113201344
Design of Machine Protection System for the PEFP 100MeV Linac
126282229
STATUS OF 100-MeV PROTON LINAC DEVELOPMENT FOR PEFP
185078083
THE KOMAC ACCELERATOR FACILITY
The development of the KOMAC (Korea multi-purpose accelerator complex) accelerator facility was finished and will go into the operation period from July 2013. The facility consists of a 100-MeV proton linac including a 50-keV ion source, a 3-MeV RFQ (radio-frequency quadrupole), and a 100-MeV DTL, and 20-MeV and 100MeV beam lines. The linac and beam lines were developed by the Proton Engineering Frontier Project (PEFP), the first phase of KOMAC, from 2002 to 2012 [1]. The goal of the beam commissioning is delivering 100-MeV 1-kW proton beams to a beam bump in a 100MeV target room. After finishing the commissioning, the user beam service will start from July 2013. The KOMAC user facility consists of 2 beam lines in the initial operation stage and it will be increased to 10 beam lines in future. One beam line is for 20-MeV proton beams which are extracted after 20-MeV part of the DTL tanks. A medium energy beam transport (MEBT) is installed there for the 20-MeV beam extraction and the beam matching to the next DTL tank. The other beam line is for 100-MeV proton beams. This work summarized the status of the KOMAC accelerator and beam lines. KOMAC 100-MeV PROTON LINAC The KOMAC accelerator building consists of 3 stories. The first floor includes the linac tunnel, and 20-MeV and 100-MeV beam line halls. There is a klystron gallery in the second floor. The third one is the modulator room. The accelerator building is shown in Figure 1. The main parameter of the linac is summarized in Table 1. Figure 1: Accelerator building which includes the linac and beam lines. The injector of the KOMAC accelerator consists of a microwave ion source [2] with the extraction energy of 50keV, and a low energy beam transport (LEBT) for matching proton beams into the RFQ. The ion source can work in cw (continuous wave) and pulsed modes. The peak beam current is 20 mA. Figure 2 shows the injecotr which was installed and tested in the tunnel. The 20-MeV part of the linac consists of a 3-MeV RFQ and a 20-MeV DTL (drift tube linac) [3]. The peak beam current and the maximum beam duty are respectively 20 mA and 24%. The RFQ is a four vane type with the resonant coupling and dipole rods for field stabilization. The DTL includes four tanks which are driven by a klystron. The FFDD lattice was adopted for the 20-MeV DTL with pool-type quadrupole magnets. Figure 3 is the 3-MeV RFQ which was tested in the linac tunnel. Table 1: Parameters of KOMAC Linac
125669672
OPERATION OF THE PEFP 20MEV PROTON LINAC AT KAERI
126044036
PRELIMINARY OPERATION OF THE BEAM LOSS MONITORING SYSTEM AT THE 100-MeV PROTON LINAC
125989328
INSTALLATION OF 100-MEV PROTON LINAC FOR PEFP
The Proton Engineering Frontier Project (PEFP) [1] at Korea Atomic Energy Research Institute (KAERI) is developing a 100-MeV proton linac in order to supply 20MeV and 100-MeV proton beams to users for proton beam application. The linac consists of a 50-keV injector, a 3-MeV radio frequency quadrupole (RFQ) and a 100MeV drift tube linac (DTL). The operation of the 20-MeV part of linac at Daejeon site was finished on November 2011. It was disassembled and moved to the Gyeongju site for installation as a low energy part of the linac. We completed the fabrication and test of the accelerating structures. The installation of the proton linac started in December 2011 at the new project site. The user service is scheduled for 2013 through the beam commissioning in 2012. This work summarized the installation status of the proton linac.
118481681
Thermal aspects of the ABJM theory: currents and condensations
To study thermal aspects of the ABJM theory in the strongly coupled regime, we carry out the invariant dimensional reduction of the type IIA supergravity down to four dimensions. We then investigate zero and finite temperature responses of the operators which are dual to the AdS scalar and vector fields. Two scalar operators are shown to have finite-temperature condensations by coupling of the constant source term. The currents dual to the massless and massive gauge fields are not induced by coupling of the constant boundary vector potential, which implies that the phase described by the black brane background is not superconducting. We also discuss a generalization to charged (dyonic) black holes.