Optics Measurements, Corrections and Modeling for High-Performance Storage Rings

Session

Experience from colliders, high energy and intensity machines - I

20 Jun 2011, 10:45

6/2-024 - BE Auditorium Meyrin (CERN)

Conveners

Experience from colliders, high energy and intensity machines - I

• Oliver Bruning (CERN)

Description

1. Achieved measurement resolution
2. Achieved optics quality (initial starting point and final achievement)
3. Major breakthroughs

15. RHIC Experience

Mei Bai (BNL)

20/06/2011, 10:50

The optics measurement of RHIC polarized protons at 250 GeV with squeezed beta* at IP6 and IP8 showed as large as +-40% horizontal beta beat in the sector between IP6 and IP8. This is a concern for further reducing beta* in RHIC to increase luminosity. Inspired by the success of LHC optics correction, RHIC has the Sector-by-Sector Technique(SBST) installed during 2011 RHIC polarized proton...

16. Tevatron Experience

Mr Valeri Lebedev (FNAL)

20/06/2011, 11:10

The talk will present the experience accumulated in the course of Tevatron Run II on the optics correction and improvement. Both the transfer lines and circular machines are discussed. This work minimized the emittance growth related to ring-to-ring transfers to the level acceptable for collider operation. It also resulted in an acceptance increse required to boost the antiproton production...

17. LHC Experience

Glenn Vanbavinckhove (Technische Universiteit Delft)

20/06/2011, 11:30

Since the LHC start-up in 2009, numerous optics measurement and correction campaigns were conducted at various energies of the LHC energy cycle. Meticulous local optics corrections for each interaction region, subsequently followed by global corrections enabled to reach a record low beta-beating for hadron colliders below 10% during the squeeze sequence from beta* of 10m to 1.5m. The accurate...

25. KEKB Experience

Yukiyoshi Ohnishi (KEK)

20/06/2011, 11:50

We present optics measurements and corrections in the KEKB commissioning. Beta functions, dispersions, X-Y coupling corrections have been applied to achieve higher luminosity. In addition to the linear optics, chromatic behaviours have been measured and corrected. Chromatic X-Y coupling correction by using skew sextupole magnets helps to increase luminosity by about 20% than before the correction.

26. PEPII Experience

Dr Yiton Yan (SLAC)

20/06/2011, 12:10

Starting from brief review of driving modified betatron oscillation to show that resonance driving leads to non-modified betatron oscillation, we will review how we made measurement, modeling, and correction of the PEP-II low-energy ring and high-energy ring optics for improving luminosity. We will emphasize on that matching essentially unlimited number of Green’s functions had very much...