RUPAC2012 - List of Keywords (cavity)

Paper	Title	Other Keywords	Page
WEYCH02	Multipurpose Research Complex Based on the INR High Intensity Proton Linac	linac, DTL, proton, neutron	90
	L.V. Kravchuk, A. Feschenko, M.I. Grachev, V.L. Serov RAS/INR, Moscow, Russia
	Funding: Russian Academy of Science Scientific Complex based on the 600 MeV Proton Linac is under operation at the INR, Troitsk, Moscow to provide both basic and applied research. At the moment proton beam from the Linac with energy about 210 MeV and average current about 130 μA is transporting to the Experimental Area to be use for following facilities: three Spallation Neutron sources, the Isotope Production facility and the Beam Therapy complex. Status of the Linac and Experimental Area as well as the tuning procedures to decrease particle loss in high-intensity mode of operation are given in the paper.
	Slides WEYCH02 [2.281 MB]

THAOR06	Update on SCRF Development at TRIUMF	TRIUMF, linac, HOM, cryomodule	152
	V. Zvyagintsev, B. Amini, K. Fong, P.R. Harmer, D. Kishi, P. Kolb, A. Koveshnikov, D. Lang, R.E. Laxdal, A.K. Mitra, N. Muller, C. Schaub, R.W. Shanks, B.S. Waraich, Q. Zheng TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada S.H. Abidi, R.S. Orr University of Toronto, Toronto, Ontario, Canada R. Edinger PAVAC, Richmond, B.C., Canada M. Gusarova, I.I. Petrushina, N.P. Sobenin, D.B. Tikhonov MEPhI, Moscow, Russia A. Vrielink UBC, Vancouver, B.C., Canada
	Since 2007 TRIUMF started development of eLINAC which is a 50 MeV 10 mA CW electron superconducting linear accelerator to be used as a driver to produce radioactive ion beams through photofission. The accelerator is based on five 1.3 GHz TTF/ILC elliptical bulk Nb cavities technology to be mounted in three cryomodules; an injector cryomodule with one cavity and two accelerating modules with two cavities each. The ISAC-II project superconducting heavy ion linear accelerator was successfully completed in 2010 and we now have in operation 40 superconducting bulk Nb QWR cavities assembled in eight cryomodules. Results and plans of the SCRF program and experience of ISAC-II operation at TRIUMF will be discussed.
	Slides THAOR06 [3.309 MB]

THCCH02	Characteristics of the Model of Linear Accelerator Based on Parallel Coupled Accelerating Structure with Beam Loading	electron, beam-loading, injection, gun	164
	Y.D. Chernousov ICKC, Novosibirsk, Russia A.M. Barnyakov, A.E. Levichev, V.M. Pavlov BINP SB RAS, Novosibirsk, Russia V. Ivannikov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	The 5-cavity model of linear accelerator based on the parallel coupled accelerating structure (LAPCAS) is under study. Linear accelerator is equipped with focusing system based on permanent magnet and three-electrode gun with RF control. The work of accelerator with electron beam is demonstrated. The parameters of short pulses mode are following: electron energy - 4 MeV, pulse current - 0.3 A, pulse duration - 2.5 ns; the parameters of long pulses mode are following: energy - 2.5 MeV, pulse current - 0. 1A, pulse duration - 0.1 - 4 us. Working frequency of the accelerator is 2.45 GHz. In RF-controlled mode the capture of about 100% is demonstrated. The beam loading effect is observed. The compensation of energy spread of accelerated electrons by delaying the moment of injection in the LAPCAS is demonstrated. The equations of transient process in the accelerating cavity which is powered by an external RF generator and excited by electron bunches in a simple form are presented.
	Slides THCCH02 [1.154 MB]

MOPPA018	Localization of the RF Breakdown in the Parallel Coupled Accelerating Structure	coupling, acceleration, electron, collider	281
	Y.D. Chernousov, A.M. Barnyakov, A.E. Levichev, V.M. Pavlov BINP SB RAS, Novosibirsk, Russia V. Ivannikov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	Parallel coupled accelerating structures (PCAS) with parallel RF power feeding of accelerating cavities has some features and advantages in compare with conventional traveling wave and standing wave structures with sequential RF power feeding. Parallel feeding of accelerating cavities minimizes the RF power flow via coupling slot and determines individual behavior of each cell in the regime of RF breakdown. These features can be used for developing of high gradient accelerating structures. The experimental data of the breakdown modes in the PCAS are presented.

MOPPA019	RF Antenna Lead	high-voltage, radiation, electron, simulation	284
	A.M. Barnyakov, A.E. Levichev BINP SB RAS, Novosibirsk, Russia Y.D. Chernousov ICKC, Novosibirsk, Russia V. Ivannikov, I.V. Shebolaev ICKC SB RAS, Novosibirsk, Russia
	RF antenna lead is described. This lead is used for RF power input to high voltage electrodes. The device consists of receiving and transmitting antennas realized as symmetrical parts of coaxial cavity with dielectric disk between the parts. Main operating characteristics are the following: high voltage is over 60 kV, coefficient of transmission at the operating frequency is over 0.97, bandpass is over 70% (at the level of -3dB). The scheme of the device, principle of work and measured results are presented.

MOPPA020	Multipactor Discharge in eLINAC Accelerator	accelerating-gradient, simulation, TRIUMF, multipactoring	287
	M. Gusarova, I.I. Petrushina MEPhI, Moscow, Russia V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	This paper concerns numerical simulations and experimental investigation of multipacting discharge in accelerating cavities and feeding waveguide section of eLINAC accelerator. The threshold values of accelerating gradient and input power for discharge may occur in these structures have been obtained experimentally and compared to numerical predictions. Secondary emission influence on discharge behavior were also considered.

