunching
KW  - synchrotron
KW  - storage-ring
KW  - radiation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPGW018
UR  - http://jacow.org/ipac2019/papers/mopgw018.pdf
ER  - 

TY  - CONF
AU  - Schreiber, P.
AU  - Boltz, T.
AU  - Brosi, M.
AU  - Härer, B.
AU  - Mochihashi, A.
AU  - Müller, A.-S.
AU  - Papash, A.I.
AU  - Schuh, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Status of Operation With Negative Momentum Compaction at KARA
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - For future synchrotron light source development novel operation modes are under investigation. At the Karlsruhe Research Accelerator (KARA) an optics with negative momentum compaction has been proposed, which is currently under commissioning. In this context, the collective effects expected in this regime are studied with an initial focus on the head-tail instability and the micro-bunching instability resulting from CSR self-interaction. In this contribution, we will present the proposed optics and the status of implementation for operation in the negative momentum compaction regime as well as a preliminary discussion of expected collective effects.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 878
EP  - 881
KW  - optics
KW  - operation
KW  - injection
KW  - quadrupole
KW  - sextupole
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPTS017
UR  - http://jacow.org/ipac2019/papers/mopts017.pdf
ER  - 

TY  - CONF
AU  - Nasse, M.J.
AU  - Bernhard, A.
AU  - Bründermann, E.
AU  - Böhm, A.
AU  - Funkner, S.
AU  - Härer, B.
AU  - Križnar, I.
AU  - Malygin, A.
AU  - Marsching, S.
AU  - Mexner, W.
AU  - Müller, A.-S.
AU  - Niehues, G.
AU  - Ruprecht, R.
AU  - Schmelzer, T.
AU  - Schuh, M.
AU  - Smale, N.J.
AU  - Wesolowski, P.
AU  - Yan, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - First Electron Beam at the Linear Accelerator FLUTE at KIT
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The first electron beams were generated in the 7 MeV section of the short-pulse linear accelerator test facility FLUTE (Ferninfrarot Linac- Und Test-Experiment) at the Karlsruhe Institute of Technology (KIT). In this contribution we show images of the electron beam on a YAG-screen (yttrium aluminum garnet) as well as signals from an integrating current transformer (ICT) and a Faraday cup. Furthermore, the progress of tuning the FLUTE electron bunches for experiments is presented.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 882
EP  - 884
KW  - electron
KW  - laser
KW  - MMI
KW  - linac
KW  - klystron
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPTS018
UR  - http://jacow.org/ipac2019/papers/mopts018.pdf
ER  - 

TY  - CONF
AU  - Gonzalez, L.A.
AU  - Baglin, V.
AU  - Bellafont, I.
AU  - Casalbuoni, S.
AU  - Chiggiato, P.
AU  - Garion, C.
AU  - Huttel, E.
AU  - Kersevan, R.
AU  - Pérez, F.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Results on the FCC-hh Beam Screen Sawtooth at the Kit Electron Storage Ring Kararesults on the Fcc-Hh Beam Screen Sawtooth at the Kit Electron Storage Ring Kara
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - In the framework of the EuroCirCol collaboration (work package 4 "Cryogenic Beam Vacuum System"), the fabrication of the FCC-hh beam screen (BS) prototype has been carried out with the aim of testing it at room temperature on the Karlsruhe Institute of Technology (KIT) 2.5 GeV electron storage ring KARA (KArlsruhe Research Accelerator) light source. The BS prototype was tested on a beamline installed by the collaboration, named as BEam Screen TEstbench EXperiment (BESTEX). KARA has been chosen because its synchrotron radiation (SR) spectrum, photon flux and power match quite well the one foreseen for the 50+50 TeV FCC-hh proton collider. The BS prototype (2 m in length) was manufactured according to the base line design (BD) of the FCC-hh BS. It implements a saw-tooth profile designed to absorb the SR generated at the bending magnets. Also, a laser-ablated anti-electron cloud surface texturing [2] was applied at the BS inner walls. We present here the results obtained at BESTEX and the comparison of the results obtained during irradiation of the saw-tooth profile at different geometric configurations.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1323
EP  - 1326
KW  - photon
KW  - radiation
KW  - vacuum
KW  - experiment
KW  - electron
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPMP036
UR  - http://jacow.org/ipac2019/papers/tupmp036.pdf
ER  - 

