RUPAC2012 - List of Authors (Feschenko, A.)

Paper

Title

Page

Multipurpose Research Complex Based on the INR High Intensity Proton Linac

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]

FRXOR01

Technique and Instrumentation For Bunch Shape Measurements

181

A. Feschenko
RAS/INR, Moscow, Russia

Bunch shape is one of the most important, interesting but difficult to observe characteristics of a beam in ion linear accelerators. Different possibilities of bunch shape measurements are considered but the emphasis is put on the Bunch Shape Monitors (BSM) developed in INR RAS. The operation of BSM is based on a coherent transformation of a longitudinal structure of a beam under study into a spatial distribution of a secondary electron beam through rf scanning. BSM characteristics found both by simulations and experimentally are presented; the ultimate parameters and the limitations are discussed. Modifications of BSM are described. Some experimental results of bunch observations are demonstrated.

Slides FRXOR01 [6.339 MB]

MOPPA022

Status of INR DTL RF System

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

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.

WEPPC003

Beam Pulse Separation System of INR Linac

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.

WEPPC034

Power Supply System of the Pulse Bending Magnet for the Linear Accelerator Operated at the Moscow Meson Factory

515

B.O. Bolshakov, A.A. Budtov, A.V. Popov, A.V. Pozhensky
NIIEFA, St. Petersburg, Russia
A. Feschenko, O.V. Grekhov, V.N. Mikhailov, V.L. Serov
RAS/INR, Moscow, Russia

A bending magnet with a power supply system has been designed and manufactured in the NIIEFA for the Institute for Nuclear Research RAS to ensure simultaneous operation of the linear accelerator in the experimental and isotopic systems. The arrangement has been installed and adjusted in the INR RAS. In the paper are described a schematic and principle of operation of the arrangement ensuring the bending of a part of the beam macroimpulses to the isotopic system with a frequency of up to 50 Hz. The adjustment results are presented.

WEPPD055

Emittance Measurements at the Exit of INR Linac

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.

Paper	Title	Page
WEYCH02	Multipurpose Research Complex Based on the INR High Intensity Proton Linac	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]

FRXOR01	Technique and Instrumentation For Bunch Shape Measurements	181
	A. Feschenko RAS/INR, Moscow, Russia
	Bunch shape is one of the most important, interesting but difficult to observe characteristics of a beam in ion linear accelerators. Different possibilities of bunch shape measurements are considered but the emphasis is put on the Bunch Shape Monitors (BSM) developed in INR RAS. The operation of BSM is based on a coherent transformation of a longitudinal structure of a beam under study into a spatial distribution of a secondary electron beam through rf scanning. BSM characteristics found both by simulations and experimentally are presented; the ultimate parameters and the limitations are discussed. Modifications of BSM are described. Some experimental results of bunch observations are demonstrated.
	Slides FRXOR01 [6.339 MB]

MOPPA022	Status of INR DTL RF System	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	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.

WEPPC003	Beam Pulse Separation System of INR Linac	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.

WEPPC034	Power Supply System of the Pulse Bending Magnet for the Linear Accelerator Operated at the Moscow Meson Factory	515
	B.O. Bolshakov, A.A. Budtov, A.V. Popov, A.V. Pozhensky NIIEFA, St. Petersburg, Russia A. Feschenko, O.V. Grekhov, V.N. Mikhailov, V.L. Serov RAS/INR, Moscow, Russia
	A bending magnet with a power supply system has been designed and manufactured in the NIIEFA for the Institute for Nuclear Research RAS to ensure simultaneous operation of the linear accelerator in the experimental and isotopic systems. The arrangement has been installed and adjusted in the INR RAS. In the paper are described a schematic and principle of operation of the arrangement ensuring the bending of a part of the beam macroimpulses to the isotopic system with a frequency of up to 50 Hz. The adjustment results are presented.

WEPPD055	Emittance Measurements at the Exit of INR Linac	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.