MOPPA022	Status of INR DTL RF System	DTL, linac, vacuum, cathode	293
	A.I. Kvasha, A. Feschenko, V.L. Serov RAS/INR, Moscow, Russia
	INR Linac is in regular operation since 1993. The accelerator incorporates DTL and DAW structures operating at 198.2 MHz and 991 MHz correspondingly. Initially two types of high power vacuum tubes specially designed for INR linac (GI-54A for final amplifier and GI-51A for intermediate amplifier) were used in DTL RF power system. However production of these tubes has been terminated resulting in a need of DTL RF system upgrade. The main goal of the recent upgrade is replacement of the old tubes by modern ones. The difficulty of replacement arises due to a need to minimize mechanical changes of the existing equipment. Another goal is improving of operational reliability. The reliability depends on vacuum tube reliability and to a large extent - on crowbar operation. The results and the experience of INR DTL RF system upgrade are presented

MOPPA023	Investigation of INR DTL RF System Operation at 100 Hz Repetition Rate	DTL, cathode, linac, controls	296
	V.L. Serov, A.N. Drugakov, A. Feschenko, A.I. Kvasha, A.N. Naboka RAS/INR, Moscow, Russia
	INR Linac has been operating with 50 Hz beam repetition rate so far. Increasing the repetition rate up to 100 Hz is of importance as it results in doubling of the beam intensity. To solve the task several accelerator systems must be modernized but the most critical one is the DTL rf system (up to 100 MeV). The problems related to the DTL rf system repetition rate increasing are described. One of them is a 50 Hz modulation of a 100 Hz rf pulse sequence. Though the instabilities of accelerating field due to the modulation are reduced by the feedback systems, nevertheless exploration of the effect and its minimizing is of importance. The analysis of the effect is given and the results of experimental studies are presented.

TUPPB017	Multy Frequency Stored Energy RF Linac	linac, acceleration, beam-loading, accelerating-gradient	350
	V.G. Kurakin, P.V. Kurakin LPI, Moscow, Russia
	Due to beam loading, accelerating gradient in rf linac is reduced in time if the energy acquired by charged bunches is not compensated by external generator that feeds the linac. Since the bunch energy gain in this mode of operation correlates strongly with bunch number, the energy spectrum of total bunch train might be corrected in order to suppress this additional spectrum widening. This spectrum control might be achieved with the rf cavity that operates at frequency shifted relative the main one in such a way, that any new bunch sees the cavity field in the appropriate phase correlated with bunch number. The first bunch traverses correcting cavity in field node while the last one in the phase, where the energy acquired by this bunch is equal to resulting bunch train energy spread arising from beam loading effect. Equations of beam - rf cavity interactions are derived followed by coherent beam dynamics exploration in the system described. Measures for suppression of non coherent bunches spectrum widening are suggested leading to insertion additional cavity excited at frequency shifted relative the main and adjacent frequencies. Direct Digital Synthesis technique is suggested as well to provide necessary frequencies and phase's correlations in linac. Advantages of proposed technique as well its possible applications are discussed.

TUPPB018	Simulation of Hollow Ion Beam Formation Line	simulation, target, ion, quadrupole	353
	H.Y. Barminova, N.N. Alexeev, A. Golubev, T. Kulevoy, A. Sitnikov, T. Tretyakova ITEP, Moscow, Russia
	Heavy ion beams can be used for the matter extreme state generation, and forming line must satisfy to certain strict requirements for beam brightness and focus position. In paper* system was proposed for hollow beam formation in order to generate laboratory plasma with energy deposition in cylindrical target. The system is based on the principle of the beam rotation by means of RF-cavities (so called "wobbler"). The similar system is proposed in ITEP**, where the basic part of line consists of two four-cell cavities and focusing quadrupole triplet. To calculate wobbler and magnetic triplet parameters two codes were used – "Transit", developed in ITEP, and G4Beamline, developed in Muons Inc. The beam was simulated for two kinds of particles – multicharged ions of Со and protons with equivalent energy. A comparative analysis of optical system parameter and beam parameter obtained in both simulations was performed. In condition of focus position restriction and spot geometry required aberrations were shown to be taken into account correctly. V. Fortov et al. NIM A 415, p.20 (1998). S. Minaev et al. NIM A 620, р.99 (2010). * S. Kolesnikov et al. High Pressure Research, vol.30, No 1, p.83 (2010).

TUPPB035	The Kicker Parameters Estimation for Longitudinal Instability Damping of the Beam at SR Storage Ring "Siberia-2"	HOM, kicker, synchrotron, storage-ring	394
	A.S. Smygacheva, V. Korchuganov NRC, Moscow, Russia A. Vernov RRC, Moscow, Russia
	RF system of the Kurchatov Institute Synchrotron Radiation storage ring "Siberia-2" consists of three cavities. Each of them has two HOMs tuners. Due to the shunt impedance and quality factor of HOMs are high, the beam-cavity interaction leads to the instability and the beam loss as the result. We have to develop a longitudinal feedback system based on the kicker, to cure the longitudinal instabilities. In the article the investigations of the field spectra of the cavities at the beam energy 450 MeV and 2,5 GeV, excited by the beam and the generator, are presented. According to the measurements of the field spectra of the cavities, the most strong HOMs were found. Main parameters of the kicker such as a frequency, a shunt impedance, a quality factor and a power, were calculated.

TUPPB049	First Test Results of RF Gun for the Race-track Microtron Recuperator of BINP SB RAS	vacuum, electron, gun, microtron	424
	V. Volkov, V.S. Arbuzov, E.I. Gorniker, E.I. Kolobanov, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, V.N. Osipov, V.M. Petrov, A.M. Pilan, M.A. Scheglov, I.K. Sedlyarov, N. Vinokurov BINP SB RAS, Novosibirsk, Russia
	A new electron source for the Race-Track Microtron Recuperator is being developed by BINP SB RAS. It will increase average beam current and brightness of synchrotron radiation. Instead of the static 300kV electron gun operated now we are developing RF gun with the same energy of electrons. This RF gun consists of RF cavity with a gridded thermo cathode mounted on the back wall. RF cavity is driven by a 60 kW generator with last stage equipped by GU101A tetrode tube. Operational frequency of the cavity is 90.2 MHz. It is equal to the second subharmonic of the Microtron RF system frequency. A set of low power electronics controls amplitude of the cavity voltage and its tuner. This system, including a diagnostics beam line, has been installed to serve as a test bench to test the RF cavity and for beam dynamics studies. In continuous regime the designed 300 kV voltages at the acceleration gap is obtained. This paper summarizes the first test results of the cavity in this configuration.

