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PH-EP Technical Notes

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2019-07-30
15:42
Estimation of the Optical Aging Rate for 1.00 mm Plastic Scintillating Fibre of Type SCSF-78M / Shinji, O (Kuraray Co., Ltd.)
Natural aging, in absence of ionizing radiation, leads to a very slow decrease of the optical transparency in plastic scintillating fibres. This aging phenomenon is attributed to chemical reactions of the fibre core material polystyrene, which can be a photo-reaction by natural light or an oxidation reaction with oxygen diffused in from the surrounding atmosphere. [...]
EP-Tech-Note-2019-002.- Geneva : CERN, 2019 - 23 p. Fulltext: DOCX.PDF;

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2019-02-12
12:17
Oxygen Diffusion in a Polystyrene Optical Fibre Surrounded by an Oxygen Gas Barrier / Shinji, Osamu (Kuraray Co. Ltd.)
In the context of the LHCb SciFi project natural aging of the scintillating plastic fibres was observed. The observed loss of transparency of the fibre is attributed to an oxygenation reaction of polystyrene, the fibre core material. [...]
EP-Tech-Note-2019-001.- Geneva : CERN, 2019 - 14 p. Fulltext: PDF;

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2018-02-26
12:05
Elastic stability and HEP detectors: a primer / Wertelaers, P (CERN EP-DT)
Destabilizing -- or "buckling" -- phenomena can compromise the quality of a physics detector long before the point of collapse has been reached. We rehearse on the two types of buckling : snap-through versus bifurcation. [...]
EP-Tech-Note-2018-005.- Geneva : CERN, 2018 - 1 p. Fulltext: PDF;

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2018-02-23
15:35
Downward transfer of a sub-cooled cryoliquid / Wertelaers, P (CERN EP-DT)
An alternative is proposed to the traditional transfer of a cryo fluid in gaseous -- and warm -- form, a method of low productivity and high energy cost. In order to prevent the much-feared geysering, focus is on sub-cooling of the liquid, and the safe maintaining of such state all along the journey [...]
EP-Tech-Note-2018-004.- Geneva : CERN, 2016 - 19 p. Fulltext: PDF;

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2018-02-23
15:33
Anode wire in cylindrical cathode tube : destabilizing electrostatic force / Wertelaers, P (CERN EP-DT)
A two-dimensional -- cross-sectional -- discussion suffices. The tube is offset, and the electrostatic potential is found analytically with perturbative methods. [...]
EP-Tech-Note-2018-003.- Geneva : CERN, 2017 - 11 p. Fulltext: PDF;

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2018-02-23
15:31
Pipe regarded as bending beam : destabilizing transverse effect of internal pressure / Wertelaers, P (CERN EP-DT)
This confusing subject is of distinct importance in case of detectors based on straw tubes. The emphasis is on analytical expressions [...]
EP-Tech-Note-2018-002.- Geneva : CERN, 2009 - 7 p. Fulltext: PDF;

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2018-02-23
15:26
Simple-topology switched-mode DC-DC converters : dynamics and control / Wertelaers, P (CERN EP-DT)
After a rehearsal of the functioning mode and characteristics of the buck-boost and buck converters, we attempt to formalize a lower-frequency description of the converter, by smoothing the waveforms containing switching ripple. This framework enables the construction of a linear time-invariant computational model, to which voltage-regulating actions can then be added. [...]
EP-Tech-Note-2018-001.- Geneva : CERN, 2018 - 26 p. Fulltext: PDF;

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2015-05-05
11:04
Characterisation of a Sr-90 based electron monochromator / Arfaoui, S; CERN ; Joram, C; CERN ; Casella, C; ETH Zurich
This note describes the characterisation of an energy filtered Sr-90 source to be used in laboratory studies that require Minimum Ionising Particles (MIP) with a kinetic energy of up to approx. 2 MeV. [...]
PH-EP-Tech-Note-2015-003.- Geneva : CERN, 2015 - 26 p. Fulltext: PDF;

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2015-04-17
13:04
Studies of IBL wire bonds operation in a ATLAS-like magnetic field. / Alvarez Feito, D (CERN PH-DT) ; Honma, A (CERN PH-DT) ; Mandelli, B (CERN PH-DT and University of Oslo)
At the Large Hadron Collider (LHC) experiments, most of silicon detectors use wire bonds to connect front-end chips and sensors to circuit boards for the data and service trans- missions. These wire bonds are operated in strong magnetic field environments and if time varying currents pass through them with frequencies close to their mechanical resonance frequency, strong resonant oscillations may occur. [...]
PH-EP-Tech-Note-2015-002.- Geneva : CERN, 2015 - 12 p. Fulltext: PDF;

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2015-03-19
16:44
Review of input stages used in front end electronics for particle detectors / Kaplon, J (CERN) ; Kulis, S (CERN)
In this paper we present noise analysis of the input stages most commonly used in front end electronics for particle detectors. Analysis shows the calculation of the input referenced noise related to the active devices. [...]
PH-EP-Tech-Note-2015-001.- Geneva : CERN, 2015 - 18 p. Fulltext: PDF;

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