Novel Tune Diagnostics for the Tevatron

Tan, Cheng‐Yang

doi:10.1109/pac.2005.1590383

Cited by 12 publications

(11 citation statements)

References 6 publications

(8 reference statements)

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“…By gating the signal from a strip-line, it was able to see antiprotons without beam excitation. However, it suffers from relatively strong 60 Hz lines that have also been observed at RHIC and SPS (in this case 50 Hz, due to the difference in mains frequency) [16].…”

Section: Figurementioning

confidence: 99%

Tevatron Instrumentation: Boosting Collider Performance

Shiltsev¹,

Jansson²,

Moore³

2006

AIP Conference Proceedings

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Abstract. The Tevatron in Collider Run II (2001-present) is operating with six times more bunches, many times higher beam intensities and luminosities than in Run I (1992Run I ( -1995. Beam diagnostics were crucial for the machine start-up and the never-ending luminosity upgrade campaign. We present the overall picture of the Tevatron diagnostics development for Run II, outline machine needs for new instrumentation, present several notable examples that led to Tevatron performance improvements, and discuss the lessons for the next big machines -LHC and ILC.

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Section: Figurementioning

confidence: 99%

Tevatron Instrumentation: Boosting Collider Performance

Shiltsev¹,

Jansson²,

Moore³

2006

AIP Conference Proceedings

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“…3.) At 150 GeV, separation is limited to ~ (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) mm by physical aperture, while the separation above 600 GeV, ~(3-6 mm), is limited by the breakdown (spark) rate of the separators at high voltage. Long-range beam effects degrade beam lifetime and machine performance, and having a good model of the optics is essential to understanding problems and how to improve operations.…”

Section: Upgrade Of Beam Position Monitorsmentioning

confidence: 99%

“…By gating the signal from a stripline, it was able to see antiprotons without beam excitation. However, it suffers from relatively strong 60 Hz lines that have also been observed at RHIC and SPS (in this case 50 Hz, due to the difference in mains frequency) [19].…”

mentioning

confidence: 99%

Beam instrumentation for the Tevatron collider

2009

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The Tevatron in Collider Run II (2001-present) is operating with six times more bunches and many times higher beam intensities and luminosities than in Run I (1992)(1993)(1994)(1995). Beam diagnostics were crucial for the machine start-up and the never-ending luminosity upgrade campaign. We present the overall picture of the Tevatron diagnostics development for Run II, outline machine needs for new instrumentation, present several notable examples that led to Tevatron performance improvements, and discuss the lessons for future colliders. FIGURE 2. a) (top) Evolution of beam losses (left axis) in 2002-2009.Red shows fractional loss of antiprotons between injection into the Tevatron and start of collisions, next (blue) one is for loss of protons, greenfractional reduction of the luminosity integral caused by beam-beam effects in collisions. b) (bottom) Injection process and beginning of the luminosity run in store #7040 (May 11, 2009). The square dots are the total proton and antiproton bunch intensities, respectively, as measured by the Fast Bunch Integrator (FBI) system. The line on the right represents the start of the HEP store with an initial peak luminosity of 321×10 30 cm -2 s -1 . The spikes in the beam intensities are instrumentation artifacts that occur when antiproton bunches pass through proton bunch integration gates during longitudinal cogging [1]. 4 BEAM DIAGNOSTICS DEVELOPMENTSOperation of a superconducting magnet hadron collider, like Fermilab's Tevatron, requires a great deal of care, understanding of beam conditions, and trust in the beam diagnostics, because comparatively innocent little imperfections can lead to either beam blow-up and luminosity loss or to beam loss and quench of SC magnets. In the Tevatron such a quench results in 2-4 hours of magnet recovery time and up to 8-16 hours of no-luminosity time needed to produce the antiprotons needed for the next High Energy Physics (HEP) store. Over 8 years of operations we witnessed machine downtimes due to 0.5-1% of beam intensity loss, poor beam lifetime, 0.5-1 mm orbit error, collimator malfunctioning, sequencer error, excursions of tunes or coupling of the order of few 0.001 or several units of chromaticity, instability occurrences, or malfunctioning of kickers, high voltage electrostatic separators, or one of hundreds of power supplies, etc. Naturally, these peculiarities were reflected in the kinds of beam diagnostics we developed (e.g. minimization of their invasiveness) and the way they were exploited (fast data-logging, convenience for post-mortem analysis, etc.).In the Tevatron, the protons and antiprotons circulate within a single beam pipe, so electrostatic separators are used to kick the beams onto distinct helical orbits to allow head-on collisions only at the desired interaction points. (See Fig. 3.) At 150 GeV, separation is limited to ~(10-22) mm by physical aperture, while the separation above 600 GeV, ~(3-6 mm), is limited by the breakdown (spark) rate of the separators at high voltage. Long-range beam effects degrade beam...

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“…On the other hand, for this method, we have to know the current in the AC dipole magnet accurately. Because the free oscillation tune is an important parameter of a synchrotron, we usually have other instruments to accurately measure the free oscillation tune[49]. If the free oscillation tune…”

mentioning

confidence: 99%

Diagnostics of the Fermilab Tevatron using an AC dipole

Miyamoto¹

2008

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Novel Tune Diagnostics for the Tevatron

Cited by 12 publications

References 6 publications

Tevatron Instrumentation: Boosting Collider Performance

Tevatron Instrumentation: Boosting Collider Performance

Beam instrumentation for the Tevatron collider

Diagnostics of the Fermilab Tevatron using an AC dipole

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