PAC2013 - List of Authors (Read, M.E.)

Paper	Title	Page
WEPHO08	200 kW CW, 350 MHz Multiple Beam Inductive Output Tube	946
	L.R. Ives, G. Collins, R. Karimov, D. Marsden, M.E. Read CCR, San Mateo, California, USA E.L. Eisen, T. Kimura CPI, Palo Alto, California, USA
	Funding: This development is funded by a grant from the U.S. Department of Energy with additional funding from communications & Power Industries, Inc and the Naval Surface Weapons Center. Calabazas Creek Research, Inc., in collaboration with Communications & Power Industries, Inc., is completing assembly of a 200 kW CW, 350 MHz, multiple beam inductive output tube (MBIOT). Seven production IOT guns in a circular pattern are driven by a coaxial input cavity. The beams drive a fundamental mode cavity with the power coupled through a coaxial window on the axis and passing through a coaxial collector. The RF input power enters through a coaxial waveguide on the electron gun end of the IOT. The principle challenge is driving all seven electron guns with same RF power and phase. The MBIOT is designed to operate at 22 kV with a total beam current of approximately 13 A. Simulations predict an output power of 210 kW with an efficiency of 71%, 23 dB gain and 4 MW bandwidth. Initial testing is scheduled for fall 2013 and will be performed at the Naval Surface Weapons Center, followed by delivery and final testing at the Advanced Photon Source (APS) at Argonne National Laboratory. The device will be evaluated as a potential replacement for the klystrons now driving the APS. This presentation will describe the design and fabrication. Any test results will also be presented.

WEPHO09	10 MW, L-Band, Annular Beam Klystron for Accelerator Applications	948
	M.E. Read, G. Collins, P. Ferguson, L.R. Ives, R.H. Jackson, D. Marsden CCR, San Mateo, California, USA
	Funding: US Department of Energy SBIR contract DE-SC0006213. Calabazas Creek Research Inc. (CCR) is developing an Annular Beam Klystron (ABK) for advanced accelerators. The power and frequency, 10 MW and 1.3 GHz, respectively, are consistent with requirements for the International Linear Collider (ILC), but the primary goal of the program is to demonstrate the feasibility of the configuration. The ABK uses a large diameter annular beam propagated close to the drift tube wall to reduce the plasma density, allowing high efficiency with high beam perveance. This allows the voltage to be less than 120 kV, as required for the ILC. The perveance is similar to that of multiple beam klystrons, but the ABK, with a single beam, is much simpler and is expected to be less expensive than the MBK. The CCR ABK has a calculated efficiency of 67% with a perveance of 3.4. The pulse width and pulse repetition frequency are 1.5 ms and 10 pps, respectively. The ABK has been modeled extensively using multiple codes, including KLSC, TESLA and MAGIC. The mechanical design is complete and assembly of the tube is expected by the fall of 2013. Test results will be reported, as available. Use of the concept for other accelerator requirements will also be discussed.

WEPMA09	PPM Klystrons for Accelerator Systems	999
	P. Ferguson, L.R. Ives, D. Marsden, M.E. Read CCR, San Mateo, California, USA J.E. Clayton Varian Medical Systems, Oncology Systems, Palo Alto, USA
	Funding: Department of Energy Office of Science SBIR Grant No. DE-SC0007591 Calabazas Creek Research, Inc. is developing a pulsed 5 MW S-band Periodic Permanent Magnet (PPM) klystron capable of replacing the solenoid focused 5 MW Klystron currently in production for medical accelerators. The most important improvement is the large reduction in space required for the current solenoid - solenoid power supply -klystron. The PPM klystron will require a substantially reduced volume while maintaining the current operating parameters. The initial development effort will be focused on determining the maximum electron beam perveance allowable with PPM focusing. The determination of this parameter will dictate the electron beam-interaction circuit and the required electron gun - collector design. Detailed parameters, simulation and fabrication results will be presented.

