RUPAC2012 - List of Keywords (emittance)

Paper	Title	Other Keywords	Page
MOACH02	Design and Simulation of Practical Alternating-Phase-Focused (APF) Linacs – Synthesis and Extension in Tribute to Pioneering Russian APF Research	linac, focusing, acceleration, ion	12
	R.A. Jameson IAP, Frankfurt am Main, Germany
	Conventional magnetic transverse focusing in conventional linacs represents a high fraction of their cost and complexity. Both transverse and longitudinal focusing can be obtained from the rf field by using the strong-focusing effect of alternating patterns (sequences) of gap phases and amplitudes – known as Alternating-Phase-Focusing (APF). Although studied for decades, the difficulty of designing suitable sequences has inhibited APF adoption, although short sequence APFs are now used in a number of practical applications. Synthesis of reported details and new physics and technique result in a new, general and efficient method for designing APF linacs. Very long sequences with high energy gain factors are demonstrated, e.g. for acceleration of very cold muons from ~0.340-200MeV (factor 600).
	Slides MOACH02 [0.616 MB]

MOBCH01	Storage, Acceleration and Short Bunched Beam Formation of 197Au+79 Ions in the NICA Collider	ion, acceleration, collider, accumulation	30
	A.V. Eliseev, A.V. Smirnov JINR, Dubna, Moscow Region, Russia T. Katayama GSI, Darmstadt, Germany E. Kenzhbulatov, G.Y. Kurkin, V.M. Petrov, V. Volkov BINP SB RAS, Novosibirsk, Russia O.S. Kozlov, A.O. Sidorin, G.V. Trubnikov JINR/VBLHEP, Dubna, Moscow region, Russia I.N. Meshkov JINR/DLNP, Dubna, Moscow region, Russia
	The regimes of high intensity beam of 197Au⁷⁹⁺ ions in NICA Collider is considered. The first stage – ion storage is proposed to be performed with Barrier Bucket technique at ion energy of 1–3 GeV/u. Experiments in collider mode in this energy range can be performed at injection energy. For experiments at higher, up to 4.5 GeV/u, energy ions are accelerated with the same BB method. Formation of bunched beam is fulfilled in two steps – first, at 24th harmonics and then, final formation, at 72th harmonics of RF system. The possibility of achievement of designed bunch parameters is shown.
	Slides MOBCH01 [0.807 MB]

TUCCH02	Beam Dynamics Investigations for 433 MHz RFQ Accelerator	rfq, focusing, ion, injection	82
	Y.A. Svistunov NIIEFA, St. Petersburg, Russia A.P. Durkin MRTI RAS, Moscow, Russia A.D. Ovsyannikov St. Petersburg State University, St. Petersburg, Russia
	Modeling results for deuteron dynamics in RFQ structure with operational frequency 433 MHz and 1 MeV output energy are presented. The results are compared with experimental data. The purpose of investigation is to find optimal input RFQ emittance parameters for off-nominal values of input current and vane voltage.
	Slides TUCCH02 [0.642 MB]

MOPPA005	Laser-Wakefield Acceleration with External Bunch Injection at REGAE	plasma, laser, electron, injection	254
	J. Grebenyuk, K. Flöttmann DESY, Hamburg, Germany T. Mehrling, J. Osterhoff Uni HH, Hamburg, Germany
	Funding: Helmholtz Alliance Short and highly intense laser pulses focused into a gas target, ionise the gas and may excite large amplitude plasma waves that support extreme electric fields (>10 GV/m) for acceleration of charged particles. The REGAE facility at DESY, which provides 2-5 MeV of ~10 fs bunches, offers the unique possibility to study the external injection of pre-accelerated electron bunches from a conventional accelerator, and their subsequent acceleration in plasma wakefields. Simulations were performed with the particle-in-cell code OSIRIS, showing a wide variety of effects which can be explored in the future at REGAE. External controlled injection allows to study effects which require precise information about the beam quality, position and momentum at the initial point of injection. Topics of a particular interest are: bunch emittance growth suppression, controlled betatron motion, and longitudinal bunch compression.

