fermilab...agenda of feb. 6, 1992 gem muon system boston mi.ni-review:. (i) morning session: 8:15 am...
TRANSCRIPT
GEM Muon System Meeting - Boston
February 6, 1992
Abstract:
GEM TN-92-61
Transparencies and agenda from the GEM Muon System Meeting on February 6, 1992 held in Boston.
Agenda of Feb. 6, 1992 GEM Muon System Boston Mi.ni-review:.
(I) Morning Session: 8:15 AM to 1:30 PM
Location: Charles Stark Draper Lab., Broadway, Cambridge, MA
(1) Welcome to Draper Lab. Bill Stanton - Vice-president
(2) GEM Muon System - general remarks Frank Taylor - MIT
8:25-8:30
8:30-9:45
(3) Muon system engineering - technical overview and managment Frank Nimblett - Draper 8:45-9:15
(4) Support structure layout Mike DePiero - Draper
(5) Analysis of support structure and interface to magnet Rick Sapienza - Draper
(6) Layout of muon chambers Tony Kondoleon - Draper
(7) Chamber alignment scheme Joe Paradiso - Draper
B R E A K
(8) Tour of Draper Lab: CAD/CAM facilities Optics Lab
(9) Working Lunch at Draper Lab.
Discussion of engineering of chamber technologies
9:15-9:45
9:45-10:15
10:15-10:45
10:45-11:15
11:15-11:30
11:30-12:15
12:30-1:30
- (a) Pressurized Drift Tubes Carl Bromberg - MSU (b) Limited Streamer Drift Tubes Jim Kelsey - MIT (c) Resistive Plate Counters - MIT - (d) Cathode Strip Chambers Scott Whitaker - BU
(II) Afternoon Session: 1:45 PM to 5:00 PM
Tours of MIT and Boston University
(1) Tour of MIT labs: RPC
LSDT
(2) Tour of Boston University labs:
(Hann Chang - MIT) Louis Osborne - MIT
PDT labs Steve Ahlen - BU CSC labs Scott Whitaker - BU
(3) Closeout session: Rm 261 Physics Research Bldg. BU
1:45-2:45
3:00-4:00
4:00-5:00
GEM Muon System Status: 216/92 FET
Short range goal:
- Specify new baseline design by Tucson Meeting 3/8/92
- Continue R&D effort on chamber technologies
- Tracking barrel: PDT and LSDT - Triggering barrel: RPC
- Tracking endciaps: CSC - Triggering endcaps: CSC
What Is needed for short range goal:
- Design which meets resolution specifications
- Need larger lever arm (impact on mag. and cal.) - Need superlayer to superlayer alignment: C1ext = 25µm - Need forward field shaper (FFS) - May need more chambers In barrel If o0 :::: I oo µm
(chamber conf\gurat\on: 6-16-6)
- Conceptual design for support structure
- Concept for chamber alignment
- Concept for triggering (barrel and endcaps)
Longer term goals: EDR
- Decide chamber technologies by end of summer '92
- Complete R&D efforts for EDA and focus engineering on chosen technolgles
- Design support structure and alignment
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F. Nlmblett 21 January 1992
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~
MUON SYSTEM OVERVIEW AND
MANAGEMENT STATUS
FRANK NIMBLETT
06 February 1992 (617) 258-1393 (617) 258-1131 FAX
P.RA,LQCi>
• Overview of Muon system concept
•• Barrel Region: Pressurized Drift Tubes (PDTs) or Limited Streamer Drift Tubes (LSDTs) attached to modular aluminum truss structures (16 per magnet half).
•• End cap region: Cathode Strip Chambers (CSCs) of Trapezoidal Shape also attached to modular aluminum truss structures (16 per magnet half).
•• Muon Support Structure is to be a large space-frame assembly made up of the 16 modules per end. Forward region support structure will be attached to the barrel region.
•• Alignment of chambers within a layer plus the layer to layer will be accomplished with straight-line monitors.
•• Assembly of muon system presumes movable magnet halves and an Integral Calorimeter design.
RRA.P.lQCi>
• Current Status
•• Magnet Dimensions remain at 16.6m ID with an overall magnet half length of 15m and a field of 0.8T with a calorimeter support tube which is 8.0 m OD and 12 m In length. In addition, there is now a forward field shaper starting at Z:8.5m and going at least to Z:16.5m.
•• This magnet I calorimeter configuration combined with 8-8-4 layering on the superlayers In the barrel region of the muon system yield approximately 8% muon resolution @500GeV/c.
•• Communications with Mark Rennich indicate the possibility of a significantly smaller Outside Radius calorimeters, 3.3 to 3.2 m OR.
•• Muon system resolution @ 90° Improves with a smaller calorimeter OD, a larger magnet ID, higher magnetic field, or the addition of more measurement layers per superlayer.
P.RARlQCi>
. i ' '
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GEM MUON SYSTEM Integrated Calorimeter Option
18 Seclor Amly ( 22.5°) (B.,.,... Region module)
1, .' .1 3.2m
View IA•/A.
