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The effect of chrome adhesion layer on quartz resonator aging.

Description: This SAND report documents a late start LDRD designed to determine the possible aging effects of a quartz resonator gold adhesion layer. Sandia uses quartz resonators for applications. These applications require a very stable frequency source with excellent aging (low drift) characteristics. These parts are manufactured by one of our qualified vendors outside Sandia Laboratories, Statek Corp. Over the years we, Sandia and the vendor, have seen aging variations that have not been completely expl… more
Date: March 1, 2011
Creator: Wessendorf, Kurt O. & Ohlhausen, James Anthony
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Tests of a tuner for a 325 MHz SRF spoke resonator

Description: Fermilab is developing 325 MHz SRF spoke cavities for the proposed Project X. A compact fast/slow tuner has been developed for final tuning of the resonance frequency of the cavity after cooling down to operating temperature and to compensate microphonics and Lorentz force detuning [2]. The modified tuner design and results of 4.5K tests of the first prototype are presented. The performance of lever tuners for the SSR1 spoke resonator prototype has been measured during recent CW and pulsed test… more
Date: March 1, 2011
Creator: Pishchalnikov, Y.; Borissov, E.; Khabiboulline, T.; Madrak, R.; Pilipenko, R.; Ristori, L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Room temperature detector array technology for the terahertz to far-infrared.

Description: Thermal detection has made extensive progress in the last 40 years, however, the speed and detectivity can still be improved. The advancement of silicon photonic microring resonators has made them intriguing for detection devices due to their small size and high quality factors. Implementing silicon photonic microring or microdisk resonators as a means of a thermal detector gives rise to higher speed and detectivity, as well as lower noise compared to conventional devices with electrical readou… more
Date: October 1, 2011
Creator: Camacho, Ryan; Shaw, Michael; Zhang, X.; Tao, Hu; Lentine, Anthony L.; Wright, Jeremy Benjamin et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamental damper power calculation of the 56MHz SRF cavity for RHIC

Description: At each injection period during RHIC's operation, the beam's frequency sweeps across a wide range, and some of its harmonics will cross the frequency of the 56MHz SRF cavity. To avoid excitation of the cavity at these times, we designed a fundamental damper for the quarter-wave resonator to damp the cavity heavily. The power extracted by the fundamental damper should correspond to the power handling ability of the system at all stages. In this paper, we discuss the power output from the fundame… more
Date: March 28, 2011
Creator: Wu, Q.; Bellavia, S.; Ben-Zvi, Ilan; Grau, M.; Miglionico, G. & Pai, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of the fundamental power coupler and photocathode inserts for the 112MHz superconducting electron gun

Description: A 112 MHz superconducting quarter-wave resonator electron gun will be used as the injector of the Coherent Electron Cooling (CEC) proof-of-principle experiment at BNL. Furthermore, this electron gun can be the testing cavity for various photocathodes. In this paper, we present the design of the cathode stalks and a Fundamental Power Coupler (FPC) designated to the future experiments. Two types of cathode stalks are discussed. Special shape of the stalk is applied in order to minimize the RF pow… more
Date: July 25, 2011
Creator: Xin, T.; Ben-Zvi, Ilan; Belomestnykh, S.; Chang, X.; Rao, T.; Skaritka, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mechanical design of 56 MHz superconducting RF cavity for RHIC collider

Description: A 56 MHz Superconducting RF Cavity operating at 4.4K is being constructed for the RHIC collider. This cavity is a quarter wave resonator with beam transmission along the centerline. This cavity will increase collision luminosity by providing a large longitudinal bucket for stored bunches of RHIC ion beam. The major components of this assembly are the niobium cavity with the mechanical tuner, its titanium helium vessel and vacuum cryostat, the support system, and the ports for HOM and fundamenta… more
Date: March 28, 2011
Creator: Pai, C.; Ben-Zvi, Ilan; Burrill, A.; Chang, X.; McIntyre, G.; Than, Y. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Survey of SRF guns

Description: Developing Superconducting RF (SRF) electron guns is an active field with several laboratories working on different gun designs. While the first guns were based on elliptic cavity geometries, Quarter Wave Resonator (QWR) option is gaining popularity. QWRs are especially well suited for producing beams with high charge per bunch. In this talk we will describe recent progress in developing both types of SRF guns. SRF guns made excellent progress in the last two years. Several guns generated beams… more
Date: July 25, 2011
Creator: Belomestnykh, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multipacting Simulation on Half Wave Resonantor for Beta 0.53

Description: In the driver linac of the Facility for Rare Isotope Beams (FRIB), multipacting is an issue of concern for the superconducting resonators, which must accelerate the ion beams from 0.3 MeV per nucleon to 200 MeV per nucleon. While most of the multipacting bands can be conditioned and eliminated with RF, hard multipacting barriers may prevent the resonators from reaching the design voltage. Using the ACE3P code suite, multipacting bands can be computed and analysed with the Track3P module to iden… more
Date: August 12, 2011
Creator: Ge, Lixin; Li, Zenghai; Ko, Kwok; Popielarski, John; Hartung, Walter & Holzbauer, Jeremiah
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and first cold test of BNL superconducting 112 MHz QWR for electron gun applications