TUPPB007	Transfer Channel from Booster to Nuclotron at the NICA Facility	ion, booster, quadrupole, simulation	322
	G.A. Filatov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, N.D. Topilin, G.V. Trubnikov, A. Tuzikov JINR, Dubna, Moscow Region, Russia
	In the last years the Nuclotron-based Ion Collider fAcility (NICA) project is developed at Joint Institute for Nuclear Research (JINR), Dubna, Russia. Important elements of the NICA are two synchrotrons: Booster and Nuclotron. Connection between these synchrotrons is provided with the transfer channel for heavy ions at energy of 600 MeV/u. The transfer channel includes a stripping station and charge separation system. General goal of the optic design is to minimize emittance at the exit of the channel. Magnetic system of the channel will be constructed using magnets of the Nuclotron type.

TUPPB011	Analytical Approach for Beam Matching	linac, ion, simulation, controls	334
	V.S. Dyubkov, S.M. Polozov MEPhI, Moscow, Russia
	Charge particle beams transportation with small cross-sections and low energies is an actual problem for a gantry. That beams are used actively for isotope therapy. Beam emittance is its quality factor, and it should be matched with a facility channel acceptance. The method for beam dynamics analysis in lattice is developed in terms of non-coherent particle oscillation study. Nonlinear beam dynamics is investigated by using this method. It is shown that this technique allows one to realize effective beam emittance control. Analytical results obtained are verified by means of numerical simulation.

TUPPB022	Mathematical Model of Beam Dynamic Optimization	focusing, DTL, controls, linac	361
	V.V. Altsybeyev St. Petersburg State University, St. Petersburg, Russia
	We treat here the process of simulation of charged particle dynamics using so called hybrid system. Hybrid system is a system with continuous and discrete parts, described by differential and difference equations, respectively. In this case new mathematical model of beam dynamics optimization is suggested. The main parameters of optimization are: coefficient of particle capture in the acceleration mode, phase and energy spectra of particles at the exit of the accelerator, the transverse beam characteristics, etc. Optimization was carried out for the drift tubes accelerator.

TUPPB024	Development of the Object-oriented Program in C ++ for Simulation of Beam Dynamics in Accelerator Injection Systems	injection, simulation, controls, focusing	364
	S.A. Kozynchenko St. Petersburg State University, St. Petersburg, Russia
	At present, more and more attention is paid to the design and creation of accelerator systems for precision beams. Their injection systems in many aspects determine the output characteristics of the beam, so the questions of the design of such systems are of great importance. In such cases both simulation and optimization of beam dynamics in electromagnetic fields close to real may be necessary. In this paper the program for simulation and optimization of beam dynamics in injection systems is considered, which at the same time allows the choice of parameters of the accelerating-focusing system. This permits designing the injection system during optimization process, taking into account the required output characteristics of the beam. The given program is based on Win 32 API dialog boxes and is developed in standard C++, using parallel programming tools based on the MPI-1.

TUPPB036	Study of Proton Injector Beam Transverse Phase Space Variations During Accelerating Voltage Pulse	ion, proton, linac, high-voltage	397
	A. Belov, O.T. Frolov, E.S. Nikulin, V.P. Yakushev, V. Zubets RAS/INR, Moscow, Russia
	The proton injector of INR RAS linac provides a pulsed beam with the following parameters: current – up to 100-120 mA; duration – 200 mks; pulse repetition rate – 50 Hz; energy of ions – 400 keV. The results of numerical calculations and experimental study of beam phase space variations during injector high voltage pulse are presented. It is shown that these variations are caused by instabilities of both beam current and accelerating tube intermediate electrode potential. Instability of beam current has been minimized by using of noiseless mode of operation for the pulsed duoplasmatron and by stabilization of ion source discharge current. The high voltage pulse stability is now better than ±0.1%. High frequency oscillations at high voltage pulse plateau have been diminished by both decreasing of high voltage pulse generator artificial line characteristic impedance and filtration of high frequency component of the diode-capacitor stabilizer rack current. The beam transverse normalized emittance for 90% of beam current has been measured to be of 0.08 pi cm*mrad. Variations of the emittance during the high voltage pulse are in limits of ±4% value.