F. Nlmblett 21January1992
3.9m
• Parametized PDT Configuration •• Developed Excel spreadsheet to account for all practical
variables in a PDT-based barrel region system.
.. PDT selected due to ease of modeling.
•• Inputting all parameters yields chamber dimensions, positlons,tube counts by layer, total tube count, chamber midpoints, ~R for sagitta calculations, a sagitta calculation at 500 GeV/c etc.
•• This data Is then used to generate ClarisCad layouts or to modify existing dwgs.
.. As chamber detail design information improves, all chamber designs will be included in this large spreadsheet and additional output Information such as resolution, weights and center of gravity data will be available.
.. Finally this rather lengthy srreadsheet will eventually form the source document which wll be linked automatically to other smaller region spreadsheets which will clearly define the system parameters.
QRA,!P.D
GEMPOT1/A
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Page2
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Page3
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Z=6000 Z=6100 Z=8500
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:10.90° :::::::.-----:9.39°
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( 1 Omm RPCs 1/0/0) F. NIMBLETT GEM920131
• Channel Count Comparison PDT vs LSDT
1.5" PDTs Total Channels 1" LSDTs I Total Channels "8/8/4" "8/8/4" "2·3-4" 105216 "1·2·2" I 85606 "8/8/4" "8/8/4" "2-4-4" 120320 "1·2·2" I 85606
"8/16/8" "8/16/8" "2·3-4" 187392 "1·2·2" I 156134
"8/16/8" "8/16/8" "2-4-4" 217088 t .. :: "1·2·2" I 156134 "8/8/4" I "8/8/4"
"1·2·2"tt 60160 tt - "1·2·2" I 85606 "8/16/8" I "8/16/8" ~. :
Chambers Der La er "1·2·2"tt 108544 tt t;m "1·2·2" I 156134 ** Indicates wires ganged in serial chambers
QRAPLQ[i)
• Draper Task Definition:
Tasks: Design of muon support structures, Design of interface hardware, Alignment of muon system, Muon system Integration, Muon System Cost Estimate.
• Both Design tasks are secure with talented and experienced designers. {Tony Kondoleon and Mike DePiero will work the two major mechanical design tasks)
• Specific Structural Analysis personnel will be assigned as we better understand the analysis needs of the project.
• The Alignment tasks will be staffed by Joe Paradiso and Len Wilk both of whom have significant experience in high energy physics, Muon chamber design and alignment.
• Muon system integration will now be managed by Frank Nimblett. This should be an expansion of what he has been doing all along.
• Upgrading on muon system cost estimate will continue to be managed by Todd Hamilton through early April.
RRA,LQ~
• Information Needed to Complete Tasks: • Completion of Draper near term responsibilities, 2/18/92,
require that muon subgroup engineers supply size, weight and channel count data to Draper by 2/7/92 II
• Detailed information on deformation characteristics of the magnet for normal "g" loading, the effects of the vacuum in the cryostat as well as the effects of atmospheric pressure on this structure is necessary to understand our system mounting point stability. Alternative is that we will have to absorb this responsibility at the expense of some other aspect of the muon program!
• It is mandatory that subgroup cost estimates improve in both quality and content and be submitted on the standard forms distributed at the last muon meeting I In addition, review and feedback by the subgroups of the existing cost estimates, which were also distributed at the last muon meeting, is a vital link in completing this task.
QRA,LQ[i)
GEM Muon System
Boston Review 6FEB92
Support Structure
Layout
P.Ral!BB 555 Technology Square Cambridge, MA 02139
Michael DePiero (617) 258-2775
I~
OUTLINE
• DEFINE BARREL REGION MODULE ENVELOPE
- Clearance for Central Detector and its support structure - (16) symmetric Barrel Region Modules
- Pressurized Drift Tubes (PDT 8/8/4) options
• BARREL REGION MODULE SUPPORT HANGERS
- Vacuum vessel interface
- Directional stiffness to be determined by FEA Model
• FIXED RAIL SYSTEM OVERVIEW
- Welded support pads required to support rails - Carriage/Frame Assembly w/Roundway Bearings
- "A" Frame for central support of modules during installation
• FUTURE WORK
=-=-=---=--======-==-==-==-=======-===--==-lIBA~R~
