Isolated Bucket RF Systems in the Fermilab Antiproton Facility

Griffin, James E.; Ankenbrandt, C.; MacLachlan, J.; Moretti, A.

doi:10.1109/tns.1983.4336705

Cited by 44 publications

(25 citation statements)

References 3 publications

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“…The employment of barrier-bucket [108] rf cavities can effectively generate and manipulate a gap in the beam and reduce the space-charge effect. A successful test of this scheme has recently been completed [109], and two 40 kV barrier cavities have been built by BNL and KEK and are being installed on the AGS.…”

Section: Agsmentioning

confidence: 99%

Status of muon collider research and development and future plans

Ankenbrandt¹,

Ataç²,

Autin³

et al. 1999

Phys. Rev. ST Accel. Beams

291

190

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The status of the research on muon colliders is discussed and plans are outlined for future theoretical and experimental studies. Besides work on the parameters of a 3-4 and 0.5 TeV center-of-mass (COM) energy collider, many studies are now concentrating on a machine near 0.1 TeV (COM) that could be a factory for the s-channel production of Higgs particles. We discuss the research on the various components in such muon colliders, starting from the proton accelerator needed to generate pions from 1098-4402͞99͞2(8)͞081001(73)$15.00 © 1999 The American Physical Society 081001-1 PRST-AB 2 CHARLES M. ANKENBRANDT et al. 081001 (1999) a heavy-Z target and proceeding through the phase rotation and decay (p ! m n m ) channel, muon cooling, acceleration, storage in a collider ring, and the collider detector. We also present theoretical and experimental R&D plans for the next several years that should lead to a better understanding of the design and feasibility issues for all of the components. This report is an update of the progress on the research and development since the feasibility study of muon colliders presented at the Snowmass '96

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Section: Agsmentioning

confidence: 99%

Status of muon collider research and development and future plans

Ankenbrandt¹,

Ataç²,

Autin³

et al. 1999

Phys. Rev. ST Accel. Beams

291

190

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“…It makes use of two isolated rf buckets to control the width of this gap. Isolated bucket cavities, also called Barrier Bucket cavities, have been used elsewhere [2]. However, for this stacking scheme, a much higher rf voltage would be needed.…”

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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“…For example, in a second-harmonic rf system, B f could be about 0.5. In another way, a barrier bucket (BB) scheme [1][2][3], B f could become almost 1 by using a flat potential. This would also enable the accumulation of more bunches than the harmonic number of the ring, and may increase the number of injections up to the limitation of the momentum acceptance.…”

Section: Introductionmentioning

confidence: 99%

Barrier bucket experiment at the AGS

Fujieda

Iwashita

Noda

et al. 1999

Phys. Rev. ST Accel. Beams

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A barrier bucket experiment with two dedicated barrier cavities was performed at the Brookhaven AGS. One of the barrier cavities was a magnetic alloy (MA) -loaded cavity and the other was a ferriteloaded cavity. They generated a single sine wave with a peak voltage of 40 kV at a repetition rate of 351 kHz. A barrier rf system was established with these cavities and five bunches from the AGS booster were accumulated. A total of 3 3 10 13 protons were stored without beam loss, and were successfully rebunched and accelerated. The longitudinal emittance growth was observed during accumulation by the barrier bucket, the blowup factor of which was about 3. The longitudinal mismatch between the rf bucket and the beam bunch was the main reason for the emittance growth. The potential distortions by beam loading of the ferrite cavity and the overshooting voltage of the MA cavity disturbed the smooth debunching.

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Isolated Bucket RF Systems in the Fermilab Antiproton Facility

Cited by 44 publications

References 3 publications

Status of muon collider research and development and future plans

Status of muon collider research and development and future plans

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

Barrier bucket experiment at the AGS

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