TY  - CONF
AU  - Papash, A.I.
AU  - Blomley, E.
AU  - Boltz, T.
AU  - Brosi, M.
AU  - Bründermann, E.
AU  - Casalbuoni, S.
AU  - Gethmann, J.
AU  - Huttel, E.
AU  - Kehrer, B.
AU  - Mochihashi, A.
AU  - Müller, A.-S.
AU  - Ruprecht, R.
AU  - Schuh, M.
AU  - Steinmann, J.L.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - New Operation Regimes at the Storage Ring KARA at KIT
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The storage ring Karlsruhe Research Accelerator (KARA) at KIT operates in a wide energy range from 0.5 to 2.5 GeV. Initially, the ring was designed to serve as a Light Source for synchrotron radiation facility ANKA. Since then different operation modes have been implemented at KARA: in particular, the double bend achromat (DBA) lattice with non-dispersive straight sections, the theoretical minimum emittance (TME) lattice with distributed dispersion, and different versions of low compaction factor optics with highly stretched dispersion function. Short bunches of a few ps pulse width are available at KARA. Low alpha optics have been tested and implemented in a wide operational range of the ring and are now routinely used at 1.3 GeV for studies of CSR-induced beam dynamics and THz bursting in the micro-bunching instability. Different non-linear effects, in particular, residual high order components of magnetic fields generated in insertion devices have been studied and cured. A new operation mode at high vertical tune implemented at KARA essentially improves beam performance during user operation as well as at low alpha regimes.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1422
EP  - 1425
KW  - lattice
KW  - optics
KW  - operation
KW  - injection
KW  - simulation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW016
UR  - http://jacow.org/ipac2019/papers/tupgw016.pdf
ER  - 

TY  - CONF
AU  - Casalbuoni, S.
AU  - Glamann, N.
AU  - Grau, A.W.
AU  - Holubek, T.
AU  - Saez de Jauregui, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Superconducting Undulator Coils with Period Length Doubling
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Only since few years it has been demonstrated experimentally that NbTi based superconducting undulators (SCUs) have a higher peak field on axis for the same gap and period length in operation with electron beam with respect to permanent magnet undulators (even the ones in vacuum and cooled to cryogenic temperatures). Another advantage of NbTi based SCUs with respect to permanent magnet devices is radiation hardness, widely demonstrated for NbTi magnets, which is and will become an increasingly important issue with the small gaps in the newest machines as round beam storage rings and FELs. Moreover, SCU technology allows switching of the period length by changing the current direction in one of separately powered subset of winding packages of the superconducting coils. This feature further broadens the energy range of the emitted photons, required by the different beamlines. To this end 0.5 m long superconducting undulator coils with switchable period length between 17 mm and 34 mm have been developed. In this contribution we describe the design and report on the quench tests, as well as on the magnetic field measurements.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1426
EP  - 1429
KW  - undulator
KW  - vacuum
KW  - FEM
KW  - operation
KW  - storage-ring
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW017
UR  - http://jacow.org/ipac2019/papers/tupgw017.pdf
ER  - 

TY  - CONF
AU  - Härer, B.
AU  - Bründermann, E.
AU  - Kaiser, A.B.
AU  - Müller, A.-S.
AU  - Papash, A.I.
AU  - Ruprecht, R.
AU  - Schaefer, J.M.
AU  - Schuh, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Non-Linear Features of the cSTART Project
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The compact storage ring for accelerator research and technology (cSTART) is being designed and will be realized at the Institute for Beam Physics and Technology (IBPT) of the Karlsruhe Institute of Technology (KIT). One important goal of the project is to demonstrate injection and storage of a laser wakefield accelerator (LWFA) beam in a storage ring. As a first stage the compact linear accelerator FLUTE will serve as an injector of 50 MeV bunches to test the ring’s performance. A highly non-linear lattice of DBA-FDF type was studied extensively. The specific features of ring optics are reported. A special transfer line from FLUTE to cSTART including bunch compressor and non-linear elements is presented that maintains the ultra-short bunch length of FLUTE.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1437
EP  - 1440
KW  - storage-ring
KW  - quadrupole
KW  - sextupole
KW  - lattice
KW  - injection
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW020
UR  - http://jacow.org/ipac2019/papers/tupgw020.pdf
ER  - 