TUPPB037	Second-Order Correction in the Isochronous Mode of the Collector Ring (CR) at FAIR	ion, sextupole, betatron, optics	400
	S.A. Litvinov, C. Dimopoulou, A. Dolinskii, O.E. Gorda, F. Nolden, M. Steck, H. Weick GSI, Darmstadt, Germany
	A challenge for nuclear physics is to measure masses of exotic nuclei up to the limits of nuclear existence which are characterized by low production cross-sections and short half-lives. The large acceptance Collector Ring (CR) at FAIR tuned in the isochronous ion-optical mode offers unique possibilities for such measurements. However, the mass-measurement resolution is inversely proportional to the transverse emittance. In order to reach a resolving power of 10⁵ the transverse beam emittance would have to be limited up to 10 mm mrad in both planes, which drastically reduces the transmission of the exotic nuclei. We demonstrate here that the negative influence of the transverse emittance on the mass resolution can be significantly reduced by a proper second-order correction.

TUPPB059	Low Energy Channel for Modernized LU-20	rfq, ion, solenoid, linac	442
	V. Aleksandrov, A. Govorov, V. Monchinsky, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia
	The modernization of LU-20 accelerator expects change existing electrostatic for-injector on RFQ type pre-accelerator. Low energy channel of transportation of beams is offered from three sources of ions: ESIS, LIS and SPIon - to RFQ. Parameters of channel and results of numerical modeling on fitting beams parameters with acceptance of RFQ are presented.

WEPPD012	Standing Wave RF Deflectors with Reduced Aberrations	impedance, cavity, 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.

WEPPD047	The Optimization of RF Deflector Input Power Coupler	coupling, electron, simulation, diagnostics	650
	A.Yu. Smirnov, O.A. Adonev, N.P. Sobenin MEPhI, Moscow, Russia A.A. Zavadtsev Nano, Moscow, Russia
	This paper concerns the investigation of different types of input power cell for S-band RF electron deflector. This device serving for slice emittance diagnostics is a disc-loaded waveguide which operates with TE11-like wave in traveling wave regime with 120 deg phase shift per cell. Since this deflector meets the restriction on its length and has to provide high enough deflecting potential to a particle during its flight time it is significant to increase the transversal field strength in coupling cell or to shorten it so that the deflecting potential remains constant. The total structure consists of 14 regular cells and two couplers. As it is now all cells have the same length equal to D=33.34 mm and the field in couplers is lower than that of regular cells. In this paper different length are considered and numerically simulated in order to choose the best one.

WEPPD055	Emittance Measurements at the Exit of INR Linac	linac, quadrupole, proton, beam-losses	668
	P.I. Reinhardt-Nickoulin, S. Bragin, A. Feschenko, S.A. Gavrilov, N.F. Lebedeva, A.N. Mirzojan, A.N. Naboka, I.V. Vasilyev, O. Volodkevich RAS/INR, Moscow, Russia
	Emittance measurements at the exit of INR linac are of importance for proper beam matching with the beam line of the downstream experimental facility. Emittance ellipses are reconstructed from beam profile data obtained with three wire scanners and one ionization beam cross section monitor (BCSM). A possibility of quadrupole gradients adjustment not only increases the reconstruction accuracy but also enables to find emittances with BCSM data only. The latter provides completely transparent measurements and due to large BCSM range can be done within a wide range of beam currents. The results of measurements done with wire scanners and BCSM are presented and compared, the reconstruction procedure features are discussed.

WEPPD057	Commissioning of New Diagnostic Devices at PITZ	electron, booster, cavity, 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.

WEPPD059	AIRIX Measurement Chain Optimization For Electron Beam Dynamic and Dimensional Characteristics Analysis	electron, target, beam-transport, extraction	677
	F. Poulet, V. Bernigaud, H. Dzitko, J.K. Kranzmann, C. Noël, O. Pierret CEA, Pontfaverger-Moronvilliers, France C. Chollet CEA/DAM/DIF, Arpajon, France
	AIRIX is a linear accelerator dedicated to X-ray flash radiography at CEA's hydrotest facility. It has been designed to generate an intense X-ray pulse using a 2 kA, 19 MeV and 60 ns electron beam. The electron beam transport in the accelerator is insured by the knowledge of the dynamic and dimensional characteristics of the beam created downstream the injector. These characteristics are assessed from a measurement chain, established by adapted optics and an intensified camera, aiming at observing the Cerenkov radiation produced during the interaction of electrons with a mylar target placed in the beam. This paper deals with the characterization, and comparison with the previous model, of a new intensified camera which was experimentally tested on AIRIX during an injector characterization campaign. This allowed defining profile and emittance beam characteristics. The obtained results are promising and revealed very interesting properties in particular in term of dynamic, temporal resolution, linearity and signal-to-noise ratio.

