collab store 6/6/07 #1 edmedm martin cooper, los alamos co-spokesperson for the edm project for...
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Collab Store 6/6/07 #1
EDM
Martin Cooper, Los AlamosCo-spokesperson for the EDM Project
for presentation to
The EDM CollaborationLos Alamos, NM
June 7, 2007
Preparations for the nextUCN storage time measurement
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Collab Store 6/6/07 #2
EDM Outline
I) ReviewII) New AssemblyIII) Schedule
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Collab Store 6/6/07 #3
EDM Storage Time in a Bottle
upholewn 111111
3
where n is the neutron lifetime,
w is the wall lifetime, hole is the losses through a hole 3 is absorption lifetime, up is upscattering lifetime. Preliminary result > 250 -300 s
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Collab Store 6/6/07 #4
EDM Experimental Layout in Area B
UCN
Coat withUCN absorber
Switch
Diamond coatedguide
1/2" hole
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Collab Store 6/6/07 #5
EDM 3D
Storage CellLN2 Cryosat
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Collab Store 6/6/07 #6
EDM
Storage Time
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
0 5 10 15 20 25 30 35 40 45 50
Time from Switch Opening (min.)
Co
un
ts in
n D
etec
tor/
min
.
Delay 11
Delay 7
Delay 21
Delay 17
Delay 4
Storage Time
1/Fill Time = Production Rate - Loss Rate
Absorption Time
1/Detector Loss Rate
Storage Time
UCN Storage Time Measurement
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Collab Store 6/6/07 #7
EDM UCN Stored for 100 s
Time (s)
Cou
nts
(/s)
UCN filling from SD2 source
Bottle sealed and source off
UCN from bottle
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Collab Store 6/6/07 #8
EDMMechanism inside the Vacuum Vessel
UCN fromSD2 Source
CoolingLines
ShutterMechanism
EncasedStorage Cell
Shutter Block
Part of Radiation Shield
Floor ofVacuum Vessel
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Collab Store 6/6/07 #9
EDM Shutter Open
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Collab Store 6/6/07 #10
EDM Shutter Aligned
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Collab Store 6/6/07 #11
EDM Shutter Closed
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Collab Store 6/6/07 #12
EDM Shutter Seal
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Collab Store 6/6/07 #13
EDM Entry to Enclosed Box
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Collab Store 6/6/07 #14
EDM Cell Drawing
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Collab Store 6/6/07 #15
EDM Corner Detail
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Collab Store 6/6/07 #16
EDM Corner Mating
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Collab Store 6/6/07 #17
EDM Coating
• Working with LANL polymer chemists• Spray coating does not yet work• Wipe on deuterated styrene – 2 coats• Performed a crazing test with 2 cycles to 77 K• Trying to decide how to make sure no spots
are missed
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Collab Store 6/6/07 #18
EDM Temperature
• Unsure in previous test what temperature was on the inside of the cell since diode was on cooling plate with only partial coverage of cell
• Performing a test on old cell with diodes in a number of strategic locations
• New cell cooling scheme to get better thermal contact
• Performing a test with new cooling configuration
• Temperature cycle will include a bake out under vacuum at about 50° C for several days prior to any measurements
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Collab Store 6/6/07 #19
EDM Enclose Box
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Collab Store 6/6/07 #20
EDM Cooling Detail
Spring loadedAl cooling plate
Copper Mesh
Thin copperTransfer sheet
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Collab Store 6/6/07 #21
EDM Schedule
• Very uncertain due to UCNA requirements• One run of 3-4 days in late June to mid-July• A second run of 3-4 days about a month after
the first run