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  1. Book ; Online: RF measurements I

    Caspers, F.

    signal receiving techniques

    2012  

    Abstract: For the characterization of components, systems and signals in the RF and microwave range, several dedicated instruments are in use. In this paper the fundamentals of the RF-signal sampling technique, which has found widespread applications in 'digital' ... ...

    Abstract For the characterization of components, systems and signals in the RF and microwave range, several dedicated instruments are in use. In this paper the fundamentals of the RF-signal sampling technique, which has found widespread applications in 'digital' oscilloscopes and sampling scopes, are discussed. The key element in these front-ends is the Schottky diode which can be used either as an RF mixer or as a single sampler. The spectrum analyser has become an absolutely indispensable tool for RF signal analysis. Here the front-end is the RF mixer as the RF section of modern spectrum analysers has a rather complex architecture. The reasons for this complexity and certain working principles as well as limitations are discussed. In addition, an overview of the development of scalar and vector signal analysers is given. For the determination of the noise temperature of a one-port and the noise figure of a two-port, basic concepts and relations are shown. A brief discussion of commonly used noise measurement techniques concludes the paper.

    Comment: 24 pages, contribution to the CAS - CERN Accelerator School: Specialised Course on RF for Accelerators; 8 - 17 Jun 2010, Ebeltoft, Denmark
    Keywords Physics - Accelerator Physics
    Subject code 621
    Publishing date 2012-01-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book ; Thesis: Vergleichende Untersuchungen zum Säurebasenstatus von Erythrozytenkonzentraten in Abhängigkeit von der Lagerung in Beuteln aus unterschiedlichen Kunststoffolien

    Caspers, Friedhelm

    1991  

    Author's details vorgelegt von: Friedhelm Caspers
    Size 73 S. : graph. Darst.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Bonn, Univ., Diss., 1991
    HBZ-ID HT003980701
    Database Catalogue ZB MED Medicine, Health

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    Shelf markLoan statusLocation
    92 D 1539 order for loan Magazin

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  3. Article ; Online: Resistive cooling circuits for charged particle traps using crystal resonators.

    Kaltenbacher, T / Caspers, F / Doser, M / Kellerbauer, A / Pribyl, W

    The Review of scientific instruments

    2011  Volume 82, Issue 11, Page(s) 114702

    Abstract: The paper addresses a novel method to couple a signal from charged particles in a Penning trap to a high Q resonant circuit using a crystal resonator. Traditionally, the trap capacity is converted into a resonator by means of an inductance. The tuned ... ...

    Abstract The paper addresses a novel method to couple a signal from charged particles in a Penning trap to a high Q resonant circuit using a crystal resonator. Traditionally, the trap capacity is converted into a resonator by means of an inductance. The tuned circuit's Q factor is directly linked to the input impedance "seen" by the trapped particles at resonance frequency. This parallel resonance impedance is a measure of the efficiency of resistive cooling and thus it should be optimized. We propose here a commercially available crystal resonator since it exhibits a very high Q value and a parallel resonance impedance of several MΩ. The possibility to tune the parallel resonance frequency of the quartz results in filter behavior that allows covering a range of some tens of its 3dB bandwidth by means of tuning.
    Language English
    Publishing date 2011-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.3663610
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Development of a diagonal-cut type beam position monitor for the booster ring in the High Intensity Heavy-Ion Accelerator Facility project.

    Du, Ze / He, Peilin / Zhu, Guangyu / Caspers, Fritz / Li, Zhixue / Wu, Junxia / Hu, Xuejing / Zhang, Zhaolong / Xie, Hongming / Ni, Fafu / Zhang, Yong / Yang, Yongliang / Yang, Jiancheng / Meng, Jun

    The Review of scientific instruments

    2021  Volume 93, Issue 4, Page(s) 43306

    Abstract: A diagonal-cut type beam position monitor (BPM) has been developed for the High Intensity Heavy-Ion Accelerator Facility (HIAF) project at the Institute of Modern Physics. Compared with other types of BPMs, the diagonal-cut type BPM has almost perfect ... ...

