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Forward scintillators in ATLAS: cryostat and MBTS
CERNDubna
Michigan State UniversityUniversity of Texas-Arlington
presented by J. Huston
Michigan State University(apologies: some useful drawings captive on laptop, in for repairs)
D4D5 D6
B11 B12 B13 B14
A12 A13 A14 A15 A16
B15
E1,2
E3,4
E3 C10 B11 E1 D5 A14 - A15 B14 D6 A16 - -
D4 A12 A13 B12 - B13 - - - - B15 -
1.0 1.1
1.2
1.4
1.6
ITC Scintillators
(cryostat (or crack) scintillators)
(gapscintillators)
Crack Scintillator (E3, E4)
ATLAS IC Scintillator
R. Miller
Dimensions are in mm with a tolerance of ± 0.1 unless stated otherwise. Dimensions in parentheses are in Inches
DRAWNDATEPROJECTMATERIALTITLEDWG. NOSCALE
NOTES:
1.
MICHIGAN STATE UNIVERSITY HIGH ENERGY PHYSICS
REV
ASSEMBLY
A
HEP-B-025-368
227
140
885
Mounting bracket
Outer End piece Optical connectorsockets (2) pinned and sealed into end piece
Bottom cover panel is epoxied to end pieces.Black felt light seals line the surfaces in contact with fibers or scintillator edges.Top cover panel overlaps the bottom cover and end pieces and is taped at the edges.
Compression plate with set screws in same holes as mounting screws
6 mm thickPVT Scintillator, wrapped in Tyvek
OpticalIsolators on edges as necessary
(6) WLS Fibersfor cell E3
Inner End piece
Cell E3478
Cell E4362
19 8-14-01
1:5
C(1/8 x 3/4) pin
E4E3
(6) WLS Fibersfor cell E4
Mounting Proposal
ATLAS ITC Scintillator
R. Miller
MICHIGAN STATE UNIVERSITY HIGH ENERGY PHYSICS
REVDRAWNDATEPROJECTMATERIALTITLEDWG. NOSCALE
HEP-B-025-
227
DR = 885
140
Z=3560
Z=3540
R=1453
GAPSCINTILATOR
INTER-CRYOSTAT SCINTILLATOR MOUNTING
137.
117.
R-PHI VIEW R-Z VIEW
Pin aligns inner end to slot in next ctr.
9-21-01 E
MOUNTING
1:5
Dimensions assume 2 mm between Ctrs.
Cell E4362
Cell E3478
371
E4E3
8*
15*
25
13
20
R=2313
MOUNTING DETAIL
50
10
(2) M4 x 15Socket Hd. CS attaches crack ctr. to bracket
(2 ) M8 x 30Flat Hd. CS Ctrsunk attaches bracket and gap ctr. to EB end plate
Shim as neededto clear LAr Cryost.
eta=1.20
Bracket
R=2288
R=2260
CRACKSCINTILLATOR
* Indicates Envelope DimensionNOTES:
Bar is Integral to crack ctr.
Bar is Integral to gap ctr.
LAR CRYOSTAT
TILECAL EB
View of 2 cryostat shells
mounting bracket
Closeup
Bracket in final position
Bracket in final position
ATLAS ITC Scintillator
R. Miller
MICHIGAN STATE UNIVERSITY HIGH ENERGY PHYSICS
REVDRAWNDATEPROJECTMATERIALTITLEDWG. NOSCALE
HEP-B-025-
227
DR = 885
140
Z=3560
Z=3540
R=1453
GAPSCINTILATOR
INTER-CRYOSTAT SCINTILLATOR MOUNTING
137.
117.
R-PHI VIEW R-Z VIEW
Pin aligns inner end to slot in next ctr.
9-21-01 E
MOUNTING
1:5
Dimensions assume 2 mm between Ctrs.
Cell E4362
Cell E3478
371
E4E3
8*
15*
25
13
20
R=2313
MOUNTING DETAIL
50
10
(2) M4 x 15Socket Hd. CS attaches crack ctr. to bracket
(2 ) M8 x 30Flat Hd. CS Ctrsunk attaches bracket and gap ctr. to EB end plate
Shim as neededto clear LAr Cryost.
eta=1.20
Bracket
R=2288
R=2260
CRACKSCINTILLATOR
* Indicates Envelope DimensionNOTES:
Bar is Integral to crack ctr.
Bar is Integral to gap ctr.
LAR CRYOSTAT
TILECAL EB
Special ITC brackets
Inner radius
Counters held together by pins in one module fitting into slots in neighbor module
Cryostat scintillator status as of 2004
Optics, PMT’s, electronics and even mechanical shells were available
Scintillator purchase was a victim of management contingency and the cryostat scintillators were on the upgrade path
In the last few months, thanks to Marzio and Howard Gordon, the money is now available for construction and installation
Scintillator has been shipped from CERN to MSU yesterday
~2.5 month delay Construction will still be
complete during summer
…and,to save money, we will use polystyrenescintillator provided by Dubna, rather thanthe PVT scintillator from Bicron;factor of 2 less light yield, i.e. more like 2-3 pe/mip calibration issues
Same WLS fibers as for gap scintillators
MBTS counters
2 segments in ; inner segment covers pixel detectors
Readout Scintillator is polystyrene-
based, 2 cm thick Readout is by WLS fibers
running along division between L/R scintillator segments plus through sigma grooves in scintillator
Struggle to be able to trigger on MIP’s
increase light yield using every trick we know
Will also crank up HV to 900 V WLS fibers welded to clear
fibers to produce a pigtail which will mate into 1/8 of cryostat scintillator optical connections
after commissioning cryostat detectors will be re-connected
Scintillator
Scintillator has been produced by Dubna same scintillator as used for CDF central pre-radiator
upgrade currently at CERN, awaiting shipment to MSU later
this week ~2.5 month delay…
…construction will still be complete in September will continue to test counters using ATLAS
electronics readout chain at the U. of Chicago …and installation will take place this fall/winter
New decision
• MBTS scintillator and boronated polyethylene moderator will be mounted together in same can
MBTS counters are never removed; they just slowly die but continue to moderate
Moderator has to be machined back to 30 mm
currently looking for vendor envelope of MBTS + moderator is 57 mm
New drawings of moderator + MBTS
…still have to be approved
3547
3606
MBTS drawings
Installation work
This fall/winter, the gap and cryostat scintillators will be installed on EBA and EBC maybe delay in current schedule, but roughly Nov
and JanDuring these times, teams from the institutions
listed on front page will be at CERN and will also work on installation of MBTS counters + moderator working with shielding group all details not worked out yet, but Ron Richards is at
CERN for next few weeks to coordinate installation is designed to be relatively
straightforward