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POT C 8/8/4 l SHOWN
'-
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CHAMBER TANGENT TO TRUSS
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SUPPORT HANGER TYP
CENTRAL DETECTOR 8.0m DIA X 12.0m LG
WELDED SUPPORT PADS
PDT C 8/8/"\ l SHOWN
BARREL REGION MODULE
50.Smm RADIAL CLR
IT w
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FUTURE WORK
• FURTHER ASSESSMENT OF BARREL REGION MODULE
SUPPORT HANGERS
• CONSIDERATION OF OTHER SCHEMES FOR INSTALLATION
OF BARREL REGION MODULES
• ENDCAP MODULE LAYOUT AND INTERFACES
• INTEGRATION OF MODULE TO MODULE TIE PLATES AND
KINEMATIC ELEMENTS
• ESTABLISH FEASIBLE PARAMETRIC RELATIONSHIPS
IN PROCESS
-=======--=-------====-==--===---=====-=---=-QBA~R~
( G.E.M.) 06 Feb. 1992
ANAL VSIS OF SUPPORT
STRUCTURE & INTERFACE
TO MAGNET
8. ANTKOWIAK
R. SAPIENZA
R. Sapienza flm~ _c,
ELEMENT MODELS I G.E.M. J 06 Feb. 1992
• Single Module Model
• Center Line 1-G Loading
• Transverse 1-G Loading
• Symmetric 360° Model
• Made of 16 Single Modules
• Each Tied to the Next at Seven Locations
• Supported by "Spring" Hangers
• 1-G Loading
A. Sapienza DRAPEH'f®' I APOPAl"ORY ~rf/
MODEL AND ASSUMPTIONS [ G.E.M. j 06 Feb. 1992
• Module Model
• 146 Structural Elements, 3.0" O.D., 2.5" l.D. Al Tubes
• 9 Chamber Elements
• 46 Nodes
• Assumptions
• Cryostat Modeled as Rigid
• Nodes (Joints) Restricted in Rotational D-0-F
• Hangers Modeled as Springs
• 20:1 Tangential to Radial, 2:1 Axial to Radial
• Links Tying Single Modules Rigid
• Chambers Modeled as Low Stiffness Plates
R. Sapienza nm~ I
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MODEL DEFLECTIONS [ G.E.M. ) 06 Feb. 1992
• Single Module
• Center Line 1-G Load
• Maximum Deflection of 0.17" at Node #29
• Transverse 1-G Load
• Maximum Deflection of 0.34" at Node #210
• 360° Symmetric Model
• Maximum Deflection of 0.33"
• Elastic Stability Load Factor 4-G's
• Total Weight 348,000 lbs.
R. Sapienza DRAPER~ LABOAAJ'ORY ~?/
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DEFORMED 9 O' CLOCK MODULE I G.E.M. j 06 Feb. 1992
h SSC MUON DETECTOR GEM SUPPORT
1 G GRAVITY LOAD
R. Sapienza OHAPIH'i' LABORATORY ~!fl
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FULL SYMMETRIC DEFORMED MODEL [ G.E.M.} 06 Feb. 1992
SSC MUON DETECTOR CEM SUPPORT
1 C GRAVITY LOAD
R. Sapienza QBa!!JB~
•
ISSUES & CONCERNS ( G.E.M. j 06 Feb. 1992
• Undefined Boundary Conditions
• Cryostat Assumed Rigid
• Ideal Geometry Assumed in Elastic Stability Analysis
• Detailed Model of Joints and Hangers Required
• Thermal Effects Not Considered
• Maintain Model with Current Design Iterations
R. Sapienza DHAPfH~ 1.ABOAATOR~ E~
G. E. M. MUON SYSTEM
CHAMBER I STRUCTURE
LAYOUT STATUS
Anthony Kondoleon
6 February 1992
QU!QB I .f'
G. E. M. BARREL REGION
Goals of Design:
Develop a Structure To Support Chambers Which:
Are as equal in design as possible
- Layer to layer
- Within the layer
Structurally Stable
Have equal centerlines spacings between layers
Have minimum dead spaces within layers
Have maximum viewing angle
A. Kondoleon DHAPf H~ 2/5192 ~--;ill"
G. E. M. BARREL REGION
PDT Chamber Layout (Cont.)
Space Between Segments
Clearance to Calorimeter Calorimeter O.D.
Clearance to Magnet Magnetl.D.
Center Line Spacing
4.0 in.
2.0 in. 315 in.
2.0 in. 653.5 in.
75.5 in.
(101.5 mm)
(50.8mm) (8.0·meters)
(50.8 mm) (16.6)
(1917.7mm)
~ Kondoleon DRAPIR(i 2/5/92 ._._ai:i7
G. E. M. BARREL REGION
PDT Chamber Layout (Cont.) Tubes 1.5 in Dia (38MM) Max Chamber Length157.5 in. PDT Chamber Size
Length Central End to End
Height 8 Layers Overall Inside 4 Layers Overall Inside
Internal Offsets Top&Bottom Sides Ends
(4.0 meters)
140 in. 144 in.
11.9 in. 9.9 in.
7.1 in. 5.1 in.
1.0 in. 1.0 in. 4.0 in.
(3556mm) (3657.5mm)
(302.25 mm) (251.45 mm)
(180.35 mm) (129.55 mm)
(25.4mm) (25.4mm) (101.5 mm)
A. Kondoleon DHAPIHB 2/5/92 ~
G. E. M. BARREL REGION
PDT Chamber Layout (Cont.) Full Resolution View Angles
30.39 to 85.1 Degrees Set by Layer 1 (inner)
Reduced Resolution View Angles 28.50 to 87.34 Degrees
Chamber Units Layer1 Layer 2 Layer 3
Chamber Weights Layer 1 8 Layers Layer 2 8 Layers Layer 3 4 Layers Total Per Section
2 Units 3 Units 4 Units
1736.0 lbs. 2579.5 lbs. 1697.5 lbs. 18000 lbs.