Description: Brookhaven National Laboratory and Niowave, Inc. have designed, fabricated, and performed the first cold test of a superconducting 112 MHz quarter-wave resonator (QWR) for electron gun experiments. The first cold test of the QWR cryomodule has been completed at Niowave. The paper discusses the cryomodule design, presents the cold test results, and outline plans to upgrade the cryomodule for future experiments. A quarter-wave resonator concept of superconducting RF (SRF) electron gun was propose… more
Date: March 28, 2011
Creator: Belomestnykh, S.; Ben-Zvi, Ilan; Boulware, C. H.; Chang, X.; Grimm, T. L.; Siegel, B. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cryogenic sub-system for the 56 MHz SRF storage cavity for RHIC

Description: A 56 MHz Superconducting RF Storage Cavity is being constructed for the RHIC collider. This cavity is a quarter wave resonator that will be operated in a liquid helium bath at 4.4 K. The cavity requires an extremely quiet environment to maintain its operating frequency. The cavity, besides being engineered for a mechanically quiet system, also requires a quiet cryogenic system. The helium is taken from RHIC's main helium supply header at 3.5 atm, 5.3K at a phase separator tank. The boil-off is … more
Date: March 28, 2011
Creator: Huang, Y.; Than, R.; Orfin, P.; Lederle, D.; Tallerico, T.; L., Masi et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Engineering design of vertical test stand cryostat

Description: Under Indian Institutions and Fermilab collaboration, Raja Ramanna Centre for Advanced Technology and Fermi National Accelerator Laboratory are jointly developing 2K Vertical Test Stand (VTS) cryostats for testing SCRF cavities at 2K. The VTS cryostat has been designed for a large testing aperture of 86.36 cm for testing of 325 MHz Spoke resonators, 650 MHz and 1.3 GHz multi-cell SCRF cavities for Fermilab's Project-X. Units will be installed at Fermilab and RRCAT and used to test cavities for … more
Date: March 1, 2011
Creator: Suhane, S. K.; Sharma, N. K.; Raghavendra, S.; Joshi, S. C.; Das, S.; Kush, P. K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Superconducting 112 MHz QWR electron gun

Description: Brookhaven National Laboratory and Niowave, Inc. have designed and fabricated a superconducting 112 MHz quarter-wave resonator (QWR) electron gun. The first cold test of the QWR cryomodule has been completed at Niowave. The paper describes the cryomodule design, presents the cold test results, and outline plans to upgrade the cryomodule. Future experiments include studies of different photocathodes and use for the coherent electron cooling proof-of-principle experiment. Two cathode stalk option… more
Date: July 25, 2011
Creator: Belomestnykh, S.; Ben-Zvi, Ilan; Boulware, C. H.; Chang, X.; Grimm, T. L.; Rao, T. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multipacting Analysis for the Half-Wave Spoke Resonator Crab Cavity for LHC

Description: A compact 400-MHz half-wave spoke resonator (HWSR) superconducting crab cavity is being developed for the LHC upgrade. The cavity shape and the LOM/HOM couplers for such a design have been optimized to meet the space and beam dynamics requirements, and satisfactory RF parameters have been obtained. As it is known that multipacting is an issue of concern in a superconducting cavity which may limit the achievable gradient. Thus it is important in the cavity RF design to eliminate the potential MP… more
Date: June 23, 2011
Creator: Ge, Lixin & Li, Zenghai
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cerenkov Radiator Driven by a Superconducting RF Electron Gun

Description: The Naval Postgraduate School (NPS), Niowave, Inc., and Boeing have recently demonstrated operation of the first superconducting RF electron gun based on a quarter wave resonator structure. In preliminary tests, this gun has produced 10 ps long bunches with charge in excess of 78 pC, and with beam energy up to 396 keV. Initial testing occurred at Niowave's Lansing, MI facility, but the gun and diagnostic beam line are planned for installation in California in the near future. The design of the … more
Date: March 7, 2011
Creator: Poole, B R & Harris, J R
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen

Description: A compact two-gas sensor based on quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for trace methane and ammonia quantification in impure hydrogen. The sensor is equipped with a micro-resonator to confine the sound wave and enhance QEPAS signal. The normalized noise-equivalent absorption coefficients (1{sigma}) of 2.45 x 10{sup -8} cm{sup -1}W/{radical}Hz and 9.1 x 10{sup -9} cm{sup -1}W/{radical}Hz for CH{sub 4} detection at 200 Torr and NH{sub 3} detection at 50 Torr were demo… more
Date: November 2, 2011
Creator: Wright, J.; Ferguson, B.; Peters, B. & Mcwhorter, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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