Paper

Title

Page

200 kW CW, 350 MHz Multiple Beam Inductive Output Tube

946

L.R. Ives, G. Collins, R. Karimov, D. Marsden, M.E. Read
CCR, San Mateo, California, USA
E.L. Eisen, T. Kimura
CPI, Palo Alto, California, USA

Funding: This development is funded by a grant from the U.S. Department of Energy with additional funding from communications & Power Industries, Inc and the Naval Surface Weapons Center.
Calabazas Creek Research, Inc., in collaboration with Communications & Power Industries, Inc., is completing assembly of a 200 kW CW, 350 MHz, multiple beam inductive output tube (MBIOT). Seven production IOT guns in a circular pattern are driven by a coaxial input cavity. The beams drive a fundamental mode cavity with the power coupled through a coaxial window on the axis and passing through a coaxial collector. The RF input power enters through a coaxial waveguide on the electron gun end of the IOT. The principle challenge is driving all seven electron guns with same RF power and phase. The MBIOT is designed to operate at 22 kV with a total beam current of approximately 13 A. Simulations predict an output power of 210 kW with an efficiency of 71%, 23 dB gain and 4 MW bandwidth. Initial testing is scheduled for fall 2013 and will be performed at the Naval Surface Weapons Center, followed by delivery and final testing at the Advanced Photon Source (APS) at Argonne National Laboratory. The device will be evaluated as a potential replacement for the klystrons now driving the APS. This presentation will describe the design and fabrication. Any test results will also be presented.

WEPHO09

10 MW, L-Band, Annular Beam Klystron for Accelerator Applications

948

M.E. Read, G. Collins, P. Ferguson, L.R. Ives, R.H. Jackson, D. Marsden
CCR, San Mateo, California, USA

Funding: US Department of Energy SBIR contract DE-SC0006213.
Calabazas Creek Research Inc. (CCR) is developing an Annular Beam Klystron (ABK) for advanced accelerators. The power and frequency, 10 MW and 1.3 GHz, respectively, are consistent with requirements for the International Linear Collider (ILC), but the primary goal of the program is to demonstrate the feasibility of the configuration. The ABK uses a large diameter annular beam propagated close to the drift tube wall to reduce the plasma density, allowing high efficiency with high beam perveance. This allows the voltage to be less than 120 kV, as required for the ILC. The perveance is similar to that of multiple beam klystrons, but the ABK, with a single beam, is much simpler and is expected to be less expensive than the MBK. The CCR ABK has a calculated efficiency of 67% with a perveance of 3.4. The pulse width and pulse repetition frequency are 1.5 ms and 10 pps, respectively. The ABK has been modeled extensively using multiple codes, including KLSC, TESLA and MAGIC. The mechanical design is complete and assembly of the tube is expected by the fall of 2013. Test results will be reported, as available. Use of the concept for other accelerator requirements will also be discussed.

WEPMA09

PPM Klystrons for Accelerator Systems

999

P. Ferguson, L.R. Ives, D. Marsden, M.E. Read
CCR, San Mateo, California, USA
J.E. Clayton
Varian Medical Systems, Oncology Systems, Palo Alto, USA

Funding: Department of Energy Office of Science SBIR Grant No. DE-SC0007591
Calabazas Creek Research, Inc. is developing a pulsed 5 MW S-band Periodic Permanent Magnet (PPM) klystron capable of replacing the solenoid focused 5 MW Klystron currently in production for medical accelerators. The most important improvement is the large reduction in space required for the current solenoid - solenoid power supply -klystron. The PPM klystron will require a substantially reduced volume while maintaining the current operating parameters. The initial development effort will be focused on determining the maximum electron beam perveance allowable with PPM focusing. The determination of this parameter will dictate the electron beam-interaction circuit and the required electron gun - collector design. Detailed parameters, simulation and fabrication results will be presented.