5 K 60 70 K 250 * This value takes into account the actual voltage distribution on the HWR cavities. Therefore, it is smaller than the value presented in Table 2.7. Single Spoke Resonator I (SSR1) Cavities and Cryomodules Acceleration from 10 to 35 MeV utilizes superconducting cavities with βopt = 0.222 operating at 325 MHz, referred to as Single Spoke Resonator of type 1 or SSR1 (see Figure 3.37) [81]. Figure 3.37: Cut-away view of SSR1 cryomodule designed for PIP-II. RF Design and Optimization of SSR1 Cavities RF design and optimization of the SSR1 cavity was done using Microwave Studio (MWS) software. Figure 3.38 presents the main geometrical parameters used for optimization: LCAV is the cavity length, end-wall to end-wall along beam axis, LIRIS is the iris to iris length, D is the spoke base diameter, W is the spoke width, T is the inner electrode thickness, and h and v are cylindrical shell and end-wall dimensions. Beam dynamics considerations led to the choice of β=0.21 and a 30 mm aperture diameter. Also an iris-to-iris distance, Liris = (2/3) βλ, was chosen. Table 3.4 lists the general requirements to the electromagnetic parameters. Table 3.4: SSR1 electromagnetic parameters Parameter Value Frequency 325 MHz Shape Single Spoke Resonator g, opt 0.215, 0.22 Leff = opt λ 203 mm Iris aperture 30 mm Inside diameter 492 mm Bandwidth (f0/Q) 90 Hz Epk/Eacc 3.84 Bpk/Eacc 5.81 mT/(MV/m) G 84 Ω R/Q 242 Ω Figure 3.38: Cross section of the SSR1 with the main parameters used in the optimization process. Minimization of the peak surface electric field (Epeak) involves W, T and Liris as main parameters, since they define the geometry in the region of high electric field (see Figure 3.39). The ratio D/Lcav and the end cup profile dimensions were optimized to achieve a low peak magnetic field (see Figure 3.40). The corresponding electric and magnetic 3D fields are shown in Figure 3.41. The plots have been generated with Comsol software.
Assets, Change 1 issued 11/29/10 DOE Order 414.1C – Quality Assurance DOE Order 420.1B – Facility Safety DOE Order 430.1B – Real Property Asset Management (2/8/08) DOE Order 430.2B – Departmental Energy, Renewable Energy and Transportation Management DOE Order 450.1A – Environmental Protection Program (6/4/08) DOE STD-1066-99 – Fire Protection Design Criteria DOE STD-1073-2003 – Configuration Management DOE Guide 420.1-2 – Guide for the Mitigation of Natural Phenomena Hazards for DOE Nuclear Facilities and Non-Nuclear Facilities 10 CFR 835 – Radiological Protection Program 10 CFR 851 – Worker Safety and Health Program 10 CRF 851.23 – Safety and Health Standards Internal Fermilab permits and work notifications as described in the Fermilab ES&H Manual (FESHM) Fermilab Director’s Policy Manual () Fermilab Engineering Manual () Enterprise Standards Enterprise standards from regulatory agencies, code bodies and trade organizations also provide requirements for the design and construction of the PIP-II conventional facilities. The Fermilab Engineering Standards Manual provides a comprehensive listing of applicable and adopted building codes and design standards. The applicable standards are listed below: Codes, Standards, and Guidelines International Building Code (IBC) – 2009 Edition International Energy Conservation Code – 2009 Edition International Fire Code – 2009 Edition International Mechanical Code – 2009 Edition Minimum Design Loads for Buildings and Other Structures – ASCE 7-05 Building Code Requirements for Structural Concrete – ACI 318-05 Specification for Structural Steel Buildings – AISC 360-05 Building Code Requirements for Structural Concrete and Commentary – ACI 318-08 Building Code Requirements for Masonry – ACI 530-05 Illinois Plumbing Code – 2004 Illinois Department of Public Health Codes Illinois IEPA NFPA 101 Life Safety Code – 2009 Edition NFPA 13 – Standard for the Installation of Sprinkler Systems – 2010 Edition NFPA 24 – Standard for the Installation of Private Fire Service Mains and Their Appurtenances – 2010 Edition NFPA 30 – Flammable and Combustible Liquids Code – 2008 Edition NFPA 55 – Compressed Gases and Cryogenic Fluids Code – 2010 Edition NFPA 70 – National Electrical Code – 2008 Edition NFPA 70E – Standard for Electrical Safety in the Workplace – 2009 Edition