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Title: The BRAN luminosity detectors for the LHC

Authors:
; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1417096
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 848; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-01-16 12:55:12; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Matis, H. S., Placidi, M., Ratti, A., Turner, W. C., Bravin, E., and Miyamoto, R.. The BRAN luminosity detectors for the LHC. Netherlands: N. p., 2017. Web. doi:10.1016/j.nima.2016.12.019.
Matis, H. S., Placidi, M., Ratti, A., Turner, W. C., Bravin, E., & Miyamoto, R.. The BRAN luminosity detectors for the LHC. Netherlands. doi:10.1016/j.nima.2016.12.019.
Matis, H. S., Placidi, M., Ratti, A., Turner, W. C., Bravin, E., and Miyamoto, R.. Wed . "The BRAN luminosity detectors for the LHC". Netherlands. doi:10.1016/j.nima.2016.12.019.
@article{osti_1417096,
title = {The BRAN luminosity detectors for the LHC},
author = {Matis, H. S. and Placidi, M. and Ratti, A. and Turner, W. C. and Bravin, E. and Miyamoto, R.},
abstractNote = {},
doi = {10.1016/j.nima.2016.12.019},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 848,
place = {Netherlands},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nima.2016.12.019

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  • The BRAN (Beam RAte of Neutrals) detector monitors the collision rates in the high luminosity interaction regions of LHC (ATLAS and CMS). This Argon gas ionization detector measures the forward neutral particles from collisions at the interaction point. To predict and improve the understanding of the detector's performance, we produced a detailed model of the detector and its surroundings in Fluka. In this paper, we present the model and results of our simulations including the detectors estimated response to interactions for beam energies of 3.5, 5, and 7 TeV.
  • The effects of oat-bran and wheat-bran fibers on serum iron (SI), total iron binding capacity (TIBC), hemoglobin (Hg), and hematocrit (Hct) were studied in 12 adult males during a 35 day metabolic study. One week was an adjustment period. Subjects were then divided into two groups. Group 1 was fed oat-bran and group 2 was fed wheat-bran in addition to the basal diets for 2 weeks. In a second period, oat and wheat-bran were reduced to half and fed the subjects for another 2 weeks. Fasting venous blood was drawn in vacutainers for a total of 6 drawings. Serum wasmore » used to determine SI and TIBC. Hg and Hct were measured in whole blood. No significant differences on Hg and Hct were observed. SI was decreased 11.9% in oat-bran group and 32.1% in wheat-bran group from initial value during high bran period. When brans were reduced, SI values increased in both groups (38.5% in oat group and 7.8% in wheat group). TIBC values in oat groups increased slightly during the high bran period, but the increase was higher (30.0%) during the low bran period. Similar trends were shown in wheat-bran group. The percent of saturation was decreased 12.2% in oat and 34.0% in wheat groups during the high bran period. When brans were reduced to half, the percent of saturation increased 6.5% in oat group and -7.1% in wheat group. The percent saturation appeared to have a greater influence on wheat-bran than oat-bran group.« less
  • In 2023, the LHC luminosity will be increased, aiming at reaching 3000 fb-1 integrated over ten years. To obtain this target, new Nb 3Sn low-╬▓ quadrupoles (MQXF) have been designed for the interaction regions. These magnets present a very large aperture (150 mm, to be compared with the 70 mm of the present NbTi quadrupoles) and a very large stored energy density (120 MJ/m 3). For these reasons, quench protection is one of the most challenging aspects of the design of these magnets. In fact, protection studies of a previous design showed that the simulated hot spot temperature was verymore » close to the maximum allowed limit of 350 K; this challenge motivated improvements in the current discharge modeling, taking into account the so-called dynamic effects on the apparent magnet inductance. Moreover, quench heaters design has been studied to be going into more details. In this study, a protection study of the updated MQXF is presented, benefiting from the experience gained by studying the previous design. As a result, a study of the voltages between turns in the magnet is also presented during both normal operation and most important failure scenarios.« less