M. Takahashi, 3 May 2023
Station Acceptance (SA)
11/05/2006 Imperial College London 2
• Space
• Source
• X-Y stage
• Station and source holders
• Light-tight box with patch panel
• waveguides, connectors
• (Readout and DAQ System)
What we need
11/05/2006 Imperial College London 3
Station acceptance (SA) test carried out at Imperial College
• Rm537 (former CMS crystal lab)– allocated for MICE– still needs to be cleared out…
(some CMS crystal-related things will be removed shortly, so there will be enough space for TA test)
• Basement– enough space but people from other experiments would enter
The apparatus will sit on top of a table for easy access At least one yellow light in the room over the light-tight box
Space
11/05/2006 Imperial College London 4
Sketch of SA Setup
patch panel
tocontroller
toVLPC
garage position station holder + jig
• Station remains at a fixed position defined by the jig• Source held by an extended arm firmly attached to the X-Y stage
… scan across the station from the top surface
stage
11/05/2006 Imperial College London 5
Radioactive sources at Imperial HEP (consultation with Mark Raymond)
• Co-60 (~1MeV)– available but not recommended…– the stage and the source holder have to support the shield
would have to go for strength rather than precision
• Co-57 (122keV)– would be ok but not enough activities
(months to arrive if we order)
• Am-241 (60keV)– sufficient supply
Source
11/05/2006 Imperial College London 6
Programmable X-Y stage to move the source across the station plane(with flexibility for other future purposes)
• Stage– strength or precision?
(because the source will be held on an extended arm, the stage needs to survive a large enough torque)
• Supplementaries:– motor– controller– linear encoder? (measures the actual position)
• Cost: stage + motor + linear encoder + controller ~2k x 2 + ? + ~500 x 2 + ~1k = 7k GBP (better estimate due to arrive in few days)
• It will take 2,3 months to arrive
X-Y Stage
11/05/2006 Imperial College London 7
Station & Source Holders
station holder + jigstage
Jig + holder for the station• similar to those used for the assembly• jig bolted onto the base of the light box
Holder for the source• arm + leg firmly attached to the stage• hold source ~few cm above doublet layers
~40cm
~20cm
adjustable ~5cm
source holder
~5cm
11/05/2006 Imperial College London 8
Light box (needs to be ordered)• >= 70cm(d) x 130cm(w) x 60cm(h)
(doors on the front face)• Heavy base with bolt holes • Holes on the side walls
– for patch panel: ~15cm x 25cm– for the stage controller cables:
~ Ø10cm with some kind of light seal
• Patch panel
Light-tight Box and Patch Panel
actual hole on the box
bolt connector holes
O-ring typesealing?
light box front face
11/05/2006 Imperial College London 9
• Internal waveguides– lengths: same for all for simplicity and flexibility 1m– connections to the station:
probably better to connect them outside the light box(station held at 20cm, connectors still reachable if necessary)
• External waveguides ~1m
Waveguides
11/05/2006 Imperial College London 10
• Discuss if the plan is good enough and feasible + finalise the details
• Which source and stage? place an order
• Reference measurement for the source
• Position survey system (doing this from data is enough?)Independent measurement of the station position/orientation with
respect to the source
To Do
M. Takahashi, 3 May 2023
END
