LINAC2014 - List of Authors (Fagotti, E.)

Paper	Title	Page
MOPP087	Construction of the Modules of the IFMIF-EVEDA RFQ	257
	A. Pepato, E. Fagotti, F. Grespan, A. Palmieri, A. Pisent, C. R. Roncolato INFN/LNL, Legnaro (PD), Italy R. Dima, L. Ferrari, E. Udup INFN- Sez. di Padova, Padova, Italy A. Margotti INFN-Bologna, Bologna, Italy P. Mereu INFN-Torino, Torino, Italy
	The IFMIF project aims to produce an intense neutron flux to test and qualify materials suitable for the construction of fusion power plants. We are working on the engineering validation phase of the project, which consists on the construction of a linear accelerator prototype to be installed and commissioned in Rokkasho. The RFQ is composed of 18 modules flanged together for a total length of 9.8m designed to accelerate the 125mA D⁺ beam to 5MeV at a frequency of 175MHz. The mechanical specifications are very challenging, tight tolerances are required on the machining and on the brazing process. The line is subdivided into 3 Super Modules of 6 modules each. The production of the High Energy portion has been completed and delivered, while the Low Energy one is performing the acceptance test. They were commissioned to external firms. The production of the Intermediate Energy portion has been done in house (INFN) and will be commissioned soon. The 1st modules (16, 17 and 2) were produced adopting 2 brazing steps, while for all the remaining ones we adopted a single brazing step. In this paper the production status and the development of the brazing procedure will be described.

MOPP088	MUNES a Compact Neutron Source for BNCT and Radioactive Wastes Characterization	261
	A. Pisent, P. Colautti, E. Fagotti INFN/LNL, Legnaro (PD), Italy
	At INFN LNL (Legnaro Italy) it has been built a high intensity Radio Frequency Quadrupole (RFQ) structure, able to produce a 5 MeV proton beam of 30 mA. Coupled with a Be target such a beam can generate a neutron flux of 10¹⁴ n/s, with a spectrum centered in the MeV region (that has been recently characterized in detail at LNL accelerators). This neutron flux can be moderated to generate a thermal or epithermal source for BNCT with very little contamination of energetic form energetic neutron and gamma. Since the approval of MUNES project (in 2012) the high technology issues related to a compact neutron source to be installed in an Hospital environment have been faced. In particular for the powering of the accelerating structure an innovative system, completely based on solid state amplifiers, has been developed and ordered to industry. An outline of MUNES design and the status of the project will be given in the paper.

TUPP093	The Couplers for the IFMIF-EVEDA RFQ High Power Test Stand at LNL: Design, Construction and Operation	643
	E. Fagotti, L. Antoniazzi, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri, A. Pisent, C. R. Roncolato INFN/LNL, Legnaro (PD), Italy
	In order to assess the critical aspects of the IFMIF-EVEDA RFQ construction procedure and operation, it was decided to perform a High Power Test of a subset of the RFQ consisting in its last 550 mm three modules (out of 18) plus a Prototype Module, 390 mm long, used as RF plug. These modules are going to be tested at full power in CW of INFN LNL Labs, in the so-called RFQ High Power Test Stand. For such a purpose, a RF tube-based amplifier capable of 220 kW CW output power at the operational frequency of 175 MHz was purchased from an Italian company. A critical component of this test is the RF power coupler. Therefore INFN-LNL developed a design of two identical water-cooled loop antenna couplers, built with OFE copper and vacuum sealed with a commercially available 6”1/8 Alumina planar window. These couplers were tested separately on an aluminium coupling cavity. In particular one of them acts as a power feeder, while the other one, connected with a 200 kW water-cooled load, acts as a receiver. In this paper, the main aspects of the design, construction and tests performed on the couplers and coupling cavity will be described.

Paper

Title

Page

Construction of the Modules of the IFMIF-EVEDA RFQ

257

A. Pepato, E. Fagotti, F. Grespan, A. Palmieri, A. Pisent, C. R. Roncolato
INFN/LNL, Legnaro (PD), Italy
R. Dima, L. Ferrari, E. Udup
INFN- Sez. di Padova, Padova, Italy
A. Margotti
INFN-Bologna, Bologna, Italy
P. Mereu
INFN-Torino, Torino, Italy

The IFMIF project aims to produce an intense neutron flux to test and qualify materials suitable for the construction of fusion power plants. We are working on the engineering validation phase of the project, which consists on the construction of a linear accelerator prototype to be installed and commissioned in Rokkasho. The RFQ is composed of 18 modules flanged together for a total length of 9.8m designed to accelerate the 125mA D⁺ beam to 5MeV at a frequency of 175MHz. The mechanical specifications are very challenging, tight tolerances are required on the machining and on the brazing process. The line is subdivided into 3 Super Modules of 6 modules each. The production of the High Energy portion has been completed and delivered, while the Low Energy one is performing the acceptance test. They were commissioned to external firms. The production of the Intermediate Energy portion has been done in house (INFN) and will be commissioned soon. The 1st modules (16, 17 and 2) were produced adopting 2 brazing steps, while for all the remaining ones we adopted a single brazing step. In this paper the production status and the development of the brazing procedure will be described.

MOPP088

MUNES a Compact Neutron Source for BNCT and Radioactive Wastes Characterization

261

A. Pisent, P. Colautti, E. Fagotti
INFN/LNL, Legnaro (PD), Italy

At INFN LNL (Legnaro Italy) it has been built a high intensity Radio Frequency Quadrupole (RFQ) structure, able to produce a 5 MeV proton beam of 30 mA. Coupled with a Be target such a beam can generate a neutron flux of 10¹⁴ n/s, with a spectrum centered in the MeV region (that has been recently characterized in detail at LNL accelerators). This neutron flux can be moderated to generate a thermal or epithermal source for BNCT with very little contamination of energetic form energetic neutron and gamma. Since the approval of MUNES project (in 2012) the high technology issues related to a compact neutron source to be installed in an Hospital environment have been faced. In particular for the powering of the accelerating structure an innovative system, completely based on solid state amplifiers, has been developed and ordered to industry. An outline of MUNES design and the status of the project will be given in the paper.

TUPP093

The Couplers for the IFMIF-EVEDA RFQ High Power Test Stand at LNL: Design, Construction and Operation

643

E. Fagotti, L. Antoniazzi, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri, A. Pisent, C. R. Roncolato
INFN/LNL, Legnaro (PD), Italy

In order to assess the critical aspects of the IFMIF-EVEDA RFQ construction procedure and operation, it was decided to perform a High Power Test of a subset of the RFQ consisting in its last 550 mm three modules (out of 18) plus a Prototype Module, 390 mm long, used as RF plug. These modules are going to be tested at full power in CW of INFN LNL Labs, in the so-called RFQ High Power Test Stand. For such a purpose, a RF tube-based amplifier capable of 220 kW CW output power at the operational frequency of 175 MHz was purchased from an Italian company. A critical component of this test is the RF power coupler. Therefore INFN-LNL developed a design of two identical water-cooled loop antenna couplers, built with OFE copper and vacuum sealed with a commercially available 6”1/8 Alumina planar window. These couplers were tested separately on an aluminium coupling cavity. In particular one of them acts as a power feeder, while the other one, connected with a 200 kW water-cooled load, acts as a receiver. In this paper, the main aspects of the design, construction and tests performed on the couplers and coupling cavity will be described.