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Khabiboulline, T. N.

Paper Title Page
WEPMN096 Status of the 3.9-GHz Superconducting RF Cavity Technology at Fermilab 2254
  • E. R. Harms, T. T. Arkan, L. Bellantoni, H. Carter, H. Edwards, M. Foley, T. N. Khabiboulline, D. V. Mitchell, D. R. Olis, A. M. Rowe, N. Solyak
    Fermilab, Batavia, Illinois
  Funding: This work supported by Universities Research Association Inc. under contract DE-AC02-76CH00300 with the U. S. DOE.

Fermilab is involved in an effort to assemble 3.9 GHz superconducting RF cavities into a four cavity cryomodule for use at the DESY TTF/FLASH facility as a third harmonic structure. The design gradient of these cavities is 14 MV/m limited by thermal heat transfer. This effort involves design, fabrication, intermediate testing, assembly, and eventual delivery of the cryomodule. We report on all facets of this enterprise from design through future plans. Included will be test results of single 9-cell cavities, lessons learned, and current status.

WEPMN098 New HOM Coupler Design for 3.9 GHz Superconducting Cavities at FNAL 2259
  • T. N. Khabiboulline, I. G. Gonin, N. Solyak
    Fermilab, Batavia, Illinois
  Last few years Fermilab is developing the superconducting third harmonic section for the FLASH (TTF/DESY) upgrade. The results of vertical tests of 9-cell Nb cavities didn't reached the designed accelerating gradient. The main gradient limitation is multipacting in HOM coupler. In this paper we present the results of vertical tests accompanied with 3D Analyst simulations of multipacting. Also we discuss the RF design of a new HOM couplers. The goal of a new design is to eliminate multipacting and to increase the frequency of second resonance of the HOM. Increasing the frequency will decrease the electric and magnetic fields having the goal to decrease the thermal load on antenna.  
WEPMN099 Production of 325 MHz Single Spoke Resonators at FNAL 2262
  • G. Lanfranco, G. Apollinari, I. G. Gonin, T. N. Khabiboulline, G. Romanov, R. L. Wagner
    Fermilab, Batavia, Illinois
  • A. Bosotti
    INFN/LASA, Segrate (MI)
  Funding: US Department of Energy

The High Intensity Neutrino Source (HINS) project represents the current effort at Fermi National Accelerator Laboratory to produce an 8-GeV proton linac based on about 400 independently phased superconducting resonators. Eighteen β=0.21 single spoke resonators, operating at 325 MHz, comprise the first stage of the linac cold section. We are presenting the production status of the first two of these resonators and the performance of the tuning mechanism prototype. In particular, we will report on the construction phases, the pre-weld tuning process and the comparison of low power RF measurements with calculations made using Microwave Studio*.

* CST MICROWAVE STUDIO (CST MWS), http://www.cst.com/

WEPMN105 Fast Thermometry for Superconducting RF Cavity Testing 2280
  • D. F. Orris, L. Bellantoni, R. H. Carcagno, H. Edwards, E. R. Harms, T. N. Khabiboulline, S. Kotelnikov, A. Makulski, R. Nehring, Y. M. Pischalnikov
    Fermilab, Batavia, Illinois
  Funding: Work supported by Universities Research Association Inc. under Contract No. DE-AC02-76CH03000 with the United States Department of Energy.

Fast readout of strategically placed low heat capacity thermometry can provide valuable information of Superconducting RF (SRF) cavity performance. Such a system has proven very effective for the development and testing of new cavity designs. Recently, several RTDs were installed in key regions of interest on a new 9 cell 3.9 GHz SRF cavity with integrated HOM design at FNAL. A data acquisition system was developed to read out these sensors with enough time and temperature resolution to measure temperature changes on the cavity due to heat generated from multipacting or quenching within power pulses. The design and performance of this fast thermometry system will be discussed along with results from tests of the 9 cell 3.9GHz SRF cavity.

WEPMN110 Fabrication and Test of the First Normal-Conducting Crossbar H-type Accelerating Cavity at Fermilab for HINS 2292
  • L. Ristori, G. Apollinari, I. G. Gonin, T. N. Khabiboulline, G. Romanov
    Fermilab, Batavia, Illinois
  Funding: This work was supported by the U. S. Department of Energy under contract number DE-AC02-76CH03000

The proposed High Intensity Neutrino Source at Fermilab is based on an 8 GeV linear proton accelerator which consists of a normal-conducting and a superconducting section. The normal-conducting (warm) section is composed of an ion source, a radio frequency quadrupole, a medium energy beam transport and 16 normal-conducting crossbar H-type cavities that accelerate the beam from 2.5 MeV to 10 MeV (from β=0.0744 to β=0.1422). These warm cavities are separated by superconducting solenoids enclosed in individual cryostats. Beyond 10 MeV, the design uses superconducting spoke resonators to accelerate the beam up to 8 GeV. In this paper, we illustrate the completion of the first normal-conducting crossbar h-type cavity (β=0.0744) explaining in detail the mechanical engineering aspects related to the machining and brazing processes. The radio-frequency measurements and tuning performed at Fermilab on the resonator and the comparisons with the former simulations are also discussed.

WEPMN111 3.9 GHz Superconducting Accelerating 9-cell Cavity Vertical Test Results 2295
  • T. N. Khabiboulline, C. A. Cooper, N. Dhanaraj, H. Edwards, M. Foley, E. R. Harms, D. V. Mitchell, A. M. Rowe, N. Solyak
    Fermilab, Batavia, Illinois
  • W.-D. Moller
    DESY, Hamburg
  The 3rd harmonic 3.9GHz accelerating cavity was proposed to improve beam performances of the FLASH (TTF/DESY) facility. In the frame of collaboration Fermilab will provide DESY with a cryomodule containing a string of four cavities. In addition, a second cryomodule with one cavity will be fabricated for installation in the Fermilab photo-injector, which will be upgraded for the ILC accelerator test facility. The first results of vertical tests of 9-cell Nb cavities didn?t reached the designed accelerating gradient. The main problem is multipactoring in HOM couplers, which leads to quenching and overheating of the HOM couplers. New HOM couplers with improved design integarated to next 9-cell cavities. In this paper we present all results of vertical tests.  
WEPMS057 Innovative Modular, Multiple Power Levels, 325 MHz Spokes Cavities Power Couplers 2475
  • Q. S. Shu, G. F. Chen, F. H. Lu, I. M. Phipps, J. T. Susta
    AMAC, Newport News, Virginia
  • T. N. Khabiboulline, N. Solyak
    Fermilab, Batavia, Illinois
  Funding: Footnotes: The project was funded by the US Department of Energy under contract DE-FG02-05ER84346

In order to increase the protons energy up to 8 GeV in a driver Linac, the particles must be accelerated through various stages and three different power levels (25kW, 100kW and 210kW) are required for the 325 MHz Fermilab Proton Driver couplers. The problem identified by the project is that no High RF power coupler for these cavities has ever been produced using US industrial capabilities. AMAC proposed a novel resolution by development of innovative modular, multiple power levels, 325 MHz spoke cavities power couplers, which to meet three type cavities with one coupler design. The simulation and concept design are presented. The results of HFSS, MAFIA, ANSYS, and Multipacting are also discussed.