Paper

Title

Other Keywords

Page

Design and Simulation of Practical Alternating-Phase-Focused (APF) Linacs – Synthesis and Extension in Tribute to Pioneering Russian APF Research

linac, focusing, acceleration, ion

12

R.A. Jameson
IAP, Frankfurt am Main, Germany

Conventional magnetic transverse focusing in conventional linacs represents a high fraction of their cost and complexity. Both transverse and longitudinal focusing can be obtained from the rf field by using the strong-focusing effect of alternating patterns (sequences) of gap phases and amplitudes – known as Alternating-Phase-Focusing (APF). Although studied for decades, the difficulty of designing suitable sequences has inhibited APF adoption, although short sequence APFs are now used in a number of practical applications. Synthesis of reported details and new physics and technique result in a new, general and efficient method for designing APF linacs. Very long sequences with high energy gain factors are demonstrated, e.g. for acceleration of very cold muons from ~0.340-200MeV (factor 600).

Slides MOACH02 [0.616 MB]

MOBCH01

Storage, Acceleration and Short Bunched Beam Formation of 197Au+79 Ions in the NICA Collider

ion, acceleration, collider, accumulation

30

A.V. Eliseev, A.V. Smirnov
JINR, Dubna, Moscow Region, Russia
T. Katayama
GSI, Darmstadt, Germany
E. Kenzhbulatov, G.Y. Kurkin, V.M. Petrov, V. Volkov
BINP SB RAS, Novosibirsk, Russia
O.S. Kozlov, A.O. Sidorin, G.V. Trubnikov
JINR/VBLHEP, Dubna, Moscow region, Russia
I.N. Meshkov
JINR/DLNP, Dubna, Moscow region, Russia

The regimes of high intensity beam of 197Au⁷⁹⁺ ions in NICA Collider is considered. The first stage – ion storage is proposed to be performed with Barrier Bucket technique at ion energy of 1–3 GeV/u. Experiments in collider mode in this energy range can be performed at injection energy. For experiments at higher, up to 4.5 GeV/u, energy ions are accelerated with the same BB method. Formation of bunched beam is fulfilled in two steps – first, at 24th harmonics and then, final formation, at 72th harmonics of RF system. The possibility of achievement of designed bunch parameters is shown.

Slides MOBCH01 [0.807 MB]

TUCCH02

Beam Dynamics Investigations for 433 MHz RFQ Accelerator

rfq, focusing, ion, injection

82

Y.A. Svistunov
NIIEFA, St. Petersburg, Russia
A.P. Durkin
MRTI RAS, Moscow, Russia
A.D. Ovsyannikov
St. Petersburg State University, St. Petersburg, Russia

Modeling results for deuteron dynamics in RFQ structure with operational frequency 433 MHz and 1 MeV output energy are presented. The results are compared with experimental data. The purpose of investigation is to find optimal input RFQ emittance parameters for off-nominal values of input current and vane voltage.

Slides TUCCH02 [0.642 MB]

MOPPA005

Laser-Wakefield Acceleration with External Bunch Injection at REGAE

plasma, laser, electron, injection

254

J. Grebenyuk, K. Flöttmann
DESY, Hamburg, Germany
T. Mehrling, J. Osterhoff
Uni HH, Hamburg, Germany

Funding: Helmholtz Alliance
Short and highly intense laser pulses focused into a gas target, ionise the gas and may excite large amplitude plasma waves that support extreme electric fields (>10 GV/m) for acceleration of charged particles. The REGAE facility at DESY, which provides 2-5 MeV of ~10 fs bunches, offers the unique possibility to study the external injection of pre-accelerated electron bunches from a conventional accelerator, and their subsequent acceleration in plasma wakefields. Simulations were performed with the particle-in-cell code OSIRIS, showing a wide variety of effects which can be explored in the future at REGAE. External controlled injection allows to study effects which require precise information about the beam quality, position and momentum at the initial point of injection. Topics of a particular interest are: bunch emittance growth suppression, controlled betatron motion, and longitudinal bunch compression.