(789 Kilos) (1172.5 Kilos) (771.5 Kilos) (8182.Kilos)
A. Kondoleon DHAPIHB 2/5192 LAllCllUll'Clll
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PDT Chamber Layout (cont.) View Angles 8, 8, 4 Layers
VIEW LAYERl
(%) (Deg.) 0 0 0 28.91 100 30.39 100 45.11 0 46.83 0 47.91 100 49.60 100 84.80 0 85.10 0 90.00
LAYER2 LAYER3
(Deg.) (Deg.)
0 0 28.50 28.49 29.49 28.88 37.95 35.11 39.08 35.55 39.09 35.85 40.23 36.29 55.85 46.06 56.97 46.52 58.15 47.22
A. Kondoleon DHAPIHri 2/51'92 LAllCJIUll'ORYmiilV
G. E. M. BARREL REGION
DT Chamber Layout (cont.) View Angles 8, 8, 4 Layers (cont.)
VIEW LAYERl
(%) (Deg.) 100 100 0 0 100 100 0 0
LAYER2 LAYER3
(Deg.) (Deg.) 59.19 47.68 86.36 63.20 86.51 63.57 90.00 64.97
65.33 87.34 87.38 90.00
A. Kondoleon DHAPIH~ 2/5/92 ...__..,:ii"
200 190 -1BO -170 -160 -
~ 150 -
z 140
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0:: 120 -Ir. 0 110 -I- 100 z -w
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~~ E~
G. E. M. BARREL REGION
Truss/Chamber Designs Main Support Elements for Truss
3 inch dia .. 25 wall tubing Cross Elements of Truss
2 x 5 inch box AL . 125 wall Chamber
Wall 1.0 inch Flange length 2.0 inch
Joint (Truss) Tubing Element Clevis Design
.50 dia. pins 2.0 inches apart
.75 dia. bolt Box Elements Welded Internal
A. Kondoleon DHAPEHB 2/5/92 ....__
G. E. M. BARREL REGION
Truss/Chamber Designs (cont.)
Joint (tubing) Tubing cut to length
ID machined to accept end plug
Machined end plug to form clevis Machined end plug welded to tube
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-·---1
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-----·------·-----------
G. E. M. BARREL REGION
PDT Chamber Layout (Cont.) Attachment/ Assembly Options 1. Lower elements of truss assembled first
Layer #1 facing up. 2. Layer #1 Chambers (2) mounted to truss frame
Rigid mount design. 3. Truss assembly rotated 180 degrees. 4. Layer #2 Chambers (3) mounted to truss frame
Compliant/controlled mount design Layer 2 aligned to Layer 1
5. Upper level of truss assembled 6. Layer #3 Chambers (4) mounted
Rigid/compliant mount design Layer 3 aligned to Layers 1 & 2
7. Truss assembly rotated into assigned position.
8. Chamber alignments checked, measured & altered if necessary DHAPIH~ A. Kondoleon ~ 215/92 LAllDllAll'ORY
G. E. M. BARREL REGION
Near Term Plans PDT Chamber Layout
Concentrate on joint designs Truss elements Chamber to elements Internal Chamber components
LSDT Chamber Layout Develop Chamber to Chamber interface Develop structure to Chamber interface Follow same path as PDT work
Both Chamber Designs Modify and improve cost model and estimates
· A. Kondoleon DHAPIH. 2/5/92 ...__ :ii"
Optical Alignment at Draper Lab
* I_ I • Straightness Monitors
- Design - GEM Implementation - Current Research
• Global Alignment & Other Techniques -- {optical snakes, alignment xfer)
2/6/92 J. Paradiso
RRAPJJD 1-6"
Straightness Monitors Lens
~........_dx dy
• Measure 2-axis deviation (.l Optical axis) from straight line.
• Displacement of lens produces 2x (lens @ center) more image offset than movement of LED or quad diode.
• Rotation of lens, lens defects produce limited effect.
• LED defocused at diode (illumination sharing between quadrants).
• Sensitive (under few microns over 9m).
• Few components, inexpensive.
• Modulation of source reduces background
P.RAPlQ~
Straightness Monitor Electronics
LED Source
Collimation/Smoothing
1 Khz JUUl_
X=tA+IJ-@+Q ) A+B+c+D
y = tA+Bt- tc+Il A+B+c+D
Lens Quad Cell
0 (IR Filter)
Pre-amps
{optional)
1 Khz Bandpass Filter
Gate on high & Low Sampler, ADC
Average
Subtract High from Low Samples
Reject Background Light
RRAPlQB
Gem Hexant Alignment Schemes
I -- - --,~ -----,--- --- -- ,·
I I I ' , I I I , I I I ,
t I I ' ,
\ I PDT Packages
or LSDT chambers & wire supports
------- ="Straightness Monitors" (measure within 25 µm)
• Multipoint schemes to pass alignment across common lines
• Redundant alignment paths allow error isolation/compensation
P.RAPtQe
·straightness Monitors; L3 vs. GEM
• L3 tests indicated position resolution of 0.1 µm over 2 meter length
- Long-term shifts of 1.5 µm noted (electrical, mechanical drift?)