TY  - CONF
AU  - Grau, A.W.
AU  - Casalbuoni, S.
AU  - Glamann, N.
AU  - Saez de Jauregui, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Cryogenic, in-Vacuum Magnetic Measurement Setup for Superconducting Undulators
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The magnetic field quality has a strong impact on the performance of insertion devices (IDs) when installed in synchrotron light sources. Superconducting IDs have the advantage to produce a higher magnetic peak field for a given gap and period length than IDs assembled with permanent magnets. Before installation of a superconducting ID in a synchrotron light source it is of fundamental importance to characterize the magnetic properties by accurate field and field integral measurements. We follow this aim within our R&D program for superconducting undulators (SCUs). In this contribution, we describe the equipment and the challenges of a cryogenic, in vacuum measurement setup to perform magnetic measurements of the local field, the field integrals and the multipole components of in vacuum SCUs assembled in the final cryostat.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1709
EP  - 1712
KW  - vacuum
KW  - undulator
KW  - detector
KW  - GUI
KW  - synchrotron
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPRB015
UR  - http://jacow.org/ipac2019/papers/tuprb015.pdf
ER  - 

TY  - CONF
AU  - D'Auria, G.
AU  - Aicheler, M.
AU  - Aksoy, A.A.
AU  - Alesini, D.
AU  - Apsimon, R.
AU  - Arnesano, J.M.
AU  - Bellaveglia, M.
AU  - Bernhard, A.
AU  - Bosco, F.
AU  - Buonomo, B.
AU  - Burt, G.
AU  - Calvi, M.
AU  - Cardelli, F.
AU  - Castaneda Cortes, H.M.
AU  - Castilla, A.
AU  - Clarke, J.A.
AU  - Croia, M.
AU  - Cross, A.W.
AU  - Dattoli, G.
AU  - Di Mitri, S.
AU  - Diomede, M.
AU  - Dowd, R.T.
AU  - Dunning, D.J.
AU  - Fang, W.D.
AU  - Faus-Golfe, A.
AU  - Ferrario, M.
AU  - Ficcadenti, L.
AU  - Gallo, A.
AU  - Gazis, E.N.
AU  - Gazis, N.
AU  - Geometrante, R.
AU  - Gethmann, J.
AU  - Giribono, A.
AU  - Goryashko, V.A.
AU  - Han, Y.
AU  - Jacewicz, M.
AU  - Janssen, X.J.A.
AU  - Kokole, M.
AU  - Latina, A.
AU  - Liu, X.
AU  - Luiten, O.J.
AU  - Marcos, J.
AU  - Marín, E.
AU  - Mostacci, A.
AU  - Mutsaers, P.H.A.
AU  - Muñoz Horta, R.
AU  - Nguyen, F.
AU  - Palumbo, L.
AU  - Petralia, A.
AU  - Piersanti, L.
AU  - Priem, J.M.A.
AU  - Pérez, F.
AU  - Rochow, R.A.
AU  - Rossi, C.
AU  - Ruber, R.J.M.Y.
AU  - Schmidt, T.
AU  - Schulte, D.
AU  - Spataro, B.
AU  - Stapnes, S.
AU  - Stragier, X.F.D.
AU  - Taylor, G.
AU  - Thompson, N.
AU  - Vaccarezza, C.
AU  - Wu, X.W.
AU  - Wuensch, W.
AU  - Zhang, K.
AU  - Zhang, L.
AU  - Zhu, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - The CompactLight Design Study Project
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The H₂020 CompactLight Project (www. CompactLight.eu) aims at designing the next generation of compact X-rays Free-Electron Lasers, relying on very high gradient accelerating structures (X-band, 12 GHz), the most advanced concepts for bright electron photo injectors, and innovative compact short-period undulators. Compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, and will be significantly more compact, with a smaller footprint,  as a consequence of the lower energy and the high-gradient X-band structures. In addition, the whole infrastructure will also have a lower electrical power demand as well as lower construction and running costs.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1756
EP  - 1759
KW  - FEL
KW  - linac
KW  - electron
KW  - undulator
KW  - brightness
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPRB032
UR  - http://jacow.org/ipac2019/papers/tuprb032.pdf
ER  - 

