Operational aspects of the main injector large aperture quadrupole (WQB)

Chou, W.; Bartelson, L.; Brown, Bruce; Capista, D.; Crisp, J.; DiMarco, J.; Fitzgerald, James A.; Glass, H.; Harding, David J.; Johnson, D.E.; Kashikhin, V.V.; Kourbanis, I.; Prieto, P.; Robotham, W.; Sager, Thomas J.; Tartaglia, M.; Valerio, L.; Webber, R.; Wendt, M.; Wolff, Daniel; Yang, Ming-Jen

doi:10.1109/pac.2007.4440864

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…The circulating and transferring beams must share the quadrupole aperture, thus placing the circulating beam at large displacement. By developing a set of wide aperture quadrupoles (WQB [31,32]) with aperture larger by 7/4 = 1.32, improved physical aperture and much improved magnetic field quality is available for both beams. Fig.…”

Section: A Wide Aperture Quadrupolementioning

confidence: 99%

Fermilab main injector: High intensity operation and beam loss control

Brown

Adamson

Capista

et al. 2013

Phys. Rev. ST Accel. Beams

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From 2005 through 2012, the Fermilab Main Injector provided intense beams of 120 GeV protons to produce neutrino beams and antiprotons. Hardware improvements in conjunction with improved diagnostics allowed the system to reach sustained operation at 400 kW beam power. Transmission was very high except for beam lost at or near the 8 GeV injection energy where 95% beam transmission results in about 1.5 kW of beam loss. By minimizing and localizing loss, residual radiation levels fell while beam power was doubled. Lost beam was directed to either the collimation system or to the beam abort. Critical apertures were increased while improved instrumentation allowed optimal use of available apertures. We will summarize the improvements required to achieve high intensity, the impact of various loss control tools and the status and trends in residual radiation in the Main Injector.

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Section: A Wide Aperture Quadrupolementioning

confidence: 99%

Fermilab main injector: High intensity operation and beam loss control

Brown

Adamson

Capista

et al. 2013

Phys. Rev. ST Accel. Beams

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“…Indeed, as reported in Reference [5], the beam circulated immediately and once the closed orbits were adjusted to take advantage of the increased aperture the losses were reduced substantially.…”

Section: Discussionmentioning

confidence: 88%

A wide aperture quadrupole for the Fermilab main injector synchrotron

Harding

Bartelson

Brown

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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During the design of the Fermilab Main Injector synchrotron it was recognized that the aperture was limited at the beam transfer and extraction points by the combination of the Lambertson magnets and the reused Main Ring quadrupoles located between the Lambertsons. Increased intensity demands on the Main Injector from antiproton production for the collider program, slow spill to the meson fixed target program, and high intensity beam to the high energy neutrino program have led us to replace the aperture-limiting quadrupoles with newly built magnets that have the same physical length but a larger aperture. The magnets run on the main quadrupole bus, and must therefore have the same excitation profile as the magnets they replaced. We present here the design of the magnets, their magnetic performance, and the accelerator performance.

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“…Two types of orbit measurements were carried out to verify the BPM accuracy and estimate the lattice perturbation by WQBs, one using 3-bump method, another 1-bump method. The calculation of closed orbit deviation (COD) of the two methods is well known [2]. The results show a good agreement between the calculation and measurement.…”

Section: Orbit Measurementmentioning

confidence: 80%

“…This paper gives a brief report of the operation and performance of these magnets. Details can be found in Ref [2].…”

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confidence: 99%