WEPPC001	A Simulation Study on Accelerator Cavities for a SW Linac	impedance, coupling, linac, simulation	445
	N. Khosravi Zanjan University, Zanjan, Iran E.E. Ebrahimibasabi, S.A.H. Feghhi sbu, Tehran, Iran
	An on axis-coupled cavity structure has been studied using S-band microwaves at 2856 MHz, suitable for industrial and research applications. It uses a bi-periodic SW structure with constant impedance that operates at pi/2 mode. This structure consist Kidney-like shaped slots, placed symmetrically with respect to the accelerating axis. We compared Different shapes, places and sizes of slots with respect to coupling coefficient, resonance frequency and some of cavity parameters. Sensitivity analyses of accelerating cavity on details of structure have been done and their behavior, with respect to the resonance frequency has been presented. According to the simulation result using SUPERFISH and CST Studio package, each accelerating cavity is capable to deliver 0.56 MeV to electrons in a 50 mA beam.

WEPPC003	Beam Pulse Separation System of INR Linac	extraction, linac, target, vacuum	451
	V.L. Serov, N.I. Brusova, A. Feschenko, O.V. Grekhov, Y.Z. Kalinin, V.N. Mikhailov, A.A. Stepanov RAS/INR, Moscow, Russia B.O. Bolshakov, A.V. Pozhensky NIIEFA, St. Petersburg, Russia
	The activity for beam intensity increasing and beam use efficiency improvement is under progress in INR linac. An important stage is the development and implementation of the Beam Pulse Separation System in the accelerator intermediate extraction area (160 MeV). The system is intended for distribution the beam pulses between Isotope Production Facility (up to 160 MeV) and the Experimental Facility located downstream of the accelerator exit. The report describes the upgrade of intermediate extraction area as well as the first results of experiments with the beam.

WEPPC004	Maximum Value of the Standing Wave and Travelling Wave Accelerating Structures Electronic Efficiency	electron, radiation, linac, coupling	453
	S. Proskin, A. Kulago MEPhI, Moscow, Russia
	A new theoretical approach for a calculation of the standing wave structure electronic efficiency is described. As a result the electronic efficiency of the biperiodic structure is evaluated regarding a new definition

WEPPC008	Biperiodic Accelerating Structure with Inner Coupling Cells with an Increased Coupling Coefficient	coupling, simulation, multipactoring, linac	458
	M. Gusarova, I.I. Petrushina, E.A. Savin, N.P. Sobenin, D.B. Tikhonov MEPhI, Moscow, Russia
	Results on coupling increase research for biperiodic accelerating structure featuring high effective shunt impedance and other electrodynamical characteristics are presented. Accelerating structure for sample facility was designed taking into consideration thermal issues and multipactor discharge immunity.

WEPPC010	H-Cavity Based Accelerating Structure for Proton Accelerator	impedance, proton, linac, simulation	464
	M.V. Lalayan, A.A. Kalashnikova, S.E. Toporkov MEPhI, Moscow, Russia
	Funding: Work is supported by "scientific stuff" grant of The Ministry of Education and Science of the Russian Federation Cavity for proton accelerator operating in 0.01 to 0.04 phase velocity range optimization results with respect to electrodynamical parameters are presented. H-type based cavity for two operating frequencies 145 MHz and 433 MHz was considered. Influence of cavity shape and dimensions on most important EDCs – relative shunt impedance, quality factor and transient time factor was studied. Influence of high order modes on beam dynamics was considered.

WEPPD004	Longitudinal Stability of ERL with Two Accelerating RF Structures	linac, electron, RF-structure, simulation	575
	Ya.V. Getmanov, O.A. Shevchenko BINP SB RAS, Novosibirsk, Russia N. Vinokurov KAERI, Daejon, Republic of Korea
	Modern Energy Recovery Linac (ERL) projects use superconductive accelerating radio-frequency structures (RF). Their RF quality is typically very high. Therefore, the RF voltage induced by electron beam is also high. In ERL the RF voltage induced by the accelerating beam is almost cancelled by the RF voltage induced by the decelerating beam. But, a small variation of the RF voltage may cause the deviations of the accelerating phases. These deviations then may cause further voltage variation. Thus, the system may be unstable. The stability conditions for ERL with one accelerating structure are well known. The ERL with split RF structure was discussed recently. The stability conditions for such ERLs are discussed in this paper

WEPPD009	Measurement of Speed of Light Emitted by Ultrarelativistic Source	electron, radiation, synchrotron, synchrotron-radiation	584
	A. Stirin, P. Aleksandrov, V. Korchuganov NRC, Moscow, Russia E.B. Aleksandrov IOFFE, St. Petersburg, Russia V.S. Zapasskii Saint-Petersburg State University, Saint-Petersburg, Russia
	Funding: The work was supported by the Russian Fundation for Basic Research under Project No.11-02-00538-а. The paper focuses on the results of experiments on direct measurement of speed of the light emitted by an ultrarelativistic source. The source of synchrotron radiation (SR), Siberia-1 electron storage ring at Kurchatov Institute, was used as a pulsed source of light. Experiments were made on the visible part of the SR emitted by ultrarelativistic electron bunch moving along a curved trajectory in the magnetic field of the bending magnet. The measured value of speed of the light pulse in vacuum coincided with the tabular value of the light speed within 0.5%. Results of the measurements support the second postulate of Einstein's special theory of relativity about independence of speed of light from the source velocity. The paper contains schematic of the experiment, description of its components, main parameters of Siberia-1 electron storage ring and electron bunches. Description of the method of direct measurement of light speed as well as experimental oscillograms and calculation data are also presented.

WEPPD010	Study of Two Cavities Accelerating Module at SR Source Siberia-2	impedance, injection, scattering, beam-loading	587
	V.I. Moiseev, V. Korchuganov, A.S. Smygacheva, A. Vernov NRC, Moscow, Russia
	SR source Siberia-2 RF system includes an accelerating module consisting of two 181 MHz cavities powered by one amplifier. Some problem occured now is the accelerating voltage instubility under high beam currents conditions. The phase shift between the voltages at cavities causes the asymmetry in beam loading and detuning of cavities. To study the performances of accelerating module, the analytical description has been developed. The whole system can be characterized by seven parameters. These base parameters give the relations of voltages and currents in system. Measurements determine the real values of the base parameters. Set of non linear equations recived can be reduced to the voltages and currents in system as the functions of beam current and energy. The results can be applied to injection and ramping in Siberia-2.

