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The LIPAc accelerator is a 9 MeV, 125 mA CW deuteron accelerator [1] which aims to validate the technology that will be used in the future IFMIF accelerator. Several types of Beam Position Monitors –BPM’sare placed in each section of the accelerator to ensure a good beam transport and minimize beam losses. LIPAc is presently under installation and commissioning of the second acceleration stage at 5 MeV [2]. In this stage two types of BPM’s are used: four striplines to control the position at the Medium Energy Beam Transport line (MEBT), and three striplines to precisely measure the mean beam energy at the Diagnostics Plate. The seven pickups have been installed and assembled in the beamlines after characterization in a wire test bench, and are presently being commissioned in the facility. In addition, the in-house acquisition system has been fully developed at CIEMAT. In this contribution, the results of the beam position monitors characterization, the tests carried out during the assembly and the status of the electronics system are reported. PICKUP MANUFACTURING MBPM Four striplines are installed along the MEBT (Fig. 1) to track the beam from the RFQ to the MEBT. The BPM’s chambers are installed in the middle of the combined magnets (quadrupole and two steerers) as seen in Fig 1. This makes the design, installation and assembly quite challenging, due to the very tight space available. In addition, all the materials should be non-magnetic to avoid any perturbance in the quality of the magnetic field.Three vacuum chambers were manufactured: two containing one BPM each, and a longer one containing two BPM’s located in consecutive magnets. Compact welded bellows are inserted, shielded inside to protect them to the spray particles of a high CW current hadron accelerator, and welded to rotating flanges. Due to the compact design the fabrication (realized by Vacuum Projects in Spain) was quite complicated. The feedthroughs were very prone to crack due to overheating during TIG welding, although the feedthrough manufacturer supported this technique. After many attempts and empirical studies, laser welding had to be used for the first welding whereas the welding of other pieces in the chamber was kept by TIG. Once each BPM body was fabricated, it was welded to the rest of the vacuum chamber. This was also a challenging process, especially in the last chamber with two BPM’s, since the tolerances were quite small. During all the ∗ Work partially supported by the Spanish Ministry of Economy and Competitiveness under project AIC-A-2011-0654 and FIS2013-40860-R † ivan.podadera@ciemat.es manufacturing process, the machined pieces were metrology controlled, taking especial care to the BPM assembly and the coordinates of the fiducial points with respect to the reference frame. Finally, the chambers underwent an ultrasonic cleaning and a vacuum leak test to verify the tightness for a proper operation in LIPAC. Figure 1: Picture of MBP02 mounted in the MEBT between the poles of the second MEBT magnet.

Commisioning of Beam Position and Phase Monitors for LIPAc