TUPPB007

Transfer Channel from Booster to Nuclotron at the NICA Facility

ion, booster, quadrupole, simulation

322

G.A. Filatov, I.N. Meshkov, V.A. Mikhaylov, A.O. Sidorin, N.D. Topilin, G.V. Trubnikov, A. Tuzikov
JINR, Dubna, Moscow Region, Russia

In the last years the Nuclotron-based Ion Collider fAcility (NICA) project is developed at Joint Institute for Nuclear Research (JINR), Dubna, Russia. Important elements of the NICA are two synchrotrons: Booster and Nuclotron. Connection between these synchrotrons is provided with the transfer channel for heavy ions at energy of 600 MeV/u. The transfer channel includes a stripping station and charge separation system. General goal of the optic design is to minimize emittance at the exit of the channel. Magnetic system of the channel will be constructed using magnets of the Nuclotron type.

TUPPB011

Analytical Approach for Beam Matching

linac, ion, simulation, controls

334

V.S. Dyubkov, S.M. Polozov
MEPhI, Moscow, Russia

Charge particle beams transportation with small cross-sections and low energies is an actual problem for a gantry. That beams are used actively for isotope therapy. Beam emittance is its quality factor, and it should be matched with a facility channel acceptance. The method for beam dynamics analysis in lattice is developed in terms of non-coherent particle oscillation study. Nonlinear beam dynamics is investigated by using this method. It is shown that this technique allows one to realize effective beam emittance control. Analytical results obtained are verified by means of numerical simulation.

TUPPB022

Mathematical Model of Beam Dynamic Optimization

focusing, DTL, controls, linac

361

V.V. Altsybeyev
St. Petersburg State University, St. Petersburg, Russia

We treat here the process of simulation of charged particle dynamics using so called hybrid system. Hybrid system is a system with continuous and discrete parts, described by differential and difference equations, respectively. In this case new mathematical model of beam dynamics optimization is suggested. The main parameters of optimization are: coefficient of particle capture in the acceleration mode, phase and energy spectra of particles at the exit of the accelerator, the transverse beam characteristics, etc. Optimization was carried out for the drift tubes accelerator.

TUPPB024

Development of the Object-oriented Program in C ++ for Simulation of Beam Dynamics in Accelerator Injection Systems

injection, simulation, controls, focusing

364

S.A. Kozynchenko
St. Petersburg State University, St. Petersburg, Russia

At present, more and more attention is paid to the design and creation of accelerator systems for precision beams. Their injection systems in many aspects determine the output characteristics of the beam, so the questions of the design of such systems are of great importance. In such cases both simulation and optimization of beam dynamics in electromagnetic fields close to real may be necessary. In this paper the program for simulation and optimization of beam dynamics in injection systems is considered, which at the same time allows the choice of parameters of the accelerating-focusing system. This permits designing the injection system during optimization process, taking into account the required output characteristics of the beam. The given program is based on Win 32 API dialog boxes and is developed in standard C++, using parallel programming tools based on the MPI-1.

TUPPB036

Study of Proton Injector Beam Transverse Phase Space Variations During Accelerating Voltage Pulse

ion, proton, linac, high-voltage

397

A. Belov, O.T. Frolov, E.S. Nikulin, V.P. Yakushev, V. Zubets
RAS/INR, Moscow, Russia

The proton injector of INR RAS linac provides a pulsed beam with the following parameters: current – up to 100-120 mA; duration – 200 mks; pulse repetition rate – 50 Hz; energy of ions – 400 keV. The results of numerical calculations and experimental study of beam phase space variations during injector high voltage pulse are presented. It is shown that these variations are caused by instabilities of both beam current and accelerating tube intermediate electrode potential. Instability of beam current has been minimized by using of noiseless mode of operation for the pulsed duoplasmatron and by stabilization of ion source discharge current. The high voltage pulse stability is now better than ±0.1%. High frequency oscillations at high voltage pulse plateau have been diminished by both decreasing of high voltage pulse generator artificial line characteristic impedance and filtration of high frequency component of the diode-capacitor stabilizer rack current. The beam transverse normalized emittance for 90% of beam current has been measured to be of 0.08 pi cm*mrad. Variations of the emittance during the high voltage pulse are in limits of ±4% value.