WEPPD012	Standing Wave RF Deflectors with Reduced Aberrations	impedance, emittance, diagnostics, controls	590
	V.V. Paramonov, L.V. Kravchuk, P. Orlov RAS/INR, Moscow, Russia K. Flöttmann DESY, Hamburg, Germany
	Funding: in part RBFR N 12-02-00654-a Deflecting structures are now widely used for bunch phase space manipulations either with bunch rotation for special bunch diagnostic or in emittance exchange experiments. Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide non linear additives in the field distribution, leading to emittance growth during phase space manipulation. Standing wave operation is more RF efficient for short deflectors. The criterion of the field quality estimation and results is of deflecting structure consideration for minimization of non linear additives are presented. The solutions for dispersion correction together with end cells optimization are described too.

WEPPD013	Inverse Compton Sources on the Basis of Electron Accelerators with Beam Energy Recovery	electron, linac, photon, FEL	593
	V.G. Kurakin, P.V. Kurakin LPI, Moscow, Russia
	In inverse Compton Source, photons in Roentgen range originate from visible light laser photons scattered back on electrons with the energy of dozens MeV. Several schemes are suggested in the paper, beam energy recovery conception being the common idea of all of them. The first one is based on synchrotron with flat part of guiding magnetic field. Being accelerated, electron bunch interacts with photon bunch of free electron laser mounted on straight paths of the accelerator, then is decelerated during falling down period of magnetic field cycle, and extracted at low energy from synchrotron to absorb in beam dump. This measure decreases background that originates from bremsstrahlung of lost electrons inherent to classical schema with linear accelerator and storage ring. Two other schemes use superconducting linac that produces relativistic electron bunches which energy is recovered after use, free electron laser (FEL) driven by bunches from linac being used to produce photons bunches for source. In one scheme the same electron bunches are use to drive FEL and inverse Compton Source, while in the other one beam splitting technique is suggested. It is based on beam energy modulation with subsequent separation of successive bunches. The expected self excitation inverse Compton sources parameters are estimated followed by critical issues discussion for all schemes suggested.

WEPPD023	Dubna-Minsk Activity on the Development of 1.3 GHz Superconducting Single-Cell RF-cavity	niobium, electron, cryogenics, vacuum	602
	N.S. Azaryan, Ju. Boudagov, D.L. Demin, G. Shirkov JINR, Dubna, Moscow Region, Russia M.A. Baturitsky NC PHEP BSU, Minsk, Belarus S.E. Demyanov, E.Yu. Kaniukov Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus, Minsk, Belarus V.A. Karpovich, N.V. Liubetsky BSU, Minsk, Belarus R.D. Kephart, L. Ristori Fermilab, Batavia, USA S.V. Kolosov, A.A. Kurayev, A.K. Sinitsyn Belarus State University of Informatics and Radioelectronics (BSUIR), Minsk, Belarus S.I. Maximov, V.N. Rodionova Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, S.V. Yurevich, A.Yu. Zhuravsky Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
	In 2011 Dubna-Minsk collaboration started an activity on the development and manufacture the series of superconducting niobium cavities in the enterprises in Belarus. First results of this work are presented. Simulation code was developed to compute EM characteristics, and to calculate the shape and geometric dimensions of SC niobium RF-cavity taking into account higher order oscillations modes. The calculations of a single-cell and 9-cell cavity were made: the found ratio of the maximum electric field on the cavity axis to an average accelerating field is 2 within 1%; the found geometric factor equals 283 Ohm. Half-cells will be made by hydraulic deep drawing and welded by electron-beam (EBW). A stamping tool for hydraulic deep drawing of the half-cells and a set of technological tools for probing of EBW of two half-cells have been designed. Mechanical properties of niobium and model material (Cu, Al) were investigated. Cryogenic system for low temperature RF tests of the SC single-cell cavity was successfully tested at 4.2 K. Coupling device for RF measurement of the single-cell SC niobium cavity was synthesized and manufactured – the measured standing wave ratio is about 1.01-1.07. Warm RF tests with etalon single-cell cavity were made: fundamental frequency – 1.273 GHz, quality factor (warm) – 28·10³.

WEPPD054	Some Aspects of the Cavity Resonant Frequency Control System Heater Operating Point Choice	linac, controls, acceleration, DTL	665
	V.V. Grechko, G.I. Yamshikov RAS/INR, Moscow, Russia
	To adjust and to stabilize a resonant frequency of the accelerating cavities INR Linac comprises a Cavity Resonant Frequency Control System (CRFCS). The main final control element of the system is an electric heater (EH). Operating point of EH determines power consumption of the system and rf power feed in duration. Electromagnetic noise originated from thyristor regulators of the heaters and influencing linac electronics also depends on the operating point. One of the most sensitive systems is Fast Beam Interlock System (FBIS) intended for prevention of excessive activation and damage of linac components. To exclude false responses of FBIS and to decrease power consumption of CRFCS operating point of the heater has been shifted to a range of smaller power. This approach has been tested during several beam runs with the following results: no false responses of FRIB were observed; the quality of frequency stabilization during beam runs remained at the same level; relatively rare restarts of RF channels did not increase a downtime to beam time ratio; CRFCS power consumption was decreased twice. The rf power feed in duration increased insignificantly.

WEPPD057	Commissioning of New Diagnostic Devices at PITZ	electron, emittance, booster, quadrupole	674
	D. Malyutin, M. Krasilnikov, J. Meissner, F. Stephan, G. Vashchenko DESY Zeuthen, Zeuthen, Germany K. Kusoljariyakul, S. Rimjaem Chiang Mai University, Chiang Mai, Thailand
	The Photo Injector Test facility at DESY, Zeuthen site (PITZ) is the test stand of the electron source for the European X-ray Free Electron Laser (XFEL). The main goal of the facility is the detailed characterization of the electron bunch parameters produced by the RF photo-cathode gun. Characterization of the bunch longitudinal properties such as bunch length or longitudinal phase space earlier was done using a streak camera, which measures the Cherenkov light produced by electron bunches passing through aerogel radiators. Recently, a Transverse Deflecting Structure (TDS) and a Second High Energy Dispersive Arm (HEDA2) were installed in the PITZ beamline. They will enable time resolved measurements of the electron bunch with much better time resolution than the streak camera system. The first results of the commissioning of the HEDA2 section at PITZ are presented in this contribution.