TY  - CONF
AU  - Schmelzer, T.
AU  - Bernhard, A.
AU  - Bründermann, E.
AU  - Böhm, A.
AU  - Funkner, S.
AU  - Härer, B.
AU  - Križnar, I.
AU  - Malygin, A.
AU  - Marsching, S.
AU  - Mexner, W.
AU  - Müller, A.-S.
AU  - Nasse, M.J.
AU  - Niehues, G.
AU  - Ruprecht, R.
AU  - Schuh, M.
AU  - Smale, N.J.
AU  - Wesolowski, P.
AU  - Yan, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Diagnostics and First Beam Measurements at FLUTE
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - FLUTE (Ferninfrarot Linac- Und Test-Experiment) is a compact versatile linear accelerator at the Karlsruhe Institute of Technology (KIT). It serves as a platform for a variety of accelerator studies as well as a source of strong ultra-short THz pulses for photon science. In the commissioning phase of the 7 MeV low energy section the electron bunches are used to test the different diagnostics systems installed in this section. An example is the split-ring-resonator-experiment. In this contribution we report on the commissioning status of the beam diagnostics and present first beam measurements at FLUTE.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2484
EP  - 2486
KW  - electron
KW  - laser
KW  - cathode
KW  - diagnostics
KW  - experiment
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW010
UR  - http://jacow.org/ipac2019/papers/wepgw010.pdf
ER  - 

TY  - CONF
AU  - Kehrer, B.
AU  - Brosi, M.
AU  - Bründermann, E.
AU  - Funkner, S.
AU  - Müller, A.-S.
AU  - Niehues, G.
AU  - Patil, M.M.
AU  - Rota, L.
AU  - Schuh, M.
AU  - Steinmann, J.L.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Turn-by-Turn Horizontal Bunch Size and Energy Spread Studies at KARA
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The energy spread is an important beam dynamics parameter. It can be derived from measurements of the horizontal bunch size. At the KIT storage ring KARA a fast-gated camera is routinely used for horizontal bunch size measurements with a single-turn resolution for a limited time span. To overcome the limits of the current camera setup in respect to resolution and time span, a high-speed line array with up to 10 Mfps, the KALYPSO system, is foreseen as a successor. The KALYPSO versions range from 256-pixel to 1024-pixel and allow unlimited turn-by-turn imaging of a single bunch at KARA. We successfully tested such a system at our visible light diagnostics port and present first results in this contribution.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2498
EP  - 2500
KW  - synchrotron
KW  - radiation
KW  - detector
KW  - synchrotron-radiation
KW  - storage-ring
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW016
UR  - http://jacow.org/ipac2019/papers/wepgw016.pdf
ER  - 

TY  - CONF
AU  - Steinmann, J.L.
AU  - Brosi, M.
AU  - Caselle, M.
AU  - Kehrer, B.
AU  - Martin, M.
AU  - Müller, A.-S.
AU  - Patil, M.M.
AU  - Schreiber, P.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Continuous Bunch-by-Bunch Reconstruction of Short Detector Pulses
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The KAPTURE system (KArlsruhe Pulse Taking and Ultrafast Readout Electronics), developed at the Karlsruhe Institute of Technology (KIT), was designed to digitize detector pulses during multi-bunch operation at the KIT storage ring KARA (Karlsruhe Research Accelerator). KAPTURE provides digitization for pulses at rates of 500 MHz using up to 4 sampling points per pulse to record each bunch and each turn for potentially unlimited time. The new KAPTURE-2 system now provides eight sampling points per pulse, including baseline sampling between pulses, which allows improved reconstruction of the pulse shape. The advanced reconstruction of the pulse shape is realized with a highly parallelised implementation on GPU. The system will be used for the investigation on longitudinal beam dynamics e.g. by measuring instability induced CSR fluctuations or arrival time oscillations. This contribution will report on first results of the KAPTURE-2 system at KARA.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2501
EP  - 2503
KW  - detector
KW  - bunching
KW  - storage-ring
KW  - experiment
KW  - simulation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW017
UR  - http://jacow.org/ipac2019/papers/wepgw017.pdf
ER  - 

