Analysis of coupled-bunch instabilities for the NSLS-II storage ring with a 500MHz 7-cell PETRA-III cavity

Bassi, G.; Blednykh, A.; Cheng, W.; Gao, F.; Rose, J.; Teytelman, D.

doi:10.1016/j.nima.2015.11.151

Title: Analysis of coupled-bunch instabilities for the NSLS-II storage ring with a 500MHz 7-cell PETRA-III cavity

Full Record
Other Related Research

Abstract

We present the NSLS-II storage ring that is designed to operate with superconducting RF-cavities with the aim to store an average current of 500 mA distributed in 1080 bunches, with a gap in the uniform filling for ion clearing. At the early stage of the commissioning (phase 1), characterized by a bare lattice without damping wigglers and without Landau cavities, a normal conducting 7-cell PETRA-III RF-cavity structure has been installed with the goal to store an average current of 25 mA. In this paper we discuss our analysis of coupled-bunch instabilities driven by the Higher Order Modes (HOMs) of the 7-cell PETRA-III RF-cavity. As a cure of the instabilities, we apply a well-known scheme based on a proper detuning of the HOMs frequencies based upon cavity temperature change, and the use of the beneficial effect of the slow head–tail damping at positive chromaticity to increase the transverse coupled-bunch instability thresholds. In addition, we discuss measurements of coupled-bunch instabilities observed during the phase 1 commissioning of the NSLS-II storage ring. In our analysis we rely, in the longitudinal case, on the theory of coupled-bunch instability for uniform fillings, while in the transverse case we complement our studies with numerical simulations withmore »« less

Authors:

Bassi, G. ^[1]; Blednykh, A. ^[1]; Cheng, W. ^[1]; Gao, F. ^[1]; Rose, J. ^[1]; Teytelman, D. ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Dimtel, Inc, San Jose, CA (United States)

Publication Date:: Fri Dec 11 00:00:00 EST 2015

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1341524

Alternate Identifier(s):: OSTI ID: 1359627

Report Number(s):: BNL-112273-2016-JA
Journal ID: ISSN 0168-9002

Grant/Contract Number:: SC00112704; AC02-98CH10886

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

Additional Journal Information:: Journal Volume: 810; Journal ID: ISSN 0168-9002

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 43 PARTICLE ACCELERATORS; coupled-bunch; instability; HOMs; Head-tail; NSLS-II

Citation Formats


                    Bassi, G., Blednykh, A., Cheng, W., Gao, F., Rose, J., and Teytelman, D. Analysis of coupled-bunch instabilities for the NSLS-II storage ring with a 500MHz 7-cell PETRA-III cavity.  United States: N. p., 2015. 
Web.  doi:10.1016/j.nima.2015.11.151.

Copy to clipboard


                    Bassi, G., Blednykh, A., Cheng, W., Gao, F., Rose, J., & Teytelman, D. Analysis of coupled-bunch instabilities for the NSLS-II storage ring with a 500MHz 7-cell PETRA-III cavity.  United States.  https://doi.org/10.1016/j.nima.2015.11.151

Copy to clipboard


                    Bassi, G., Blednykh, A., Cheng, W., Gao, F., Rose, J., and Teytelman, D. Fri .  
"Analysis of coupled-bunch instabilities for the NSLS-II storage ring with a 500MHz 7-cell PETRA-III cavity".  United States.  https://doi.org/10.1016/j.nima.2015.11.151.  https://www.osti.gov/servlets/purl/1341524.

Copy to clipboard


                    
@article{osti_1341524,

  title        = {Analysis of coupled-bunch instabilities for the NSLS-II storage ring with a 500MHz 7-cell PETRA-III cavity},

  author       = {Bassi, G. and Blednykh, A. and Cheng, W. and Gao, F. and Rose, J. and Teytelman, D.},

  abstractNote = {We present the NSLS-II storage ring that is designed to operate with superconducting RF-cavities with the aim to store an average current of 500 mA distributed in 1080 bunches, with a gap in the uniform filling for ion clearing. At the early stage of the commissioning (phase 1), characterized by a bare lattice without damping wigglers and without Landau cavities, a normal conducting 7-cell PETRA-III RF-cavity structure has been installed with the goal to store an average current of 25 mA. In this paper we discuss our analysis of coupled-bunch instabilities driven by the Higher Order Modes (HOMs) of the 7-cell PETRA-III RF-cavity. As a cure of the instabilities, we apply a well-known scheme based on a proper detuning of the HOMs frequencies based upon cavity temperature change, and the use of the beneficial effect of the slow head–tail damping at positive chromaticity to increase the transverse coupled-bunch instability thresholds. In addition, we discuss measurements of coupled-bunch instabilities observed during the phase 1 commissioning of the NSLS-II storage ring. In our analysis we rely, in the longitudinal case, on the theory of coupled-bunch instability for uniform fillings, while in the transverse case we complement our studies with numerical simulations with OASIS, a novel parallel particle tracking code for self-consistent simulations of collective effects driven by short and long-range wakefields.},

  doi          = {10.1016/j.nima.2015.11.151},

  journal      = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},

  number       = ,

  volume       = 810,

  place        = {United States},

  year         = {Fri Dec 11 00:00:00 EST 2015},

  month        = {Fri Dec 11 00:00:00 EST 2015}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (Publisher)

