2011 Particle Accelerator Conference - List of Authors (Marroquin, P.S.)

Paper	Title	Page
TUP267	LANSCE Drift Tube Linac Water Control System Refurbishment	1319
	P.S. Marroquin, J.D. Bernardin, J.G. Gioia, J.A. Ortiz LANL, Los Alamos, New Mexico, USA
	Funding: Funding Agency: Work performed under the auspices of the U.S. Department of Energy, under contract DE-AC52-06NA25396. There are several refurbishment projects underway at the Los Alamos National Laboratory LANSCE linear accelerator. Systems involved are: RF, water cooling, networks, diagnostics, timing, controls, etc. The Drift Tube Linac (DTL) portion of the accelerator consists of four DTL tanks, each with three independent water control systems. The systems are about 40 years old, use outdated and non-replaceable equipment and NIM bin control modules, are beyond their design life and provide unstable temperature control. Insufficient instrumentation and documentation further complicate efforts at maintaining system performance. Detailed design of the replacement cooling systems is currently in progress. Previous design experience on the SNS accelerator water cooling systems will be leveraged. Plans call for replacement of water piping, manifolds, pumps, valves, mix tanks, instrumentation (flow, pressure and temperature) and control system hardware and software. This presentation will focus on the control system design with specific attention on planned use of the National Instruments Compact RIO platform with the Experimental Physics and Industrial Control System (EPICS) software toolkit.

THP202	First Operation of the LANL/AES Normal Conducting Radio Frequency Photoinjector	2498
	N.A. Moody, H.L. Andrews, G.O. Bolme, L.J. Castellano, C.E. Heath, F.L. Krawczyk, S. Kwon, D. C. Lizon, P.S. Marroquin, F.A. Martinez, D.C. Nguyen, M.S. Prokop, R.M. Renneke, W. Roybal, P.A. Torrez, W.M. Tuzel, T. Zaugg LANL, Los Alamos, New Mexico, USA L. Roybal TechSource, Santa Fe, New Mexico, USA
	Funding: We gratefully acknowledge funding from the Office of Naval Research (ONR) and the High Energy Laser Joint Technology Office (HEL-JTO). The LANL/AES normal-conducting radio-frequency (NCRF) injector has undergone high power testing, confirming field gradients of up to 10 MV/m at the cathode. Most NCRF designs are limited to low-duty-factor operation to constrain rf power consumption and limit ohmic heat generation. This cavity structure utilizes high density micro-channel cooling to successfully remove heat with the option of dynamic temperature control to actively adjust cavity resonance. This first high power rf test demonstrated stable cw (100% duty cycle) operation using resonant frequency tracking and produced intentional dark current emission from a roughened cathode blank. Resulting end-point x-ray measurements confirm the cathode gradient of 9.8 ± 0.2 MV/m required for acceleration of nC bunches to a beam energy of 2.5 MeV.

Paper

Title

Page

LANSCE Drift Tube Linac Water Control System Refurbishment

1319

P.S. Marroquin, J.D. Bernardin, J.G. Gioia, J.A. Ortiz
LANL, Los Alamos, New Mexico, USA

Funding: Funding Agency: Work performed under the auspices of the U.S. Department of Energy, under contract DE-AC52-06NA25396.
There are several refurbishment projects underway at the Los Alamos National Laboratory LANSCE linear accelerator. Systems involved are: RF, water cooling, networks, diagnostics, timing, controls, etc. The Drift Tube Linac (DTL) portion of the accelerator consists of four DTL tanks, each with three independent water control systems. The systems are about 40 years old, use outdated and non-replaceable equipment and NIM bin control modules, are beyond their design life and provide unstable temperature control. Insufficient instrumentation and documentation further complicate efforts at maintaining system performance. Detailed design of the replacement cooling systems is currently in progress. Previous design experience on the SNS accelerator water cooling systems will be leveraged. Plans call for replacement of water piping, manifolds, pumps, valves, mix tanks, instrumentation (flow, pressure and temperature) and control system hardware and software. This presentation will focus on the control system design with specific attention on planned use of the National Instruments Compact RIO platform with the Experimental Physics and Industrial Control System (EPICS) software toolkit.

THP202

First Operation of the LANL/AES Normal Conducting Radio Frequency Photoinjector

2498

N.A. Moody, H.L. Andrews, G.O. Bolme, L.J. Castellano, C.E. Heath, F.L. Krawczyk, S. Kwon, D. C. Lizon, P.S. Marroquin, F.A. Martinez, D.C. Nguyen, M.S. Prokop, R.M. Renneke, W. Roybal, P.A. Torrez, W.M. Tuzel, T. Zaugg
LANL, Los Alamos, New Mexico, USA
L. Roybal
TechSource, Santa Fe, New Mexico, USA

Funding: We gratefully acknowledge funding from the Office of Naval Research (ONR) and the High Energy Laser Joint Technology Office (HEL-JTO).
The LANL/AES normal-conducting radio-frequency (NCRF) injector has undergone high power testing, confirming field gradients of up to 10 MV/m at the cathode. Most NCRF designs are limited to low-duty-factor operation to constrain rf power consumption and limit ohmic heat generation. This cavity structure utilizes high density micro-channel cooling to successfully remove heat with the option of dynamic temperature control to actively adjust cavity resonance. This first high power rf test demonstrated stable cw (100% duty cycle) operation using resonant frequency tracking and produced intentional dark current emission from a roughened cathode blank. Resulting end-point x-ray measurements confirm the cathode gradient of 9.8 ± 0.2 MV/m required for acceleration of nC bunches to a beam energy of 2.5 MeV.