J-PARC加速器セミナー The CERN Proton Synchrotron at the Heart of the Accelerator / The Recycler and Main Injector in the PIP-II Era

概要

1. Speaker: Dr. Heiko Damerau (CERN)
   　Title: The CERN Proton Synchrotron at the Heart of the Accelerator
   Complex Abstract The CERN Proton Synchrotron (PS) accelerates high-intensity proton beams to a momentum of 26 GeV/c, as well as a number of ion species. First commissioned in 1959, it surpassed its original design intensity by orders of magnitude. Besides being the link between PS Booster and the Super Proton Synchrotron (SPS) in the injector chain of the Large Hadron Collider (LHC), it supplies several experimental facilities: two fixed target xperimental zones, the so-called EAST areaand the nTOF facility.
   The PS also provides the primary protons for the beam in the antiproton decelerator (AD). Most destinations require dedicated longitudinal beam parameters, from coasting beam to short bunches with 25 ns spacing.
   Evolved RF manipulations are performed using a multitude of RF systems in the frequency range from 400 kHz to 200 MHz. With the LHC Injector Upgrade (LIU) Project, a major improvement programme prepares the PS for its future role as a pre-injector of the High-Luminosity LHC (HL-LHC).
   The presentation will summarize the features of this synchrotron at the heart of the complex at CERN.

2. Speaker: Dr. Robert Ainsworth　(FNAL)
   　Title: The Recycler and Main Injector in the PIP-II Era
   Abstract: As part of the Nova upgrades in 2012, the Recycler was repurposed as a proton stacker for the Main Injector with the aim to deliver 700 kW. Since January 2017, this design power has been run routinely. The steps taken to commission the Recycler and run at 700 kW operationally while keeping losses under control will be discussed.
   Looking towards PIP-II, the Recycler and Main Injector will be required to stack and accelerate 50% more beam in order to deliver 1.2 MW beam power for LBNF/DUNE. This intensity increase poses serious challenges of which some will be discussed, such as space charge tune shifts during slip-stacking, transition crossing in the Main Injector and instabilities caused by electron cloud. Different schemes to mitigate these issues, such as resonance compensation and a gamma-t jump system will be discussed.