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TUPLS — Poster Session 27-Jun-06 16:00 - 18:00 Extraction System Design for the BSNS/RCS The BSNS extraction system takes one of the four dispersion-free straight sections. Five vertical kickers and one Lambertson septum magnet are used for the one-turn extraction. J. Tang, Y.L. Chi, Y.L. Jiang, W. Kang, J.B. Pang, Q. Qin, S. Wang, W. Wang (IHEP Beijing) J. Wei (BNL) The rise time of less than 250 ns and the total kicking angle of 20 mrad are required for the kickers that are grouped into two tanks. The design for the kicker magnets and the PFN is also given. To reduce the low beam loss in the extraction channels due to the large halo emittance, large apertures are used for both the kickers and septum. Stray magnetic field inside and at the two ends of the circulating path of the Lambertson magnet and its effect on the beam have been studied. Beam Transport Lines for the BSNS This paper presents the design of two beam transport lines at the BSNS: one is the injec- J. Tang, G.H. Wei (IHEP Beijing) tion line from the Linac to the RCS and the other is the target line from the RCS to the target station. In the injection line, transverse halo collimation, momentum tail collimation and debunching are the main concerned topics. Triplet cells and stripping foils are used to collimate transverse halo. Long straight section is reserved for future upgrading of the Linac and debuncher. In the target line, large halo emittance, beam stability at the target due to kicker failures and beam jitters, shielding of back-scattering neutrons from the target are the main topics. Injection System Design for the BSNS/RCS The BSNS injection system is designed to take one uninterrupted long drift in one of the four dispersion-free straight sections to host all the injection devices. Painting bumper J. Tang, Y.L. Jiang, W. Kang, J.B. Pang, Q. Qin, J. Qiu, L. Shen, S. Wang (IHEP Beijing) J. Wei (BNL) magnets are used for both horizontal and vertical phase space painting. Closed-orbit bumper magnets are used for facilitating the installation of the injection septa and decreasing proton traversal in the stripping foil. Even large beam emittance of about 300 pmm.mrad is used, BSNS/RCS still approaches the space charge limit during the injection/ trapping phase for the accumulated particles of 1.9*10 13 and low injection energy of 80 MeV. Good painting scheme is also required to obtain uniform beam distribution to decrease the tune shift/spread. ORBIT code is used for the 3D simulations. Design Study of the Axial Injection System of C400 Cyclotron Computer modeling results on the axial injection system design are given. Results of simulations of the Carbon, Hydrogen and Helium ion beam injection are presented. V. Shevtsov, V. Aleksandrov, Yu. Kazarinov (JINR) Y. Jongen, D. Vandeplassche (IBA) 255 TUPLS116 TUPLS117 TUPLS118 TUPLS119
TUPLS120 TUPLS121 TUPLS122 27-Jun-06 16:00 - 18:00 TUPLS — Poster Session Laser Technology for Filling ITEP-TWAC Synchrotron Rings One of the key systems of the ITEP-TWAC ac- B.Y. Sharkov, A. Balabaev, A.M. Kozodaev, A. Shumshurov (ITEP) celerator/accumulator facility of Moscow’s Institute for Theoretical and Experimental Physics (ITEP) is the laser ion source (LIS). Its implementation in accelerator scheme gives possibility to employ the Non-Liouvillian stripping injection process from the booster ring into the accumulator ring. The ion source, based on 5J/0.5 Hz TEA CO2-laser is being in operation provides 20 mA/10 µs carbon ion beam to the 2 MV/2.5 MHz preinjector. As a result the ITEP-TWAC facility delivers the ion beams in two operation modes : - in ion acceleration mode supplying and up to 109 4.3 GeV/u carbon C 6+ ions per second; - in ion accumulation mode ∼2 1010 300MeV/ u carbon C 6+ ions per 170 ns pulse; The development of intermediate version of the LIS based on 10J/0.5 Hz CO2laser opens opportunity for generation of intense bunches of heavy ions with atomic mass up to A ∼ 40 by the end of 2006. Assembling of the powerful CO2-laser with 100 J/20 ns output at 1 Hz is in progress to be set in operation by the end of 2007. A Comparison of Simulated and Measured Emittance of Ion Beams Extracted from 2.45 GHz Permanent Magnet ECR Ion Source The emittance studies of the 2.45 GHz per- A. Zelenak (Biont, a.s.) S.L. Bogomolov (JINR) manent magnet ECR ion source were done at the FLNR, JINR, Dubna*. It was found strong emittance dependence on the operating mode of the ECR ion source, on the different configuration of the extraction system and on the shape of plasma electrode. The new additional emittance studies have been done for 2.45 GHz permanent magnet ECR ion source and they are presented in this article. The comparisons of additional emittance simulations with the emittance measurements for the ECR ion source are presented. There were found the optimal input parameters for the program IGUN. A discussion about a computer simulation and emittance measurements is included. *A. Zelenak et al. Emittance studies of the 2.45 GHz permanent magnet ECR ion source, Rev. Sci. Instrum., Vol. 75, No. 5, May 2004. Implementation of the Proposed Multiturn Extraction at the CERN Proton Synchrotron Following the positive results of the three- M. Giovannozzi (CERN) year measurement campaign at the CERN Proton Synchrotron concerning beam splitting with stable islands in the transverse phase space, the study of a possible implementation of the proposed multiturn extraction was undertaken. The novel approach would allow a substantial reduction of beam losses, with respect to the present scheme, when delivering the high-intensity proton beams required for the planned CERN Neutrino to Gran Sasso Project. Major modifications to the ring layout are foreseen, such as a new design of the extraction bumps including also the installation of three additional kickers to create a closed-bump over the five turns used to extract the split beam. The ring aperture was reviewed and improvements are proposed to reduce possible beam losses between beam splitting and extraction. The goal consists of implementing the proposed changes by the end of the 2007/2008 PS shutdown and to commission the novel extraction during the 2008 physics run. 256
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Amro, A. THPLS043 An, D.H. TUPCH070
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