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Mike Neubauer Muons, Inc.

This conceptual design presents a method for feeding RF through coils into a High Current Collider (HCC). The design addresses engineering considerations and does not seem to have any impossible constraints. It emphasizes the importance of having enough room for an RF coaxial feed in the cavity module. This design incorporates critical RF concepts proposed by Milorad Popvic, Al Moretti, Mohammad Alsharo’a, and Mike Neubauer.

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Mike Neubauer Muons, Inc.

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  1. RF System for an HCCAll the critical RF concepts have been suggested for SBIRs at one time or another by Milorad Popvic, Al Moretti, Mohammad Alsharo’a, and Mike Neubauer Mike Neubauer Muons, Inc. Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  2. Assumptions • Individual cavities are fed with RF for an HCC • In general, the more the cavities per HCC period, the less the RF input power per cavity • The coax feed into the cavity can use 50% of the length of a single cavity module or cell. • Each cavity has its own RF source phase matched to its neighbors. • Magnet Coils fit around the outside diameter of the cavity wall. Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  3. Assumptions, continued • Ceramic loaded cavities will reduce the OD of the cavity. • The drawings show ceramic loading of one style, but there are different ways to load the cavity. • Grids are an optimum choice for the use of high pressure gas in the HCC. • They will be shown, but other choices can be made. • The RF system that is used to feed each individual module of the HCC is not shown. Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  4. Cavity Module Concept • Single pill-box cavities are made that are aligned to create an HCC. • Each Cavity has it’s on set of magnet coils at 50% fill factor along the length of the cell Grid Window Magnet coils Pill box cavity Coaxial Feed Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  5. An Example of Cavity Detail Formed Grid Ceramic Filled Cavity Plated Copper Magnetic Coupling Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  6. Ez as a function of Radius for various ceramic loaded 325 MHz “pillbox” cells Zshunt= 6 54 100 MW/m Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  7. Input Power per Cell (neglecting ceramic losses) • Pin(v/m)=[V(v/m)]2/Zshunt(MW/m) • Pin=252/Z for 25MV/m gradient • For copper at RT Z=54 MW/m for an “optimum” ceramic loaded cavity • Pin=11.6 MW/m or 463 kw per cell • At 70K, Z ~4.5*ZRT due to copper Ploss • Pin=2.55 MW/m or 102 kw per cell Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  8. Ceramic Losses For full ceramic loaded cavity Q=1/tand Q70K~20,000 Copper only Q70K~100,000 Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  9. Complete HCC---Single Period Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  10. Cavity Detail • Ceramic Loaded Cavity reduces size • Need to verify losses at operating temperature • May need charge dissipative coating on surface seen by the beam (currently working on a related SBIR) • Copper Plated and Post-machined • Removes the problem of packaging and voids between ceramic and metal • Flat moly grid anchored by ceramic ring solves distortion problems. (Puts grid in tension going down to 70K) • Ceramic ring adds mechanical support • Coaxial Feed can be reduced in size • Need to measure power capability in High Pressure Gas Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  11. This is a 25 cavity per period 400 MHz design • Approximate Diameter at the coax flange is 40” Magnet Coil Pill box Cavity Coax Feed per cavity Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

  12. Summary • A conceptual design for putting RF through coils into an HCC is presented. • Engineering Design issues need to be resolved, and there do not seem to be any “impossible” constraints. • The most important aspect is: 50% of the cavity module is enough room for an RF coax feed. • All the critical RF concepts have been suggested for SBIRs at one time or another by Milorad, Moretti, Mohammad, and Neubauer. Mike Neubauer Muons, inc. MCDW BNL Dec 1-3

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