Institution disk space - policy reminder, the BNL case
Updated on Wed, 2007-02-21 12:07. Originally created by jeromel on 2007-02-21 11:38.Speaker : All ( All )
Talk time : 12:35, Duration : 00:10
SVT development task list
Updated on Wed, 2007-02-21 12:07. Originally created by jeromel on 2007-02-21 11:38.Speaker : J. Lauret ( BNL )
Talk time : 12:25, Duration : 00:10
We will discuss and inspect the list available at You do not have access to view this node with feedback and requests from Helen Caines.
Error fitting with Sti, status report
Updated on Wed, 2007-02-21 12:06. Originally created by jeromel on 2007-02-21 11:35.Speaker : Victor Perevoztchikov ( BNL )
Talk time : 12:15, Duration : 00:10
BBC ADC Signatures of SpaceCharge azimuthal anisotropy
Updated on Wed, 2007-02-21 11:35. Originally created by jeromel on 2007-02-21 11:33.Speaker : G. Van Buren ( BNL )
Talk time : 12:00, Duration : 00:15
BBC ADC Signatures of SpaceCharge azimuthal anisotropy
Updated on Fri, 2008-10-03 18:48. Originally created by genevb on 2007-02-21 11:02. Under:In my azimuthal sDCA studies, I observed static and dynamic azimuthal asymmetries in the CuCu200 data. One suggested possible way to avoid this in upcoming heavy ion runs is to see if there are any online scalers which could be used to give feedback to C-AD as to whether backgrounds at STAR are acceptable in terms of TPC ionization distortions. Towards this end, I have begun a study of whether the BBC scalers might be useful in this regard.
It is important to understand some things about the BBC geometry (see this postscript file). Ideally, the large outer tiles are closer to the TPC and more likely represent information relevant to what is happening in the TPC. We would most likely want to implement scalers for these in an upcoming heavy ion run. Unfortunately, in the past we have only taken ADC data with these large tiles. I have already done a study using scaler information from the small BBC tiles which demonstrates some fluctuations at similar azimuth to where the TPC shows problems.
For this study, I use only the outer ring of large BBC tiles on the east and west ends separately. These twelve tiles (numbered 25-36) are covered by 4 PMTs (numbered 21-24), which integrate over 3 tiles each, spanning nearly equivalent ranges of azimuth. Also, to avoid biasing the ADC contributions towards those from triggered nuclear collisions, only zerobias events are useful for such analysis.
I have arranged the following plots similarly to my azimuthal sDCA studies. I define NADC (normalized ADC values) to be the rate of a given PMT's ADC divided by the sum of all 8 large tile PMT ADCs. This is done simply to normalize against overall changes in gains.
In the plots below, the first row shows the <NADC> (mean normalized rate) value for each phi bin. In the subsequent rows, I plot NADC-<NADC> versus day (with each phi bin offset) to see what's happening on sub-day time scales, and versus day in a colored 2D graph to see what's happening on larger time scales. There are three sets of plots: the first is all the CuCu200 BBC FF ADC data I have for zerobias triggers; the second is the CuCu200 BBC RFF ADC data I have between days 20 and 46 for all triggers (zerobias trigger data only seems to be available after day 32); the third is RFF zerobias data only for days 37-44 (runs 6037039-6044001) to provide more direct comparison with the CuCu200 data in the sDCA studies.
Additional comments below the plots.
CuCu200 FF
Zerobias triggers.
| 2005 CuCu 200 FF | Large outer tiles east | Large outer tiles west |
|---|---|---|
| <NADC> |
 |
 |
| NADC - <NADC> vs. day |
 |
 |
| NADC - <NADC> vs. day |
 |
 |
CuCu200 RFF
Zerobias triggers only started in this data on day 32, so this is ALL TRIGGERS starting on day 20.
| 2005 CuCu 200 RFF | Large outer tiles east | Large outer tiles west |
|---|---|---|
| <NADC> |
 |
 |
| NADC - <NADC> vs. day |
 |
 |
| NADC - <NADC> vs. day |
 |
 |
Just a small note as to why I started with day 20 (even though there is earlier data): there seemed to be some notable changes in running conditions and/or gains during the period prior to day 20, as can be seen in these variance charts:
| 2005 CuCu 200 RFF | Large outer tiles east |
|---|---|
| NADC - <NADC> vs. day |
 |
CuCu200 (days37-44)
Zerobias data, RFF.
