LIQUID ARGON CALORIMETERS LAr Calorimetry: Status Summary

1
LIQUID ARGON CALORIMETERSLAr Calorimetry Status
Summary

• ATLAS Plenary Meeting 25-June-2004
• H. Oberlack
• MPI für Physik, Munich

2
CONTENT

• Cryostats Integration of Calorimeters
• Beam tests
• Electronics
• Installation Commissioning
• Conclusion

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M o d u l e P r o d u c t i o n C o m p l e t e
!!! A l l W h e e l s A s s e m b l e d !!!
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Barrel Cryostat

• Both wheels inserted.
• Final welding of cold vessel successfully
  completed.
• Solenoid integration finished.
• Decided on slower cool-down to safe-guard e.m.
  detectors
• Gas N2 instead of liquid N2 through heat
  exchanger.
• Cool-down started end April, completed beginning
  June.
• Argon transfer to the cryostat started Tuesday,
  8-June,
• completed three days later.
• Purity of LAr in the cryostat 0.15 ppm O2
  equivalent

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Cool-down Barrel Cryostat
4.5 K/day
6
First Look at HV after Filling
Presampler
Calorimeter
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Commissioning Tests of Barrel
AA wheel CC wheel Tests -TPA -LC -RRcalib -R
EFreflectometry
w31
w30
w29
w28
July
HV AC
HV on C (18 days)
HV on A
TPA on A
FEC on C
LC on A
RLC on C
w34
w33
w35
w32
August
HV on A (20 days)
TPA on C
R on A
REF on AC
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FORWARD CALORIMETERS

• FCAL-C
• Calibration run of complete FCAL-C completed
  2003.
• Modules inserted into cryostat can.
• Integration
• Insertion into cryostat end July-04.
• FCAL-A
• All three modules complete.
• Cold test successfully done Jan/Feb-04.
• Insertion into cryostat can in Sep-04..

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Integration of End-Cap C
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End-Cap Cryostats Trial FCAL Insertion

• Successful trial insertion and extraction
• Sag as expected
• FCAL-A can available for detector
  assembly/insertion

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END-CAP CRYOSTAT C

• ECPS, EMEC, HEC1 and HEC2 inserted and
  commissioned.
• FCAL to be inserted in July-04.
• Decided for slower cool-down to safe-guard e.m.
  detectors.
• Due to the larger mass of the EC calorimeters a
  different procedure has to be applied than in
  the barrel
• Blow He gas into the EC cryostat.
• Use H1 system.

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END-CAP CRYOSTAT A

• Large Omega seals and cold cover modified.
• Pressure test at 3.4 b mechanically successful.
• Large seals leaked at 2.6/2.8 b, when 2.7 b
  required.
• No leak of large seals at 2.7 b during cold test.
• Influx of heat into FCAL measured to be lt 10 W /
  m2
• (ltlt 80 W / m2, the critical value)

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Welding the End-Cap Cryostats

• The EC cryostats were not tight at 3 bar (working
  pressure 2.7.bar)
• We decided to weld the cold vessels of the
  cryostats shut.
• Start welding ECC July-04
• Start cool-down Sep-04

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Welding the End-Cap Cryostats
Welded frame

• Welding test probe
• Hydraulic pressure test
• 4 bar for 2 hours
• 10 bar, no visible deformation
• 37 bar leak opening, pin hole at a stop/start on
  the weld. No crack. Front band deformed.
• Accepted.

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Integration End-Cap A
ECA PS All modules installed. HV tested. All
o.k.
EMEC A wheel fully assembled. Wheel rotated. HV
checks done. Globally better than ECC.
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BEAM TEST ACTIVITIES

• Test beam runs of series modules
• EMB Finished in 2002. 4 / 32 modules tested.
  NIM
• EMEC Finished in 2002. 3 / 16 modules tested.
  NIM
• HEC Finished in 2001. 24 / 128 modules tested.
  NIM
• FCAL Beam calibration in June/Sep-03 3 / 6
  modules.
• Combined test beams
• EMEC / HEC Finished in Aug/Sep-2002. NIM
• EMEC / HEC / FCAL Data taking.
• EMB / Tilecal ATLAS Data taking.

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FRONT-END ELECTRONICS - 1 -

• DMILL
• SCA Production yield slightly higher than
  expected.
• Combined wafers for analog chips OK
• Combined wafers for digital chips OK
• DSM
• SCA controller and a few smaller chips produced.
• Being tested.
• Rad.tolerant prototypes of all boards exist.
• All FE electronics boards passed PRRs in
  March-04.
• Production started, still on schedule.

