Development of the Beam Position Monitors for the Diagnostics of the Test Beam Line in the CTF3 at CERN.

Garrigos, Garcia; José, Juan

doi:10.4995/thesis/10251/34327

Cited by 3 publications

(7 citation statements)

References 5 publications

(9 reference statements)

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“…The first step is to find a suitable method that allows to inject signal components in such a broad frequency range. This goal can be achieved using a coaxial waveguide testbench, such as the one designed at IFIC for the measurement of the frequency response of the TBL inductive BPMs [66]. The only necessary modification is to adapt the interconnecting flanges to those of the stripline BPM.…”

Section: Methodsmentioning

confidence: 99%

“…The beam will be steered in a range of approximately ±5 mm for each plane, displacing the F-type quadrupole at position 0800, using the mover at position 0805 as actuator. The TBL inductive BPMs [7] that will provide the reference readings for the calculation of the expected positions are those located at positions 0850 and 0910.…”

Section: Linearity and Sensitivity Parametersmentioning

confidence: 99%

“…Especially relevant in the project of this thesis is the Test Beam Line (TBL) at CLEX, as it will allow to test our BPMs with the previously described beam, the closest alike to the future CLIC DB as received in the decelerator. The BPMs of TBL [7] will be used as reference.…”

Section: The Clic Test Facility 3 (Ctf3)mentioning

confidence: 99%

“…The large bandwidth and the fact that all sensitive parts are installed outside of the vacuum are the main advantages of this BPM type. A modified version of the previously described design has been developed for TBL at CTF3 [7]. …”

Section: Stripline Pusmentioning

confidence: 99%

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Beam Position Monitoring in the Clic Drive Beam Decelerator Using Stripline Technology

Morell¹

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Section: Methodsmentioning

confidence: 99%

Section: Linearity and Sensitivity Parametersmentioning

confidence: 99%

Section: The Clic Test Facility 3 (Ctf3)mentioning

confidence: 99%

Section: Stripline Pusmentioning

confidence: 99%

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Beam Position Monitoring in the Clic Drive Beam Decelerator Using Stripline Technology

Morell¹

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“…Once the simulation studies demonstrated the feasibility of the method, an existing test bench [79] was adapted for its validation. Several necessary elements of the bench were designed, procured and characterised using microwave measurements.…”

mentioning

confidence: 99%

Development of direct measurement techniques for the in-situ internal alignment of accelerating structures.

Munoz¹

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(UPV) for giving me the privileged opportunity to perform this work and PhD thesis. My special thanks go to the PACMAN leader, Dr. Hélène Mainaud-Durand, for her committement striving for the success of the project. My deep and eternal acknowledgements to my supervisor at CERN, Dr. Nuria Catalán Lasheras, for entrusting me with this responsibility, for her endless paciente and smart contributions in the development of this work; to my Ph.D. supervisors Dr. Ángeles Faus Golfe and Dr. Vicente Boria Esbert, for their dedication, involvement and bright professional and human guidance along these years. I would like to seize this opportunity to to thank the valuable help I obtained from Anastasiya Solodko and Serge Lebet with the conceptual design of the test bench, mechanical designs and manufacturing. I am also very grateful to César Blanch Gutiérrez and Dr. Juan Jose Garcia Garrigós for their kind technical assistance at IFIC. I highlight the collaboration from Guy Deferne and Olaf Dunkel in the manufacturing of the crucial wirepositioning systems. I highly appreciate the many times Pablo Sobrino Monpean, Dr. Matteo Volpi and Philippe Guyard carried the heavy test bench from the radiofrequency to the metrology laboratory. Thanks to the team involved in the imperative metrology measurements and analysis: Dr. Ahmed Cherif, Didier Glaude, Mathieu Duquenne, Dominique Pugnat and Cyril Haerinck. I emphasize the valuable innovative ideas and fruitful discussions with Dr.

