TRANSFER LINES TO AND FROM PS2

Within the scope of the LHC injector upgrade, it is proposed to replace the present injector chain by new accelerators, Linac4, SPL and PS2, for which new beam transfer lines are required. The beam properties and requirements for each of the lines are summarized. The original design of the beam lines has been fully reconsidered due to the very demanding constraints on the beam line layouts at the PS2 injection / extraction regions and a new straight section of the PS2 which led to a much improved beam line geometry. The relevant modifications and optics designs are described. INTRODUCTION The planned LHC luminosity upgrade requires reliable high-intensity beams which are limited by the present injector chain. To overcome these limitations it has been proposed by the study group on Proton Accelerators for the Future (PAF) to upgrade the injector chain [1]. Within this upgrade plan it is proposed to replace the present injectors LINAC2, PS Booster and PS by new linear H accelerators LINAC4 [2] and SPL [3] and by a new 50 GeV proton synchrotron (PS2 [4]). Important system upgrades are also required for the SPS. In addition to their main purpose – the increase of the beam availability and intensity for the LHC – they should allow their use as drivers for future experimental facilities like e.g. a new neutrino factory. Therefore, a low power (LP-SPL) and a high power (HP-SPL) version of the SPL are under study for PS2 and future facilities, respectively. To connect the PS2 to the different injectors, several new transfer lines are required, whose preliminary designs will be presented in this paper. BEAM TRANSFER SYSTEMS For PS2 numerous systems for injection and extraction, beam dumping and beam transfer are required, which result in the following transfer lines with their preliminary names given in brackets: • SPL-to-PS2 transfer line (TTL1) for multi-turn H injection into PS2 using a stripping foil or laser stripping at 4 GeV. • PS/LEIR-to-PS2 transfer line (TT10) for fast singleturn injection of 1.3 GeV ions or protons for PS2 commissioning. • PS2-to-SPS transfer line (TT11) for fast single-turn and low loss 5-turns extractions of protons and ions at 20-50 GeV for SPS. • Beam line from PS2 to a new experimental area (TTEA) for a slow extracted proton beam. This beam line will also transport fast extracted beams to an external beam dump. • Short beam line from the PS2 injection region to the injection beam dump for unstripped and partially stripped H/H waste beams (TD1). The overall layout of PS2 and its transfer lines resulting from these studies is shown in Fig. 1. Figure 1: Layout of PS2 and its transfer lines. The dashed line represents the proposed location for the new TT10 transfer line which is currently under study. REQUIREMENTS Beam Properties The beam parameters of the different beams to and from PS2 are listed in Tab. 1 and 2. Table 1: Parameters of the Beams Injected into the PS2