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WP2: Injector developments

The optimization of the MYRRHA injector, in which fault tolerance is not applicable, deserves on-going effort, now with a strong emphasis on obtaining relevant experimental results of the different accelerating structures of such an injector.

Within the present injector reference design, settled during the EUROTRANS project, the 17 MeV injector consists of an ECR-ion source, a 3 MeV Radio-Frequency-Quadrupole (RFQ), two room temperature CH-cavities and four superconducting CH-cavities. All RF structures are operated at 352 MHz in CW mode. CH-cavities are multi-cell RF drift tube structures with high efficiency leading to a very compact linac layout (about 13 m). The use of these cavities minimizes the number of required elements and related sub-systems like tuners, couplers, RF amplifiers and low level RF controls significantly, minimizing the complexity and therefore optimising the reliability. During EUROTRANS, first prototypes have been developed and tested successfully, but preparing the MYRRHA first phase and its injector engineering needs further focus.

Within WP2 it is first of all planned to perform a comparison between the present 352 MHz reference design and a 176 MHz solution. As a matter of fact, the use of a lower frequency would allow using a 4-rod RFQ as first accelerating structure instead of a 4-vane-RFQ. This choice could minimize costs for R&D and production, construction time and the overall technical risk, keeping the main linac above 17 MeV unchanged.

The RFQ being the first accelerating structure of the linac, and one of the most crucial ones, it deserves special effort and high priority. The MYRRHA RFQ will be fully designed and engineered, and a short test section of this RFQ will be built in order to test its behaviour with full RF power. To fill the energy gap between the RFQ and the first superconducting cavity, two room temperature CH-cavities are foreseen in the MYRRHA injector scheme. It is also planned to perform a full design of these cavities, especially with respect to the required CW operation, and to possibly perform high power tests using a relevant prototype. Finally, a new optimized superconducting CH-cavity prototype is presently under construction. The goal within WP2 is to test it under realistic conditions in a horizontal cryomodule fully equipped with high power couplers and tuning systems, and assess its performances.

This WP2 “Injector Developments” is ensured by IAP and articulated in four tasks, outlined in the following.

• Task 2.1: 352 MHz Vs 176 MHz injector comparison & choice
Partners: IAP, CNRS, SCK•CEN
Due date of deliverable: January 2012

• Task 2.2: RF test of a superconducting CH-cavity in a horizontal cryomodule
Partner: IAP
Due date of deliverable: July 2014

• Task 2.3: Design of a room-temperature CH-cavity for MYRRHA
Partner: IAP
Due date of deliverable: July 2013

• Task 2.4: Design of the MYRRHA RFQ & associated short-section test
Partners: IAP, SCK•CEN, KUL
Due date of deliverable: January 2014

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