Final Reading of CFT-09-025, v.13
Comments from Bob Brown, Gigi Rolandi, Luc Pape
New Version : v.15
Not accepted comments of Type A
November 5th,2009
Gigi: L10
> Also at this introductory level you could suppress the "In each
> chamber, the DTLT generates track segments from the alignment of hits
> and assigns the BX".
>
L45 ( line 43 v.15):
Bob: replace the first few sentences of this para with the updated
standard text
Not done ………is it really necessary ??
Gigi: delete 45-51 and place the TTC definition later in the text replacing
> TTC at line 61 with
> Trigger and Timing Control system (TTC)[4]
We prefer to keep
L53,54
Bob iron -> steel (two occurrences)
I think that ‘steel’ in correct…
L107 ( line 100 v.15) :
Bob: time of the tracks - tracks don't have a time.
taken for particles to travel
I suggest: time
we replaced in line 86 V.15 and everywhere
"track time", "track timing" etc...replaced
by "muon arrival time"
Gigi: > Figure 7: the legend (ALL) and the caption (WITHOUT) do not match. The
> text matches with the legend.
L180 ( line 174 v.15):
Bob:
allowing for a common displacement....this is an incorrect use of
"allowing for", but I am not sure what is intended
- possibly: allowing a common....position to be used.
“ Assuming a straight line trajectory, the algorithm optimizes the track direction and
position, allowing a common displacement of the hits from the wire position.”
Bob:
Figure 9 caption: replace full stop after "chamber" with a comma and
delete "From top to bottom"
I have no idea what the last sentence means. Possibly replace with: The
correspondence between chambers and sectors is indicated on the x-axis
of the top plot?
L205( line 200 v.15)
Gigi :> 205/215: vertically positioned sectors : the sectors that measure
> horizontal tracks
>
> 208 "horizontally positioned --> that measure almost vertical tracks
>
> 217 stray magnetic field AFFECTING TEH DRIFT VELOCITY (??? I am not
> sure)
Comments from Bob Accepted : in the vertical sectors
L213( line 209 v.15):
Bob:
reflects -> demonstrates
“Demonstrates” does not sound to mean what we want to say. Could it be to use
“is the result of “
L228 ( line 223 v.15):
Bob:
" Other detectors...as well."
There is RPC trigger …because
What does this sentence mean?
L267-270
Gigi
> 268-270 I am not sure that the statement is correct.... It is just
> because of the statistics of
> the horizontal muons.
>
It is not really a problem of statistics: it is due to the
systematic error which can be caused in these sectors by using the
computation of the mean values of the tTrig in the two r-phi SLs of the
chambers. The tracks in these sectors have a large angles and they can
be coming or from outside to the IP or viceversa. That make the rising
edge of the "timeboxes" of the two SLs very broad and the tTrig mean
values in the two SLs sometime not equal within ~ns suffering , in this
computation, also of poor statistics.
L274…( line 270 v.15):
Bob:
The final sentence ….Do you plan to combine the results from the two
mehods?
I expect results equal within ~1 ns .
***************************************************************
End of not accepted comments .
A.T. Meneguzzo
Bob Brown
Here are my Type A comments:
L16: -> ...and assigns the BX. (delete "it")
L22: ...depending on... -> requiring
L24: Cosmic muons -> Cosmic ray muons
(Here and everywhere else - needs a global search and edit)
L27: muons -> muon (singular)
L31: DTLTs (no apostrophe - here and everywhere else - needs a global
search and edit)
L34: cosmic data -> cosmic ray data (here and everywhere else - needs a
global edit)
L39: at any time -> at random times with respect to the clock
L42: at the LHC -> for normal LHC operation
L42: Delete the sentence: Section 3 is independent....what message is it
supposed to convey?
L45: replace the first few sentences of this para with the updated
standard text
Not done ………is it really necessary ??
L53,54 iron -> steel (two occurrences)
I think that ‘iron ‘ is correct word..
L54: beam line -> beam direction
L60: match the capitalization of Trigger and Timing control Receiver
with TTCrx
L70: add comma after MHz
L75 : -> quality (HH) is...(add brackets)
Figure 2: add CMS in the box
L100: left side plot -> left plot (here and elsewhere - needs global
edit - also for right side)
Figure 3 caption : -> defined by maximising the HH DTLT efficiency.
