Tests of large Čerenkov detectors with silica aerogel as radiator

Bénot, M.; Carlson, P.; Tavernier, S.; Bogaert, F. Van Den; Henri, Victor; Herquet, P.; Kesteman, J.; Pingot, O.; Johansson, K. E.; Norrby, J.; Lagnaux, Jean-Pierre

doi:10.1016/0029-554x(78)90407-x

Cited by 32 publications

(3 citation statements)

References 9 publications

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“…Reflectivity of the Millipore paper for λ ≥ 315 nm is taken from [15]. Below 315 nm it is linearly extrapolated to 50% at λ = 190 nm.…”

Section: A Details On the Monte Carlo Simulation Of The Detectormentioning

confidence: 99%

“…The baseline design for this optimization assumed a 110×100×24.5 cm 3 detector box covered from the inside with a diffuse reflector of at least 96% reflectivity, and with 5-inch diameter PMTs of 20% quantum efficiency mounted on each long side of the diffusion box. This design concept follows earlier proven aerogel detector designs [15][16][17]. Since the photon detection probability is directly proportional to the fraction of the inner detector surface covered by the photo-cathode windows of the PMTs [13,14], the mechanically allowable maximum number of seven PMTs on each side was assumed in these studies.…”

Section: Design Overviewmentioning

confidence: 99%

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The Aerogel Čerenkov detector for the SHMS magnetic spectrometer in Hall C at Jefferson Lab

Horn

Mkrtchyan

Ali

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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Hadronic reactions producing strange quarks such as the exclusive p(e, e ′ K + )Λ and p(e, e ′ K + )Σ 0 reactions, or the semi-inclusive p(e, e ′ K + )X reaction, play an important role in studies of hadron structure and the dynamics that bind the most basic elements of nuclear physics. The small-angle capability of the new Super High Momentum Spectrometer (SHMS) in Hall C, coupled with its high momentum reach -up to the anticipated 11-GeV beam energy in Hall C -and coincidence capability with the well-understood High Momentum Spectrometer (HMS), will allow for probes of such hadron structure involving strangeness down to the smallest distance scales to date. To cleanly select the kaons, a threshold aerogel Cerenkov detector has been constructed for the SHMS. The detector consists of an aerogel tray followed by a diffusion box. Four trays for aerogel of nominal refractive indices of n=1.030, 1.020, 1.015 and 1.011 were constructed. The tray combination will allow for identification of kaons from 1 GeV/c up to 7.2 GeV/c, reaching ∼ 10 −2 proton and 10 −3 pion rejection, with kaon detection efficiency better than 95%. The diffusion box of the detector is equipped with 14 five-inch diameter photomultiplier tubes. Its interior walls are covered with Gore diffusive reflector, which is superior to the commonly used Millipore paper and improved the detector performance by 35%. The inner surface of the two aerogel trays with higher refractive index is covered with Millipore paper, however, those two trays with lower aerogel refractive index are again covered with Gore diffusive reflector for higher performance. The measured mean number of photoelectrons in saturation is ∼12 for n=1.030, ∼8 for n=1.020, ∼10 for n=1.015, and ∼5.5 for n=1.011. The design details, the results of component characterization, and initial performance tests and optimization of the detector are presented.

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“…Reflectivity of the Millipore paper for λ ≥ 315 nm is taken from [15]. Below 315 nm it is linearly extrapolated to 50% at λ = 190 nm.…”

Section: A Details On the Monte Carlo Simulation Of The Detectormentioning

confidence: 99%

Section: Design Overviewmentioning

confidence: 99%

The Aerogel Čerenkov detector for the SHMS magnetic spectrometer in Hall C at Jefferson Lab

Horn

Mkrtchyan

Ali

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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“…3.3.3). We used two types of -450 nm region and it is commonly used in industry as a filter membrane [71]. The Millipore paper was attached with double-sided tape to all internal walls in each segment, except the aerogel surface and the round holes for the PMTs (Fig.…”

Section: Experimental Requirements and Expectationsmentioning

confidence: 99%

Spectroscopy of electroproduced light to medium mass lambda hypernuclei

Baturin

2010

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The E01-011 experiment at Jefferson Laboratory (JLab) studied light-to-medium mass Λ Until recently, hypernuclei were studied at accelerator facilities with intense π + and K -meson beams. The poor quality of these beams limited the resolution of the hypernuclear excitation energy spectra to about 1.5 MeV (FWHM). This resolution is not sufficient for resolving the rich structure observed in the excitation spectra. By using a high quality electron beam and employing a new high resolution spectrometer system, this study aims to improve the resolution to a few hundred keV with an absolute precision of about 100 keV for excitation energies. hypernuclei via the ( 1)AIn this work the high-resolution excitation spectra of In conclusion, the discrepancies found in this study will provide valuable input for the further development of theoretical models.v

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Aerogel in High Energy Physics

Poelz¹

1986

Springer Proceedings in Physics

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Tests of large Čerenkov detectors with silica aerogel as radiator

Cited by 32 publications

References 9 publications

The Aerogel Čerenkov detector for the SHMS magnetic spectrometer in Hall C at Jefferson Lab

The Aerogel Čerenkov detector for the SHMS magnetic spectrometer in Hall C at Jefferson Lab

Spectroscopy of electroproduced light to medium mass lambda hypernuclei

Aerogel in High Energy Physics

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