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

Session

Techniques review - II

21 Jun 2011, 10:50

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

Conveners

Techniques review - II

• Catia Milardi (INFN - LNF)

Description

1. Merits of the different techniques
2. Do the available techniques match the future challenges?
3. Beta* leveling, blind optimization of non-linear correction

48. Refined techniques for phase measurements

Nicolo Biancacci (Universita di Roma I 'La Sapienza'-Universita e INFN, Roma I)

21/06/2011, 10:55

Extracting the phase from signals in beam position monitors is a common operation in accelerator facilities and can be used to reconstruct many optics parameters as well as the impedance distribution in the machine. The main limit in these operations is set by the accuracy of the phase measurement. On this topic we will present a recently developed algorithm, named all-phase FFT (apFFT), which...

49. Beta* measurement and adjustment

Dr Valeri Lebedev (FNAL)

21/06/2011, 11:10

Good understanding of Tevatron optics was absolutely essential to maximize the Tevatron luminosity and performance. The talk discusses optics measurements used to build the Tevatron optics model and steps which were required to correct optics. A comparison of optics measurements with the orbit responce and the turn-by-turn measurements is also discussed.

67. Probing non-linear fields with orbit bumps

Angelina Parfenova (GSI)

21/06/2011, 11:30

The nonlinear tune response matrix (NTRM) method was developed to diagnose the lattice nonlinear components. It explores a nonlinear tune response to a controlled closed orbit deformation (COD). The details and challenges of the experimental application of the NTRM method are discussed. Status of experimental reconstruction of controlled sextupolar errors and natural sextupolar components...

59. Chromatic measurements in RHIC and LHC

Rama Calaga (BNL)

21/06/2011, 11:50

In RHIC, the phase advance between the two interaction points is optimized for an initial design beta*. This may not hold true as RHIC presently operates with a considerably reduced beta*. Chromatic optics measurements from RHIC are presented the enlarged beating is evident for reduced beta*. Phase advance changes between the IPs are proposed as a first attempt to reduce the model chromatic...

58. RHIC non-linear chromaticity and IR corrections

Dr Yun Luo

21/06/2011, 12:10

In this talk we will review the measurement, modeling and correction of second order chromaticities, the interaction region multipole errors, and the third order resonance driving term in RHIC. We will focus on second order chromaticity modeling and correction. With a low beta* at IP6 and IP8, the second order chromaticities have to be corrected for successful RF re-bucketing and good...