Paper

Title

Other Keywords

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WEYCH02

Multipurpose Research Complex Based on the INR High Intensity Proton Linac

linac, DTL, proton, neutron

90

L.V. Kravchuk, A. Feschenko, M.I. Grachev, V.L. Serov
RAS/INR, Moscow, Russia

Funding: Russian Academy of Science
Scientific Complex based on the 600 MeV Proton Linac is under operation at the INR, Troitsk, Moscow to provide both basic and applied research. At the moment proton beam from the Linac with energy about 210 MeV and average current about 130 μA is transporting to the Experimental Area to be use for following facilities: three Spallation Neutron sources, the Isotope Production facility and the Beam Therapy complex. Status of the Linac and Experimental Area as well as the tuning procedures to decrease particle loss in high-intensity mode of operation are given in the paper.

Slides WEYCH02 [2.281 MB]

THAOR06

Update on SCRF Development at TRIUMF

TRIUMF, linac, HOM, cryomodule

152

V. Zvyagintsev, B. Amini, K. Fong, P.R. Harmer, D. Kishi, P. Kolb, A. Koveshnikov, D. Lang, R.E. Laxdal, A.K. Mitra, N. Muller, C. Schaub, R.W. Shanks, B.S. Waraich, Q. Zheng
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
S.H. Abidi, R.S. Orr
University of Toronto, Toronto, Ontario, Canada
R. Edinger
PAVAC, Richmond, B.C., Canada
M. Gusarova, I.I. Petrushina, N.P. Sobenin, D.B. Tikhonov
MEPhI, Moscow, Russia
A. Vrielink
UBC, Vancouver, B.C., Canada

Since 2007 TRIUMF started development of eLINAC which is a 50 MeV 10 mA CW electron superconducting linear accelerator to be used as a driver to produce radioactive ion beams through photofission. The accelerator is based on five 1.3 GHz TTF/ILC elliptical bulk Nb cavities technology to be mounted in three cryomodules; an injector cryomodule with one cavity and two accelerating modules with two cavities each. The ISAC-II project superconducting heavy ion linear accelerator was successfully completed in 2010 and we now have in operation 40 superconducting bulk Nb QWR cavities assembled in eight cryomodules. Results and plans of the SCRF program and experience of ISAC-II operation at TRIUMF will be discussed.

Slides THAOR06 [3.309 MB]

THCCH02

Characteristics of the Model of Linear Accelerator Based on Parallel Coupled Accelerating Structure with Beam Loading

electron, beam-loading, injection, gun

164

Y.D. Chernousov
ICKC, Novosibirsk, Russia
A.M. Barnyakov, A.E. Levichev, V.M. Pavlov
BINP SB RAS, Novosibirsk, Russia
V. Ivannikov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

The 5-cavity model of linear accelerator based on the parallel coupled accelerating structure (LAPCAS) is under study. Linear accelerator is equipped with focusing system based on permanent magnet and three-electrode gun with RF control. The work of accelerator with electron beam is demonstrated. The parameters of short pulses mode are following: electron energy - 4 MeV, pulse current - 0.3 A, pulse duration - 2.5 ns; the parameters of long pulses mode are following: energy - 2.5 MeV, pulse current - 0. 1A, pulse duration - 0.1 - 4 us. Working frequency of the accelerator is 2.45 GHz. In RF-controlled mode the capture of about 100% is demonstrated. The beam loading effect is observed. The compensation of energy spread of accelerated electrons by delaying the moment of injection in the LAPCAS is demonstrated. The equations of transient process in the accelerating cavity which is powered by an external RF generator and excited by electron bunches in a simple form are presented.

Slides THCCH02 [1.154 MB]

MOPPA018

Localization of the RF Breakdown in the Parallel Coupled Accelerating Structure

coupling, acceleration, electron, collider

281

Y.D. Chernousov, A.M. Barnyakov, A.E. Levichev, V.M. Pavlov
BINP SB RAS, Novosibirsk, Russia
V. Ivannikov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

Parallel coupled accelerating structures (PCAS) with parallel RF power feeding of accelerating cavities has some features and advantages in compare with conventional traveling wave and standing wave structures with sequential RF power feeding. Parallel feeding of accelerating cavities minimizes the RF power flow via coupling slot and determines individual behavior of each cell in the regime of RF breakdown. These features can be used for developing of high gradient accelerating structures. The experimental data of the breakdown modes in the PCAS are presented.

MOPPA019

RF Antenna Lead

high-voltage, radiation, electron, simulation

284

A.M. Barnyakov, A.E. Levichev
BINP SB RAS, Novosibirsk, Russia
Y.D. Chernousov
ICKC, Novosibirsk, Russia
V. Ivannikov, I.V. Shebolaev
ICKC SB RAS, Novosibirsk, Russia

RF antenna lead is described. This lead is used for RF power input to high voltage electrodes. The device consists of receiving and transmitting antennas realized as symmetrical parts of coaxial cavity with dielectric disk between the parts. Main operating characteristics are the following: high voltage is over 60 kV, coefficient of transmission at the operating frequency is over 0.97, bandpass is over 70% (at the level of -3dB). The scheme of the device, principle of work and measured results are presented.

MOPPA020

Multipactor Discharge in eLINAC Accelerator

accelerating-gradient, simulation, TRIUMF, multipactoring

287

M. Gusarova, I.I. Petrushina
MEPhI, Moscow, Russia
V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

This paper concerns numerical simulations and experimental investigation of multipacting discharge in accelerating cavities and feeding waveguide section of eLINAC accelerator. The threshold values of accelerating gradient and input power for discharge may occur in these structures have been obtained experimentally and compared to numerical predictions. Secondary emission influence on discharge behavior were also considered.

