Transcript K. Long, 7 November, 2015 Tracker, fabrication plans Contents  Tracker module integration  Tracker  Electronics  Readout  Milestones and plans  Conclusions.

K. Long, 7 November, 2015
Tracker, fabrication plans
Contents

Tracker module integration

Tracker

Electronics

Readout

Milestones and plans

Conclusions
Tracker module integration

Detailing required for:



Patch-panel support on magnet end-flange
Hall probes in warm bore
Supports for VLPC cryostat




Tracker support/location
mechanism in bore
Over-pressure relief
Helium fill (?) in Steps I to
III
Fibre run from patch panel
to VLPCs
Tracker module integration
m
Step I:
m
Step II
Step II.5


m
Fall back!
Yet need a concept

Simplest solution:



Dummy warm bore
Dummy end flange
Engineer beyond
concept only if Step III is
significantly delayed
Tracker module integration

Patch panel and cover

Cover detail to allow diffuser positioning


Magnetic calculations


Iteration required to allow diffuser change with field on?
Holger Witte (Oxford), Jim Rochford (RAL)
Preparation for pressure vessel calculations

Pete Savage
Tracker

Detailing:

Carbon fibre pieces:



Connector flange – thickness
Space frame – detail of feet
Integration:

Hall probes


Number, location, supports
Fibre (and Hall-probe cable) routing
Tracker fabrication

Techniques used for the two prototypes 
Station body:
Single
piece
formed
carbon-fibre
Ribbon fabrication:

Doublet layers formed in delrin mould

Second layer of fibre and glue applied
US
Fibre bundling

Fibres are bundled into groups of 7 and
ribbon placed on vacuum chuck
Aligning the fibres:

Precision alignment of fibres using
precision stage and microscope
Mounting doublet layers on body



Vacuum chuck dowelled in position on jig
Body held in clamp and lowered onto
doublet layer
Precision dowels at each apex of equilateral
triangle
Optical connectors: at station

Ganging: 7 scintillating to 1 clear fibre
Layout:

Connector:

Optical connectors: bulk head


Optical patch panel must hold vacuum
Connector design incorporates o-ring seal
Clear-fibre light guides

Two runs:



Station to patch panel
Patch panel to VLPC
Prototype #1:


‘One piece’;
Two piece (final prototype) being constructed
Japan
Tracker fabrication


Techniques used for the two prototypes
Require to finalise:

QA to be used in:
Bundling
 Connectorisation



QA: bundling/connectorisation
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 32
LED
33
6
7
Fibres
28
8
6
8
9
6
8
10
11
12
20 21 10
13
6 67 98 61 18
2
13 133 205 155 53
9
10 148 234 172 53
8
14
15
2
16
11 22 14
17
37 80 62 130
18
2 74 155 138 68 19
19
3 74 139 135 69 17
20
4 41 66 69 40 12
21
6
3 72 124 69 18
7
3
5 35 69 78 63 38
22
4
6
4 43 123 169 146 82
23
9
4
2 43 169 241 204 95
24
6
25
1809
10 17
1494
9
26 145 209 154 56 20
53 84 48 14 22
26
2
3
11
2465
27
28
29
30
31
32
2 13
3
33
2 24
9
34
12
7
35
72
Tracker fabrication


Techniques used for the two prototypes
Require to finalise:

QA to be used in:
Bundling
 Connectorisation


Station acceptance/characterisation QA

Cosmic-ray rig to measure





Light yield
Uniformity
Efficiency and dead-channels
Schematic diagram:
Cosmic test stand
Required ~ second
quarter calendar
2007
Standard MICE optical
connectors
Light box
Station
Energy filter
Trigger
scintillators
Tracker fabrication


Techniques used for the two prototypes
Require to finalise:

QA to be used in:
Bundling
 Connectorisation


Station acceptance/characterisation QA

Cosmic-ray rig to measure




Light yield
Uniformity
Efficiency and dead-channels
Assembly acceptance/measurement
Verify alignment of full tracker
 

CMM measurements of prototype
P.Savage
CMM measurements:
Data Set 1
Measurements made:
Measurement
Distance Y from the datum
Distance Y from the datum
Distance Y from the datum
Distance Y from the datum
Distance Y from the datum
Distance Y from the datum
Distance Y from the datum
Distance Y from the datum
Item measured
How it was measured
60 points on a 300mm PCD equi-spaced*
60 points on a 260mm PCD equi-spaced*
4 random located points**
4 random located points**
4 random located points**
4 random located points**
4 random located points**
4 random located points**
1032.100 Station 1 fibre plane
1032.000
Distance Y in mm
Data Set
1
2
3
4
5
6
7
8
1031.900
Station 1 fibre plane
Station 2 fibre plane
Station 3 fibre plane
Station 4 fibre plane
Station 1 carbon fibre carrier face
Station 2 carbon fibre carrier face
Station 3 carbon fibre carrier face
1031.800
* Set 1 measurements were taken at a radius where the station surface was more rigid but had many surface irregularities.
* Set 2 measurements were taken at a radius where the station surface was visibly bending under the 6 gram load of the probe but where there were few surface irregulariti
** Due to poor access data sets 3 through 8 were measured using 4 points close to the top of the tracker (Z+100) - see End View
**It was not possible to use the same X and Z locations in each case due to differing fibre routes.
1031.700
Series1
1031.600
For information regarding measurements taken contact Dave Clark, Ian Clark or Peter Savage
1031.500
1031.400
1031.300
0
36
0
30
0
24
0
18
0
12
60
0
Angle in degreees
Mechanical:

Finalise mechanical structure:








Elapsed time estimate: 6 weeks (assumes Geoff Barber available (~10–20%)
Tracker mechanical validation scheme


Make a model of the patch-panel/tracker interface to ensure clearance and handing OK
My belief: we need this, but can face D&S review without. Pick up post KEK test
Ribbon and station QA



Develop testing programme for measurement of stability of final structure
Pete Savage will draft procedure based in experience with four-station prototype
Validation of space envelopes


Detail carbon-fibre station support to incorporate machinable islands to ensure space-frame
parallelism
Detail carbon-fibre space frames
Design support scheme and cable run for Hall probes
Finalise concept for patch panel and patch-panel cover
Design and detail tracker location system
Define installation procedure
Check vacuum tightness of patch-panel optical connector
Develop QA procedures for use in station fabrication
Develop station acceptance QA procedure
Review as soon as Paul Kyberd back from vacation.
Lay plans for full station QA (implies station, r/o etc.) ‘straight away’
Patch-panel cover detailing and FEA



FEA quench-force calculations
Detailing of patch panel and patch-panel cover
FEA and vacuum-vessel calculations
Quench-force calculations in hand: Holger Witte/Jim Rochford
Pete Savage developing ANSYS model to perform pressure-vessel calculations
Electronics

Loan of VLPCs:

Significant:


Loan of VLPCs for KEK test
In coming eighteen months shall require
VLPC test stand for station QA
 Final system for MICE Hall


Cryostat/AFE IIt status 
Cryo Update I
 The cryo-system for the VLPCs has been operated extremely
reliably and stably from May through the end of the KEK TB
 However, it was felt that the thermal-link design could be
made more robust

A bolted concept has now been detailed and will be used in all
subsequent systems
 The drawing package has been “marked-up” for update
 The drawing package is currently in the Fermilab drafting
queue.
 There are a few outstanding issues that still need some
thought


Is the top plate stiff enough against atmospheric pressure?
Can the new thermal link design permit non-positive clamping of
the cassette so that a cassette could be removed from the
cryostat without having to break the cryo-vacuum
Cryo Update II
AFE IIt Update
 The AFE IIt prototypes (10) have arrived and are under test
 The production run of Tript chips is complete, and
approximately 8200 die have been packaged.

Enough for about 500 boards
Electronics

Loan of VLPCs:

Significant:


Loan of VLPCs for KEK test
In coming eighteen months shall require
VLPC test stand for station QA
 Final system for MICE Hall


Analogue front end:

Significant:


Loan of prototype AFE IIs for KEK test
In coming eighteen months shall require
To support D AFE IIt board testing/commissioning
 AFE II(t) boards for test stand and final system


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Implies board firmware development
Imperative: develop ‘local’ MICE expertise
Readout

Rate:

Require to establish ~ 400 events/spill 
Issues that will Need some Thought
 AFE IIt board temperature and bias calibration

Does MICE need a test stand (like D0 has) to do this operation?
 LED pulser data

Plan to dismount wavguides and mount a LED pulser or excite the
fibers with blue LEDs?
 New LVSB Board
 AVNET (timing) board incorporated into LVSB or possibly the
AFE IIt can be programmed to take over the functionality of
the AVNET board
 Rate

If we keep analog and timing information we are limited to:

1/(150 X 19 ns) @ 350 muons per msec of spill
– It is possible that clever (extreme) programming of the AFE IIt can push
this up a bit – 400-450 or so.

If we drop analog and timing and only use discriminators, we can
run at 7 MHz.
Readout

Rate:


Require to establish ~ 400 events/spill
Integration:

Within UNIDAQ have tracker  ToF/Ckov
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But all in one VME crate
Over next 12 (?) months need to move to MICE
DAQ stystem
Milestones:
Preparation for production phase

WBS indicates 15 month build phase:



Need to work through plan for procurement
(e.g. scintillating and clear fibre, carbon
fibre, connectors etc.)
Need to prepare programme for
implementation of production line:


Assume production start January 2006
Produce first production station by 01Apr06?
Propose tracker workshop around ISS
Physics Group w/s


14-21 November 2005 @ Imperial
Date to be fixed by email in next few days
Infrastructure:

VLPC cryostat support:


First iteration with Tony Jones for layout
Other services:



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
with Y.Ivanyushekov
Power
Ethernet
Local computer ‘cluster’
…
will follow
Need installation scheme:

Implies ‘tent’ for some ‘light- or cleanlinesscritical’ operations
Commissioning & operation

Following installation plan need to develop:

Commissioning plan
Cosmics?
 Field off beam?
 One/two trackers?

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Alignment, calibration …
Flag need to work through a ‘straw-man’
scheme
Conclusions:

Much to do!