The “Roman pot” spectrometer and the vertex detector of experiment UA4 at the CERN SPS collider

Battiston, R.; Bechini, A.; Bosi, F.; Bozzo, M.; Braccini, P. L.; Buskens, J.; Carbonara, F.; Carrara, R.; Castaldi, R.; Cazzola, U.; Cervelli, F.; Chiefari, G.; Drago, E.; Gorini, R.; Haguenauer, M.; Koene, B.; Maleyran, R.; Manna, F.; Matthiae, G.; Merola, L.; Morelli, Alessandro; Napolitano, M.; Palladino, V.; Rewiersma, P.; Robert, M.; Roiron, G.; Sanguinetti, G.; Schuijlenburg, H.; Sciacca, G.; Sette, G.; Swol, R. van; Timmermans, J.; Traspedini, L.; Vannini, C.; Velasco, J.; Visco, Fran

doi:10.1016/0168-9002(85)91024-1

Cited by 27 publications

(3 citation statements)

References 11 publications

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“…The UA4 experiment [16], in their measurements of elastic and diffractive scattering [17,18], used similar pot installations in LSS4, but without a pot upstream of the first quadrupole magnets. With this first measuring station, our installation yielded acceptance for leading protons and antiprotons with x p as small as 0.70.…”

Section: Roman-pot Spectrometersmentioning

confidence: 99%

Measurements of single diffraction at √s = 630 GeV; Evidence for a non-linear α(t) of the pomeron

et al. 1998

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We report measurements of the inclusive differential cross section for the singlediffractive reactions: p i +p → p f + X and p +p i → X +p f at √ s = 630 GeV, in the momentum transfer range, 0.8 < −t < 2.0 GeV 2 and final state Feynmanx p > 0.90. Based on the assumption of factorization, several new features of the Pomeron Flux Factor are determined from simultaneous fits to our UA8 data and lower energy data from the CHLM collaboration at the CERN-Intersecting Storage Rings.Prominent among these is that the effective Pomeron Regge trajectory requires a term quadratic in t, with coefficient, α ′′ = 0.079±0.012 GeV −4 . We also show that the data require a Pomeron-proton cross section that first decreases with increasing diffractive mass (corresponding to the PPR term in the triple-Regge expansion) and then increases at larger mass (the PPP term), similar to real particle total cross sections. We measure the product, Kσ 0 = 0.72 ± 0.10 mb GeV −2 , where K is the normalization constant of the Pomeron Flux Factor in the proton and σ 0 is the scale constant in the Pomeron-proton total cross section. Finally, we report the occurence of "beam jets" in the Pomeron direction in the rest frame of the diffractive system.

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Section: Roman-pot Spectrometersmentioning

confidence: 99%

Measurements of single diffraction at √s = 630 GeV; Evidence for a non-linear α(t) of the pomeron

et al. 1998

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“…On the machine side, special optics with high β * are used to obtain at the interaction points beams with small angular beam divergence, and on the detector side special movable "Roman Pot" detectors are used to record the scattered particles very close to the beam. These techniques were pioneered at the ISR and used at hadron colliders like the SppS and TEVATRON proton-antiproton colliders [1,2]. Optics with high β * ≈ 4000 m were also considered for the SSC [3].…”

Section: Introduction and Short Historymentioning

confidence: 99%

High-Beta Optics and Running Prospects

Burkhardt

2019

Instruments

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Dedicated high-beta optics are used to make forward proton scattering measurements possible at the LHC. Following a short general introduction and history of special high-beta optics and running conditions, we describe the two types of special high-beta runs planned for 2018. A run at top energy at β y * = 90 m for elastic and diffractive scattering, and a low energy run to measure the rho-parameter in the Coulomb interference region.

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“…The U-shaped frame of the chamber allowed the sensitive region of the chamber to approach the beams to within a few mm. An improved pot with a flat bottom plate was used for this experiment [48].…”

Section: Giorgio Matthiaementioning

confidence: 99%