| days 37-44 | Large outer tiles east | Large outer tiles west |
|---|---|---|
| <NADC> |
 |
 |
| NADC - <NADC> vs. day |
 |
 |
| NADC - <NADC> vs. day |
 |
 |
While there are some faint signs of fluctuations in the azimuthal BBC large tile ADC data, these fluctuations seem to be rather small. My conclusion at this point is that the BBC ADC data is not as sensitive to the problematic backgrounds as the BBC scaler data, despite being at larger radius.
Embedding HF meeting #1
, at 00:00 (GMT), duration : 00:00
Purpose: Technical and Historical background & status update
- Andrew will send Jerome the side
related Emails in regard of feedback gathering and the run selection
provided by the PAs.
On the technical/physics detail: there are no apparent technical detail at this stage, the code seems to be running. The default vertex finder (Minuit improved) relying on the B-EMC would likely be problematic and in fact, no vertex are currently reconstructed. This may be due to many issues (would need to trace and debug). The following options to be used were suggested as either:
- VFFV Fixed vertex finder (0,0 TBC)
- VFMCE Vertex finder used as within McEvent
The choice of one or the other depends on Physics objectives. Queried mid-2006, it was unclear what was the PA's perception nor needs related to the vertex.
- Andrew will check the VF options and report (one job each or 10 events)
- The choice of VF will be sorted out the PWGC and the PAC on Thursday.
Some issues and concerns have been emitted as per the meaningfulnesses of the Upsilon embedding. The low number of upsilon and an analysis dominated by PID cuts and other analysis related error bars may indicate that a full embedding scheme could be an over-kill. Also, it is understood that the current
steps taken by the PA (going for pure simulation run for electron request) is out of 'alternate choice' rather than 'preferred choice' and it is agreed we would need to actively understand the request and its intent once again (and certainly "fully" understand it this time).
- Will discuss this issues with PWGC on Thursday
The issue of priority relevance was raised. Shall the priorities remain as they are rather than being revisited for "post QM" reality?
- Jerome will get back to Jamie and/or Alex & Manuel on this issue and get a new priority ordering out
- Jerome will set the meeting with the PWGC, PAC and Olga + Maxim if needed. It appears to first order that the requests would be back to an embedding request apart from the Upsilon to be discussed.
Here is the details of Heavy Flavor
requests:
First, the easy ones:
1121704015 J/Psi Au+Au
1112996520 pi0 62 GeV Au+Au
1112996461 e 62 GeV Au+Au
→
all closed be convenor's request
1154003633 J/Psi embedding
for pp2006
1154003721 Upsilon embedding for pp2006
→
have not tried yet, can't overcome pp2005 troubles
1154003879
electron embedding for Cu+Cu 2005
→
test sample done, QA done, production started
1154003931 pi0
embedding for Cu+Cu 2005
→
not yet done, but should not be a problem
1154003958 gamma
embedding for Cu+Cu 2005
→
not yet done, but should not be a problem
1154004033
electron embedding for p+p 2005
1154004074
pi0 embedding for p+p 2005
→
those two have been attempted many times, failed for various reasons.
The latest one - no primary vertex found in reconstruction
1166698660 J/Psi embedding in Au+Au
with shifted vertex
→
Sample produced, never heard from PAs (done in a rush before QM), no
QA
1166698180 Ds in d+Au
→
This request was turned into embedding just last week or so (was pure
simulation before).
1166698516
J/Psi embedding in Cu+Cu
1166698601
Upsilon embedding in Cu+Cu events
→
those two could be done, but would be good to get some input back on
QM J/psi sample.
1093385624 electron embedding for Au+Au 62
GeV
→ not done yet.
... could be very well approximated by other date available.
Modified Birmingham Files
Updated on Tue, 2007-07-24 08:09. Originally created by lbarnby on 2007-02-20 09:22. Under:P04if
Updated on Tue, 2007-02-27 13:29. Originally created by starembed on 2007-02-16 16:00. Under:-
Hit level check-up:
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