Pierrick M. Hanlet
I'm having fun doing physics for University of Texas at Arlington
on the DØ Experiment at
Fermi National Accelerator Laboratory
Present DØ Involvements:
Nearly all of my efforts are now geared toward the
Forward Proton Detector. Here we look at protons(anti-protons) which scatter elastically or diffractively, which accounts for 40% of the total cross section. The scattered protons(anti-protons) are detected between 20m and 60m downstream of the DØ interaction region very close to the Tevatron beam; hence our detectors are an integral part of the Tevatron beam pipe and are inserted very near to the beam itself. Pretty cool stuff!
Here is a blow up cartoon of an elastic event.
Here's a list of things that I'm doing"
To map our detector channels into the AFE and DFE electronics, I'm proposing
using the following:
- Layout of PW08 Rack. This drawing shows the placement of the Transition Patch Panel, or TPP, how the coax ribbon cables are routed, and how the flex cables attach between the TPP and cassettes.
- TPP layout: There is 1 TPP per AFE board. The labeling corresponds to AFE number "Ax" and MCM number "My". The horizontal lines correspond to the connectors for the coaxial ribbon cable. The dark shading shows which cables are connected to which AFE MCM. The larger boxes show how the detectors map into the AFEs.
- The cable map into PW08 will then look like this.
- For the sake of simplicity, I've generated a numbering scheme for the Cin:Apse pads which will be on the TPP.
- Here is the numbering scheme I've used for the Bulkhead connector pins.
- Using these maps, one can make the connections on the TPP using this map.
The circuit used in the TPP uses a diode to shape the signal. Due to the smallness of our signals out of the Amp/Shapers, we can forward bias the diode to keep it on so that the signal passes through. Huffman used this model to simulate the output, yielding this result. In the plot, the output is a 400µV, which would correspond to ~40fC of charge into the AFE. This is not yet optimized.
A block readout of the Stand-Alone DAQ, or SADAQ, is shown here. Note that the flow of signals is from left to right.
The Present configuration in the D0 Small Control Room is:
A block readout of the Readout and Trigger is shown here. Note that the flow of signals is from left to right.
- This is a more detailed view of the Readout and Trigger.
- Another view showing individual components and mapping is shown in this is the full chain for the FPD Readout and Trigger.
- Phase V Test Stand: Pictures of AFE support with cassette.
- Pictures of the TPP mounting frame with one comb and one partially stuffed TPP.
- First TPP signals: In both plots, the blue trace is the output of the pulse transformer and the purple trace is the output of the diode. The board is still missing a resistor and capacitor; the resistor will be needed if we have to forward bias the diode, and the capacitor might be needed to drain off excess charge. In the first plot, the scope time scale is 40 ns; the second plot shows the exponential decay on a 20 µs timescale.
What follows are some plots made with data from Run 75.
An interesting observation wrt the 20,000 series of the ADC plots is that there
are a number of plots with multiple peaks. The time cuts clean these up in the
- ADC Distributions: The plots include pedestal subtracted raw data (10,000 series),
zero suppressed data (20,000 series), and TDC cut zero suppressed data (30,000 series). The zero suppression is performed by requiring a minimum of 11 ADC counts. The TDC cuts are those described in a previous email.
- Analysis Distributions: The plots include the time cuts used in the remainder of the analysis; hit distributions in each plane; multiplicity distributions for
each plane; and multiplicity distributions for each detector, and multiplicity distributions for each detector with the requirement that each plane has 0 or 1 hit. Except for the time plots, all plots have suppression of the hot channels in U2 (these hot channels can be seen in the ADC distrubutions.)
- Event Selection Results: The events in this list are required to have 0 or 1 hits in each plane, and a minimum of 3 hits per detector for both P1D and P2D. The first column in the list is the counter which counts events passing these criteria; the second column is the event number as given in the data event. In Run 73, there are 186 events that satisfy these criteria!
Personal VxWorks page.
Previous DØ Involvements:
- Run II Muon Upgrade
- DØ Quantum Chromo-Dynamics
- Direct Photon Analysis
- QCD Tape Czar
- DØ Speakers' Bureau
Previous Photon Analysis Progress:
- Trigger Simulated MC Photon Trigger Efficiencies. Last page shows comparison to data.
- Selection Criteria Efficiencies
- Comparison of different fragmentation functions on the photon purity w/out smoothing of MC distributions
- Comparison of different fragmentation functions on the photon purity with smoothing of MC distributions
- Plot comparing
CDF and DØ
direct photon production as a function of ET in the central rapidity bin (|eta|<1.0). Both are compared to CTEQ2M and CTEQ4M using µ=ET. This plot will be used at both Moriond QCD and Pheno-CTEQ at the end of
March, and will be the first showing of new DØ photon results.
- Comparison of (data-theory)/theory vs xT for different experiments.
- Latest draft of Photon IB PRL .
This is displayed for observation only; I will go back this week and try to
determine why the IA purities appear as they do.
- Steve Linn's D0 Note 3564 describing the new 1b results.
- Steve Linn's D0 PAM talk.
Previous Muon Upgrade Progress:
- Comparison of polishing techniques D0
- Muon test stand results (example from run on 6 February, with counters from PDT241):
- Long term stability test results for LED Pulser System.
- Draft of LED Pulser System TDR. Note
that plenyastuff remains to be filled in.
- LMB Mixing homogeneity test 1: The
first two plots shows the average ADC counts
as seen by the PMT, PIN Diode, and PMT/PIN for each position measured in a
10X10 array after the light has been mixed. The first plots show the mixing
using a matched set of LEDs in the LED Block; the second shows the same for a
mis-matched set of LEDs. The last page makes the comparison of the matched and
unmatched LED blocks with errors; the error bars show the estimation of
systematic error introduced from insertion. It is clear from the values of
the variations that matching the LEDs improves the light homogeniety.
- LMB Mixing homogeneity test 2: shows
a sampling of the ratio PMT/PIN at 9 different positions along the blank fiber
block when the LED block is rotated 0-360 degrees in 90 degree increments. In
each plot, a comparison is made of an LED block with matched LEDs and one with
mismatched LEDs. The second curve confirms that the light is mixed by yielding
the same amount of light at any orientation of the LED block; however, it is
clear that matched LEDs yield a more homogeneous result.
- With the assumption that the light is well mixed from the mixing blocks,
we test the uniformity of light distribution
from the fibers. The inner error bars show the systematic error due to
inserting; the outer error bars show the systematic error due to taping the
connector. These errors cannot account for the large fluctuations; therefore
we surmise that the variations are due to inconsistent fiber preparation.
- Fiber polishing DØ Note 3561
- QCD '97: Talk on
Direct Photon Measurements at DØ and
conference proceedings; Montpellier, France - 3 July, 1997.
- PHENO/CTEQ '98: Talk on
Direct Photon Measurements at DØ
Madison, WI - 25 March, 1998.
- FNAL Users Meeting '98: Talk on
QCD Process at Fermilab; Fermilab, Batavia, IL - 13 July, 1998.
- Hadron Collider Physics '99:
CDF and DØ Photon and Di-Photon Results
Paper; Mumbai, India - 15 January, 1999,
If you want to contact me, I can be reached at:
Fermi National Accelerator Laboratory
P.O Box 500
Batavia, IL 50510-0500
(630) 840-8481 FAX
Here are some links to a few of my favorite things:
- For those of you in academia, you can download a
PostScript version of my
- For those of you in industry:
Back to the DØ home page
Please send comments to firstname.lastname@example.org
Last modified: Wed Jul 3 17:45:01 CDT 2002