MOPPA022

Status of INR DTL RF System

DTL, linac, vacuum, cathode

293

A.I. Kvasha, A. Feschenko, V.L. Serov
RAS/INR, Moscow, Russia

INR Linac is in regular operation since 1993. The accelerator incorporates DTL and DAW structures operating at 198.2 MHz and 991 MHz correspondingly. Initially two types of high power vacuum tubes specially designed for INR linac (GI-54A for final amplifier and GI-51A for intermediate amplifier) were used in DTL RF power system. However production of these tubes has been terminated resulting in a need of DTL RF system upgrade. The main goal of the recent upgrade is replacement of the old tubes by modern ones. The difficulty of replacement arises due to a need to minimize mechanical changes of the existing equipment. Another goal is improving of operational reliability. The reliability depends on vacuum tube reliability and to a large extent - on crowbar operation. The results and the experience of INR DTL RF system upgrade are presented

MOPPA023

Investigation of INR DTL RF System Operation at 100 Hz Repetition Rate

DTL, cathode, linac, controls

296

V.L. Serov, A.N. Drugakov, A. Feschenko, A.I. Kvasha, A.N. Naboka
RAS/INR, Moscow, Russia

INR Linac has been operating with 50 Hz beam repetition rate so far. Increasing the repetition rate up to 100 Hz is of importance as it results in doubling of the beam intensity. To solve the task several accelerator systems must be modernized but the most critical one is the DTL rf system (up to 100 MeV). The problems related to the DTL rf system repetition rate increasing are described. One of them is a 50 Hz modulation of a 100 Hz rf pulse sequence. Though the instabilities of accelerating field due to the modulation are reduced by the feedback systems, nevertheless exploration of the effect and its minimizing is of importance. The analysis of the effect is given and the results of experimental studies are presented.

TUPPB017

Multy Frequency Stored Energy RF Linac

linac, acceleration, beam-loading, accelerating-gradient

350

V.G. Kurakin, P.V. Kurakin
LPI, Moscow, Russia

Due to beam loading, accelerating gradient in rf linac is reduced in time if the energy acquired by charged bunches is not compensated by external generator that feeds the linac. Since the bunch energy gain in this mode of operation correlates strongly with bunch number, the energy spectrum of total bunch train might be corrected in order to suppress this additional spectrum widening. This spectrum control might be achieved with the rf cavity that operates at frequency shifted relative the main one in such a way, that any new bunch sees the cavity field in the appropriate phase correlated with bunch number. The first bunch traverses correcting cavity in field node while the last one in the phase, where the energy acquired by this bunch is equal to resulting bunch train energy spread arising from beam loading effect. Equations of beam - rf cavity interactions are derived followed by coherent beam dynamics exploration in the system described. Measures for suppression of non coherent bunches spectrum widening are suggested leading to insertion additional cavity excited at frequency shifted relative the main and adjacent frequencies. Direct Digital Synthesis technique is suggested as well to provide necessary frequencies and phase's correlations in linac. Advantages of proposed technique as well its possible applications are discussed.

TUPPB018

Simulation of Hollow Ion Beam Formation Line

simulation, target, ion, quadrupole

353

H.Y. Barminova, N.N. Alexeev, A. Golubev, T. Kulevoy, A. Sitnikov, T. Tretyakova
ITEP, Moscow, Russia

Heavy ion beams can be used for the matter extreme state generation*, and forming line must satisfy to certain strict requirements for beam brightness and focus position. In paper** system was proposed for hollow beam formation in order to generate laboratory plasma with energy deposition in cylindrical target. The system is based on the principle of the beam rotation by means of RF-cavities (so called "wobbler"). The similar system is proposed in ITEP***, where the basic part of line consists of two four-cell cavities and focusing quadrupole triplet. To calculate wobbler and magnetic triplet parameters two codes were used – "Transit", developed in ITEP, and G4Beamline, developed in Muons Inc. The beam was simulated for two kinds of particles – multicharged ions of Со and protons with equivalent energy. A comparative analysis of optical system parameter and beam parameter obtained in both simulations was performed. In condition of focus position restriction and spot geometry required aberrations were shown to be taken into account correctly.
* V. Fortov et al. NIM A 415, p.20 (1998).
** S. Minaev et al. NIM A 620, р.99 (2010).
*** S. Kolesnikov et al. High Pressure Research, vol.30, No 1, p.83 (2010).

TUPPB035

The Kicker Parameters Estimation for Longitudinal Instability Damping of the Beam at SR Storage Ring "Siberia-2"

HOM, kicker, synchrotron, storage-ring

394

A.S. Smygacheva, V. Korchuganov
NRC, Moscow, Russia
A. Vernov
RRC, Moscow, Russia

RF system of the Kurchatov Institute Synchrotron Radiation storage ring "Siberia-2" consists of three cavities. Each of them has two HOMs tuners. Due to the shunt impedance and quality factor of HOMs are high, the beam-cavity interaction leads to the instability and the beam loss as the result. We have to develop a longitudinal feedback system based on the kicker, to cure the longitudinal instabilities. In the article the investigations of the field spectra of the cavities at the beam energy 450 MeV and 2,5 GeV, excited by the beam and the generator, are presented. According to the measurements of the field spectra of the cavities, the most strong HOMs were found. Main parameters of the kicker such as a frequency, a shunt impedance, a quality factor and a power, were calculated.

TUPPB049

First Test Results of RF Gun for the Race-track Microtron Recuperator of BINP SB RAS

vacuum, electron, gun, microtron

424

V. Volkov, V.S. Arbuzov, E.I. Gorniker, E.I. Kolobanov, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, V.N. Osipov, V.M. Petrov, A.M. Pilan, M.A. Scheglov, I.K. Sedlyarov, N. Vinokurov
BINP SB RAS, Novosibirsk, Russia

A new electron source for the Race-Track Microtron Recuperator is being developed by BINP SB RAS. It will increase average beam current and brightness of synchrotron radiation. Instead of the static 300kV electron gun operated now we are developing RF gun with the same energy of electrons. This RF gun consists of RF cavity with a gridded thermo cathode mounted on the back wall. RF cavity is driven by a 60 kW generator with last stage equipped by GU101A tetrode tube. Operational frequency of the cavity is 90.2 MHz. It is equal to the second subharmonic of the Microtron RF system frequency. A set of low power electronics controls amplitude of the cavity voltage and its tuner. This system, including a diagnostics beam line, has been installed to serve as a test bench to test the RF cavity and for beam dynamics studies. In continuous regime the designed 300 kV voltages at the acceleration gap is obtained. This paper summarizes the first test results of the cavity in this configuration.