TY  - CONF
AU  - Patil, M.M.
AU  - Bründermann, E.
AU  - Caselle, M.
AU  - Funkner, S.
AU  - Gerth, C.
AU  - Kehrer, B.
AU  - Makowski, D.R.
AU  - Mielczarek, A.
AU  - Müller, A.-S.
AU  - Niehues, G.
AU  - Wang, W.
AU  - Weber, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - An Ultra-Fast and Wide-Spectrum Linear Array Detector for High Repetition Rate and Pulsed Experiments
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Photon science research at accelerators is influenced radically by the developments of sensor and readout technologies for imaging. These technologies enable a wide range of applications in beam diagnostics, tomography and spectroscopy. The repetition rate of commercially available linear array detectors is a limiting factor for the emerging synchrotron applications. To overcome these limitations, KALYPSO(Karlsruhe Linear arraY detector for MHz rePetition rateSpectrOscopy), an ultra-fast and wide-field of view linear array detector operating at several mega-frames per second(Mfps), has been developed. A silicon micro-strip sensor is connected to custom cutting-edge front end ASICs to achieve unprecedented frame rate in continuous readout mode. In this contribution, the third generation of KALYPSO will be presented.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2504
EP  - 2506
KW  - detector
KW  - experiment
KW  - radiation
KW  - electron
KW  - synchrotron
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW018
UR  - http://jacow.org/ipac2019/papers/wepgw018.pdf
ER  - 

TY  - CONF
AU  - Brosi, M.
AU  - Boltz, T.
AU  - Bründermann, E.
AU  - Funkner, S.
AU  - Kehrer, B.
AU  - Müller, A.-S.
AU  - Nasse, M.J.
AU  - Niehues, G.
AU  - Patil, M.M.
AU  - Schreiber, P.
AU  - Schönfeldt, P.
AU  - Steinmann, J.L.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Synchronous Measurements of Electron Bunches Under the Influence of the Microbunching Instability
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The microbunching instability is a longitudinal collective instability which occurs for short electron bunches in a storage ring above a certain threshold current. The instability leads to a charge modulation in the longitudinal phase space. The resulting substructures on the longitudinal bunch profile vary over time and lead to fluctuations in the emitted power of coherent synchrotron radiation (CSR). To study the underlying longitudinal dynamics on a turn-by-turn basis, the KIT storage ring KARA (Karlsruhe Research Accelerator) provides a wide variety of diagnostic systems. By synchronizing the single-shot electro-optical spectral decoding setup (longitudinal profile), the bunch-by-bunch THz detection systems (THz power) and the horizontal bunch size measurement setup (energy spread), three important properties of the bunch during this instability can be measured at every turn for long time scales. This allows a deep insight into the dynamics of the bunch under the influence of the microbunching instability. This contribution will discuss effects like the connection between the emitted CSR power and the deformations in the longitudinal bunch profile on the time scale of the instability.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3119
EP  - 3122
KW  - synchrotron
KW  - radiation
KW  - bunching
KW  - simulation
KW  - storage-ring
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPTS015
UR  - http://jacow.org/ipac2019/papers/wepts015.pdf
ER  - 

