1. Absorber Design Details Mary Anne Cummings MICE MEETING Columbia June 13, 2003

2. What details? 1.Windows (absorber and vacuum) 2.TPG high voltage concerns (and other electrical concerns) 3.Off-center options 4.Installation scenario 5.Testing procedure

3. Window requirements FNAL Requirements (vacuum): 1.Burst test 5 vacuum windows at room temp. to demonstrate a burst pressure of at least 75 psid for all samples. (pressure exerted on interior side of vacuum volume). 2.Non-destructive tests at room temperature: a.External pressure to 25 psid to demonstrate no failures: no creeping, yielding, elastic collapse/buckling or rupture b.Other absorber vacuum jacket testing to ensure its integrity FNAL Requirements (absorber) 1.Room temp test: pressurize to burst ~ 4 X MAWP (25 psi 2. Cryo test: a) pressure to below elastic limit to confirm consistency with FEA results b) pressure to burst (cryo temp – LN2) ~ 5 X MAWP from ASME: UG 101 II.C.3.b.(i) Plus non-destructive certification  New review required if the windows are welded!!

4. H2 VAC LH2 Instrumentation

5. Flammable Gas Electrical Safety Concerns for detectors: Power per channel Feedthroughs Seals 1.Scenario (2) is the configuration that would be consistent with a safe TPG detector installation. 2.All electronics will have to conform to European safety standards w.r.t. flammable gas. 3.RF & Vacuum windows considered a “hazard/safe” barrier. 4.“Gas-purged” box necessary for non- instrinsically safe electronics within 15 ft. radius of hydrogen (FNAL code) Current conclusion: not a problem – yet!

6. Off center solid absorber issue Off center absorber position: > what is the change in   0 -   1 /   0 ? < 20% if the absorber had no longitudinal extent

7. Schedule and assembly Assembly: –Windows manufacture/testing NIU/FNAL –KEK fabricate the absorber heat exchanger associated piping connections and absorber vacuum chamber – NIU/IIT fabricate outer containment vessel, supports, windows for vacuum and absorber, –LBNL/Oxford provide the focussing coils with coils support structures. –Absorber assembly/testing at FNAL –Coil assembly and absorber integration at RAL

8. Testing procedure 1.Window tested separately 2.Windows tested on absorber (leak checks) 3.Field measurements of coils 4.Purging and filling cycle 5.Instrumentation check and stability monitoring