Alternate ZDC Design Edwin Norbeck Anthony Moeller Ahmet Sedat Ayan Yasar Onel University of Iowa For Eclipse 2006.

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Presentation transcript:

Alternate ZDC Design Edwin Norbeck Anthony Moeller Ahmet Sedat Ayan Yasar Onel University of Iowa For Eclipse 2006

Ed Norbeck U of IowaLiquid ZDC Eclipse062 Desirable features Radiation hard, useful even with luminosity upgrade Output corrected for off-center neutrons Simple and low cost

Ed Norbeck U of IowaLiquid ZDC Eclipse063 Basic idea Tungsten adsorber Liquid for: Čerenkov radiator light pipe radiation shield for PMTs Contained in polished aluminum tank, open at top Liquid fills tank up to PMTs (60 cm deep)

Ed Norbeck U of IowaLiquid ZDC Eclipse064 Transverse leakage Tests and simulations only for E far below 2.76 TeV Leakage out side compensated by light from Cerenkov fluid on outside edges. Leakage out top and bottom compensated by extra centimeter of tungsten at top and bottom.

Ed Norbeck U of IowaLiquid ZDC Eclipse065 WWWWWWWWW ION CHAMBER EMHadronic Section View from the top showing the location of the W absorbers

Ed Norbeck U of IowaLiquid ZDC Eclipse066 Absorber Tungsten blocks: Polished and flashed with aluminum for better light reflection Hooks on top for easy removal

Ed Norbeck U of IowaLiquid ZDC Eclipse067 Horizontal subdivision Use thin, polished aluminum sheets that go from the bottom of the tank up the level of the PMTs Can subdivide in both X and Y directions

Ed Norbeck U of IowaLiquid ZDC Eclipse068 Fluid candidates Requirements: For maximum Čerenkov light High refractive index to generate more light Refractive index to match PMTs Transparent over wave lengths accepted by PMTs Low density (so shower particles have greater range)?

Ed Norbeck U of IowaLiquid ZDC Eclipse069 Fluid candidates For convenience: Not corrosive Not a health hazard Not too volatile or fire hazard Inexpensive in adequate purity Reasonable viscosity

Ed Norbeck U of IowaLiquid ZDC Eclipse0610 Fluid candidates Water n = 1.33 (low)  = 1.00 Advantages: availability, small spills evaporate Disadvantages: Small n, corrosive, things grow in it Mineral oil n = 1.46  = 0.78 Advantages Can use MiniBooNE Mineral Oil (10 6 l at FNAL) Disadvantages: Cleanup messy Ethylene glycol n = 1.43  = 1.12 Antifreeze without additives Advantages: Cleanup easy with water (not volatile)

Ed Norbeck U of IowaLiquid ZDC Eclipse0611 Conclusions Need additional simulations to determine optimum size and spacing of tungsten blocks A ZDC of this design Gives large signals Is inexpensive Can be constructed in a short amount of time Can be easily subdivided in horizontal directions