Absorber Design Details

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 (absorber)
• 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)
  

• FNAL Requirements (vacuum)
• 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).
• Non-destructive tests at room temperature
• External pressure to 25 psid to demonstrate no
  failures no creeping, yielding, elastic
  collapse/buckling or rupture
• Other absorber vacuum jacket testing to ensure
  its integrity

• Plus non-destructive certification
• New review required if the windows are welded!!

4
LH2 Instrumentation
H2
VAC
5
Flammable Gas Electrical Safety
Concerns for detectors Power per channel
Feedthroughs Seals

• Scenario (2) is the configuration that would be
  consistent with a safe TPG detector installation.
• All electronics will have to conform to European
  safety standards w.r.t. flammable gas.
• RF Vacuum windows considered a hazard/safe
  barrier.
• 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
• gt what is the change in b0 - b1 / b0?
• lt 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