TUPPB037

Second-Order Correction in the Isochronous Mode of the Collector Ring (CR) at FAIR

ion, sextupole, betatron, optics

400

S.A. Litvinov, C. Dimopoulou, A. Dolinskii, O.E. Gorda, F. Nolden, M. Steck, H. Weick
GSI, Darmstadt, Germany

A challenge for nuclear physics is to measure masses of exotic nuclei up to the limits of nuclear existence which are characterized by low production cross-sections and short half-lives. The large acceptance Collector Ring (CR) at FAIR tuned in the isochronous ion-optical mode offers unique possibilities for such measurements. However, the mass-measurement resolution is inversely proportional to the transverse emittance. In order to reach a resolving power of 10⁵ the transverse beam emittance would have to be limited up to 10 mm mrad in both planes, which drastically reduces the transmission of the exotic nuclei. We demonstrate here that the negative influence of the transverse emittance on the mass resolution can be significantly reduced by a proper second-order correction.

TUPPB059

Low Energy Channel for Modernized LU-20

rfq, ion, solenoid, linac

442

V. Aleksandrov, A. Govorov, V. Monchinsky, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia

The modernization of LU-20 accelerator expects change existing electrostatic for-injector on RFQ type pre-accelerator. Low energy channel of transportation of beams is offered from three sources of ions: ESIS, LIS and SPIon - to RFQ. Parameters of channel and results of numerical modeling on fitting beams parameters with acceptance of RFQ are presented.

WEPPD012

Standing Wave RF Deflectors with Reduced Aberrations

impedance, cavity, 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.

WEPPD047

The Optimization of RF Deflector Input Power Coupler

coupling, electron, simulation, diagnostics

650

A.Yu. Smirnov, O.A. Adonev, N.P. Sobenin
MEPhI, Moscow, Russia
A.A. Zavadtsev
Nano, Moscow, Russia

This paper concerns the investigation of different types of input power cell for S-band RF electron deflector. This device serving for slice emittance diagnostics is a disc-loaded waveguide which operates with TE11-like wave in traveling wave regime with 120 deg phase shift per cell. Since this deflector meets the restriction on its length and has to provide high enough deflecting potential to a particle during its flight time it is significant to increase the transversal field strength in coupling cell or to shorten it so that the deflecting potential remains constant. The total structure consists of 14 regular cells and two couplers. As it is now all cells have the same length equal to D=33.34 mm and the field in couplers is lower than that of regular cells. In this paper different length are considered and numerically simulated in order to choose the best one.

WEPPD055

Emittance Measurements at the Exit of INR Linac

linac, quadrupole, proton, beam-losses

668

P.I. Reinhardt-Nickoulin, S. Bragin, A. Feschenko, S.A. Gavrilov, N.F. Lebedeva, A.N. Mirzojan, A.N. Naboka, I.V. Vasilyev, O. Volodkevich
RAS/INR, Moscow, Russia

Emittance measurements at the exit of INR linac are of importance for proper beam matching with the beam line of the downstream experimental facility. Emittance ellipses are reconstructed from beam profile data obtained with three wire scanners and one ionization beam cross section monitor (BCSM). A possibility of quadrupole gradients adjustment not only increases the reconstruction accuracy but also enables to find emittances with BCSM data only. The latter provides completely transparent measurements and due to large BCSM range can be done within a wide range of beam currents. The results of measurements done with wire scanners and BCSM are presented and compared, the reconstruction procedure features are discussed.

WEPPD057

Commissioning of New Diagnostic Devices at PITZ

electron, booster, cavity, 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.

WEPPD059

AIRIX Measurement Chain Optimization For Electron Beam Dynamic and Dimensional Characteristics Analysis

electron, target, beam-transport, extraction

677

F. Poulet, V. Bernigaud, H. Dzitko, J.K. Kranzmann, C. Noël, O. Pierret
CEA, Pontfaverger-Moronvilliers, France
C. Chollet
CEA/DAM/DIF, Arpajon, France

AIRIX is a linear accelerator dedicated to X-ray flash radiography at CEA's hydrotest facility. It has been designed to generate an intense X-ray pulse using a 2 kA, 19 MeV and 60 ns electron beam. The electron beam transport in the accelerator is insured by the knowledge of the dynamic and dimensional characteristics of the beam created downstream the injector. These characteristics are assessed from a measurement chain, established by adapted optics and an intensified camera, aiming at observing the Cerenkov radiation produced during the interaction of electrons with a mylar target placed in the beam. This paper deals with the characterization, and comparison with the previous model, of a new intensified camera which was experimentally tested on AIRIX during an injector characterization campaign. This allowed defining profile and emittance beam characteristics. The obtained results are promising and revealed very interesting properties in particular in term of dynamic, temporal resolution, linearity and signal-to-noise ratio.