Upgrade of LAMPF´s 750-keV, H+ transport

The results of the upgrade to the 750 keV H/sup +/ transport at LAMPF (Los Alamos Meson Physics Facility) are reported. The transport takes the beam from the exit of the 750 kV column to the entrance of the 201 MHz drift tube linear accelerator (LINAC). Components of the transport are used to bunch the beam, to match the beam to the LINAC, and to adjust the peak current of the beam. The transport is a critical section of LAMPF´s accelerator system; a properly tuned and stable beam significantly reduces high-energy losses in the accelerator. The transport was upgraded to decrease the emittance growth of the beam, to facilitate tuning, and to eliminate the time-dependent transients associated with space-charge neutralization of the beam. The new transport was installed and used for beam operations in 1990. The upgrade design goals were achieved. The unnormalized emittance for 95% of the beam was measured at 0.8 pi cm-mrad, compared with 1.2 pi cm-mrad in the previous transport.<>