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Title |
Other Keywords |
Page |
| MOP020 |
Status of the PITZ Facility Upgrade
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gun, cathode, emittance, diagnostics |
76 |
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- A. Oppelt, K. Abrahamyan, G. Asova, J. W. Baehr, G. Dimitrov, H.-J. Grabosch, L. Hakobyan, Ye. Ivanisenko, S. Khodyachykh, S. A. Korepanov, M. Krasilnikov, B. Petrosyan, R. Spesyvtsev, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- J. H. Han
DESY, Hamburg
- O. Kalekin
Humboldt Universität zu Berlin, Berlin
- F. Marhauser, R. Richter, E. Weihreter
BESSY GmbH, Berlin
- J. R. Roensch
Uni HH, Hamburg
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The upgrade of the Photo Injector Test Facility at DESY in Zeuthen towards the PITZ2 stage is continuously ongoing. In Spring 2006, an intermediate stage was taken into operation (PITZ1.6), including a new gun cavity that has been tuned and conditioned. Currently, three new emittance measurement systems are being installed along the beamline. After their commissioning, studies of the emittance conservation principle will be possible when using the available booster cavity. In the paper, the results of the RF commissioning of the new gun and the first beam measurements using recently installed diagnostics devices will be presented. The ongoing developments of further new diagnostics components will be discussed as well.
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| TUP062 |
Experimental Optimization of TTF2 RF Photoinjector for Emittance Damping
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emittance, gun, laser, damping |
391 |
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- Y. Kim
FEL/Duke University, Durham, North Carolina
- K. Floettmann, F. Loehl, S. Schreiber
DESY, Hamburg
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To get lasing and saturation at FEL facilities, we should generate high quality electron beams with a low emittance, a high peak current, and a low energy spread. Generally, the RF photoinjector is a key component to generate such a high quality beams. During DESY TESLA Test Facility (TTF) phase 2 commissioning, we optimized our L-band RF photoinjector and bunch compressor by comparing measurement results and simulation ones. In this paper, we describe our optimization experiences to get about 1.1 mm.mrad transverse normalized emittance for 1.0 nC single bunch charge and 4.4 ps RMS bunch length from TTF phase 2 RF photoinjector.
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| THP033 |
Pulsed RF Heating Particularities in Normal-Conducting L-band Cavities
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gun, cathode, linac, positron |
646 |
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- V. V. Paramonov, A. K. Skasyrskaya
RAS/INR, Moscow
- K. Floettmann
DESY, Hamburg
- F. Stephan
DESY Zeuthen, Zeuthen
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For present projects, such as X-FEL and ILC, the SC technology is chosen for the main linacs. However, in some special parts, NC cavities are applied, operating with high electric and magnetic fields. RF gun cavities with an electric field up to 60 MV/m at the photo cathode are now under development. Capture cavities in the ILC positron source should operate with an accelerating gradient of up to 15 MV/m, practically the same value (14 MV/m), as for the CDS booster cavity in the Photo Injector Test Facility at DESY in Zeuthen (PITZ). High field strength leads to high specific RF heat loading. In combination with long RF pulses (~ 1ms) it results in substantial surface temperature rise, small cavity shape deformations and measurable frequency shifts. In this report we discuss both particularities and some general regularities related to long pulse operation of L-band cavities. Results of 3D numerical simulations for cavity surface temperature, displacements distributions and corresponding frequency shifts for different cavities are presented and compared with existing experimental data. The presented results will give the input for cavities optimization and sub-systems improvements.
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| THP037 |
Wide-Range Frequency Compensation by Coaxial Ball-Screw Tuner
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resonance, acceleration, linear-collider, monitoring |
658 |
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- T. Higo, Y. Higashi, Y. Morozumi, K. Saito, K. Ueno, H. Yamaoka
KEK, Ibaraki
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Low-loss 9-cell 1.3GHz cavities are studied at KEK aiming at a high-gradient operation for the International Linear Collider. One of the most important issues to realize such a high gradient in a pulsed operation of super-conducting cavities is the issue of how to compensate the Lorentz detuning. The Lorentz detuning of the cavity amounts to 3kHz at 45MV/m acceleration field. None of the tuners to date have achieved this range. A coaxial ball-screw tuner was designed and proved to reach this level in the room temperature operation. The performance at liquid Nitrogen temperature is also studied. From these results, we try to evaluate the feasibility of the operation at 2K.
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| THP044 |
Design and Development of RF Structures for Linac4
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linac, klystron, coupling, quadrupole |
679 |
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- M. Vretenar, N. Alharbi, F. Gerigk, M. Pasini, R. Wegner
CERN, Geneva
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Linac4 is a new 160 MeV H- linac proposed at CERN to replace the 50 MeV Linac2 as injector to the PS Booster, with the goal of doubling its brightness and intensity. The present design foresees after RFQ and chopping line a sequence of three accelerating structures: a Drift Tube Linac (DTL) from 3 to 40 MeV, a Cell-Coupled DTL (CCDTL) to 90 MeV and a Side Coupled Linac (SCL) up to the final energy. The DTL and CCDTL operate at 352 MHz, while in the SCL the frequency is doubled to 704 MHz. Although the injection in the PS Booster requires only a low duty cycle, the accelerating structures are designed to operate at the high duty cycle required by a possible future extension to a high power linac driver for a neutrino facility. This paper presents the different accelerating structures, underlining the progress in the design of critical resonator elements, like post-couplers in the DTL, coupling slots in the CCDTL and bridge couplers for the SCL. Alternative structures to the SCL are analysed and compared. Prototyping progress for the different structures is reported, including the RF design of a DTL tank prototype and results of low and high power tests on a CCDTL prototype.
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