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