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1016/j.nima.2015.11.151

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 5 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Analysis of coupled-bunch instabilities for the NSLS-II storage ring with a 500MHz 7-cell PETRA-III cavity

Journal Article Bassi, G. ; Blednykh, A. ; Cheng, W. ; ... - Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

The NSLS-II storage ring is designed to operate with superconducting RF-cavities with the aim to store an average current of 500 mA distributed in 1080 bunches, with a gap in the uniform filling for ion clearing. At the early stage of the commissioning (phase 1), characterized by a bare lattice without damping wigglers and without Landau cavities, a normal conducting 7-cell PETRA-III RF-cavity structure has been installed with the goal to store an average current of 25 mA. In this paper we discuss our analysis of coupled-bunch instabilities driven by the Higher Order Modes (HOMs) of the 7-cell PETRA-III RF-cavity.more »« less
https://doi.org/10.1016/j.nima.2015.11.151
Analysis of Coupled Bunch Instabilities in the NSLS-II Storage Ring with a 7-cell PETRA-III RF Structure

Technical Report Bassi, Gabriele ; Blednykh, Alexei ; Krinsky, S.

We studied the coupled-bunch instability driven by a 7-cell PETRA-III cavity structure, which is considered to be installed in the commissioning Phase 1 in the NSLS-II storage ring at an average current of 25mA. For instability threshold calculations we used the parameters of the bare lattice (no DW’s and Landau cavities). The transverse and longitudinal coupled-bunch instabilities can be driven by the higher order modes (HOM’s) of the 7-cell PETRA-III cavity structure. In the case of uniform filling the beam is longitudinally stable, and transversely unstable at zero chromaticity. To increase the transverse instability threshold we studied the stabilizing effectmore »« less
https://doi.org/10.2172/1505122

Full Text Available
NSLS-II SR Commissioning Report

Technical Report Wang, Guimei ; Shaftan, Timur ; Willeke, Ferdinand ; ...

The NSLS-II storage ring (SR) phase I commissioning has been successfully completed in May 12, 2014. In accordance to the project milestone, 25 mA average current was achieved in the storage ring with PETRA III 500 MHz 7-cell PETRA-III RF cavity but w/o ID’s and Landau cavities. In about 5 weeks we delivered a 3 GeV beam to the ring injection straight section, made the 1st turn around the ring, achieved hundreds of turns optimizing injection, stored beam having sextupoles and RF turned ON. Injection efficiency was achieved 95%, close orbit rms value is ~100 um, tune and chromaticity weremore »« less
https://doi.org/10.2172/1505098

Full Text Available
Cure of Coupled Bunch Instabilities in PLS Storage Ring

Technical Report Fox, John D

The Pohang Light Source (PLS) storage ring whose design emittance is 12-nm uses four 500 MHz nosecone-structure rf cavities to store beam current up to 400-mA at 2-GeV. The stored beam current was limited to 180-mA at 2-GeV because of the coupled bunch instabilities (CBI) excited by higher order modes (HOMs) of rf cavity. In order to cure the CBIs three measures are incorporated: HOM frequency tuning by cavity temperature adjustment; a longitudinal feedback system (LFS); a transverse feedback system (TFS). Growth rate of longitudinal and transverse HOMs of all rf cavities as a function of cavity temperature was estimatedmore »« less
https://doi.org/10.2172/813011

Full Text Available
Instabilities related with RF cavity in the booster synchrotron for NSLS-II

Conference Kawashima, Y. ; Cupolo, J. ; Ma, H. ; ...

The booster synchrotron for NSLS-II accepts beam with 200 MeV from a linac and raises its energy up to 3 GeV. In order to raise beam energy up to 3 GeV, a 7-cell PETRA cavity is installed. Beam instabilities related to the cavity impedances are discussed. In particular, in order to avoid coupled-bunch instability, we consider that cooling water temperature for the cavity should be changed to shift frequencies of higher order modes (HOM) to avoid beam revolution lines. To obtain the relation between the temperature dependence of amount of frequency shift in each HOM and cavity body temperature, wemore »« less
Full Text Available

Similar Records