PAC2013 - List of Authors (Kutsaev, S.V.)

Paper

Title

Page

Upgrade of Argonne's CW SC Heavy Ion Accelerator

737

P.N. Ostroumov, A. Barcikowski, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.H. Kim, S.V. Kutsaev, R.C. Murphy, B. Mustapha, R.C. Pardo, D.R. Paskvan, T. Reid, S.I. Sharamentov, G.P. Zinkann
ANL, Argonne, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
The ATLAS National User Facility is world’s first CW superconducting linac and provides variety of ion beams for nuclear physics experiments for the past 30 years. The accelerator is being continuously upgraded to extend the scientific reach. A new normal conducting CW RFQ capable to provide total voltage up to 2.1 MV for the heaviest uranium ions has been added in the front of the SC linac in order to increase efficiency and intensity of both stable and radioactive ion beams. The RFQ has been fully integrated into the ATLAS and it is routinely operated since January 2013. A new cryomodule of high-performance 72.75 MHz SC QWRs has been built and currently it is being commissioned off-line. New design and fabrication techniques have been applied for production of QWRs which resulted to new record voltages up to 4-5 MV per cavity and low residual resistance of 2-3 nOhm at 2K as was demonstrated in individual cold testing of several QWRs. Primary purpose of the new cryomodule is to increase intensity of accelerated stable ion beams. Beam commissioning will take place at the end of year after substantial modification of the booster area including radiation shielding.

Slides WEOAB2 [7.221 MB]

WEPMA05

RF Design Optimization of a 176 MHz CW RFQ

990

B. Mustapha, S.V. Kutsaev, P.N. Ostroumov
ANL, Argonne, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357 and ANL WFO No. 85Y47.
We have recently designed a 176 MHz CW RFQ for the SARAF upgrade project. A full 3D model of the structure including vane modulation was developed. The design was heavily optimized using large scale electromagnetic simulations. Following the choice of the vane type and geometry, the shape and dimensions of the undercuts were optimized to produce a flat field along the structure. Simulations of the same structure with different lengths were performed to verify that the design length produced the best separation of the operating mode from neighbouring modes. If built as designed the RFQ should not need dipole rods for mode separation, but their effect were studied in the case of manufacturing errors. Finally, the tuners were designed and optimized to tune the main mode without affecting the field flatness. The design optimization was mainly performed using CST Micro-Wave Studio and the results were verified using both HFSS and ANSYS. The results of these studies will be presented and discussed.

Paper	Title	Page
WEOAB2	Upgrade of Argonne's CW SC Heavy Ion Accelerator	737
	P.N. Ostroumov, A. Barcikowski, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.H. Kim, S.V. Kutsaev, R.C. Murphy, B. Mustapha, R.C. Pardo, D.R. Paskvan, T. Reid, S.I. Sharamentov, G.P. Zinkann ANL, Argonne, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. The ATLAS National User Facility is world’s first CW superconducting linac and provides variety of ion beams for nuclear physics experiments for the past 30 years. The accelerator is being continuously upgraded to extend the scientific reach. A new normal conducting CW RFQ capable to provide total voltage up to 2.1 MV for the heaviest uranium ions has been added in the front of the SC linac in order to increase efficiency and intensity of both stable and radioactive ion beams. The RFQ has been fully integrated into the ATLAS and it is routinely operated since January 2013. A new cryomodule of high-performance 72.75 MHz SC QWRs has been built and currently it is being commissioned off-line. New design and fabrication techniques have been applied for production of QWRs which resulted to new record voltages up to 4-5 MV per cavity and low residual resistance of 2-3 nOhm at 2K as was demonstrated in individual cold testing of several QWRs. Primary purpose of the new cryomodule is to increase intensity of accelerated stable ion beams. Beam commissioning will take place at the end of year after substantial modification of the booster area including radiation shielding.
	Slides WEOAB2 [7.221 MB]

WEPMA05	RF Design Optimization of a 176 MHz CW RFQ	990
	B. Mustapha, S.V. Kutsaev, P.N. Ostroumov ANL, Argonne, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357 and ANL WFO No. 85Y47. We have recently designed a 176 MHz CW RFQ for the SARAF upgrade project. A full 3D model of the structure including vane modulation was developed. The design was heavily optimized using large scale electromagnetic simulations. Following the choice of the vane type and geometry, the shape and dimensions of the undercuts were optimized to produce a flat field along the structure. Simulations of the same structure with different lengths were performed to verify that the design length produced the best separation of the operating mode from neighbouring modes. If built as designed the RFQ should not need dipole rods for mode separation, but their effect were studied in the case of manufacturing errors. Finally, the tuners were designed and optimized to tune the main mode without affecting the field flatness. The design optimization was mainly performed using CST Micro-Wave Studio and the results were verified using both HFSS and ANSYS. The results of these studies will be presented and discussed.