The COMPASS RICH-1 detector has undergone a major upgrade in 2016 with the installation of four novel MPGD-based photon detectors. They consist of large-size hybrid MPGDs with multi-layer ...architecture composed of two layers of Thick-GEMs and bulk resistive MicroMegas. A dedicated high voltage power supply system, based on CAEN HV modules, has been built and put in operation: it controls more than 100 HV channels. The system is required to protect the detectors against errors by the operator, monitor voltages and currents at a 1 Hz rate and automatically react to detector misbehavior. It includes also a HV compensation system against environmental pressure and temperature variation to grant the detector stability. The operation of a MPGD based single photon detector poses challenging requirements to the high voltage power supply systems employed in terms of high-resolution diagnostic features and dynamic voltage control. Systems satisfying all the needed features are not commercially available; for this reason a novel single channel high voltage system matching the MPGD needs has been designed and realized. In this article the COMPASS RICH-1 MPGD HV system implementation is described as well as its performance in terms of stability of the novel MPGD-based photon detectors during the physics data taking at COMPASS. The design, implementation and performance of a novel HV power supply system based on DC to DC converters and controlled by a FPGA device is presented. The capabilities of the first prototype of the new single HV channel power supply are illustrated when operated with a MPGD based single photon detector during a test beam exercise. The preliminary result of the multi channel system are briefly discussed.
In 2016 we have upgraded the COMPASS RICH by novel gaseous photon detectors based on MPGD technology. Four new photon detectors, covering a total active area of 1.5
m
2
, have been installed in order ...to cope with the challenging efficiency and stability requirements of the COMPASS physics programme. The new detector architecture consists in a hybrid MPGD combination: two layers of THGEMs, the first of which also acts as a reflective photocathode thanks to CsI coating, are coupled to a bulk Micromegas on a pad-segmented anode. These detectors are the first application in an experiment of MPGD-based single photon detectors. Presently, we are further developing the MPGD-based PDs to make them adequate for a setup at the future EIC collider. All aspects of the COMPASS RICH-1 Photon Detectors upgrade are presented: R&D, engineering, mass production, QA and performance; the on-going development for collider application is also presented.
COMPASS is a fixed target experiment at CERN SPS aimed to study hadron structure and spectroscopy. Hadron identification in the momentum range between 3 and 55 GeV/c is provided by a large gaseous ...Ring Imaging Cherenkov Counter, RICH-1. To cope with the challenges imposed by the new physics program of COMPASS, RICH-1 has been upgraded by replacing four MWPC-based photon detectors with newly developed MPGD-based photon detectors. The architecture of the novel detectors is a hybrid combination of two layers of THGEMs and a Micromegas. The top of the first THGEM is coated with CsI acting as a reflective photo-cathode. The anode is segmented in pads capacitively coupled to the APV-25 based readout. The new hybrid detectors have been commissioned during the 2016 COMPASS data taking and stably operated during the 2017 run. In this paper design, construction, operation and performance aspects of the novel photon detectors for COMPASS RICH-1 are discussed.
This study reviews non-typhoid
Salmonella
(NTS)-related hospitalisations at National level in Spain between 2010 and 2015. NTS hospitalisations were obtained from the National Registry of ...Hospitalisations. A descriptive analysis of the hospitalisations was performed, including hospitalisation rates (HR) and case-fatality rates (CFR%) calculation. For those with NTS as Main Diagnosis logistic regression were used to estimate the relationship between the different factors and death outcome. 21,660 registered NTS-related hospitalisations were described (88.8% with
Salmonella
coded as Main Diagnosis). Average HR
2010–2015
was 7.7 (range, 7.3 to 8.1) hospitalisations/100,000 population. Those with NTS infections as Secondary Diagnosis were on average (
p
< 0.001) older (47.9 vs. 36.5 years), presented worse Charlson Comorbidity Index (2.1 vs. 1.2), higher CFR% (4.8% vs. 0.7%), spent more days hospitalised (15.1 vs. 5.8 days), and generated more costs (6173 vs. 4272 euros/per hospitalisation) than those with NTS as Main Diagnosis. For those with NTS as Main Diagnosis increased risk of death was related to being > 64 years old (OR = 20.99;
p
< 0.001); presenting septicaemia (OR = 15.82;
p
< 0.001) or localised infections (OR = 3.98;
p
= 0.061); Charlson Comorbidity Index > 3 (OR = 4.57;
p
< 0.001); a non-HIV co-infection (OR = 1.80;
p
= 0.013); other risk factors (OR = 5.70;
p
< 0.001); bowel perforation (OR = 70.30;
p
< 0.001); or acute renal failure (OR = 1.95;
p
= 0.001). In those with
Salmonella
as Main Diagnosis, among all complications, bowel perforation presented the strongest association with death outcome. Clinical practice guidelines can help to identify patients at risk of bowel perforation to reduce the fatality of the disease.
Abstract
The COMPASS RICH-1 detector underwent major upgrade in 2016 with the installation of four
novel MPGD-based photon detectors. They consist of large-size hybrid MPGDs with multi-layer
...architecture composed of two layers of Thick-GEMs and bulk resistive Micromegas. A dedicated high
voltage power supply system, realized with commercial devices, has been put in operation to
protect the detectors against errors by the operator, monitor and log voltages and currents at a 1 Hz rate, and automatically react to detector misbehavior; it includes also the HV compensation for
the detector gas pressure and temperature variations.