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Design and higher order optimisation of final focus systems for linear colliders

Marín Lacoma

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The accelerator and particle physics communities are considering a lepton Linear Collider LC as the most appropriate machine to carry out high precision particle physics research in the TeV energy regime. The Compact Linear Collider CLIC and the International Linear Collider ILC are the two proposals for the future e+e- LC. Both designs achieve a luminosity L above 10^(34) cm-2 s-1 at the interaction point IP, satisfying the particle physics requirements. The LC consists of different systems, being the Final Focus System FFS the last one before colliding the beam at the IP. It is responsible to focus the beams at sizes in the range of nanometres by means of the Final Doublet FD. The FFS designs of the CLIC and ILC projects are based on a new local chromaticity correction scheme which has never been experimentally tested before. The Accelerator Test Facility ATF2 at KEK (Japan) aims to experimentally verify the feasibility of the FFS based on this novel scheme. The present thesis is devoted to the design and higher order optimisation of FFS for linear colliders based on the local chromaticity correction scheme. The CLIC design luminosity L0 is 5.9·10^(34) cm-2 s-1 assuming head-on collisions. However the beams cross each other at the IP forming an angle of 20 mrad. Due to this crossing scheme the luminosity would be reduced by 90%. Crab cavities are dedicated to tilt the bunches in order to provide head-on like collisions preserving the design L0. In this thesis different solutions that recover the design luminosity for the CLIC FFS are proposed. The designs of a new ATF2 Nominal and Ultra-low beta* lattices, to test the feasibility of the ILC and CLIC FFS respectively, are presented in this thesis. The expected IP vertical beam sizes sy* for these lattices are 38 and 23 nm respectively, at this beam size regime the magnetic field quality of the FFS magnets is a concern. Indeed, the evaluated sy* with the measured multipole components is 100% for the Nominal lattice and 400% for the Ultra-low beta* lattice. The study of the higher order aberrations performed in this thesis is crucial for identifying possible cures that minimise the observed beam size growth. Different solutions have been studied: (i) replacing the FD by better field quality magnets, (ii) swapping the ATF2 quadrupole magnets according to their skew sextupole component and (iii) modifying the lattice optics. The new lattice designs ATF2 Bx2.5By1.0 and ATF2 Ultra-low betay* are based on the prosposed solutions. The impact of the multipoles components is effectively minimsed for both new designs, achieving a sy* equal to 38 and 27 nm ,respectively. The tuning study of the FFS determines its feasibility under realistic error conditions. 100 machines with different initial error configurations are used to address this problem. The tuning simulation study for the alternative CLIC FFS design takes into account BPM resolution, the effect of synchrotron radiation and the misalignment errors of the magnets, being the later a critical parameter on the tuning performance of the system. The motion of the magnetic centre when shunting the quadrupole magnet might represent a limiting factor for further improvement of its alignment. Dedicated measurements at ATF2 have shown a motion of the magnetic centre below 1 micrometre for a shunting variation of 20%. Under this alignment condition the tuning study of the CLIC FFS shows that 80% of the machines reach a L equal or above than L0. The errors included in the tuning study of the ATF2 lattices are misalignments, tilts and miss-powering of the ATF2 FFS magnets. The simulated tuning results show that 80% of the machines reach a final sy* that does not exceed in more than 11% and 35% the design sy* for the ATF2 Bx2.5By1.0 and Ultra-low beta_y* lattices respectively. These results demonstrate the theoretical feasebility of FFS based on the novel chromaticity correction scheme.

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Development of the Beam Position Monitors for the Diagnostics of the Test Beam Line in the CTF3 at CERN.

Cited by 3 publications

References 5 publications

Beam Position Monitoring in the Clic Drive Beam Decelerator Using Stripline Technology

Beam Position Monitoring in the Clic Drive Beam Decelerator Using Stripline Technology

Development of direct measurement techniques for the in-situ internal alignment of accelerating structures.

Design and higher order optimisation of final focus systems for linear colliders

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