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MOP114 Confirmation of Leak Tightness of the Mo Sealing in Superfluid Helium cavity, vacuum, SRF, impedance 331
 
  • K. Saito, F. Furuta
    KEK, Ibaraki
  • T. Konomi
    Nagoya University, Nagoya
 
 

MO sealing developed by Prof. H. Matsumoto in KEK and his collaborator M. Ohotsuka has been successfully applied to SRF cavities. Its leak ratio is smaller than 3·10-8 Pam3/s or much better in the superfluid Helium, which is the allowed level to successfully measure the cavity performance for more than 3 hours at 2K. Tightening torque is 15Nm and the bolt material is SUS304 (JIS). Titanium is usable as cavity flange material. Copper looks better than pure Aluminium as the gasket material. We have observed an additional residual surface resistance about 5nΩ Zero impedance characteristics of the MO sealing is a remained issue. In this paper we report the results in detail.

 
TUP005 Status of Development of the cERL Superconducting Injector Linac HOM, cavity, linac, target 401
 
  • K. Watanabe, E. Kako, S. Noguchi, M. Satoh, T. Shishido, Y. Yamamoto
    KEK, Ibaraki
 
 

Development of the superconducting injector Linac for compact ERL has been continuing at KEK. The cryomodule including three two-cell SC cavities was designed. Two prot-type two-cell cavities were fabricated, and the vertival test were carried out after the standard surface preparation at STF. The high power tests of the input couplers were also carried out at the test stand with 300 kW cw klystron. The status of the cERL injector cryomodue will be reported.

 
TUP092 The ISAC II Current Monitor System ISAC, controls, rfq, linac 623
 
  • M. Marchetto, J. Aoki, K. Langton, R.E. Laxdal, W.R. Rawnsley, J.E. Richards
    TRIUMF, Vancouver
 
 

The post acceleration section of the ISAC radioactive ion beam (RIB) facility is composed of a radio frequency quadrupole (RFQ) followed by a drift tube linac (DTL), both room temperature machines, that serve a medium energy experimental area up to 1.8 MeV/u, and a superconducting linac (SCLINAC) that serves a high energy experimental area. This SCLINAC, composed of forty quarter wave resonators housed in eight cryomodules, is capable of a total accelerating voltage of circa 40 MV. Since each cavity is phased independently at the maximum operational voltage, the final energy depends on the mass to charge ratio of the accelerated species. In order to deliver energies higher than 5 MeV/u we need to monitor the beam current as mandated by our operating license. The current monitor system (CMS) is composed of two non intercepting and one partially intercepting monitor. The signals from these three monitors are processed in a single control system that provides a go signal to the Safety system enabling beam delivery. The CMS system allows to exploit the SCLINAC to its full potential. In this paper we will present both hardware configuration and software control of the CMS.

 
TUP100 Measuring the Longitudinal Bunch Profile at CTF3 single-bunch, monitoring, controls, linac 647
 
  • A.E. Dabrowski, E. Adli, S. Bettoni, R. Corsini, S. Döbert, D. Egger, T. Lefèvre, A. Rabiller, P.K. Skowronski, L. Søby, F. Tecker
    CERN, Geneva
  • H.-H. Braun
    PSI, Villigen
  • H. Shaker
    IPM, Tehran
  • M. Velasco
    NU, Evanston
 
 

The CLIC Test Facility 3 (CTF3) is being built and commissioned by an international collaboration in order to test the feasibility of the proposed Compact Linear Collider (CLIC) two-beam acceleration scheme. The monitoring and control of the bunch length throughout the CTF3 complex is important since this affects the efficiency and the stability of the RF power production process. Bunch length diagnostics therefore form an essential component of the beam instrumentation at CTF3. This paper presents and compares longitudinal profile measurements based on transverse RF deflectors, Streak camera and non-destructive microwave spectrometry techniques.