Internal Reports

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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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2018-09-27
15:27
OpenAccess [PUBDB-2018-03666] Book/Report/Internal Report
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Achievement of 35 MV/m in the Superconducting Nine-Cell Cavities for TESLA
[TESLA 2004-05]
TESLA Reports 20 pp. () [10.3204/PUBDB-2018-03666]  GO
The Tera Electronvolt Superconducting Linear Accelerator TESLA is the only linear electron-positron collider project based on superconductor technology for particle acceleration. In the first stage with 500 GeV center-of-mass energy an accelerating field of 23.4 MV/m is needed in the superconducting niobium cavities which are operated at a temperature of 2 K and a quality factor $Q_{0}$ of $10^{10}$ [...]
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2018-09-27
14:08
OpenAccess [PUBDB-2018-03658] Book/Report/Internal Report
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Improved Surface Treatment of the Superconducting TESLA Cavities
[TESLA 2004-04]
TESLA Reports 11 pp. () [10.3204/PUBDB-2018-03658]  GO
The proposed linear electron-positron collider TESLA is based on 1.3 GHz superconducting niobium cavities for particle acceleration. For a center-of-mass energy of 500 GeV an accelerating field of 23.4 MV/m is required which is reliably achieved with a niobium surface preparation by chemical etching. [...]
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2018-09-27
13:47
OpenAccess [PUBDB-2018-03653] Book/Report/Internal Report
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Beam Dynamics Simulations for European XFEL
[TESLA-FEL 2013-04]
TESLA-FEL Reports 31 pp. () [10.3204/PUBDB-2018-03653]  GO
The European x-ray free electron laser (EXFEL) which is under construction will be a free electron laser facility based on self-amplified spontaneous emission (SASE). This facilitycan produce hard X-ray photons with 1 angstrom wavelength in undulator section SASE1, hard X-ray photons with 0.1-0.4nm wavelength in section SASE2, and soft X-ray photons with 0.4-1.6 nm wavelength in section SASE3. [...]
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2018-09-27
13:30
OpenAccess [PUBDB-2018-03652] Book/Report/Internal Report

Comparison of Stripline and Cavity Beam Position Monitors
[TESLA Report 2004-03]
TESLA Reports 9 pp. () [10.3204/PUBDB-2018-03652]  GO
Operational principles of stripline and pill-box cavity beam position monitors (BPMs) are discussed. Their theoretically best achievable position and time resolutions are computed. [...]
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2018-09-27
09:47
OpenAccess [PUBDB-2018-03625] Book/Report/Internal Report
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Anti-multipactor TiN coating of RF power coupler components for TESLA at DESY
[TESLA Report 2004-02]
TESLA Reports 40 pp. () [10.3204/PUBDB-2018-03625]  GO
A development project was carried out at DESY, aimed at reducing secondary electron emission and multipactor effects in TESLA couplers by TiN layers generation on surfaces which were not protected in this way previously. Thin TiN films on ceramic or metallic surfaces were produced by deposition from Ti vapor in low pressure ammonia. [...]
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2018-09-27
09:37
[PUBDB-2018-03621] Book/Report/Internal Report
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Wake Fields Generated by the LOLA-IV Structure and the $3^{rd}$ Harmonic Section in TTF-II
[TESLA Report 2004-01]
TESLA Reports 21 pp. ()
In this report we estimate long- and short-range wake functions for new elements to be used in TESLA Test Facility (TTF) – II. The wake potentials of the LOLA-IV structure and the $3^{rd}$ harmonic section are calculated numerically for very short bunches and analytical approximations for wake functions in short and long ranges are obtained by fitting procedures based on analytical estimations..
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2018-09-27
09:20
OpenAccess [PUBDB-2018-03620] Internal Report
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Numerical Studies on the Electro-Optic Sampling of Relativistic Electron Bunches
33 pp. () [10.3204/PUBDB-2018-03620]  GO
At the 1 GeV electron linac of the DESY vacuum-ultraviolet free-electron laseran electro-optic (EO) sampling experiment has been installed permitting to measurethe time structure of the bunches with high resolution. The transient electric fieldof the relativistic bunch corresponds to a sub-picosecond THz pulse which induces abirefringence in an electro-optic crystal. [...]
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2018-08-30
14:34
OpenAccess [PUBDB-2018-03285] Report/Internal Report

Relativity and Synchrotron Radiation: Critical Reexamination of Existing Theory
[DESY-18-113; arXiv:1808.07808]
103 pp. () [10.3204/PUBDB-2018-03285]  GO
Maxwell's equations are valid only in Lorentz frame i.e. in inertial frame where the Einstein synchronization procedure is used to assign values of the time coordinate. [...]
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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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