Abstract

CERN's Large Hadron Collider (LHC) will be supplied with protons from the injector chain Linac2-PS Booster (PSB)-PS-SPS. The required transverse beam brilliance (intensity/emittance) is almost twice that of current PS beams and the LHC bunch spacing of 25 ns must be impressed on the beam before its transfer to the SPS. The scheme involves new RF harmonics in the PSB and the PS, an increase of the PSB energy, and two-batch filling of the PS. After a successful test of the main ingredients, a project for converting the PS complex was launched in 1994. Major additions are: (i) h=1 RF systems in the PSB, (ii) upgrading of the PSB main magnet supply from 1 to 1.4 GeV operation, (iii) new magnets, septa, power supplies, kicker pulsers for the PSB-PS beam transfer, (iv) 40 and 80 MHz systems in the PS, (v) beam profile measurement devices with improved resolution. A significant part of the effort is being provided by TRIUMF under the Canada-CERN co-operation agreement on the LHC.

Highlights

  • CERN’s Large Hadron Collider (LHC) [1][2] will be supplied with protons from the injector chain Linac2-PS Booster (PSB)-PS-SPS (Fig. 1)

  • The injector chain has to produce beams corresponding to the nominal performance; wherever possible, a higher performance level is aimed at, to potentially fill the LHC up to the beam-beam limit and to provide an operational margin

  • With a beam brilliance corresponding to the LHC beambeam limit, the space-charge tune shifts ('Q) are almost twice the present figures at the PSB (50 MeV) and PS (1 GeV) injection energies, leading to unacceptable beam blow-up and loss

Read more

Summary

Double-batch filling of the PS to reduce space charge in the PSB

The four PSB rings (each 1/4 of PS circumference) are transferred sequentially (3-4-2-1), to fill the PS in one pulse. With two PSB pulses to fill the PS, the intensity per PSB pulse is halved and 'Q reduced to 0.45

RF harmonic 1 in PSB for two-batch filling of the PS
New RF systems in PSB
Acceleration on new RF harmonics in the PS
Beam diagnostics
Major results obtained so far
Findings
STATUS OF THE “PS FOR LHC” PROJECT
Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.