L107: time of the tracks - tracks don't have a time. I suggest: time
taken for particles to travel
"track time", "track timing" etc...replaced
by "muon arrival time" everywhere
L113: section heading - Cosmic ray muon (without quotes)
L117: cosmic ray events (delete triggered
L119: add commas after exercises and events
L121: ->without magnetic field
L123: continuously -> throughout
L127: adjusted -> made
commas after have and events
L130: synchronization at -> synchronization performed during
L135: What does "Indeed" signify? - delete it
L137: Run-by-run
L138: -> allowing a complete (delete for)
L142: comma after stages
L143,144: this sentence goes on and on. Delete: when the phase...cycle.
(it is not needed)
L146: maximum number of entries
L160: -> Throughout the CRAFT run,
Figure 4: add CMS 2008
Figure 4 caption: delay run -> delay setting
Figure 5 caption: ditto
Figure 6 caption: this data -> these data, (with the comma)
not in the read out -> not read out
L162: all data taking -> the data taking
L165,166: as large as...at least -> of at least one BX period
L167: -> within a range of 1015 ns.
L174,175 delete: This measurement.....Section.
L175: and it is -> and is
L180: allowing for a common displacement....this is an incorrect use of
"allowing for", but I am not sure what is intended
- possibly: allowing a common....position to be used.
L187: due to -> associated with
L190: Hereafter, the tsegment folded into the 25 ns interval is referred
to as the "Phase".
L195: delete: in the BX time interval
L202: read out data available in -> data from
to be -> to agree
L205: vertically positioned -> vertical
delete "namely"
due to -> because of
Figure 7 caption: folded in -> folded into
replace colon with full
stop after interval
Figure 8 caption: example sector -> sector
Figure 9 caption: replace full stop after "chamber" with a comma and
delete "From top to bottom"
I have no idea what the last sentence means. Possibly replace with: The
correspondence between chambers and sectors is indicated on the x-axis
of the top plot?
L206: worse >- poorer
L207: referring -> defining
L208: horizontally positioned -> oriented close to the horizontal
direction
delete "namely"
L212: delete "almost"
L213: reflects -> demonstrates
It is not what we want point out …..
L214: alleviate -> reduce
L215: vertically positioned -> vertical
L216: in the MB1 chambers
L219: -> ...degrees, corresponding to the angular interval expected for
high transverse...
L224,225: -> summing over all trigger qualities...
Also change order: ...is above 80% and is independent....
Therefore, at the...
L228:" Other detectors...as well." What does this sentence mean?
There is RPC trigger …because
L232: it *will* therefore be possible..
L234: given -> fixed
L236: delete "just"
L241: even with -> with just
L244: at the same time -> concurrently
L245: comma after Moreover
L26: applied on -> applied to
L249: *by* requiring pointing...
L252: delete "example"
at LHC start-up
L253: -> their widths
L261: -> Cosmic ray events
L267: -> because the chambers are of identical design and are operated
under the same conditions.
L268: alleviate -> reduce
L271: "These...available" -> " Since these optimal phases have now been
determined,"
L274,275: The final sentence needs rewriting but I have run out of
steam. Do you plan to combine the results from the two mehods?
I expect results equal within ~1 ns .
-Scanned by iCritical.
[ MIME part of type text/html without a name stripped ]
Please
do you agree ? I am going to do the following updates.
Anna
Luc Pape wrote:
*** Discussion title: Review of CFT-09-025
Dear authors and ARC,
Congratulations. This paper is very interesting and demonstrates well the achievable time precision of the DT. I agree
with Gigi that it is, however, not so easy to read, although your argumentation is quite well understandable. Below, a
few comments.
Best wishes,
Luc
TYPE B
======
- l=54: I propose that you explain here the numbering (from -2 to +2) of the weels. At present, the weel -1 is mentioned
for the first time in the caption of Fig.4, where it is not defined.
You could also say where sector 1 is located ( important to understand some points later on).
Ok
- l=226: it was not clear to me where you obtained this efficiency from. It was not mentioned explicitely in Sect.4,
where it could have been. Moreover (unless I misunderstand your figure) it does not seem to agree with the plateau
value in Fig.8 right which is labelled "efficiency" but is lower than 80%.
in this paper as mentioned I hope clearly I consider just the DTLT of HH quality which is expected to be as in Fig. 8 .
At line =226 I am talking of the DTLT efficiency of any quality used for generating a L1A from the information of the
DT chambers
that is the HH+HL+LL+(H+anyTheta) trigger quality ; this efficiency is presented in the CFT-09-022 paper, figure 4 at
page 6.
It is above 80% everywhere but in a region of ~5ns where it is anyway above ~65% so I reported ~80%
TYPE A
======
- l=55: it would be good to define phi in words
- l=58: same thing for theta
I will introduce at line 51 a footnote like:
"CMS uses a right-handed coordinate system, with the origin at the nominal collision point,
the x-axis pointing to the centre of the LHC, the y-axis pointing up (perpendicular to the LHC
plane), and the z-axis along the anticlockwise-beam direction. The polar angle, theta, is measured
from the positive z-axis and the azimuthal angle, phi, is measured in the x-y plane."