• Should easily meet GEM demand of 25 µm resolution over 6 meters
• Lens diameters under 1 cm
Wire planes or package boundaries
• Straightness Monitors affixed to chamber frames
- Lens moves w. wire plane [LSDT] or wire ends [PDT] ...
• Multipoint alignment schemes?
PRAPlQD
Current Straight~ess Research
• The Source •.•
- LED's can exhibit spatial inhomogeneity in light output.
,.. New Motorola LED under investigation w. smooth aperture function.
- Stronger sources for better S/N over longer paths?
• Laser diodes have spatial jitter; need collimation, smoothing ...
•The Receiver, the lens, & mounting mechanics
- Tests ongoing for spatial symmetry of quad diode response.
- Development/testing of precision mechanics needed to mount source, lens, receiver (alignment of optical axes).
P.RAPlH.~
Global Alignment
PDT Packages or LSDT chambers & wire supports
"Stress-free" Gossamer Reference Structure
• Most probable to sight a reference through endplate.
• Other schemes
- Align to thin-yet-immobile reference structure?
- "Flexible" optical snake across elements lacking open path?
RRAPtQ~
Solder
Readout Board
Wire
Epoxy Wire Bond and Gas Seal · Precision
F rrule Capture Tube--~.~~~._,_
.r
PDT
Gas Channel
i a _Contact • Spring
' Magnetic Impulse Crimp
.!ftr~
Epoxy seal
0
....... ... ... I I I ' I I I I I I I I
·~· ~~~·.-...i..-----1---1-...:.
: ~o I I I I
•, " , ...
Alignment pins, epoxied into plates
I I ., -! ·~JI
Gas Inlet/outlet, 3/8" pipe
ITEM I PART NO. I DESCRIPTION
PARTS LIST UNLESS SPECIFIED: OR 1 G. R. Miller DECIMALS :1:.005
DRAWN FRACTNS :t
I QTY.
11-31-92 I
ANGLES :t 1.0 0 •RoJEcT Gem Muon PDT -nr
BREAK ALL EDGES MATERIAL Alum. jig plate
DO NOT SCALE DWG
MICHIGAN STATE UNIVERSITY HIGH ENERGY PHYSICS
TITLE Manifold Plate Assembly OWG. NO. HEPOl-022-274 )REY, rc•'i.:2
• •
---
; .
Philosophy ·.
Wires placed to ::1:12.5µm. with respect to sur-vey points,
,
1) indenpendent of gravity 2) " temperature · 3) ". warp a.nd sag of the chamber. :.. ..,_
,,. .
Survey points known to ±12.Sµm., 1 )by surveying , 2)by placement (11nlikely) 3)by monitoring .
. '-· •. ... .. .....
}
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Resistive Plate Cl1ambers for the GEM Detector:
Engineering Design Concept
M~ ~
Irwin A. Pless and Craig R. Wuest
co-spokesn1en for the GEM RPC R&D collaboration
Massacl1usserts Institute of Technology Lawrence Livermore National Laboratory
January 31, 1992
•
RPC Summary:
Chamber size: length 360 cm widths 159, 239, 310 cm
Number of chambers: L 1 64 L2 96 L3 128
Total surface area: 2621 m2
Half-sector weights (kg): L 1 41 O L2 895 L3 1526
Total weight (tons): sector 5.66 barrel 90.6
Channel count (Loi): nonbend 21 k bend 18 k
·: .:·; .. •.:.~:·:" ~· . .-~·· .. ~--~; ~·::~ ·/·.":.·:·:·/·.~:.~ ~:":-".:;.~: .•. ~.: ;.:~:~.:~·."·;~:~:.::.-:·~·:-.. / .. · .. : -::·:-::.-~-;~·-..::·/· ... :·.~ "..·~·.\.: .\; .
