The IPNS second harmonic RF upgrade

Middendorf, Mark; Brumwell, F.; Dooling, J. C.; Horan, D.; Kustom, R.L.; Lien, M.K.; McMichael, G.E.; Moser, Mark; Nassiri, A.; Wang, S.

doi:10.1109/pac.2007.4441207

Cited by 4 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where r p is the classical radius of the proton, n t is the bunch population, is the transverse emittance, and β and γ are the relativistic factors. To decrease the space charge tune shift, increasing the bunching factor by using a dual harmonic rf system is a common method in high intensity proton synchrotrons [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of a dual harmonic system and its application to the CSNS/RCS

Yao-Shuo¹,

Wang²,

Shou³

et al. 2015

Chinese Phys. C

View full text Add to dashboard Cite

The dual harmonic system has been widely used in high intensity proton synchrotrons to suppress the space charge effect, as well as reduce the beam loss. To investigate the longitudinal beam dynamics in the dual rf system, the potential well, the sub-buckets in the bunch and the multi-solutions of the phase equation have been studied theoretically. Based on these theoretical studis, the optimization of bunching factor and rf voltage waveform are made for the dual harmonic rf system in the upgrade phase of the CSNS/RCS. In the optimization process, the simulation with space charge effect is done by using a newly developed code C-SCSIM.

show abstract

Section: Introductionmentioning

confidence: 99%

Theoretical study of a dual harmonic system and its application to the CSNS/RCS

Yao-Shuo¹,

Wang²,

Shou³

et al. 2015

Chinese Phys. C

View full text Add to dashboard Cite

show abstract

“…1. There have been other proton synchrotrons in the world applying dual-harmonic RF system to improve the control on beam bunch shape; for example, the PS booster at CERN [3], the AGS booster at BNL [4] and the RCS at ANL [5]. At ISIS, the 2nd highest harmonic cavities were installed and the initial operation shows that the beam loss rate becomes dramatically smaller [6].…”

Section: Introductionmentioning

confidence: 99%

Studies of dual-harmonic acceleration at CSNS- II

陈锦芳

唐靖宇

2010

Chinese Phys. C

View full text Add to dashboard Cite

The Rapid Cycling Synchrotron RCS) of the China Spallation Neutron Source (CSNS) complex is designed to provide 1.56×1013 protons per pulse (ppp) during the initial stage, and it is upgradeable to 3.12×1013 ppp during the second stage and 6.24×1013 ppp during the ultimate stage. The high beam intensity in the RCS requires alleviation of space charge effects to reduce beam losses, which is key in such high beam power accelerators. With higher intensities in the upgrading phases, a dual-harmonic RF system is planned to produce flat-topped bunches that are useful to reduce the space charge effects. We have studied different schemes to apply the dual-harmonic acceleration in CSNS- II, and have calculated the main parameters of the RF systems, which are presented in this paper.

show abstract

“…The two rf cavities (harmonic number 1) are located on opposite sides of the ring and accelerate the proton beam from 50 MeV to 450 MeV while the rf frequency varies from 2.21 MHz to 5.14 MHz in about 14 ms. A third rf cavity has recently been added to provide second-harmonic rf over the first 4 ms of the acceleration period [2]. Currently, the RCS runs with a current of ∼15 μA.…”

Section: Introductionmentioning

confidence: 99%

Vertical instability at IPNS RCS

Wang

Brumwell

Dooling

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

Self Cite

View full text Add to dashboard Cite

The Rapid Cycling Synchrotron (RCS) of the Intense Pulsed Neutron Source (IPNS) at ANL accelerates > 3.0 × 10 12 protons from 50 MeV to 450 MeV with 30-Hz repetition frequency. During the acceleration cycle, the rf frequency varies from 2.21 MHz to 5.14 MHz. Presently, the beam current is limited by a vertical instability. By analyzing turn-by-turn beam position monitor (BPM) data, largeamplitude mode 0 and mode 1 vertical beam centroid oscillations were observed in the later part of the acceleration cycle. The oscillations start in the tail of the bunch, build up, and remain localized in the tail half of the bunch. This vertical instability was compared with a head-tail instability that was intentionally induced in the RCS by adjusting the trim sextupoles. It appears that our vertical instability is not a classical head-tail instability [1]. More data analysis and experiments were performed to characterize the instability.

show abstract

The IPNS second harmonic RF upgrade

Cited by 4 publications

References 5 publications

Theoretical study of a dual harmonic system and its application to the CSNS/RCS

Theoretical study of a dual harmonic system and its application to the CSNS/RCS

Studies of dual-harmonic acceleration at CSNS- II

Vertical instability at IPNS RCS

Contact Info

Product

Resources

About