Transcript LAT Test Planning Meeting 9/12/05 (ppt)

GLAST LAT Project
4 April 2005
GLAST LAT System Engineering
Gamma-ray Large
Area Space
Telescope
LAT Test Planning Meeting
Performance and Ops Test Plan
Update
Alternate Integration Plans
Pat Hascall
SLAC
[email protected]
(650) 926-4266
LAT System Engineering
LAT Test Planning Meeting
GLAST LAT Project
4 April 2005
Performance and Operations Test Plan Updates


Incorporate LAT-CR-06815 to eliminate the clock margin
test.
Update Cal and Tracker test definitions
– Calorimeter test definitions – simplification of the descriptions
and discussion of parallelized scripts.
– Updated Tracker test definitions to discuss parallelized scripts.


Incorporate LAT-CR-07178 to define the ACD receiving
test.
Incorporated LAT-CR-06616. This CR updated Figure 5-1
to allow tower integration directly onto the grid. This update
includes further changes to Section 7 and Figure 5-1 to
allow either tower integration directly into the grid or tower
integration starting in the test bay.
LAT System Engineering
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LAT Test Planning Meeting
GLAST LAT Project
4 April 2005
Change details


LAT-CR-07178 was written to allow integration of the
towers directly onto the grid.
The update to the Performance and Ops Test Plan allows
both testing in the single bay and integration directly onto
the grid.
– Figure 5-1 updated to show the flow assuming integration in the
test bay, with a note to indicate that the single bay testing is
optional
– Section 7 was updated with a definition of the baseline
sequence and some allowable variations
– The test matrix (Table 7-1) was updated to collapse the
definition of a CPT into one set of columns, rather than three
sets (test bay, single tower in grid, multiple towers in grid)
LAT System Engineering
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LAT Test Planning Meeting
GLAST LAT Project
4 April 2005
Figure 5-1 update
TEM/TPS
Incoming
Receiving
Test
CAL
Incoming
Receiving
Test
TKR
Incoming
Receiving
Test
Single Bay LPT
or CPT, Trigger
timing
______________
Test Bay
Assembly Test
______________
Metrology Bay
Single Bay LPT
or CPT, external
EGSE
______________
Grid
LPT with only newly
integrated towers with
GASU
______________
Grid
Multibay LPT or
CPT, SVAC data
collection
______________
Grid
PDU
Incoming
Receiving
Test
GASU
Incoming
Receiving
Test
SIU
Incoming
Receiving
Test
EPU
Incoming
Receiving
Test
ACD
LAT System Engineering
Incoming
Receiving
Test
Integration Tests
______________
Grid
4
Process repeated 16 times,
once for each tower,
First tower has additional
SVAC and ETE tests in single
bay and grid
First two towers have CPT
The Single Bay testing is
optional - if it is not performed,
the Trigger Timing will be set
when the tower is in the Grid
Process repeated
8 times, once for
each pair of
towers
CPT,
Environmental
Tests (including
CPTs and LPTs),
CPT
LAT Test Planning Meeting
GLAST LAT Project
4 April 2005
Sequence Options

The baseline tower integration sequence is:
– Integrate the tower into the test bay, perform a CPT (first 2 towers)
or a LPT. Perform trigger timing tests.
– Integrate the tower into the grid, perform a CPT (first 2 towers) or a
LPT on the newly integrated tower. Note that typically two towers at a
time are integrated.
– Perform a CPT (at 2,4,8 and 16 towers) or LPT with all the integrated
towers.
– Perform the SVAC calibration and muon runs with all the integrated
towers.

Variations to the baseline sequence are:
– The tower may be integrated directly into the grid. In this case, the
trigger tests will be performed in the grid. The test bay LPT/CPT will
be replaced by the LPT/CPT in the grid.
– More than two towers may be integrated at a time. In this case, a LPT
or CPT will be performed as each tower is integrated.
– Note that two tracker tests (TE702 and TE704) are Tracker level
tests that could not be performed earlier due to test set limitations.
These two tests should be performed as early as practical.
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LAT Test Planning Meeting
GLAST LAT Project
4 April 2005
Existing Test Sequence Summary

The existing test sequence to be performed with 16 towers
is:
–
–
–
–
–
TEM register tests
LAT CPT for Calorimeter and Tracker
TE702 and 704 to complete Tracker subsystem testing
Time in the new towers
Calibration runs (CalibDac, CalibGen, MuTrig, TE601, 602 and
604)
– SVAC runs
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LAT Test Planning Meeting
GLAST LAT Project
4 April 2005
Proposed Test Sequence Discussion

The proposed modifications to the planned tests are:
– Skip the register tests as they will have been performed during the
installation of the last 8 towers
– Run LAT CPT for Cal and Tracker
• About a day of testing
• Gives good confirmation that the towers are operating properly
• Given that the single bay LPTs were performed as part of the installation
process, could we skip this test here and do it after the ACD is installed?
– Run Tracker tests TE702 and 704 (necessary to complete testing of
the trackers, less than one shift)
– Time in the 8 new towers (Time duration needs to be worked – what can
be done in parallel?)
– Defer the calibration runs until the ACD is installed
– Defer the SVAC runs until the ACD is installed
• Perform a short TBD Muon run to demonstrate that the 16 towers are
working together (calibration for this muon run is TBD, since the Calorimeter
or Tracker would not have been calibrated with the flight TEM/TPS)
LAT System Engineering
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LAT Test Planning Meeting