WEPPC001

A Simulation Study on Accelerator Cavities for a SW Linac

impedance, coupling, linac, simulation

445

N. Khosravi
Zanjan University, Zanjan, Iran
E.E. Ebrahimibasabi, S.A.H. Feghhi
sbu, Tehran, Iran

An on axis-coupled cavity structure has been studied using S-band microwaves at 2856 MHz, suitable for industrial and research applications. It uses a bi-periodic SW structure with constant impedance that operates at pi/2 mode. This structure consist Kidney-like shaped slots, placed symmetrically with respect to the accelerating axis. We compared Different shapes, places and sizes of slots with respect to coupling coefficient, resonance frequency and some of cavity parameters. Sensitivity analyses of accelerating cavity on details of structure have been done and their behavior, with respect to the resonance frequency has been presented. According to the simulation result using SUPERFISH and CST Studio package, each accelerating cavity is capable to deliver 0.56 MeV to electrons in a 50 mA beam.

WEPPC003

Beam Pulse Separation System of INR Linac

extraction, linac, target, vacuum

451

V.L. Serov, N.I. Brusova, A. Feschenko, O.V. Grekhov, Y.Z. Kalinin, V.N. Mikhailov, A.A. Stepanov
RAS/INR, Moscow, Russia
B.O. Bolshakov, A.V. Pozhensky
NIIEFA, St. Petersburg, Russia

The activity for beam intensity increasing and beam use efficiency improvement is under progress in INR linac. An important stage is the development and implementation of the Beam Pulse Separation System in the accelerator intermediate extraction area (160 MeV). The system is intended for distribution the beam pulses between Isotope Production Facility (up to 160 MeV) and the Experimental Facility located downstream of the accelerator exit. The report describes the upgrade of intermediate extraction area as well as the first results of experiments with the beam.

WEPPC004

Maximum Value of the Standing Wave and Travelling Wave Accelerating Structures Electronic Efficiency

electron, radiation, linac, coupling

453

S. Proskin, A. Kulago
MEPhI, Moscow, Russia

A new theoretical approach for a calculation of the standing wave structure electronic efficiency is described. As a result the electronic efficiency of the biperiodic structure is evaluated regarding a new definition

WEPPC008

Biperiodic Accelerating Structure with Inner Coupling Cells with an Increased Coupling Coefficient

coupling, simulation, multipactoring, linac

458

M. Gusarova, I.I. Petrushina, E.A. Savin, N.P. Sobenin, D.B. Tikhonov
MEPhI, Moscow, Russia

Results on coupling increase research for biperiodic accelerating structure featuring high effective shunt impedance and other electrodynamical characteristics are presented. Accelerating structure for sample facility was designed taking into consideration thermal issues and multipactor discharge immunity.

WEPPC010

H-Cavity Based Accelerating Structure for Proton Accelerator

impedance, proton, linac, simulation

464

M.V. Lalayan, A.A. Kalashnikova, S.E. Toporkov
MEPhI, Moscow, Russia

Funding: Work is supported by "scientific stuff" grant of The Ministry of Education and Science of the Russian Federation
Cavity for proton accelerator operating in 0.01 to 0.04 phase velocity range optimization results with respect to electrodynamical parameters are presented. H-type based cavity for two operating frequencies 145 MHz and 433 MHz was considered. Influence of cavity shape and dimensions on most important EDCs – relative shunt impedance, quality factor and transient time factor was studied. Influence of high order modes on beam dynamics was considered.

WEPPD004

Longitudinal Stability of ERL with Two Accelerating RF Structures

linac, electron, RF-structure, simulation

575

Ya.V. Getmanov, O.A. Shevchenko
BINP SB RAS, Novosibirsk, Russia
N. Vinokurov
KAERI, Daejon, Republic of Korea

Modern Energy Recovery Linac (ERL) projects use superconductive accelerating radio-frequency structures (RF). Their RF quality is typically very high. Therefore, the RF voltage induced by electron beam is also high. In ERL the RF voltage induced by the accelerating beam is almost cancelled by the RF voltage induced by the decelerating beam. But, a small variation of the RF voltage may cause the deviations of the accelerating phases. These deviations then may cause further voltage variation. Thus, the system may be unstable. The stability conditions for ERL with one accelerating structure are well known. The ERL with split RF structure was discussed recently. The stability conditions for such ERLs are discussed in this paper

WEPPD009

Measurement of Speed of Light Emitted by Ultrarelativistic Source

electron, radiation, synchrotron, synchrotron-radiation

584

A. Stirin, P. Aleksandrov, V. Korchuganov
NRC, Moscow, Russia
E.B. Aleksandrov
IOFFE, St. Petersburg, Russia
V.S. Zapasskii
Saint-Petersburg State University, Saint-Petersburg, Russia

Funding: The work was supported by the Russian Fundation for Basic Research under Project No.11-02-00538-а.
The paper focuses on the results of experiments on direct measurement of speed of the light emitted by an ultrarelativistic source. The source of synchrotron radiation (SR), Siberia-1 electron storage ring at Kurchatov Institute, was used as a pulsed source of light. Experiments were made on the visible part of the SR emitted by ultrarelativistic electron bunch moving along a curved trajectory in the magnetic field of the bending magnet. The measured value of speed of the light pulse in vacuum coincided with the tabular value of the light speed within 0.5%. Results of the measurements support the second postulate of Einstein's special theory of relativity about independence of speed of light from the source velocity. The paper contains schematic of the experiment, description of its components, main parameters of Siberia-1 electron storage ring and electron bunches. Description of the method of direct measurement of light speed as well as experimental oscillograms and calculation data are also presented.

WEPPD010

Study of Two Cavities Accelerating Module at SR Source Siberia-2

impedance, injection, scattering, beam-loading

587

V.I. Moiseev, V. Korchuganov, A.S. Smygacheva, A. Vernov
NRC, Moscow, Russia

SR source Siberia-2 RF system includes an accelerating module consisting of two 181 MHz cavities powered by one amplifier. Some problem occured now is the accelerating voltage instubility under high beam currents conditions. The phase shift between the voltages at cavities causes the asymmetry in beam loading and detuning of cavities. To study the performances of accelerating module, the analytical description has been developed. The whole system can be characterized by seven parameters. These base parameters give the relations of voltages and currents in system. Measurements determine the real values of the base parameters. Set of non linear equations recived can be reduced to the voltages and currents in system as the functions of beam current and energy. The results can be applied to injection and ramping in Siberia-2.