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FRONT-END ELECTRONICS - 2-

• LV PS
• 2 prototypes received, met specs.
• PRR successful mid Mar-04.
• Order passed
• First articles expected Nov/Dec-04
• Series delivery (4 / week) starting end Mar-05.
• Delivery dates are critical for installation on
  barrel in truck position.
• Negative voltage regulators
• Version six works and is rad.tolerant. Go ahead
  given.
• Series chips expected soon.

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FRONT-END ELECTRONICS - 3 -

• Complete test of full FE crate
• One half crate with all boards in test 14 FEBs,
  controller, calibration, tower builder,monitoring.
  
• Started in Oct-03, ended in Mar-04.
• Lots of test data (1 TB). Very active data
  analysis.
• Problems with event synchronization via optical
  links, traced to TTC system, modified FEB to
  include QPLL.
• Use FE electronics now in H8 beam test.
• Prepare to measure noise in barrel cryostat with
  FE electronics.

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OPTICAL READOUT LINKS

• System PRR successful
• Transmitter OTx
• Production started.
• PAR held, recommended small modification.
• New preseries of 100 pieces in production.
• Receiver ORx
• Production started.
• Preseries of 100 pieces in production.
• Optical cables
• Architecture of cable defined.
• To be ordered when length received from TCn.

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BACK-END ELECTRONICS

• ROD system
• Agreement with Tilecal for common ROD production.
• No hardware changes since a few months.
• Build entire system within CORE frame.
• System test of the back-end electronics (BE Crate
  test)
• Location LAr-EMF at Point1.
• Defined tasks and responsibles.
• BEC test delayed by several months due to delay
  of hardware.
• Serious problem to get online software going.
• BEC test in full operation now.
• Shifted ROD PRR to 25-June-04.

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CABLES SERVICES

• Trigger cables
• Arrived in LAr-EMF.
• One connector per cable.
• Company to put 2nd connector in USA15 after
  installation
• Progress on other cables / services is slow.
• Becoming critical, need to speed up and order.
• Logical error
• TCn asks LAr to provide cables for cable
  campaign.
• We need to order, but TCn cannot provide cable
  lengths.
• Order 25 more and accept extra cost???

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Installation Overview

• LAr system installation
• 3 Cryostats TCn (LAr)
• Cryogenics CC team
• Electronics Front-End LAr
• Electronics Back-End LAr
• Cables Services TCn (LAr )
• Installation system established and working
• Most baseline decisions taken
• First installation operations starting in
  July-04.

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Electronics Installation

• FE installation on cryostat front faces (Truck
  and IP positions)
• Most coordination and organisation needed due to
  strong interconnection of different boards and
  systems.
• Establish common installation team (FEIC).
• FE installation document agreed.
• Task lists established, time and manpower
  estimates agreed.
• BE installation in USA15
• Document similar to FE note close to completion.
• WP tables in advanced state
• Time and manpower estimates, assignment of
  responsibilities.
• Installation ASSO 12/13-July-04 together with
  Tilecal.

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Installation Time Line

• Mid-End July Water manifolds and supports in
  lower half tilecal
• End October Transport and lowering of LAr
  Barrel
• October TCn Installation of LAr cables from
  USA15 to cavern
• December Tilecal Barrel completed
• December Continue infrastructure including
  FE crates
• December January
• Prepare FE boards in EMF
• Prepare readout system for USA15 in EMF
• Prepare test needs in UX15 and USA15
• water, readout, temporary Truck-USA15
  cables, DCS
• February Lower a full set for one FE Crate
  incl. LVPS
• April (?) FEC 2 (when 1 is running
  more boards and LVPS available), ... FEC
  i1 ...
• End August Barrel moves to IP

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CONCLUSIONS

• Module production and wheel assembly completed.
• Barrel and ECC cryostats filled with wheels.
• Integration of calorimeter wheels in ECA is in
  full swing.
• Cold tests of barrel under way, cold test of ECC
  cryostat being prepared.
• Slower cooling procedures for barrel and end-cap
  detectors being implemented.
• Implications for ATLAS under investigation.
• Front-end electronics production started after
  successful PRR.
• Back-end electronics with slow start for BEC
  test. PRR this afternoon.
• Installation of calorimeter system into ATLAS
  preparing for Installation ASSO.