..-.:·! ~ :-:;. -.::.~.:~~~)_·.:. ... >·.~ :~ •/:._;;;.~.:: .. ·:~ :· ~ ·.:; .... : .. ~:.~ •/:-~i.~>· ... ::·:·:":.:~·.:· .. :....>).:~ .. -.: ... ·:·: ... ~.:·T:-~~.:-~· ... ~
Densities: Bakelite and all materials except Honeycomb= 1 .5 g/cm-3 Honeycomb= 2.6 x 10··.3 psi (4.5 lb/lt .. 3 plus two o.or Al skins)
Areal Mass of two layer RPC = 2 x (2.6 x 10 .. ·3) + 1.6 cm x (1.5 g/cm··3) x 2.205 lb/1000 g • (2.54 cm) .. 2/1in .. 2
= 5.2 x 10""·3 psi+ 3.41 x 10··-2 psi= 3J!3 ):' 1 o··-2 psi
For four 350 cm x 31 O cm outer sector chambers:
4 x (360 cm x 310 cm) x 1 in""2/(2.54 cm)-2 x 3.93 x 10--2 psi= 2719 lb
Aluminum I-channel iramework: I-channel @ 2 cm H x 5 c.m W with 0.4 cm thick ribs, 4.48 cm*"2 cross section
4 x ((360 cm x 2) + (31 o cm x 2)) = 5360 cm perimeter
5360 cm x 4.48 cm··2 x 2.7 g/cm··3 x 2205 lb/1 ooo g = i 43 lb
Outer RPC box layout - 4 chambers overlap per sector x 16 sectors x 2 halves = 128 chambers
- 29. 7 cm overlap
29.7cm~ typ. ~
t . . . .
. . . •
. .
• . •
• .
• .
• : . • 310 cm . .
I . . . . . •
'
. •
. •
. :
• • . • .
. • : • . . •
• •
• • .
~ 360cm ~ ~ 360cm ~ + c============:r=======;:::::::::::========:r==========·--3cm 1~ 36Dcm ~ ~ 360cm ~ T typ.
...._ 1351 cm ~I ·.
10 cm
+ r~ I~
••••••
••••••
1351 cm ~
~;r:~.:_-:;ca.,-:=::::~1!1!.~:;;~;~E;;:~.::; ~.;.~!.:!~i:.~fta~~::~~~··'=E:,!:a..~:!:::: 'fil~~~f:§~~~i~~~;~~;~i;~~~·
:~.::::-!-.;.n.::.:;;~:;~-r.~=;.i1.i;·~~-~~iiii:J~~-· ·--.. -... -~....... . ....... -.. ...,::~~· -... ~.:'.;?.°':":"'"'~--::-:~!;-:::.'::!~!: ••. ' ·-.• ::·:-~~- .... t"z_ •. i:' •
Camon frame weight calculation: assume all suppons are 4 mm tllick. density = 1 .6 g/cm""3, U channel 2.5 cm W x 3 cm H, side members are 1 O cm wide (3cm RPC + 3 cm RPC • 3 cm U channel• 1 cm extramural space) Carbon frame weight: ·
2x(0.4x1351x10) + 2 x (0.4 x 310 x 10) + 20 x (0.4 x 310x3)+10 x (0.4 x 310 x 2.5) + 22x(0.4x412x3)+11 x(0.4x412x2.5)
= 3.92x10-4 cm··3 x 1.6 g/cm-3 x 2.205 lb/1000 g = 139 lb
Outer Sector RPC Total Weiaht:
Four 360 cm x 31 O cm RPG chambers = 2719 Jb
Aluminum I-channel RPG perimeter frame = 143 lb ' .
Carbon composite support frame = 139 lb; ...
RG-174/U coaxial cable around chamber perimeter= 81 lb
TOTAL WEIGHT = 3082 lb x 0.10 for miscellaneous connectors, brackets, etc.
= 3390 lb
Status of Engineering and R&D for the GEM Cathode Strin Chambers
Scott Whitaker
Draper Lab 6 February 92
Chamber design concept
System Layout
Weights and Measures
R&D Status
Brookhaven National Laboratory Vinnie Polychronakos Boston University Oak Ridge National Laboratory St. Petersburg Nuclear Physics Institute
CATHODE STRIP CHAMBER-- Cell structure
plain cathode
t 2.50lmm--------------------------t wire plane
t 2.50imm
112 =) ............ '"' _---s.oo mm--..-!
.013 mm gap
.030 mm dia wires
• • • •
2.50mm
segmented cathode -- strips
Two-Intermediate-Strip design
Single floating strip design also under consideration. ..
,
V=O
• • V=2500V
~------------------------~v=O
'
CSC Module Thickness
•
l
Modules 1,3 8" = 20 cm
Module 2 24" = 61 cm
Thickness of middle modules is increased for lever arm for triggering
gas volumes for
====~ ~ f~~:;opo1tional
====='/ l" hexcel pressure equilibration gap
mylar
Plan View of a typical module
cathode strip readout
anode wire ieadout
\
\
2m
Im I
I \ I \ I \ I \ I
-+
... added spacer
(hexcel?)
20-30cm
24"
• •
CSC Layout (Axial field; magnet with pole piece at 15m)
r cm Tiling options:
Overlap in cl> and in z 800 better coverage
loss of lever arm more average XO
or
400
610
Double overlap:
supporu more difficult alignment problems?
