Experience with the low energy demonstration accelerator (LEDA) halo experiment beam instrumentation

A 52 quadrupole-magnet FODO lattice has been assembled and operated at the Los Alamos National Laboratory. The purpose of this lattice is to provide a platform to measure the resulting beam halo as the first four magnets of the lattice produce various mismatch conditions. These data are then compared with particle simulations so that halo formation mechanisms may be better understood. The lattice is appended to the LEDA 6.7-MeV radiofrequency quadrupole (RFQ) and is followed by a short high-energy beam transport (HEBT) that safely dumps the beam into a 670-kW beam stop. Beam diagnostic instruments are interspersed within the lattice and HEBT. The primary instruments for measuring the beam halo are nine interceptive devices that acquire the beam's horizontal and vertical projected particle density distributions out to an approximate 10/sup 5/:1 dynamic range. These distributions are acquired using both traditional wire scanners and water-cooled graphite scraping devices. The lattice and HEBT instrumentation set also includes position, bunched-beam current, pulsed current, and beam loss measurements. This paper briefly describes and details the operation of each instrument compares measured data from the different types of instruments, and refers to other detailed papers.

[1]  J. Gilpatrick,et al.  Experience with photomultiplier base beam loss monitors (PMBLM) at the Low Energy Demonstration Accelerator (LEDA) , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[2]  C. K. Allen,et al.  Measurements of halo generation for a proton beam in a FODO channel , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[3]  J. D. Gilpatrick,et al.  Analog front-end electronics for beam position measurement on the beam halo measurement , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[4]  D. Barr,et al.  Upgrade to initial BPM electronics module and beamline components for calibration of the LEDA beam position measurements , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[5]  D. Barr,et al.  Design and experience with the WS/HS assembly movement using LabVIEW VIs, National Instrument motion controllers, and compumotor electronic drive units and motors , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[6]  M.E. Gruchalla,et al.  Beam profile wire-scanner/halo-scraper sensor analog interface electronics , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[7]  T. Wright,et al.  The final mechanical design, fabrication, and commissioning of a wire scanner and scraper assembly for halo-formation measurements in a proton beam , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[8]  J. H. Kamperschroer,et al.  BEAM-PROFILE INSTRUMENTATION FOR BEAM-HALO MEASUREMENT : OVERALL DESCRIPTION, OPERATION, AND BEAM DATA. , 2001 .

[9]  J. O'Hara,et al.  Beam-profile instrumentation for beam-halo measurement: overall description and operation , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[10]  C. K. Allen,et al.  Experimental study of proton-beam halo induced by beam mismatch in LEDA , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[11]  J. Gilpatrick.  Beam Diagnostics Instrumentation for a 6.7-MeV Proton Beam Halo Experiment , 2000 .