WEPPD012

Standing Wave RF Deflectors with Reduced Aberrations

impedance, emittance, diagnostics, controls

590

V.V. Paramonov, L.V. Kravchuk, P. Orlov
RAS/INR, Moscow, Russia
K. Flöttmann
DESY, Hamburg, Germany

Funding: in part RBFR N 12-02-00654-a
Deflecting structures are now widely used for bunch phase space manipulations either with bunch rotation for special bunch diagnostic or in emittance exchange experiments. Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide non linear additives in the field distribution, leading to emittance growth during phase space manipulation. Standing wave operation is more RF efficient for short deflectors. The criterion of the field quality estimation and results is of deflecting structure consideration for minimization of non linear additives are presented. The solutions for dispersion correction together with end cells optimization are described too.

WEPPD013

Inverse Compton Sources on the Basis of Electron Accelerators with Beam Energy Recovery

electron, linac, photon, FEL

593

V.G. Kurakin, P.V. Kurakin
LPI, Moscow, Russia

In inverse Compton Source, photons in Roentgen range originate from visible light laser photons scattered back on electrons with the energy of dozens MeV. Several schemes are suggested in the paper, beam energy recovery conception being the common idea of all of them. The first one is based on synchrotron with flat part of guiding magnetic field. Being accelerated, electron bunch interacts with photon bunch of free electron laser mounted on straight paths of the accelerator, then is decelerated during falling down period of magnetic field cycle, and extracted at low energy from synchrotron to absorb in beam dump. This measure decreases background that originates from bremsstrahlung of lost electrons inherent to classical schema with linear accelerator and storage ring. Two other schemes use superconducting linac that produces relativistic electron bunches which energy is recovered after use, free electron laser (FEL) driven by bunches from linac being used to produce photons bunches for source. In one scheme the same electron bunches are use to drive FEL and inverse Compton Source, while in the other one beam splitting technique is suggested. It is based on beam energy modulation with subsequent separation of successive bunches. The expected self excitation inverse Compton sources parameters are estimated followed by critical issues discussion for all schemes suggested.

WEPPD023

Dubna-Minsk Activity on the Development of 1.3 GHz Superconducting Single-Cell RF-cavity

niobium, electron, cryogenics, vacuum

602

N.S. Azaryan, Ju. Boudagov, D.L. Demin, G. Shirkov
JINR, Dubna, Moscow Region, Russia
M.A. Baturitsky
NC PHEP BSU, Minsk, Belarus
S.E. Demyanov, E.Yu. Kaniukov
Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus, Minsk, Belarus
V.A. Karpovich, N.V. Liubetsky
BSU, Minsk, Belarus
R.D. Kephart, L. Ristori
Fermilab, Batavia, USA
S.V. Kolosov, A.A. Kurayev, A.K. Sinitsyn
Belarus State University of Informatics and Radioelectronics (BSUIR), Minsk, Belarus
S.I. Maximov, V.N. Rodionova
Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus
V.S. Petrakovsky, I.L. Pobol, A.I. Pokrovsky, S.V. Yurevich, A.Yu. Zhuravsky
Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus

In 2011 Dubna-Minsk collaboration started an activity on the development and manufacture the series of superconducting niobium cavities in the enterprises in Belarus. First results of this work are presented. Simulation code was developed to compute EM characteristics, and to calculate the shape and geometric dimensions of SC niobium RF-cavity taking into account higher order oscillations modes. The calculations of a single-cell and 9-cell cavity were made: the found ratio of the maximum electric field on the cavity axis to an average accelerating field is 2 within 1%; the found geometric factor equals 283 Ohm. Half-cells will be made by hydraulic deep drawing and welded by electron-beam (EBW). A stamping tool for hydraulic deep drawing of the half-cells and a set of technological tools for probing of EBW of two half-cells have been designed. Mechanical properties of niobium and model material (Cu, Al) were investigated. Cryogenic system for low temperature RF tests of the SC single-cell cavity was successfully tested at 4.2 K. Coupling device for RF measurement of the single-cell SC niobium cavity was synthesized and manufactured – the measured standing wave ratio is about 1.01-1.07. Warm RF tests with etalon single-cell cavity were made: fundamental frequency – 1.273 GHz, quality factor (warm) – 28·10³.

WEPPD054

Some Aspects of the Cavity Resonant Frequency Control System Heater Operating Point Choice

linac, controls, acceleration, DTL

665

V.V. Grechko, G.I. Yamshikov
RAS/INR, Moscow, Russia

To adjust and to stabilize a resonant frequency of the accelerating cavities INR Linac comprises a Cavity Resonant Frequency Control System (CRFCS). The main final control element of the system is an electric heater (EH). Operating point of EH determines power consumption of the system and rf power feed in duration. Electromagnetic noise originated from thyristor regulators of the heaters and influencing linac electronics also depends on the operating point. One of the most sensitive systems is Fast Beam Interlock System (FBIS) intended for prevention of excessive activation and damage of linac components. To exclude false responses of FBIS and to decrease power consumption of CRFCS operating point of the heater has been shifted to a range of smaller power. This approach has been tested during several beam runs with the following results: no false responses of FRIB were observed; the quality of frequency stabilization during beam runs remained at the same level; relatively rare restarts of RF channels did not increase a downtime to beam time ratio; CRFCS power consumption was decreased twice. The rf power feed in duration increased insignificantly.

WEPPD057

Commissioning of New Diagnostic Devices at PITZ

electron, emittance, booster, quadrupole

674

D. Malyutin, M. Krasilnikov, J. Meissner, F. Stephan, G. Vashchenko
DESY Zeuthen, Zeuthen, Germany
K. Kusoljariyakul, S. Rimjaem
Chiang Mai University, Chiang Mai, Thailand

The Photo Injector Test facility at DESY, Zeuthen site (PITZ) is the test stand of the electron source for the European X-ray Free Electron Laser (XFEL). The main goal of the facility is the detailed characterization of the electron bunch parameters produced by the RF photo-cathode gun. Characterization of the bunch longitudinal properties such as bunch length or longitudinal phase space earlier was done using a streak camera, which measures the Cherenkov light produced by electron bunches passing through aerogel radiators. Recently, a Transverse Deflecting Structure (TDS) and a Second High Energy Dispersive Arm (HEDA2) were installed in the PITZ beamline. They will enable time resolved measurements of the electron bunch with much better time resolution than the streak camera system. The first results of the commissioning of the HEDA2 section at PITZ are presented in this contribution.