- caption of Fig.3: could you not merge the last sentence with "The track crossing time..." to shorten the caption?
ok
- caption of Fig. 4: "wheel -1" is not defined (but see my comment above)
ok
- Fig. 5: could you add the symbols in the legend box please. As it stands it is not possible to identify the MBs in B/W
print.
ok
- l-204: if defined earlier, it is perhaps not necessary to define again the (1 to 12) and (-2 to +2)
Here I want just to remind the order in the plots of the wheels and of the sectors...I would prefer to leave them as they
are.
Anna
*** Discussion title: Review of CFT-09-025
Gigi Rolandi wrote:
> *** Discussion title: Review of CFT-09-025
>
> Dear Anna et al,
>
> the paper shows important results that will allow us to
> have quickly a well synchronized system at LHC startup.
> Congratulations.
>
> I have no problems with the physics content of the paper,
> that I think I was able to understand reasonably well, but
> with a superficial reading.
>
> The paper however reads not so easily and could be
> made more fluent by somebody who writes english better
> than I do.
>
> I attach here some comments , all style related.
>
Dear Gigi,
thanks for the comments.
If Arc member agree, I do implement in the Final Readind version almost
all your suggestions but one of the last. Please find inline the reasons.
Best regards,
Anna
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
Best, Gigi
Type A
Abstract
The barrel muon trigger of the CMS experiment uses self-triggering
arrays of
drift tubes and performs the identification of the bunch crossing that
produced the muon using a rather sophisticated algorithm.
Abstract
In this paper the synchronization performed DURING AN EXTENDED
COSMIC-RAY RUN is described and the results are reported.
Line 4 add something like
In oder to achieve very high luminosity the bunch crossing frequency
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
of the proton beams
is large : 40.08 MHz.
and delete the first sentence of the next paragraph, and replace the
second by
This large BX frequency requires an accurate synchronization of all
detector components that trigger the data acquisition identifying the
bunch crossing..... In the muon barrel detector
line 10 delete measurement
Line 10 delete the sentence starting with Since
Paragraph starting al line 13 change to:
The Drift Tubes Local Trigger (DTLT) electronics generates trigger
primitives based on the measurements of the Drift Tubes (DT) detectors
of the barrel muon system of CMS . In each chamber, the DTLT generates
track segments from the alignment of hits and assigns the BX. A unique
identification of the BX, independent of the muon momentum and
direction, requires the phase of the sampling clock of the DTLT
electronics to be adjusted with a precision of 1 ns. This adjustment
can be achieved using a programmable delay (0-25 ns) available in
each chamber. This "fine synchronization" is the topic of this paper.
Also at this introductory level you could suppress the "In each
chamber, the DTLT generates track segments from the alignment of hits
and assigns the BX".
36: add : This paper is organized as follows.
39:
and cannot be applied to LHC (no parentheses)
42: delete the last sentence
delete 45-51 and place the TTC definition later in the text replacing
TTC at line 61 with
Trigger and Timing Control system (TTC)[4]
63 coming from --> of
72 All possible trigger (remove "the")
73 said to be of --> named
95 delete the last sentence of the paragraph (repetition with previous
section).
101 take out the parenthetic statement (repetition)
131 do you need
the parenthetic statement ?
135 delete "indeed"
170 explained --> discussed
Figure 7: the legend (ALL) and the caption (WITHOUT) do not match. The
text matches with the legend.
205/215: vertically positioned sectors : the sectors that measure
horizontal tracks
208 "horizontally positioned --> that measure almost vertical tracks
> 217 stray magnetic field AFFECTING TEH DRIFT VELOCITY (??? I am not
> sure)
>
> 224 Replace the first sentence:
> The study of Ref. [10] shows that the efficiency of DTLT primitives is
> independent of the local clock
> phase and above 80%.
>
> 268-270 I am not sure that the statement is correct.... It is just
> because of the statistics of
> the horizontal muons.
>
It is not really a problem of statistic on our side: it is due to the
systematic error which can be caused in these sectors by using the
computation of the mean values of the tTrig in the two r-phi SLs of the
chambers. The tracks in these sectors have a large angles and they can
be coming or from outside to the IP or viceversa. That make the rising
edge of the "timeboxes" of the two SLs very broad and the tTrig mean
values in the two SLs sometime not equal within ~ns suffering , in this
computation, also of poor statistics.