TY  - CONF
AU  - Mochihashi, A.
AU  - Blomley, E.
AU  - Boltz, T.
AU  - Huttel, E.
AU  - Kehrer, B.
AU  - Müller, A.-S.
AU  - Schuh, M.
AU  - Teytelman, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Longitudinal Beam Manipulation by RF Phase Modulation at the Karlsruhe Research Accelerator
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - At the storage ring KARA (Karlsruhe Research Accelerator) of the Karlsruhe Institute of Technology (KIT) we have installed a function for the RF phase modulation to the low-level RF system. By choosing proper conditions of the modulation, the electron distribution on the longitudinal phase space can be changed in a large range. There are several applications of this longitudinal manipulation to the accelerator operation: an improvement of the beam lifetime and suppression of collective instabilities. We have performed tracking simulations for the longitudinal beam manipulation by the RF phase modulation. The results have implied that the longitudinal phase space distribution strongly depends on the modulation frequency. We have also performed experiments, which aimed at improving the beam lifetime in 2.5 GeV KARA multi-bunch operations. In this contribution, the low-level RF system at KARA, the simulation and experimental results under the RF phase modulation will be presented. As one of the options of the modulation, we consider manipulation of the internal fine structure in the longitudinal phase space by the modulation.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3123
EP  - 3126
KW  - simulation
KW  - experiment
KW  - synchrotron
KW  - cavity
KW  - beam-loading
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPTS016
UR  - http://jacow.org/ipac2019/papers/wepts016.pdf
ER  - 

TY  - CONF
AU  - Rossmanith, R.
AU  - Aßmann, R.W.
AU  - Bernhard, A.
AU  - Burkart, F.
AU  - Damminsek, K.
AU  - Dorda, U.
AU  - Gethmann, J.
AU  - Jafarinia, F.
AU  - Kaluza, M.
AU  - Marchetti, B.
AU  - Richter, S.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Proposed Beam Test of a Transverse Gradient Undulator at the SINBAD Facility at DESY
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - While Laser Plasma Accelerators produce beams with the high output energy required for FELs, up to now the relatively high energy spread has prohibited FEL lasing. Therefore it was proposed to replace the normal FEL undulators by Transverse Gradient Undulators (TGUs). For a first, small scale test of the TGU concept, a 40 period prototype high gradient superconductive TGU was built at KIT and will be tested with beam at the ARES-linac in the new accelerator test facility SINBAD (Short Innovative Bunches and Accelerators at Desy) at DESY. The proposed tests are summarized in this paper.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3609
EP  - 3611
KW  - undulator
KW  - linac
KW  - electron
KW  - experiment
KW  - radiation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPGW015
UR  - http://jacow.org/ipac2019/papers/thpgw015.pdf
ER  - 

