![]() The nominal intensity is maintained at 100 mA in CW mode. ![]() The main change concerns the output energy of the RFQ cavity which has been limited to 3 MeV. The funding difficulties encountered in years 20 led us to redefine the characteristics and the performances of the accelerator. It originally consisted in the ECR ion source SILHI which delivers more than 100 mA CW at 95 keV, a LEBT for matching the beam to the RFQ to reach 5 MeV beam energy, and followed by a 10 MeV DTL. The IPHI demonstrator (Injector of Protons for High Intensity beams) has to deliver beams of several tens of MW. The main objective of this project is to have technological, industrial and experimental references, to master the conception of such a machine and its further operating. A large domain of applications is concerned, such as for example spallation neutron sources, Accelerator Driven Systems (ADS) for nuclear waste transmutation, production of radioactive ion beams, neutron production (IFMIF) or neutrino and muon factories. Over the last years, the two French national research agencies (CEA and CNRS) have undertaken a large research program in order to study and construct a prototype of the low energy part of a High Power Proton Accelerator (HPPA). The paper will describe this method applied to the IPHI RFQ and some experimental results obtained on the cold model. These rods are situated between the beam axis and the dipole rods, and the tuning range is largely increased. The end plate thickness adjustment is replaced by a “quadrupole rod” –as opposed to the "dipole rod" - length adjustment. To avoid these difficulties, a new way has been investigated. In the case of the last IPHI RFQ segment, the achievable tuning range obtained with the possible plate thickness was not sufficient to adjust the frequency at 352 Mhz without modifying the notch depth, leading to serious engineering problem for the cooling, new thermo- mechanical simulations and drawings. The dipolar modes are adjusted around the accelerator quadrupolar mode by adding dipole rods on the end plates and adjusting their length. The tuning of the end regions of such accelerator with respect to the quadrupole mode, is generally made by machining the thickness of the end plates or increase of the notch in the vanes (LEDA). 3-MeV High Intensity Proton Injector (IPHI) RFQ is the assembly of three 2-m long coupled-segments.
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