Hi,
I would first like to thank Kris and the other members of the
NIM paper committee for coming up with a very useful document.
I think we all appreciate the difficulty of this undertaking!
I also apologize for any redundancies my suggestions have with those
already posted on this list. I did not go through and
cull out the duplications. Also, I just noticed the end comments.
Some of my comments may be covered there... ...steve
Comments and suggestions:
INTRODUCTION
...change "a small experiment" to "a "small" experiment", since in this
context small if a very relative qualifier.
...change ", and subsequently ..." to ", and was subsequently...", for a
more
parallel construction.
...change "for the run in 2001" to "for the current 2001 run".
...change "and finally presents some performance results." to "and the
performance achieved for the different components.", for a more
parallel construction.
BRAHMS PHYSICS GOALS
...no suggested changes...
EXPERIMENTAL LAYOUT
Forward Spectrometer
...Is is possible to provide a reference for "septum design"? This seems
like jargon that might not be obvious to a non-magnet person (...like
me...).
Mid-Rapidity Spectrometer
...no suggested changes...
Global Detectors
...the pseudorapidity expression is not clear whether it is
tan(theta)/2 or tan(theta/2)
...bottom of page, the |eta|<2 should be |eta|<2.2 in order to be
consistent with later claims. This then changes the anglular range
to 12.6 deg to 167.4 deg.
..in the beam-beam counter discussion an accuracy of better than 2cm is
claimed. Later in the paper a ~1 cm accuracy is claimed. One consistent
value should be used.
BRAHMS SUBSYSTEMS
Magnets
...I have not been able to come up with a mental image of a bed stand
shaped coil. Would a schematic diagram be possible?
...Last full paragraph on page with Table 1, change "The mean field in
the gap in the vertical direction (y-direction) was 1.2T, and the
bending ...",
to "For a mean field in the gap in the vertical direction (y-direction) of
1.2 T, the bending..."
...beginning text on page with Fig. 5, change "...RHIC beam consistent..."
to "...RHIC beam, consistent ..." (add comma)
Spectrometer Detectors
Time Projection Chambers
...bottom of 1st column on page with figure 7, change "resistor chain that
degrades the bottom..." to "resistor chain that maintains the bottom..."
...Somewhere in this discussion it would be useful to have an explicit
statement that the counters are operated at ambient pressures.
...In Table 2 is is not obvious that the "distance to the vertex"
relates to the beginning of the active volume.
...Figure 8 caption, "anode" is mispelled.
...first partial paragraph under Fig 8 caption: The reference to
a "bottom proportional counter" is unclear.
Drift Chambers
...A schematic figure of the wire plane configuration would help.
...Again an explicit reference to operation at ambient pressure
would be useful.
Time of Flight Systems
...I thought Ian had some nice pictures that made very clear how the
slats and PMT's were organized. Could one of these be added to
clarify the geometry?
...Figure 12. Serious compression problem.
Cerenkov Detectors
...In the discussion of the RHIC detector, it would be nice to have an
explicit statement of the size of the focal plane. That is, what is
the net area covered by photomultipliers and what is the geometry (ie,
square, rectangular...)
Global Detectors
...Figure 17 reference should be Figure 4.
...first full paragraph on page without figures, change "are processed,
employing 11 bit FERA readout.." to "are processed, employing
LeCroy 3309 Peak-To-Charge signal shapers and subsequent 11 bit FERA
readout..."
Beam-Beam Counters
...The discussion for the T0 expression indicates that "average
times for a sample of" tubes is used. The prior discussion, however,
indicates the importance of using beta=1 particles. If you are
using an average of tubes and not the leading timing tubes, don't you
mix in slower particles? Am I missing something?
...change "better than 1.2 cm" to whatever is decided as the official
quotable resolution for these detectors (see earlier comment...)
ZDCs
...change "background events a feature..." to "background events, a
feature"
(add comma)
...Figure 22 caption, remove "big" since it is redundant
...last full paragraph on page with Fig. 22, change "average of the two
times might be" to "average of the two times can be"
...later in same paragraph, change "leads to a ZDC vertex resolution is
3.6"
to "leads to a ZDC vertex resolution of 3.6" (is to of)
TRIGGER AND DATA ACQUISITION
Trigger implementation
..change subsection heading to "Trigger Implementation"
..change "consists of 12 detector systems that compromise about" to
"consists of 12 detector systems with about"
..change "about 450 channels of PMT for which" to "about 450 channels
of PMT, for which" (add comma)
...change "The design and timing were also driven..." to "The design was
also driven..."
...I may have just missed it, but I can't find where FEE is expanded.
What does it stand for?
...change "come from two primary detector systems namely..." to
"come from two primary detector systems, namely" (add comma)
TPC readout
...Move the sentence that begins "The FEE cards.." to before "The START
FEE cards...". Otherwise the sentences seem scrambled in this paragraph.
...Table 6, LVL0 "output", to be consistent with other table entries.
Trigger Clock module
...no suggested changes
VME receiver module
...first paragraph, change "Each receiver board can accomodate the data from
one TPC. One receiver boear is dedicated to each TPC and is
interfaced..." to
"Each receiver board accomodates the data from one TPC and is interfaced..."
...note 1 at bottom of page, change "When operating at that speed though
the.."
to "When operating at that speed, though, the.." (add commas)
...task 2 discussion. I found this somewhat confusing. I would like to
suggest an alternative wording that I think is correct, but it may
be that something else was intended. In any case, for the
"Upon the completeion of event readout.." sentence, I suggest
"Upon the completion of the event readout the data that reside in the
4 SRAM data banks are pedestal subtracted and sorted, with data for
the same pad and corresponding to different time bins ordered in
consecutive memory locations."
...task 3 discussion, change "The FIFO is being emptied..." by "The
FIFO is emptied..."
...task 3 discussion, last sentence. "readout" should by styled open
as "read out" and there should be a comma after the "out"
Data Acquisition Overview
...Figure 24 has clipped wording. Unless there is a "ynchronization"
trigger.
Hardware
...no suggested changes...
Software
...no suggested changes...
Event Builder compoents (i/o-server)
...capitalize i/o
Event synchronization
...no suggested changes
Run Server
...Is it possible to expand on what is meant by a "state machine". This
terminology suggests hardware, but the discussion suggests software.
If this is just jargon for a software program, I would suggest placing
the initial occurence in quotations.
...fist line of page with "ONLINE MONITORING", change "data and if
necessary,"
to "data and, if necessary," (add comma)
Performance
...no suggested changes
ONLINE MONITORING
Monitoring Program
...no suggested changes
Tree Program
...no suggested changes
3D Monitoring of TPC's
...no suggested changes
SPECTROMETER PERFORMANCE
...no suggested changes
ACKNOWLEDGMENTS
...I notice that the funding agency acknowledgements is quite different
from our earlier two papers with, presumably, the same author list. In
any case, please add to the DOE list grant DE-FG03-96ER40981
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