160 MeV H- injection into the CERN PSB
The H- beam from the proposed LINAC4 will be injected into the four existing rings of the PS Booster at 160 MeV. A substantial upgrade of the injection region is required, including the modification of the beam distribution system and the construction of a new H- injection system. This paper discusses beam dynamics and hardware requirements and presents the results of optimisation studies of the injection process for different beam characteristics and scenarios. The resulting conceptual design of the injection region is presented, together with the main hardware modifications and performance specifications.
INJECTION PAINTING AND ASSOCIATED HW FOR 160 MeV PSB H
Linac4 will replacethe currentlyusedLinac2 in the LHC injector chain. The motivation is to increase the protonflux availability for the CERN accelerator complex and eventu- ally achieve the LHC ultimate luminosity goals. Linac4 will inject 160 MeV Hions in to the four existing rings of the PS Booster (PSB). A new charge-exchange multi turn injection scheme will be put into operation and re- quires a substantial upgrade of the injection region. Four kicker magnets (KSW) will be used to accomplish trans- verse phase space painting in order to match the injected beams to the requiredemittances. This paperpresentshard- ware issues and related beam dynamics studies for several painting schemes. Results of optimization studies of the injection process for different beam characteristic and sce- narios are discussed.
rPET detectors design and data processing
Small animal PET systems based on rotating planar detectors posses some interesting advantages for high sensitivity, high resolution imaging. We have designed the rPET detectors based on MLS crystals assembled on a 30times30 matrix optically coupled to a flat-panel PS-PMT. Weighted position readout circuits pre-process the 64 signals from the 8times8 anodes matrix, which are digitized using a charge-integrating converter. The amplification electronics, including the trigger output for coincidence detection, and the high voltage supply are integrated in a three PCBs stack that forms the base attached to the back of the PMT. The whole assembly is enclosed in a light tight, lead (Pb) shielded aluminum box. The detectors are mounted on a rotating gantry with more than 180 degrees rotation span. The digitized events are screened and histogramed, and a modified center of gravity algorithm removes from the position calculation those signals with poor signal to noise ratio. Apparent mean crystal size on the 511 keV field-flood images is 0.6 mm, mean peak-to-valley ratio is better than 8, and intrinsic resolution is 1.5 mm at the central row, with the energy window wide open. Sensitivity (CPS) for a pair of these detectors set in coincidence at 160 mm distance is 1%