Inter-University Accelerator Centre (IUAC)
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IUAC Technical Visit

Rutherford Backscattering Spectrometry system installed in IUAC, is used by users from various Institutes/Universities/colleges. The facility is used to measure composition of samples, thickness of thin films, for diffusion studies and ion beam  induced damages in various systems. On an average 1500 measurements are performed with RBS facility.
Carbon AMS facility, extended to measure radio-isotopes of beryllium and aluminium. The measurements of ratios of radio-isotopes to stable isotopes provides information related to archaeology, geology, environmental sciences, hydrology etc.  

RBS facility

AMS facility


National Array of Neutron Detectors (NAND) is one of the major nuclear physics research facility built for the study of heavy ion collision experiments. The array measure the distribution and time of flight of neutrons emitted during the nuclear reaction process. Neutron energy measured in coincidence with fission fragments can provide information on the dynamics and time scale involved in the nuclear reaction. The detector array consists of 100 neutron detectors (made of liquid scintillators) mounted on a Geo-dome structure at 175 cm flight path. A 100cm diameter spherical vacuum chamber at the center of the array houses the targets and charged particle detectors. The liquid scintillators are sensitive to both gamma rays and neutrons and their separation is achieved by pulse shape discrimination technique using electronics method.



HYbrid Recoil mass Analyzer (HYRA) is a dual mode, dual stage recoil separator with its first stage capable of operating in gas-filled mode in normal kinematics (to access heavy nuclei around 200 amu mass and beyond) and both stages in vacuum mode in inverse kinematics (to access nuclei around N ~ Z up to 100 amu mass and to provide light, secondary beams produced in direct reactions). This one-of-its-kind device is commissioned in beam hall II, downstream of the superconducting linear accelerator, at IUAC.


SRF Infrastructure

The SRF Infrastructure at Inter-University Accelerator Centre was commissioned in the year 2002 for constructing superconducting niobium cavities indigenously. Four major facilities were setup: (1) Electron Beam Welding (EBW), (2) Surface Preparation Laboratory (SPL), (3) High Vacuum Furnace (HVF) and (4) Test Cryostat.

The EBW is a 15 KW, 60 KV, 250 mA welder with a vacuum chamber of size 1 m x 1 m x 2.5 m size. The entire welding operation can be programmed through CNC which operates in conjunction with a PC and touch screen system. The SPL is essentially a facility to electropolish niobium cavities. The HVF is a resistive heating type vacuum furnace that can go up to 1300 C. It is pumped by an oil free turbomolecular pump. The entire heating cycle, monitoring and data collection is done through a PC based SCADA system. The hot zone is 600 mm diameter and 1000 mm long. A cylindrical getter chamber is used in the HVF for annealing the niobium cavities. The test cryostat facility is used for testing the niobium cavities at 4.2 K. The cryostat is provided with both radiation and magnetic shielding (<10 mG). In order to cut the external radiation level, the cryostat is partly buried in the ground.


Superconducting LINAC

The superconducting linear accelerator at IUAC acts as a booster to accelerated heavy ion beam from the 15UD tandem accelerator. This linac booster having a superbubcher (SB) with a single quarter wave resonator (QWR), three accelerating modules each having 8 QWRs, and a rebuncher (RB) having 2 QWRs, has been delivering heavy ion beams starting from Carbon (12C6+) to Silver(107Ag21+) with time widths of few hundreds of  psec on the user  target as per the demand by various experimental groups. The accelerating gradients in the resonators obtained in the linac cryostat are in the range of 3 –5 MV/m at 6 watts dissipated power into liquid helium system at critically coupled condition of the power coupler. During last  linac run cycle for 3-4 months duration in 2015, the total energy gain from 22 accelerating modules of linac is 8.8 Mev/q.

Superconducting Cavities inside a LINAC cryomodule


               LINAC cryomodule                                          Inside View of LINAC cryomodule            

IUAC has developed cryogenic facilities for the Rf-superconducting LINAC. There are three large cryomodules in the LINAC to house twenty four accelerating cavities and three cavities in Buncher and Rebuncher cryostat. Each accelerating cryomodule houses eight superconducting cavities and one superconducting solenoid magnet. A helium refrigerator of 1kW at 4.2K is integrated with the cryomodules of the LINAC using liquid helium distribution network. The operating temperature of the superconducting cavities is 4.2K.

            4.2K Helium Refrigrator