MSK

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2018-10-11
11:05
OpenAccess [PUBDB-2018-03751] Contribution to a conference proceedings
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Status of the 10 MW MBKs during Commissioning of the European XFEL in DESY
29th Linear Accelerator Conference, LINAC18, BeiingBeiing, China, 17 Sep 2018 - 21 Sep 20182018-09-172018-09-21 Geneva : JACoW 109-111 () [10.3204/PUBDB-2018-03751]  GO
At present 26 RF stations for European XFEL are inoperation. Each RF station consists of a HV modulatorlocated in a separate building on the DESY campus, up to1600 m long 10 kV HV cables that connect the modulatorand the HV pulse transformer located in the undergroundtunnel, 120kV, 3 m long HV cable connecting the HVpulse transformer and the connection module (CM) of thehorizontal multi-beam klystron (MBK). [...]
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2018-10-10
14:13
OpenAccess [PUBDB-2018-03747] Report/Internal Report

Android Application for Calculation of One-Dimensional Pressure Profiles in Vacuum Pipes: eine Android App zum Berechnen von eindimensionalen Druckprofilen in Strahlrohren
[DESY-M-18-03]
10 pp. () [10.3204/PUBDB-2018-03747]  GO
The programs calcvac/vacline can calculate logitudinal one-dimensional pressure profiles in vacuum pipes. The pipes can consist of different sections of different shape and material. [...]
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2018-10-04
12:53
OpenAccess [PUBDB-2018-03711] Contribution to a conference proceedings
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High-Speed Direct Sampling FMC for Beam Diagnostic and Accelerator Protection Applications
7th International Beam Instrumentation Conference, IBIC 2018, ShanghaiShanghai, China, 9 Sep 2018 - 13 Sep 20182018-09-092018-09-13 4 pp. () [10.3204/PUBDB-2018-03711]  GO
The rapid development in the field of digitizers is leading to Analog-to-Digital Converters (ADC) with ever higher sampling rates. Nowadays many high-speed digitizers for RF applications and radio communication are available, which can sample broadband signals, without the need of down converters. [...]
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2018-10-04
12:45
OpenAccess [PUBDB-2018-03710] Contribution to a conference proceedings
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First Electro-Optical Bunch Length Measurements from the European XFEL
7th International Beam Instrumentation Conference, IBIC 2018, ShanghaiShanghai, China, 9 Sep 2018 - 13 Sep 20182018-09-092018-09-13 4 pp. () [10.3204/PUBDB-2018-03710]  GO
Three electro-optical bunch length detection systems based on spectral decoding have been installed and are being commissioned at the European XFEL. The systems are capable of recording individual longitudinal bunch profiles with sub-picosecond resolution at a bunch repetition rate 1.13 MHz. [...]
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2018-09-12
11:54
OpenAccess [PUBDB-2018-03460] Journal Article
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Precision Feedback Control of a Normal Conducting Standing Wave Resonator Cavity
In this paper, the system identification and feedback controller design for a normal conducting Standing wave radio frequency cavity operated in pulsed mode of a free electron laser is presented. The system identification, essential to achieve high performance control, is based on a grey box model, with a priori knowledge about the physical behavior. [...]
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ddc:530
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2018-08-31
09:58
[PUBDB-2018-03296] Report
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Proposed continuous wave energy recovery operation of an XFEL
[TESLA-FEL 2004-03 ]
11 pp. ()
Commissioning of two large coherent light facilities at SLAC and DESY should begin in 2008 and in 2011 respectively. In this paper we look further into the future, hoping to answer, in a very preliminary way, two questions [...]
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2018-08-25
23:32
OpenAccess [PUBDB-2018-03166] Dissertation / PhD Thesis
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Longitudinal Diagnostics for Beam-Based Intra Bunch-Train Feedback at FLASH and the European XFEL
178 pp. () [10.3204/PUBDB-2018-03166] = Dissertation, Universität Hamburg, 2018  GO
Diagnostics and control of the electron beam parameters in order to provide stable and reproducible experimental conditions for the photon users are a crucial part of operating a free-electron laser. For the beam-based longitudinal feedback at FLASH and the European XFEL, three monitor types are discussed: bunch arrival time monitor (BAM), bunch compression monitor (BCM) and synchrotron radiation monitor (SRM). [...]
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2018-08-17
16:36
[PUBDB-2018-03042] Book/Report
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CHECHIA cavity driving with FPGA controller
[TESLA Report 2005-12 ]
TESLA Reports 18 pp. ()
The initial control of the superconductive cavity has recently been performed by applying the FPGA (Field Programmable Gate Array) technology system in DESY Hamburg. This first experiment turned attention to the general recognition of the cavity features and projected control methods. [...]
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2018-08-17
11:22
[PUBDB-2018-02997] Book/Report
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Fertigungsablauf des einzelligen Standard DESY 1.3 GHz Resonators aus Niob
[TTC-Report 2010‐01]
TESLA Reports 11 pp. ()
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2018-07-17
09:43
OpenAccess [PUBDB-2018-02624] Report/Internal Report

A Simple Automatic Radiation Alarm System for the XFEL Main LINACEin einfaches Strahlungsalarm-System für den XFEL Main Linac
[DESY-Technical-Note-18-01]
7 pp. () [10.3204/PUBDB-2018-02624]  GO
XFEL läuft schon seit einiger Zeit im Routinebetrieb. Jedoch sind noch Bemühungen im Gange, den Betrieb weiter zu optimieren, und insbesondere auch höhere Energien zu erreichen.Hierzu werden die Cavitiy-Spannungen sukzessiv erhöht, bis das sogenannte Quench-Limit erreicht wird. [...]
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