1045
27.5°
18°
-~----4---~ 9.4°
\ \ I \ \ I
~
1500 z cm
CSC Layout Specification Closed Magnet Geometry zmin=6.0m zmax=t5.0m
Nsectors= wires ganged by 20 = Slrip width at middle =
I nl Ill m deg
Inner modules
I) 6.3.5 2.50 9.39 2) 6.15 2.35 10.90 3) 6.IS 210 13.96
Middle modules
4) 10.70 2.50 9.39 5) 10.10 1.98 15.72
Outer modules
6) 14.85 2.50 9.39 7) 14.25 1.80 18.77
16 5.00 cm S.00 mm
n2 J!2 deg
2.35 10.90 2.IO 13.96 1.41 27.57
1.98 15.72 1.41 27.57
1.80 18.77 1.41 27.57
I ' i''~ ~ . S2 R2
II., Sl'dR /,.-,,... 1)1,111 R
r., 1 I I I . - ~ z
Nomenclature
Ill R2 l!R fil. S2 m m m m m
I.OS 1.22 0.17 0.41 0.48 1.18 1.53 0.35 0.46 0.60 1.53 3.21 I.68 0.60 1.25
1.77 3.01 1.24 0.69 1.18 2.84 5.27 2.43 I.I I 2.06
2.45 5.05 2.59 0.96 1.97 4.84 7.44 2.60 1.89 2.90
JSW 3 Feb92
Total channel cotu1ts: 41413 planes/module* Nsectors * 2 ends
ma l..&li:iJ!!I strip occ It r=<:hans I. strip ~bin l.tihan m•2 /pllw;:tr /sec /pl/sctr
0.08 89 104 3 11,346 442 0.18 106 94 7 13,549 884 1.53 185 69 34 23,676 4,306
1.14 187 81 25 23,876 3,184 3.78 317 18 49 40,539 6,223
3.72 293 39 52 28,100 4,978 6.11 479 4 52 46,014 4,987
Total channels=> 187,100 25,005 Total for 4/4/4=> 211,804 28,326
Total It of modules=> 192
CSC Power. Weight. XO SW 5Feb92
typical module 2m (r) x Im (theta)
Power component watts ch/mod power/mod
strip ch 0.1 800 80 incl fast out for trigger theta ch 0.05 160 8 trigger 10 1 10
total power per module 98 watts
Weight - middle module (extra spacer) component Kg/m"2 m"2/mod Kg/mod ave XO
hex eel 1.80 12 21.60 0.0308 Hexcel HRH-10-1/4-2.0 circuit bds 2.03 24 48.72 0.0610 .047 in, rho= 1.7
copper 0.16 24 3.84 0.0123 1/2 ozlft"2 wires 0.03 0.0002 4 * 800 * 25 mu W
Al sides 6.50 0.0112 50cm*6m*l/32 in frames, closeouts 18.40 0.0230 GlO 2.5cm *1.5cm * 6m * 5
electronics 5.00 0.0063 wild guess
average XO/module 0.1448
total weight per module 104.06 Kg
R&D Status
Chamber concept Mechanical tests (BNL, BU) MC studies (Bo Yu) Test chambers (BU)
Gas studies -- C02/CF4 mixtures (SPNPI, BU) Drift velocities Lorentz angles
Electronics Amplex-based strip readout (BNL)
+ fast pickoff for triggering
Amplex -- next generation (BNL)
Anode readout (ORNL)
Prototype tests -Tests at SSCL of 4-chamber system in June
Mechanical design underway (BNL) Gas system, DAQ underway (BU)
System performance studies MC -- Geant (SUNY-SB, BU)
Cosmic Ray Spectrum 25% CF4 2900 V
50
20
10
oi......... ........ 0 2llD .. 111111 IDO
ri1t- CICl-..t•
Fe-55 Spectrum 25% CF4 2900 V
200
100
0 0 200 400 800 900 1000
qVl Cbalmel
~ °1EST C 414Mleft ! Sro? Ttt~6 1)L~TICt8 ~\O tJ
ao ....... -.-.-.-........ ......., ................ ....,..., ....... ..,.........,... ..........
50
30
20
(cs~ -=~c..) 10
~i ~·so~ . 50 100 150 20Q
stop 'nzr. .....
Time Distribution 253 CF4 2900 V 200 ................ .....-..-........ .....-........................................ ........
150
100
50
50 . 100 150 200 St.op Time ns
80
70
j (j()
~ a so a
f: ~ "'Cl 20
10
0
:t I .
• a "'Cl
JI 6 .. I i 4 IS -2
0 0
0
0.1
• e-o a S-.4T
• B=.IT
Ii
soo
Drift Velacity n E field for sewaal B fields
1S" CF4 I 2S" C02
Iii
1000 lSOO 2000 Electricfield Vian
Lcaam An&le ft B field. E • 2000 Vian
75" CF4 / 2S" C02
o.2 o.3 0.4 o.s 0.6 0. 7 o.a B field Tt$1a
3000 3SOO
1
50'1. CF4 / 50% C02
E fteld V/cm 1000 2000 3000 3500
60.00
50.00 >-j: 40.00· -s • - 30.00. "'E !: E 20.00 · .. Cl 10.00
0.00
6.50
6.40 • a• 6.3o ii .a ;;. s.20 i .g 6.10.