    Abstract A diagonal-cut type beam position monitor (BPM) has been developed for the High Intensity Heavy-Ion Accelerator Facility (HIAF) project at the Institute of Modern Physics. Compared with other types of BPMs, the diagonal-cut type BPM has almost perfect position linearity, i.e., no non-linear correction required, which is advantageous for beams that are transversally large and have a complex charge distribution. The key parameters for the diagonal-cut type BPM have been simulated and optimized in detail and systematically herein. It was found that the crosstalk is improved by ∼10 dB at 160 MHz by insertion of a separate ring between two horizontal or vertical electrodes of the BPM made of stainless steel with vacuum as a dielectric. Furthermore, the longitudinal and transverse numerical simulation to evaluate the beam impedance on the diagonal-cut type BPM has been performed. The results for the crosstalk, position sensitivity, and electrode capacitance to ground obtained from simulations and laboratory measurements agree well. The vacuum of the BPM prototype after baking out at 250 °C for 72 h is better than 1.0 × 10
    Language English
    Publishing date 2021-04-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0083344
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Priorisierung und Management von EDV-Projekten

    Caspers, Friedrich

    Adam : Dietrich S. 77-96

    1996  

    Institution Allianz-Aktiengesellschaft Holding
    Author's details von Friedrich Caspers
    Keywords Informationsmanagement ; Projektmanagement ; Versicherung ; Deutschland
    Language German
    Publisher Gabler
    Publishing place Wiesbaden
    Document type Article
    ISBN 3-409-12909-X ; 978-3-409-12909-1
    Database ECONomics Information System

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  6. Article ; Online: First Results from an Axion Haloscope at CAPP around 10.7  μeV.

    Kwon, Ohjoon / Lee, Doyu / Chung, Woohyun / Ahn, Danho / Byun, HeeSu / Caspers, Fritz / Choi, Hyoungsoon / Choi, Jihoon / Chung, Yonuk / Jeong, Hoyong / Jeong, Junu / Kim, Jihn E / Kim, Jinsu / Kutlu, Çağlar / Lee, Jihnhwan / Lee, MyeongJae / Lee, Soohyung / Matlashov, Andrei / Oh, Seonjeong /
    Park, Seongtae / Uchaikin, Sergey / Youn, SungWoo / Semertzidis, Yannis K

    Physical review letters

    2021  Volume 126, Issue 19, Page(s) 191802

    Abstract: The Center for Axion and Precision Physics Research at the Institute for Basic Science is searching for axion dark matter using ultralow temperature microwave resonators. We report the exclusion of the axion mass range 10.7126-10.7186  μeV with near Kim- ... ...

    Abstract The Center for Axion and Precision Physics Research at the Institute for Basic Science is searching for axion dark matter using ultralow temperature microwave resonators. We report the exclusion of the axion mass range 10.7126-10.7186  μeV with near Kim-Shifman-Vainshtein-Zakharov (KSVZ) coupling sensitivity and the range 10.16-11.37  μeV with about 9 times larger coupling at 90% confidence level. This is the first axion search result in these ranges. It is also the first with a resonator physical temperature of less than 40 mK.
    Language English
    Publishing date 2021-05-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.191802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Search for Dark Matter Axions with CAST-CAPP.