TY  - CONF
AU  - Weikum, M.K.
AU  - Akhter, T.
AU  - Alesini, D.
AU  - Alexandrova, A.S.
AU  - Anania, M.P.
AU  - Andreev, N.E.
AU  - Andriyash, I.A.
AU  - Aschikhin, A.
AU  - Audet, T.
AU  - Aßmann, R.W.
AU  - Bacci, A.
AU  - Barna, I.F.
AU  - Beaton, A.
AU  - Beck, A.
AU  - Beluze, A.
AU  - Bernhard, A.
AU  - Bielawski, S.
AU  - Bisesto, F.G.
AU  - Brandi, F.
AU  - Brinkmann, R.
AU  - Bründermann, E.
AU  - Bussmann, M.H.
AU  - Bussolino, G.
AU  - Büscher, M.
AU  - Chancé, A.
AU  - Chen, M.
AU  - Chiadroni, E.
AU  - Cianchi, A.
AU  - Clarke, J.A.
AU  - Cole, J.
AU  - Couprie, M.-E.
AU  - Croia, M.
AU  - Cros, B.
AU  - Crump, P.A.
AU  - Dattoli, G.
AU  - De Nicola, S.
AU  - Del Dotto, A.
AU  - Delerue, N.
AU  - Dias, J.M.
AU  - Dorda, U.
AU  - Fedele, R.
AU  - Ferran Pousa, A.
AU  - Ferrario, M.
AU  - Filippi, F.
AU  - Fiore, G.
AU  - Fonseca, R.A.
AU  - Galimberti, M.
AU  - Gallo, A.
AU  - Ghaith, A.
AU  - Giove, D.
AU  - Giribono, A.
AU  - Gizzi, L.A.
AU  - Grüner, F.J.
AU  - Habib, A.F.
AU  - Haefner, C.
AU  - Heinemann, T.
AU  - Hidding, B.
AU  - Holzer, B.J.
AU  - Hooker, S.M.
AU  - Hosokai, T.
AU  - Huebner, M.
AU  - Irman, A.
AU  - Jafarinia, F.
AU  - Jaroszynski, D.A.
AU  - Joshi, C.
AU  - Kaluza, M.
AU  - Kando, M.
AU  - Karger, O.S.
AU  - Karsch, S.
AU  - Khazanov, E.
AU  - Khikhlukha, D.
AU  - Knetsch, A.
AU  - Kocon, D.
AU  - Koester, P.
AU  - Kononenko, O.S.
AU  - Korn, G.
AU  - Kostyukov, I.
AU  - Kruchinin, K.O.
AU  - Labate, L.
AU  - Le Blanc, C.
AU  - Lechner, C.
AU  - Leemans, W.
AU  - Lehrach, A.
AU  - Li, X.
AU  - Libov, V.
AU  - Lifschitz, A.
AU  - Litvinenko, V.
AU  - Lu, W.
AU  - Lundh, O.
AU  - Maier, A.R.
AU  - Malka, V.
AU  - Manahan, G.G.
AU  - Mangles, S.P.D.
AU  - Marchetti, B.
AU  - Martinez de la Ossa, A.
AU  - Martins, J.L.
AU  - Mason, P.D.
AU  - Massimo, F.
AU  - Mathieu, F.
AU  - Maynard, G.
AU  - Mazzotta, Z.
AU  - Molodozhentsev, A.Y.
AU  - Mostacci, A.
AU  - Murphy, C.D.
AU  - Müller, A.-S.
AU  - Najmudin, Z.
AU  - Nghiem, P.A.P.
AU  - Nguyen, F.
AU  - Niknejadi, P.
AU  - Osterhoff, J.
AU  - Oumbarek Espinos, D.
AU  - Papadopoulos, D.N.
AU  - Patrizi, B.
AU  - Pattathil, R.
AU  - Petrillo, V.
AU  - Pocsai, M.A.
AU  - Poder, K.
AU  - Pompili, R.
AU  - Pribyl, L.
AU  - Pugacheva, D.
AU  - Romeo, S.
AU  - Rossetti Conti, M.
AU  - Rossi, A.R.
AU  - Rossmanith, R.
AU  - Roussel, E.
AU  - Sahai, A.A.
AU  - Sarri, G.
AU  - Schaper, L.
AU  - Scherkl, P.
AU  - Schramm, U.
AU  - Schroeder, C.B.
AU  - Scifo, J.
AU  - Serafini, L.
AU  - Sheng, Z.M.
AU  - Siders, C.
AU  - Silva, L.O.
AU  - Silva, T.
AU  - Simon, C.
AU  - Sinha, U.
AU  - Specka, A.
AU  - Streeter, M.J.V.
AU  - Svystun, E.N.
AU  - Symes, D.
AU  - Szwaj, C.
AU  - Tauscher, G.E.
AU  - Terzani, D.
AU  - Thompson, N.
AU  - Toci, G.
AU  - Tomassini, P.
AU  - Torres, R.
AU  - Ullmann, D.
AU  - Vaccarezza, C.
AU  - Vannini, M.
AU  - Vieira, J.M.
AU  - Villa, F.
AU  - Wahlstrom, C.-G.
AU  - Walczak, R.
AU  - Walker, P.A.
AU  - Wang, K.
AU  - Welsch, C.P.
AU  - Wiggins, S.M.
AU  - Wolfenden, J.
AU  - Xia, G.X.
AU  - Yabashi, M.
AU  - Zhu, J.
AU  - Zigler, A.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Status of the Horizon 2020 EuPRAXIA Conceptual Design Study
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The Horizon 2020 Project EuPRAXIA (European Plasma Research Accelerator with eXcellence In Applications) is producing a conceptual design report for a highly compact and cost-effective European facility with multi-GeV electron beams accelerated using plasmas. EuPRAXIA will be set up as a distributed Open Innovation platform with two construction sites, one with a focus on beam-driven plasma acceleration (PWFA) and another site with a focus on laser-driven plasma acceleration (LWFA). User areas at both sites will provide access to FEL pilot experiments, positron generation and acceleration, compact radiation sources, and test beams for HEP detector development. Support centres in four different countries will complement the pan-European implementation of this infrastructure.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3638
EP  - 3642
KW  - plasma
KW  - laser
KW  - electron
KW  - acceleration
KW  - site
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPGW026
UR  - http://jacow.org/ipac2019/papers/thpgw026.pdf
ER  - 

