MPE

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2018-08-31
11:22
[PUBDB-2018-03309] Report
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A Design of a 3rd Harmonic Cavity for the TTF 2 Photoinjector
[TESLA FEL 2002-05]
26 pp. ()
A design of a superconducting 3.9 GHz cavity for the in-jector of the TTF FEL-User Facility is presented. The cav-ity will be located after the first TESLA module with eight1.3 GHz cavities and before the first bunch compressor. [...]
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2018-08-31
10:39
[PUBDB-2018-03303] Report
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Higher Order Modes of a 3rd Harmonic Cavity with an Increased End-cup Iris
[FERMILAB-TM-2210;TESLA-FEL 2003-01]
30 pp. ()
The cavity design for a 3rdharmonic cavity for the TTF 2 photoinjector has been revisedto increase the coupling between the main coupler and the cavity cells. The iris radius ofthe end cup of the cavity has been increased to accomplish a better coupling. [...]
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2018-08-29
17:16
OpenAccess [PUBDB-2018-03245] Journal Article
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PETRA IV: the ultralow-emittance source project at DESY
The PETRA IV project aims at upgrading the present synchrotron radiation source PETRA III at DESY into an ultralow-emittance source. Being diffraction limited up to X-rays of about 10 keV, PETRA IV will be ideal for three-dimensional X-ray microscopy of biological, chemical and physical processes under realistic conditions at length scales from atomic dimensions to millimetres and time scales down to the sub-nanosecond regime [...]
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2018-06-26
10:18
OpenAccess [PUBDB-2018-02380] Contribution to a conference proceedings
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Automatic Tuning of PETRA, its Injector Complex, and Prospects of Autonomous Operation of PETRA IV
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 4 pp. () [10.3204/PUBDB-2018-02380]  GO
We present the progress in tuning automation of the PETRAinjection complex. The OCELOT optimizer has beenported to the PETRA control system and proof-of-principletests of transmission efficiency optimization done. [...]
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2018-06-21
10:31
OpenAccess [PUBDB-2018-02340] Contribution to a conference proceedings
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Status of Impedance Modeling for the PETRA IV
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 4 pp. () [10.3204/PUBDB-2018-02340]  GO
The diffraction limited synchrotron light source envisioned for the PETRA IV project will require strong focusing to produce the small emittances in both planes. The large natural chromaticity together with small dispersion will require very strong sextupoles. [...]
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2018-06-12
14:33
OpenAccess [PUBDB-2018-02251] Contribution to a conference proceedings
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Influence of Intrabeam Scattering on the Emittance of PETRA III
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 4 pp. () [10.3204/PUBDB-2018-02251]  GO
PETRA III is a 6 GeV hard X-ray synchrotron radiation source at DESY in Hamburg (Germany) and is in user operation since 2010. The natural emittance of PETRA III is extremely low with 1.3 nm·rad and the coupling is typically less than 1 %. [...]
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2018-05-31
09:14
OpenAccess [PUBDB-2018-02151] Contribution to a conference proceedings
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Microwave instability and energy spread measurement via vertical dispersion bump in PETRA III
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 3 pp. () [10.3204/PUBDB-2018-02151]  GO
The recent measurement of bunch length versus current indicated that the longitudinal impedance (Z/n) is 0.15 Ohm in close agreement with the impedance model [1]. Naïve application of Keil-Schnell criteria predicts that the threshold of microwave instability at 0.25 mA. [...]
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2018-05-30
11:47
OpenAccess [PUBDB-2018-02141] Contribution to a conference proceedings
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Beam Dynamics on a Coupling Resonance at PETRA III
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 3 pp. () [10.3204/PUBDB-2018-02141]  GO
Working on a coupling resonance is a usual way of producing round beams in a synchrotron. The beam dynamics in this regime is however more complicated, and the emittance is sensitive to the working point, coupling correction, and bunch current drop with time, which complicates the operation. [...]
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2018-05-23
13:06
[PUBDB-2018-02057] Poster
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Microwave instability and energy spread measurement via vertical dispersion bump in PETRA III
9th International Particle Accelerator Conference, IPAC’18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04
The recent measurement of bunch length versus current indicated that the longitudinal impedance (Z/n) is 0.15 Ohm in close agreement with the impedance model [1]. Naïve application of Keil-Schnell criteria predicts that the threshold of microwave instability at 0.25 mA. [...]

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2018-05-18
23:15
OpenAccess [PUBDB-2018-02011] Contribution to a conference proceedings
; ; ; et al
Influence of Intrabeam Scattering on the Emittance of PETRA III
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 4 pp. () [10.3204/PUBDB-2018-02011]  GO
PETRA III is a 6 GeV hard X-ray synchrotron radiation source at DESY in Hamburg (Germany) and is in user operation since 2010. The natural emittance of PETRA III is extremely low with 1.3 nm*rad and the coupling is typically less than 1%. [...]
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