    Adair, C M / Altenmüller, K / Anastassopoulos, V / Arguedas Cuendis, S / Baier, J / Barth, K / Belov, A / Bozicevic, D / Bräuninger, H / Cantatore, G / Caspers, F / Castel, J F / Çetin, S A / Chung, W / Choi, H / Choi, J / Dafni, T / Davenport, M / Dermenev, A /
    Desch, K / Döbrich, B / Fischer, H / Funk, W / Galan, J / Gardikiotis, A / Gninenko, S / Golm, J / Hasinoff, M D / Hoffmann, D H H / Díez Ibáñez, D / Irastorza, I G / Jakovčić, K / Kaminski, J / Karuza, M / Krieger, C / Kutlu, Ç / Lakić, B / Laurent, J M / Lee, J / Lee, S / Luzón, G / Malbrunot, C / Margalejo, C / Maroudas, M / Miceli, L / Mirallas, H / Obis, L / Özbey, A / Özbozduman, K / Pivovaroff, M J / Rosu, M / Ruz, J / Ruiz-Chóliz, E / Schmidt, S / Schumann, M / Semertzidis, Y K / Solanki, S K / Stewart, L / Tsagris, I / Vafeiadis, T / Vogel, J K / Vretenar, M / Youn, S / Zioutas, K

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 6180

    Abstract: The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 μeV to 22.47 μeV mass range. The detection concept follows the Sikivie haloscope principle, where Dark Matter axions convert into photons ...

    Abstract The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 μeV to 22.47 μeV mass range. The detection concept follows the Sikivie haloscope principle, where Dark Matter axions convert into photons within a resonator immersed in a magnetic field. The CAST-CAPP resonator is an array of four individual rectangular cavities inserted in a strong dipole magnet, phase-matched to maximize the detection sensitivity. Here we report on the data acquired for 4124 h from 2019 to 2021. Each cavity is equipped with a fast frequency tuning mechanism of 10 MHz/ min between 4.774 GHz and 5.434 GHz. In the present work, we exclude axion-photon couplings for virialized galactic axions down to g
    Language English
    Publishing date 2022-10-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-33913-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: In memoriam Dr. Edgar Olbrechts 1883-1965.

    Caspers, F

    Acta tuberculosea et pneumologica Belgica

    1965  Volume 56, Issue 1, Page(s) 5–7

    Title translation In memoriam Dr. Edgar Olbrechts, 1883-1965.
    MeSH term(s) Belgium ; History, 20th Century ; Tuberculosis/prevention & control
    Language French
    Publishing date 1965-01
    Publishing country Belgium
    Document type Biography ; Historical Article ; Journal Article
    ZDB-ID 127150-7
    ISSN 0001-7078
    ISSN 0001-7078
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Uh II Zs.29: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  9. Article: Measurement of electron clouds in large accelerators by microwave dispersion.

    De Santis, S / Byrd, J M / Caspers, F / Krasnykh, A / Kroyer, T / Pivi, M T F / Sonnad, K G

    Physical review letters

    2008  Volume 100, Issue 9, Page(s) 94801

    Abstract: Clouds of low energy electrons in the vacuum beam pipes of accelerators of positively charged particle beams present a serious limitation for operation at high currents. Furthermore, it is difficult to probe their density over substantial lengths of the ... ...

    Abstract Clouds of low energy electrons in the vacuum beam pipes of accelerators of positively charged particle beams present a serious limitation for operation at high currents. Furthermore, it is difficult to probe their density over substantial lengths of the beam pipe. We have developed a novel technique to directly measure the electron cloud density via the phase shift induced in a TE wave transmitted over a section of the accelerator and used it to measure the average electron cloud density over a 50 m section in the positron ring of the PEP-II collider at the Stanford Linear Accelerator Center.
    Language English
    Publishing date 2008-03-07
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.100.094801
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Book ; Thesis: Vergleichende Untersuchungen zum Säurebasenstatus von Erythrozytenkonzentraten in Abhängigkeit von der Lagerung in Beuteln aus unterschiedlichen Kunststoffolien

    Caspers, Friedhelm

    1991  

    Author's details Friedhelm Caspers
    Language Undetermined
    Size 73 S, graph. Darst, 21 cm
    Document type Book ; Thesis
    Thesis / German Habilitation thesis @Bonn, Univ., Diss. : 1991
    Database Former special subject collection: coastal and deep sea fishing

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