Paper |
Title |
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MOPP014 |
Design of the ESS MEBT Faraday Cup |
106 |
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- A. Rodríguez Páramo, I. Bustinduy, I. Mazkiaran, R. Miracoli, V. Toyos, S. Varnasseri, D. de Cos, C. de la Cruz
ESS Bilbao, Zamudio, Spain
- E.M. Donegani, J.P.S. Martins
ESS, Lund, Sweden
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The European Spallation Source (ESS) is currently under construction and the Medium Energy Beam Transfer (MEBT) is developed by ESS-Bilbao as an in-kind contribution. In the MEBT a set of diagnostics is included for beam characterization, among them the MEBT Faraday Cup is used to measure beam current and as a beam stopper for the commissioning modes. The main challenges for the design and manufacturing of the Faraday Cup are the high irradiation loads and the necessity of a compact design due to the space constraints in the MEBT. We describe the design of the FC, characterized by a graphite collector, required to withstand irradiation, and a repeller for suppression of secondary electrons. For the operation of the Faraday Cup acquisition electronics and control system are developed, all systems have been integrated in the ESS-Bilbao ECR ion source to test operation under beam conditions. In this work, we discuss the design of the Faraday Cup, the results of the tests and how they agree with the expected performance of the Faraday Cup.
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Poster MOPP014 [1.786 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP014
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About • |
paper received ※ 02 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019 |
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MOPP044 |
Status of the Faraday Cups for the ESS linac |
205 |
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- E.M. Donegani, C.S. Derrez, T.J. Grandsaert, T.J. Shea
ESS, Lund, Sweden
- I. Bustinduy, A. Rodríguez Páramo
ESS Bilbao, Zamudio, Spain
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The European Spallation Source (ESS) will be a 5 MW pulsed neutron source, relying on a 2 GeV linac delivering 2.86 ms long pulses with 14 Hz repetition rate. During the commissioning and the tuning phases of the ESS linac, four Faraday Cups (FC) serve as beam dumps and provide an absolute measurement of the proton beam current. This contribution summarizes the challenges in the design and production of all the FCs mainly requiring: - Thermo-mechanical analysis to keep heat load and mechanical stress below the mechanical limits; - Inclusion of an electron repeller to prevent the escape of secondary charged particles from the cup that would limit the accuracy of the current measurements; - Monte Carlo simulations to compute material activation, dose at contact and corresponding necessary shielding; - Design of high-resolution detection circuits for low current to fulfill the requirements on bandwidth, gain and noise. In addition, the performance of the LEBT FC during the commissioning of the ion source and LEBT is reported. The LEBT FC system is under continuous improvement and serves as benchmark for the protection from unwanted operation, and in case of actuator or cooling faults.
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Poster MOPP044 [1.121 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP044
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About • |
paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019 |
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WEPP014 |
A Report on Developments of the BCM and BPM Pickups of the ESS MEBT |
539 |
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- S. Varnasseri, I. Bustinduy, A. Conde, J. Martin, A. Ortega, I. Rueda, A.Z. Zugazaga
ESS Bilbao, Derio, Spain
- R.A. Baron, H. Hassanzadegan, T.J. Shea
ESS, Lund, Sweden
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In the framework of the Spanish In-Kind Contribution (IKC) to the construction of the European Spallation Source (ESS-ERIC), ESS-Bilbao is in charge of providing some key systems for the accelerator. In this paper, design and pre-delivery measurements of non-interceptive devices of MEBT (e.g Beam Position Monitor pick-ups, shielded ACCT and FCT) are reported. Overall there are 8 BPMs distributed in MEBT, which 7 of them are used for the beam position and phase measurements and one BPM is used for the fast timing characterization. The latter is used mainly to characterize the partially chopped bunches and rise/fall time of the Beam Chopper. Furthermore there are two ACCTs, one just attached to the beam dump and the other at the last raft of the MEBT. One FCT combined with the second ACCT gives the complementary information on the fast timing characteristics of the beam pulses.
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Poster WEPP014 [1.291 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP014
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|
About • |
paper received ※ 02 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019 |
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WEPP015 |
ESS Beam Position and Phase Monitor System |
543 |
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- R.A. Baron, H. Hassanzadegan, A. Jansson, H. Kocevar, K.E. Rosengren, T.J. Shea
ESS, Lund, Sweden
- I. Bustinduy, S. Varnasseri
ESS Bilbao, LEIOA, Spain
- F. Grespan, M. Poggi
INFN/LNL, Legnaro (PD), Italy
- T. Gräber
DESY Zeuthen, Zeuthen, Germany
- D. Lipka, S. Vilcins
DESY, Hamburg, Germany
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The European Spallation Source (ESS) is a neutron facility under construction in Lund, Sweden, and established as an European collaboration between different member countries. The machine is a 2 GeV proton LINAC with a nominal beam current of 62.5 mA, 2.86 ms of pulse length and a bunch repetition rate of 352 MHz. The Beam Position and Phase Monitors (BPM) at ESS were designed to satisfy the specifications for the different beam modes, which span from 5 µs pulse length and 6.3 mA beam until the nominal beam condition. The system is designed for standard beam position measurements for beam trajectory correction and for beam phase measurements for cavity phase tuning, imposing restrictions on the sensor design and electronics architecture. Approximately a hundred BPM’s were manufactured and are being installed by partners in collaboration with ESS. The BPM system comprises a MicroTCA.4 electronics based in COTS AMC and RTM modules with custom FPGA firmware implementation and a custom Front-End electronics. In this work, the system architecture, implementation, performance, and test results are presented and discussed.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP015
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|
About • |
paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019 |
|
Export • |
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