! 6.00
0
B field Drift val Theta L Telsa mm/jl.Sec degrees
0.8 13.91 5.92 0.8 21.0G I.DI 0.8 43.13 S.26 0.8 51.36 ... ~
Drift velocity vs E tWd
50% CF4 / 50% C02
• •
• •
1000 2DD'O 3000 4000
E._. ('I/cm)
Lorentz.,._ vs E ftltd
50% CF4 / 50% C02
• •
• .. 5.90 ----'--------------
0 1000 2000 3000 4000
E field (V/cm)
ALIGNMENT TRANSFER BY INTEGRATED STRAIN
(AXIS)
Leonard S. Wilk
The Charles Stark Draper Laboratory, Inc. Cambridge, Massachusetts 02139-3563
I\
REV.1
RBll!lQ~
-· . ---~ r-:: .. ,--- ·~ - -- . ---- - . ·---- ·---... ...
SHAPE DETERMINATION WITH INTEGRATING STRAIN SENSORS
FllER
P • sensor welghllng (uniform)
b(x) • half diameter
0 w•(x) • rod curvature
x •distance •long rod · •
'{ / I I I l ...
OUTPUT OF INTEGRATING STRAIN SENSOR WITH WEIGtmNGS FUNCTION p(x)
...... """· 1
-AL• e • iLPb(x)~(x)dx
L L JL • P b(x)•<Xll. -P b'(x)w(x)I. +
0 P b"(x)W(x)dx
lfb(x) • B
e • P B(w'(4·W'(o)) • P B(8L ·80 ) (ANGLE OUl'PUl)
If b(x) • K ~ • x/l)
S • ·K Pw'(o) + K P/l.IW(l) -w(o))
• -K P(80 - DIL) (DISPLACEMENT OUTPUT)
r
L '
l I•
t
h: w 0 z 0 0 CJ) ->< <(
0 -h: 0 a: w m -LL.
• i
~Q =Q ~Q
•
I .....
.-1 <I- ~
l~.1 \ I t I I O') \ ,. ' _J \I t I . .,
I .. • I •
c ct) .2 ';( 'ti < ..
I :I CD C> CD -.. -.c c .... 8
.. ~ E 0 .. () CD -'t: 'ti Se .5 a> ct) .c - () >C Cl)
~ CD -C) c -Cl)
_. ..... r- ~··--·- _.,,,~ --
PICKOFF AND PROCESSING
• ,A BEFORE I A
OOUHT
01(~ l'lllERING, -
lOOIC
DUAi. I I I'.... I I GAit I toM:r.w1www • I ·(I BE!_ORE A
DETECTOR • •
'A.~ I • • -
SQD Readout Electronic Block Diagram
11wm-10 P.RA,lQ~
(fl
CJ) er: I = • w m - • .. .. LL. .... <
• Ill • i
Ill
i : : • (.) ~ ~ -b: i i
0 .. ::c ..... -~ I
m CJ) w -....
:Ii
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>
Ill Z5
; Id I
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Q
~ I ..
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• .. • • .. .. -· C3 i •
---·- ~--- r-:
REG. P.S.
~--- ·~
110F'32·11
Rev.1
RESISTIVE AXIS CONCEPT
REG. I ( P.S.
-
a - . .1L = .1l/L a .1R/R - D D/L D/L
ooa&R/R D/L
oR/R 10·6 10·1
L 6m 6m D 2cm 2cm &a 0.30 mrad 0.03 mrad
... -. '
9 ANGLE
CORRECTION
P.BAP.lQ~
~
(J) w I cc -;: " =
'=' I
• -I w >
"' -"' "' •
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m
w I i
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-> -I- I -(J) z w rn I -Q w
z
~ i ...I
a:: • ::::>
0 ::! .... • tll ~ : ~ •
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r
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i
r
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TASK
TEST1 F@743mm
TEST2 F@508mm
TEST3 F@495mm +FULCRUM
TEST4 F@235mm +FULCRUM
TESTS
THERMAL
t1118f332·22 Rev.1
TEST CONFIGURATIONS
•
CONFIGURATION BENDING MODE
sc••e FACTOR
1.254 al'Cl8Clfrlnge
1.235 arcsec/frlng1
1.131 al'Cl8Clfrlng1
1.116 arcsec/trtnge
DM.P.lQri>
2500
2000
I !!I I 1soo
I 1000
0
RESISTIVE AXIS TEST RESULTS
0 1
SENSITIVITY 1.46 mV/mrad
BRIDGE VOLTAGE30V
2 I 4 I I 7 I t 10
BRIDGE OUTPUT (mY)
Quad- Cell Lens
,·
Corner Cube {optional)
--~--------
Rigid Tube
·--'!3~--P.S~-~-------P1 P2 P4 PS
Fig. IV .23. Multipoint (P1 ... Pe) alignment system, tchematic.
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