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monitoring

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TUP011 Upgrade of Beam Diagnostics in LEBT and MEBT of J-PARC LINAC linac, diagnostics, vacuum, rfq 268
 
  • S. Sato, T. Tomisawa, A. Ueno
    JAEA/LINAC, Ibaraki-ken
  • H. Akikawa, Z. Igarashi, M. Ikegami, C. Kubota, S. Lee
    KEK, Ibaraki
  • Y. Kondo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  After tests in Tsukuba-site, Front end part (from an ion source upto the first drift tube linac) of J-PARC LINAC was transported to Tokai-site. From the coming December, testing with H- beam is planned. After the tests in Tsukuba, a few beam current monitors are added in the low and the medium energy transport line, and those monitors are used for the machine- and the person-protection system. In this paper, design and roles of each monitor are described.  
 
TUP013 Using Higher Order Modes in Superconducting Accelerating Cavities for Beam Monitoring controls, dipole, single-bunch, electron 271
 
  • N. Baboi, O. Hensler
    DESY, Hamburg
  • N. E. Eddy, S. Nagaitsev
    Fermilab, Batavia, Illinois
  • J. C. Frisch, S. Molloy, M. C. Ross
    SLAC, Menlo Park, California
  • O. Napoly, R. Paparella
    CEA, Gif-sur-Yvette
  Dipole modes have been shown to be successful diagnostics for the beam position in superconducting accelerating cavities at the VUV Free Electron Laser (FEL) facility at DESY. By help of downmixing electronics the signals from the two higher order mode couplers mounted on each cavity are monitored. Due to the non-symmetric placement of the couplers and the overlapping of the two polarizations of the modes, the calibration is somewhat more complicated than in standard position monitors. A method based on the model independent analysis has been developed. The calibration measurements made at the VUV FEL will be presented.  
 
TUP018 Low-Intensity Electron Beam Monitoring and Beam Applications at OPU Linac electron, linac, radiation, gun 286
 
  • S. Okuda, T. Kojima, Y. Tanaka, R. Taniguchi
    Osaka Prefecture University, Sakai
  Low intensity beams are generated with a 18 MeV S-band electron linac at Osaka Prefecture University (OPU). The minimum charge of electrons in a pulsed beam has been estimated to be about several attocoulomb. In order to measure the intensity and the profile of the beams with thermoluminescence dosimeters and two-dimensional radiation dosimeters, the characteristics of the dosimeters have been investigated by using the electron beams. For the charge of the beam above one picocoulomb, charge-sensitive type beam monitors have been used. The linear relation between the output signal of the dosimeter and the irradiation dose of the beam has been obtained. From the results it has been found that these dosimeters can be applied to monitoring the low intensity electron beam. The beam applications under preparation are presented.  
 
TUP023 Beam-Size Measurements in the IPNS 50-MeV Transport Line Using Stripline BPMs linac, quadrupole, diagnostics, controls 296
 
  • J. C. Dooling, F. R. Brumwell, L. Donley, G. E. McMichael, V. F. Stipp
    ANL, Argonne, Illinois
  Continuing with the work started two years ago, the technique of using a two-beamlet model to measure beam size is presented. Beam signals are detected on terminated 50-ohm, stripline BPMs located in the transport line between the 50 MeV linac and rapid cycling synchrotron. Each BPM is constructed with four striplines: top, bottom, left and right. Using a fast-sampling oscilloscope to compare the signals from opposite strip lines allows one to determine beam size assuming a two beamlet model. Measurements made with the two-beamlet approach are compared with other standard profile diagnostics such as wire-scanners, segmented Faraday cups, and scintillators. Advantages of the two-beamlet method are that it is non intrusive and does not require the presence of a background gas necessary for an IPM. Disadvantages of the technique are that it does not provide a detailed profile and the longitudinal beam pulse length must be short relative to the stripline length.  
 
TUP067 Tune-up Scenario for Debuncher System in J-PARC L3BT injection, simulation, linac, target 406
 
  • M. Ikegami, H. Akikawa, Z. Igarashi, S. Lee
    KEK, Ibaraki
  • Y. Kondo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • T. Morishita, S. Sato, T. Tomisawa, A. Ueno
    JAEA/LINAC, Ibaraki-ken
  • T. Ohkawa
    JAEA, Ibaraki-ken
  We plan to start beam commissioning of J-PARC linac and the succeeding beam transport line in December 2006. The beam transport line, to which we refer as L3BT, has two key functionalities to satisfy the requirements for the succeeding ring injection. One is to reduce the momentum jitter and momentum spread, and the other is to scrape off the transverse tail. To realize the former functionality, a debuncher system is installed in L3BT which enables longitudinal gymnastics of the beam to reduce the momentum spread at the ring injection. In this presentation, the tune-up scenario for the debuncher system is presented together with simulation results on the effects of debuncher system.  
 
TUP068 Tuning Strategy for Transverse Collimator in J-PARC L3BT collimation, beam-losses, linac, injection 409
 
  • M. Ikegami, H. Akikawa, S. Lee
    KEK, Ibaraki
  • H. Ao, T. Morishita, S. Sato, A. Ueno
    JAEA/LINAC, Ibaraki-ken
  • Y. Kondo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • T. Ohkawa
    JAEA, Ibaraki-ken
  We plan to start beam commissioning of J-PARC linac and the succeeding beam transport line in December 2006. The beam transport line, to which we refer as L3BT, has two key functionalities to satisfy the requirements for the succeeding ring injection. One is to reduce the momentum jitter and momentum spread, and the other is to scrape off the transverse tail. To realize the latter functionality, a transverse collimator system is installed in L3BT which consists of four horizontal and four vertical collimators. In this presentation, the tuning strategy for the transverse collimator system is presented together with the main features of the collimator system.  
 
THP037 Wide-Range Frequency Compensation by Coaxial Ball-Screw Tuner resonance, acceleration, linear-collider, booster 658
 
  • T. Higo, Y. Higashi, Y. Morozumi, K. Saito, K. Ueno, H. Yamaoka
    KEK, Ibaraki
  Low-loss 9-cell 1.3GHz cavities are studied at KEK aiming at a high-gradient operation for the International Linear Collider. One of the most important issues to realize such a high gradient in a pulsed operation of super-conducting cavities is the issue of how to compensate the Lorentz detuning. The Lorentz detuning of the cavity amounts to 3kHz at 45MV/m acceleration field. None of the tuners to date have achieved this range. A coaxial ball-screw tuner was designed and proved to reach this level in the room temperature operation. The performance at liquid Nitrogen temperature is also studied. From these results, we try to evaluate the feasibility of the operation at 2K.  
 
THP082 Industrialization of TESLA-Type SRF Technology at ACCEL vacuum, cryogenics, controls, electron 773
 
  • M. Pekeler, S. Bauer, H. Vogel, P. vom Stein
    ACCEL, Bergisch Gladbach
  In the last 15 years the worldwide TESLA collaboration under the leadership of DESY performed successful developements of SRF technology for possible use in a future international linear collider (ILC). Today this technology is also the baseline for other demanding projects like the European X-FEL at DESY site, 4GLS at Daresbury, BESSY FEL, Cornell-ERL, FEL at Peking University and others. Through all these years ACCEL has followed and supported this tremendous developement by producing and processing SRF cavities, couplers and complete accelerator modules. The current ability and future prospects of ACCEL for manufacturing and processing such key components as well as turnkey SRF modules with guaranteed performance for such projects are described.