Temperature considerations in the design of a permanent magnet storage ring

Bertsche, Kirk; Ostiguy, J.‐F.; Foster, W.

doi:10.1109/pac.1995.505908

Cited by 17 publications

(10 citation statements)

References 1 publication

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“…Our corresponding solutions are: (a) use passive temperature compensators (a binary Ni-Fe alloy) as Fermilab implemented in their antiproton Recycler [109], to stabilize the magnetic fields and gradients during ambient temperature drifts; (b) design correction coils, mounted in space between the magnet and the vacuum chambers, powered by small current supplies, to adjust the orbit positions and field gradients. For every magnet we plan to provide a steering correction coil (either vertical or horizontal) and a correction coil for field gradient adjustments.…”

Section: Permanent Magnet Designmentioning

confidence: 99%

eRHIC Design Study: An Electron-Ion Collider at BNL

Aschenauer¹,

Baker²,

Bazilevsky³

et al. 2014

Preprint

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Section: Permanent Magnet Designmentioning

confidence: 99%

eRHIC Design Study: An Electron-Ion Collider at BNL

Aschenauer¹,

Baker²,

Bazilevsky³

et al. 2014

Preprint

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“…3, this overhead time could be completely avoided. Such a ring could be build rather inexpensively possibly using low field permanent magnets [5]. Fig.…”

Section: Possible Future Ags Intensity Upgradesmentioning

confidence: 99%

AGS performance and upgrades a possible proton driver for a muon collider

Roser¹

1996

AIP Conference Proceedings

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After the successfull completion of the AGS Booster and several upgrades of the AGS, a new intensity record of 6.3 x 1013 protons per pulse accelerated to 24GeV was achieved. Futher intensity upgrades are being discussed that could increase the average delivered beam intensity by up to a factor of six. The total beam power then reaches almost 1 M W and the AGS can then be considered as a proton driver for a muon collider. Recent AGS High Intensity PerformanceThe proton beam intensity in the AGS has increased steadily over the 35 year existence of the AGS, but the most dramatic increase occurred over the last few years with the addition of the new AGS Booster [l]. In Fig. 1 the history of the AGS intensity improvements is shown and the major upgrades are indicated.The AGS Booster has one quarter the circumference of the AGS and therefore .allows four Booster beam pulses to be stacked in the AGS at an injection energy of 1.5 GeV. At this energy space charge forces are much reduced and . this in turn allowed for the dramatic increase in the AGS beam intensity.The beam intensity in the Booster surpassed the design goal of 1.5 x 1013 protons per pulse already to reach a peak value of 2.2 x 1013 protons per pulse. This was achieved by very carefully correcting all the important nonlinear orbit resonances especially at the injection energy of 200MeV, where the space charge tune shift reaches about 0.4, and also by using the extra set of rf cavities, that were installed for heavy ion operation, as a second harmonic rf system. A second harmo&c system allows for the creation of a flattened rf bucket which gives longer bunches with lower space charge forces.The AGS itself also had to be upgraded to be able to cope with the higher beam intensity. During beam injection from the Booster, the AGS needs to store the already transferred beam bunches. During this time the beam is Work performed under the auspices of the U.S. Department of Energy

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“…Using temperature-compensating steels as parallel flux shunts can essentially eliminate this effect. This method has been used for APS NdFeB dipoles [4] to achieve ∆B/B≈ 2x10 -5 /deg-C. Fermilab has also studied temperature compensation for low field ferrites [5]. For NLC quads a 9 mm thick flux shunt gives a temperature independent pole tip field that is calculated to be 4% weaker.…”

Section: Passive Temperature Compensationmentioning

confidence: 99%