The needs posed to the high voltage
power supply systems by the operation of Micro Pattern Gaseous Detectors pushed the development of
a novel single channel HV system able to overcome the performance of the commercial devices in
terms of high-resolution diagnostic features and intelligent dynamic voltage control. In this talk
the COMPASS HV system and its performance are illustrated, as well as the stability of the novel
MPGD-based photon detectors during the physics data taking at COMPASS. The performance of the
novel single channel power supply system when connected to a single photon Micro Pattern Gaseous
Detector is presented in realistic working condition during a test beam with the preliminary
results of multiple channels operation.
The impact of β-glucan on the bioavailability of orange juice (OJ) flavanones was investigated in a randomised controlled trial. Volunteers consumed 500 mL of OJ without or with either 3 g (OB-3) or ...6 g (OB-6) of β-glucan. Urine samples, collected 12 h before and over a 0-24 h period post-supplementation, were analysed by high-performance liquid chromatography-high resolution mass spectrometry. The overall 0-24 h urinary excretion of the 17 flavanone metabolites identified and quantified in urine after OJ ingestion corresponded to 29.7 µmol, and 25.0 and 9.3 µmol, respectively, after OB-3 and OB-6 intake. This corresponds to 9.3, 7.9, and 2.9% recoveries of the 318 µmol of the ingested flavanones. The acute ingestion of OJ with 6 g, but not 3 g of β-glucan led to a significant reduction (p < 0.05) in the excretion of flavanone metabolites compared with consumption of OJ alone.
We describe a community-wide outbreak of measles due to a D4 genotype virus that took place in the Region of Madrid, Spain, between February 2011 and August 2012, along with the control measures ...adopted. The following variables were collected: date of birth, sex, symptoms, complications, hospital admission, laboratory test results, link with another cases, home address, places of work or study, travel during the incubation period, ethnic group, and Mumps-Measles-Rubella (MMR) vaccination status. Incidences were calculated by 100,000 inhabitants. A total of 789 cases were identified. Of all cases, 36.0% belonged to Roma community, among which 68.7% were 16 months to 19 y old. Non-Roma cases were predominantly patients from 6 to 15 months (28.1%) and 20 to 39 y (52.3%). Most cases were unvaccinated. We found out that 3.0% of cases were healthcare workers. The first vaccination dose was brought forward to 12 months, active recruitment of unvaccinated children from 12 months to 4 y of age was performed and the vaccination of healthcare workers and of members of the Roma community was reinforced. High vaccination coverage must be reached with 2 doses of MMR vaccine, aimed at specific groups, such as young adults, Roma population and healthcare workers.
Layered double hydroxides (LDH) M2+M3+CO32− were synthesized following the sol-gel methodology using Mg-Al, Mg-Fe, and Zn-Al as cation pairs for subsequent use in the preparation of TiO2/LDH ...materials. The samples were characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM), and the Brunauer–Emmett–Teller (BET) technique to determine the surface area (SA); the results of which were used to determine the roughness of the samples in terms of surface fractal dimension (D). The prepared materials exhibited both adsorption and photocatalytic properties in the removal of phenol in aqueous solution under ultraviolet irradiation. This work studies the relationship between the textural parameters of the materials obtained in relation to their photocatalytic efficiency and adsorption capacity, finding that the surface of the solids, their structural heterogeneity, and roughness condition the photodegradation and adsorption processes, using phenol as reference organic pollutant. The results show that different cation in LDH influences in photocatalytic capacity; the TiO2/ZnAl was the best material in one test, but after 10 times of test, the TiO2/MgFe gave the better photodegradation material. In adsorption capacity, TiO2/ZnAl and TiO2/MgFe have a close rate for phenol adsorption and both were better than TiO2/MgAl. The differences in textural characteristics (surface area, surface roughness, and pore-size distribution) affected phenol adsorption and photodegradation efficiency.
Long term experience with perfluorobutane in COMPASS RICH Bradamante, F.; Bressan, A.; Cicuttin, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
November 2023, 2023-11-00, Letnik:
1056
Journal Article
Recenzirano
Odprti dostop
COMPASS RICH-1 has used high-purity perfluorobutane as radiator gas since 2001. The operation and control of the radiator gas has evolved over years with continuous improvements. We report on the ...experience gained in the 20 year-long operation of perfluorobutane as COMPASS RICH radiator.
Very accurate values for the radiator gas refractive index are needed for high-performance particle identification. The procedure has evolved over years and the one presently in use, which provides refractive index estimate at the 1 ppm level, is discussed.
Perfluorobutane procurement is becoming challenging, and the minimization of material waste is now a priority for the protection of the environment. Commercially available perfluorobutane needs dedicated filtering before usage and typical material losses in the filtering procedure were around 30%. Recent efforts allowed us to reduce them to about 5%. A potential alternative to fluorocarbon radiators in gaseous RICHes is also presented.
The requirements posed to high voltage power supply systems by the operation of Micro Pattern Gaseous Detectors are specific in terms of high resolution diagnostic features and intelligent dynamic ...voltage control. These requirements are needed both when technology development is performed and when extended detector systems are supplied and monitored. Systems satisfying all the needed features are not commercially available.
A single channel high voltage system matching the Micro Pattern Gaseous Detector needs has been designed and realized, including its hardware and software components. The system employs a commercial DC∕DC converter and is coupled to a custom high resolution ammeter. Local intelligence, flexibility and high speed inter-connectivity are provided by a System on Chip Board and the use of a powerful FPGA. The single channel system has been developed, as critical milestone towards the realization of a multi-channel system.
The design, implementation and performance of the system are reported in detail in this article, as well as the performance of the single channel power supply when connected to a Micro Pattern Gaseous Detector in realistic working condition during a test beam exercise.
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