TY  - CONF
AU  - Carver, L.R.
AU  - Alekou, A.
AU  - Antoniou, F.
AU  - Appleby, R.B.
AU  - Bartosik, H.
AU  - Bohl, T.
AU  - Burt, G.
AU  - Calaga, R.
AU  - Carlà, M.
AU  - Levens, T.E.
AU  - Mitchell, J.A.
AU  - Papotti, G.
AU  - Welsch, C.P.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - First Machine Developments Result with HL-LHC Crab Cavities in the SPS
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Crab cavities are a critical component within the High Luminosity upgrade project for the Large Hadron Collider (HL-LHC). It is foreseen to use crab cavities in order to compensate the geometric luminosity reduction factor (reduction of the luminous region at the Interaction Point [IP]) due to the beam crossing angle (required for minimizing the impact of the long range beam-beam effects on the single particle beam dynamics) and increase the number of collisions per bunch crossing. In 2018 the first beam tests of crab cavities with protons were performed in the Super Proton Synchrotron (SPS) at CERN. Two vertical superconducting cavities of the Double Quarter Wave (DQW) type were fabricated and installed in the SPS to verify some key components of the cavity design and operation. This paper will present some of the first results relating to the proton beam dynamics in the presence of crab cavities.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 338
EP  - 341
KW  - cavity
KW  - proton
KW  - closed-orbit
KW  - luminosity
KW  - diagnostics
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPGW094
UR  - http://jacow.org/ipac2019/papers/mopgw094.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  - Banon-Caballero, D.
AU  - Boronat, M.
AU  - Catalán Lasheras, N.
AU  - Faus-Golfe, A.
AU  - Gimeno, B.
AU  - Lucas, T.G.
AU  - Millar, W.L.
AU  - Paszkiewicz, J.
AU  - Pitman, S.
AU  - Sánchez Sebastián, V.
AU  - Vnuchenko, A.
AU  - Volpi, M.
AU  - Widorski, M.
AU  - Wuensch, W.
AU  - del Pozo Romano, V.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Dark Current Analysis at CERN’s X-band Facility
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. In this paper, an analysis of dark current is presented for four accelerating structures that were tested and conditioned in CERN’s X-band test facility for CLIC. The dependence on power, and therefore on accelerating gradient, of the dark current signals is presented. The Fowler-Nordheim equation for field emission seems to be in accordance with the experimental data. Moreover, the analysis shows that the current intensity decreases as a function of time due to conditioning, but discrete jumps in the dark current signals are present, probably caused by breakdown events that change the emitters’ location and intensity.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2944
EP  - 2947
KW  - radiation
KW  - operation
KW  - electron
KW  - ECR
KW  - linac
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB059
UR  - http://jacow.org/ipac2019/papers/weprb059.pdf
ER  - 

TY  - CONF
AU  - Verdú-Andrés, S.
AU  - Ben-Zvi, I.
AU  - Burt, G.
AU  - Calaga, R.
AU  - Capatina, O.
AU  - Huque, N.A.
AU  - Li, Z.
AU  - McEwen, E.A.
AU  - Mitchell, J.A.
AU  - Park, H.
AU  - Powers, T.
AU  - Ratti, A.
AU  - Wu, Q.
AU  - Xiao, B.P.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Cryogenic RF Performance of Double-Quarter Wave Cavities Equipped with HOM Filters
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Crab cavities are one of the several components included in the luminosity upgrade of the Large Hadron Collider (HL-LHC). The cavities have to provide a nominal deflecting kick of 3.4 MV per cavity while the cryogenic load per cavity stays below 5 W. Cold RF tests confirmed the required performances in bare cavities, with several cavities exceeding the required voltage by more than 50%. However, the first tests of a Double-Quarter Wave (DQW) cavity with one out of three HOM filters did not reach the required voltage. The present paper describes the studies and tests conducted on a DQW cavity with HOM filter to understand the limiting factor. The recipe to meet the performance specification and exceed the voltage requirement by more than 35% is discussed.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3043
EP  - 3046
KW  - cavity
KW  - HOM
KW  - operation
KW  - cryogenics
KW  - SRF
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB098
UR  - http://jacow.org/ipac2019/papers/weprb098.pdf
ER  - 

TY  - CONF
AU  - Dosanjh, M.
AU  - Aggarwal, A.
AU  - Angal-Kalinin, D.
AU  - Apsimon, R.
AU  - Boogert, S.T.
AU  - Burt, G.
AU  - Coleman, N.
AU  - Collier, P.
AU  - Cross, A.W.
AU  - Konoplev, I.V.
AU  - McIntosh, P.A.
AU  - Militsyn, B.L.
AU  - Pistenmaa, D.A.
AU  - Sheehy, S.L.
AU  - Syratchev, I.
AU  - Wuensch, W.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Collaborative Strategies for Meeting the Global Need for Cancer Radiation Therapy Treatment Systems
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The idea of designing affordable equipment and developing sustainable infrastructures for delivering radiation treatment for patients with cancer in countries that lack resources and expertise stimulated a first International Cancer Expert Corps (ICEC) championed, CERN-hosted workshop in Geneva in November 2016. Which has since been followed by three additional workshops involving the sponsorship and support from UK Science and Technology Facilities Council (STFC). One of the major challenges in meeting this need to deliver radiotherapy in low- and middle-income countries (LMIC) is to design a linear accelerator and associated instrumentation system which can be operated in locations where general infrastructures and qualified human resources are poor or lacking, power outages and water supply fluctuations can occur frequently and where climatic conditions might be harsh and challenging. In parallel it is essential to address education, training and mentoring requirements for current, as well as future novel radiation therapy treatment (RTT) systems.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3526
EP  - 3529
KW  - linac
KW  - electron
KW  - radiation
KW  - vacuum
KW  - permanent-magnet
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPMP038
UR  - http://jacow.org/ipac2019/papers/thpmp038.pdf
ER  -