| Paper | Title | Page |
|---|---|---|
MOP075 |
A X-rays Shielded Facility Dedicated to Cryogenic RF Tests of Fully Dressed Spoke Cavities in the Cryomodule CM0 at IPN Orsay | |
|
||
| A bulk Nb superconducting β=0.3 Triple-Spoke (T-Spoke) cavity operating at 352 MHz, was designed at IPN and fabricated thanks to EURISOL project financial support. The cavity will be tested in November 2013 at a new X-rays shielded facility dedicated to cryogenic tests of fully dressed (LHe tank, Magnetic Shields, Fast Active Cold Piezoelectric Tuning System (FACPTS), RF Power coupler) Spoke cavities in the horizontal cryomodule CM0. The CW RF power and cryogenic power @T=2K are 80kW and 120W respectively. Four vertical cold RF tests were performed in a vertical cryostat and the data are reported. All components (cold box, cryogenic lines, He gas heater, RF power system with 2 RF power couplers, LHe bath pumps) were delivered and successfully tested. The cryogenic circuit in CM0 was finished and we successfully mounted the fully dressed T-Spoke cavity. A R.T tuning system was used for static and dynamic mechanical measurements on Single (S-Spoke) and T-Spoke cavities. Mechanical stiffness, transfer function, vibrations, Lorentz detuning were investigated using the FACPTS. Field profile in S-Spoke and T-Spoke cavities were performed using a motorized field perturbation stand. | ||
| MOP085 | Status of the Superconducting Proton Linac (SPL) Cryomodule | 345 |
|
||
| The Superconducting Proton Linac (SPL) is an R&D effort conducted by CERN in partnership with other international laboratories, aimed at developing key technologies for the construction of a multi-megawatt proton linac based on state-of-the-art SRF technology. Such an accelerator would serve as a driver in new physics facilities for neutrinos and/or radioactive ion beams. Amongst the main objectives of this effort, are the development of 704 MHz bulk niobium β=1 elliptical cavities (operating at 2 K and providing an accelerating field of 25 MV/m) and the test of a string of cavities integrated in a machine-type cryo-module. In an initial phase, only four out of the eight cavities of the SPL cryo-module will be tested in a half- length cryo-module developed for this purpose, which nonetheless preserves the main features of the full size machine. This paper presents the final design of the cryo-module and the status of the construction of the main cryostat parts. Preliminary plans for the assembly and testing of the cryo-module at CERN are presented and discussed. | ||
| MOP089 | Design of the ESS Spoke Cryomodule | 357 |
|
||
| The European Spallation Source (ESS) project brings together 17 European countries to develop the world’s most powerful neutron source feeding multidisplinary researches. The superconducting part of the linear accelerator consists in 59 cryomodules housing different superconducting radiofrequency (SRF) resonators among which 28 paired β=0.5 352.2 MHz SRF niobium double Spoke cavities, held at 2K in a saturated helium bath. A prototype Spoke cryomodule with two cavities equipped with their 300kW RF power couplers is now being designed and will be constructed and tested at full power by the end of 2015 for the validation of all chosen technical solutions. It integrates all the interfaces necessary to be operational within a linac machine. Its assembly requires dedicated tooling and procedures in and out of a clean room. The design takes into account an industrial approach for the management of the fabrication costs. This prototype will have to guarantee an accelerating field of 8MV/m while optimizing the energy consumption and will aim at assessing the maintenance operations issues. We propose to present the design of this cryomodule and its related tooling. | ||
| THP018 | Design of a Superconducting 352MHz Fully Jacketed Double-Spoke Resonator for the ESS-Bilbao Proton Linac | 929 |
|
||
| The baseline design for the ESS-Bilbao light-ion linear accelerator and neutron source (a facility compliant with the ESS-AB requirements) has been completed and the normal conducting section of the linac (RFQ and DTL) is at present under detailed design and construction. Starting at 50 MeV, it is proposed to follow this section with a superconducting section composed of double and triple spoke cavities grouped in cryomodules of 2 or 3 cavities reaching a maximum energy of 300 MeV. After an initial R&D program on spoke cavities with an aluminum model, detailed electromagnetic and mechanical studies of a beta 0.50, 352MHz, double spoke cavity were performed. The results of the calculations are presented in this paper. It is proposed to continue this development by the construction and test of the niobium cavities prototypes and initiating the study of a cryo-module with two cavities that could be tested with beam at the ESS-Bilbao facility. | ||
| THP065 | Design of 352.21 MHz RF Power Input Coupler and Window for the European Spallation Source Project (ESS) | 1069 |
|
||
| A 352.21 MHz RF high power coupler window was designed by IPNO to meet the specification requirements for the ESS accelerator project. This designed is based on IPNO’s power coupler developments performed in the framework of the EURISOL Design Study project for which two power couplers using coaxial technology without chokes systems around the ceramic disc have been designed and tested successfully up to 20 kW RF power level in CW mode. For ESS project, the RF power input window was developed and designed to reliability operate at an average power level of 25 kW up to 300 kW in pulsed and continuous wave modes. This 352.21 MHz RF window was developed to remove the chocks usually used and provided the following advantages: more reliability, less expensive to manufacture, better vacuum, easier cleaning, less secondary electron-multipacting with specificity to present a bandwidth close to 1 GHz. | ||
| THP078 | Deformation Tuner Design for a Double Spoke Cavity | 1104 |
|
||
| IPN Orsay is developing the low-beta double Spoke cavities cryomodule for the ESS. Based on previous successfully tested prototypes, a fast/slow tuner has been studied to compensate resonance frequency variations of the cavity during operation. The typical perturbations are coming from LHe pressure variations as well as microphonics and Lorentz force detuning (LFD). Two tuners are being built in order to validate both expected performances and series production feasibility. In this paper, the tuner design of the double Spoke cavity is presented. | ||
| FRIOC01 | Design of the 352 MHz, Beta 0.50, Double-Spoke Cavity for ESS | 1212 |
|
||
| The ESS proton accelerator contains a superconducting sector consisting in three families of superconducting radiofrequency (SRF) bulk niobium cavities, operating at a nominal temperature of 2K: a family of Spoke cavities for the medium energy section followed by two families of elliptical cavities for higher energies. The superconducting Spoke section, having a length of 58.6m, consists of 14 cryomodules, each of them housing two 352.2 MHz β=0.50 Double-Spoke Resonators (DSR). The operating accelerating field is 8MV/m. The choice of the Spoke technology is guided by the high performances of such structures. Benefitting from 10 years of extensive R&D experience carried out at IPNO, the electromagnetic design studies came out with a solution that fulfills requirements of beam dynamics analysis and manufacturing considerations. Pursuing the same objective, the mechanical design of the cavity and its helium vessel were optimized by performing intensive coupled RF-mechanical simulations. We propose to present a review of the RF and mechanical design studies of the Spoke cavity. We will conclude with the integration of the Spoke cavity with its ancillaries inside the cryomodule. | ||
|
Slides FRIOC01 [6.321 MB] | |