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Title |
Page |
| MOPAS053 |
LANSCE Vacuum System Improvements for Higher Reliability and Availability
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557 |
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- T. Tajima, M. J. Borden, A. Canabal, J. P. Chamberlin, S. Harrison, F. R. Olivas, M. A. Oothoudt, J. J. Sullivan
LANL, Los Alamos, New Mexico
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The Los Alamos Neutron Science Center (LANSCE) accelerator, an 800-MeV proton linac with a storage ring, has been operated over 30 years since early 1970s. Due to the aging and radiation damage of equipment, cables and connectors, the number of troubles is increasing. In order to reduce the time for unscheduled maintenance, we have implemented a system to catch a symptom of degrading vacuum and send an email automatically. We have been testing this system since July 2006. This paper describes this alert system and our experience. In addition, we will describe our plan for modernizing the vacuum system in the next few years.
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| WEPMS018 |
Superconducting Materials Testing with a High-Q Copper RF Cavity
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2370 |
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- A. Canabal, T. Tajima
LANL, Los Alamos, New Mexico
- G. B. Bowden, V. A. Dolgashev, J. R. Lewandowski, C. D. Nantista, S. G. Tantawi
SLAC, Menlo Park, California
- I. E. Campisi
ORNL, Oak Ridge, Tennessee
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Magnesium diboride (MgB2) has a transition temperature (Tc) of ~40 K, i.e., about 4 times higher than niobium (Nb) that has been used for recent accelerators. The studies in the last 3 years have shown that it could have about one order of magnitude less RF surface resistance (Rs) than Nb and much less power dependence compared to high-Tc materials such as YBCO up to ~400 Oe. The tests to check the RF critical magnetic field, an important parameter to determine the feasibility for accelerator application, are underway. We are planning to test different thickness films and with different coating methods. This paper describes the results obtained so far. One of the objectives is to verify Gurevich's theory of getting higher critical field than Nb by adding a very thin layer (less than penetration depth) to Nb. In addition, some CW tests on power dependence up to higher magnetic fields are planned and some results will be shown if available at the time of conference.
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| WEPMS031 |
Development of a Temperature Mapping System for 1.3-GHz 9-Cell SRF Cavities
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2406 |
| |
- A. Canabal, P. Chacon, N. A. Gillespie, M. A. Madrid, T. Tajima
LANL, Los Alamos, New Mexico
- J. D. Bowyer
NMSU, Las Cruces, New Mexico
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The mapping of outer wall temperature during the vertical test of a superconducting radio-frequency (SRF) cavity has been one of the most useful tools to detect bad spots of the cavity. However, few systems except a rotating-arm type one have been developed so far for 9-cell cavities. Since it will be an essential tool to identify the failure of the cavities, we started to develop a fix-type temperature mapping system that will enable us to map the temperature of 9-cell cavities in a much shorter time than rotating-arm type. This paper describes the design, status of the development and hopefully some results of the mapping of actual cavities.
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| WEPMS032 |
Pre-conceptual Design of Automated Systems for SRF Cavity Assembly and Optical Inspection
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2409 |
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- T. Tajima, M. J. Borden, A. Canabal, T. A. Harden, P. C. Pittman
LANL, Los Alamos, New Mexico
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The International Linear Collider (ILC) will require ~20,000 Superconducting Radio- Frequency (SRF) cavities. Improving the yield of high-gradient (>35 MV/m) cavities is currently one of the most critical issues for the ILC. The LANL has been tasked to analyze the failure and feedback the results to the industry and academia. We have started an effort to develop a pre-conceptual design of an automated system to optically inspect the inner surface that showed heating with a thermometry system. We have also started a pre-conceptual design of an automated system for assembling and sealing the flanges after high-pressure rinsing in the clean room. This could reduce the chance of particle contamination due to touch labor, leading to a field emission free cavities and higher yield of high-gradient cavities.
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