TY  - CONF
AU  - Will, A.
AU  - Bastian, Y.
AU  - Bernhard, A.
AU  - Bonura, M.
AU  - Bordini, B.
AU  - Favre, M.
AU  - Lindstrom, B.
AU  - Mentink, M.
AU  - Monteuuis, A.
AU  - Müller, A.-S.
AU  - Oslandsbotn, A.
AU  - Schmidt, R.
AU  - Senatore, C.
AU  - Siemko, A.P.
AU  - Stachon, K.
AU  - Usoskin, A.
AU  - Vaananen, M.P.
AU  - Verweij, A.P.
AU  - Wollmann, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Beam Impact Experiment of 440GeV/p Protons on Superconducting Wires and Tapes in a Cryogenic Environment
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The superconducting magnets used in high energy particle accelerators such as CERN’s LHC can be impacted by the circulating beam in case of specific failure cases. This leads to interaction of the beam particles with the magnet components, like the superconducting coils, directly or via secondary particle showers. The interaction leads to energy deposition in the timescale of microseconds and induces large thermal gradients within the superconductors in the order of 100 K/mm. To investigate the effect on the superconductors, an experiment at CERN’s HiRadMat facility was designed and executed, exposing short samples of Nb-Ti and Nb₃Sn strands as well as YBCO tape in a cryogenic environment to microsecond 440 GeV/p proton beams. The irradiated samples were extracted and are being analyzed for their superconducting properties, such as the critical transport current. This paper describes the experimental setup as well as the first results of the visual inspection of the samples.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 4264
EP  - 4267
KW  - experiment
KW  - proton
KW  - interface
KW  - simulation
KW  - cryogenics
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPTS066
UR  - http://jacow.org/ipac2019/papers/thpts066.pdf
ER  - 

TY  - CONF
AU  - Wollmann, D.
AU  - Bernhard, A.
AU  - Cangialosi, C.
AU  - Cerutti, F.
AU  - D'Angelo, G.
AU  - Danzeca, S.
AU  - Denz, R.
AU  - Favre, M.
AU  - Garcia Alia, R.
AU  - Hagedorn, D.
AU  - Infantino, A.
AU  - Kirby, G.
AU  - Kistrup, L.
AU  - Koettig, T.
AU  - Lendaro, J.
AU  - Lindstrom, B.
AU  - Monteuuis, A.
AU  - Müller, A.-S.
AU  - Rodriguez-Mateos, F.
AU  - Siemko, A.P.
AU  - Stachon, K.
AU  - Tsinganis, A.
AU  - Valette, M.
AU  - Verweij, A.P.
AU  - Will, A.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Characterisation of the Radiation Hardness of Cryogenic Bypass Diodes for the HL-LHC Inner Triplet Quadrupole Circuit
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The powering layout of the new HL-LHC Nb₃Sn triplet circuits is the use of cryogenic bypass diodes, where the diodes are located inside an extension to the magnet cryostat, operated in superfluid helium and exposed to radiation. Therefore, the radiation hardness of different type of bypass diodes has been tested at low temperatures in CERN’s CHARM irradiation facility during the operational year 2018. The forward characteristics, the turn on voltage and the reverse blocking voltage of each diode were measured weekly at 4.2 K and 77 K, respectively, as a function of the accumulated radiation dose. The diodes were submitted to a dose close to 12 kGy and a 1 MeV equivalent neutron fluence of 2.2x10¹⁴,n/cm². After the end of the irradiation campaign the annealing behaviour of the diodes was tested by increasing the temperature slowly to 300 K. This paper describes the experimental setup, the measurement procedure and discusses the results of the measurements.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 4268
EP  - 4271
KW  - radiation
KW  - neutron
KW  - experiment
KW  - quadrupole
KW  - luminosity
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPTS067
UR  - http://jacow.org/ipac2019/papers/thpts067.pdf
ER  -