Difference between revisions of "CDC"

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m (Text replacement - "http://argus.phys.uregina.ca/gluex" to "https://halldweb.jlab.org")
 
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The new CDC page is [[Central Drift Chamber]]
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Up to [[Charged Particle Tracking]]
 
Up to [[Charged Particle Tracking]]
 
<table><tr><td width=200>
 
<table><tr><td width=200>
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*) Gary Wilkin wilkin@ernest.phys.cmu.edu
 
*) Gary Wilkin wilkin@ernest.phys.cmu.edu
  
[http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1437 Draft v1.0 of CDC NIM paper].
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[https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1437 Draft v1.0 of CDC NIM paper].
  
 
== CDC Construction ==
 
== CDC Construction ==
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* [[CDC_Construction_Details | Details of the CDC Construction]]
 
* [[CDC_Construction_Details | Details of the CDC Construction]]
 
* Submitted Documents
 
* Submitted Documents
** The documentation provided by CMU to Jefferson Lab as part of the [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1438 CMU Contract Submission].
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** The documentation provided by CMU to Jefferson Lab as part of the [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1438 CMU Contract Submission].
 
=== Fabrication Documentation ===
 
=== Fabrication Documentation ===
 
* Assembly documents
 
* Assembly documents
 
** [http://www.jlab.org/~vgr/CDC%20Design%202010/  Final CDC Drawings]
 
** [http://www.jlab.org/~vgr/CDC%20Design%202010/  Final CDC Drawings]
** [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1451 End plate Alignment]
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** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1451 End plate Alignment]
** [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1440 Straw Assembly and Insertion]
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** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1440 Straw Assembly and Insertion]
** [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1441 Wire String Details]
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** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1441 Wire String Details]
** [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1442 Summary of Tests]
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** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1442 Summary of Tests]
 
** [[Media:tension_measurement.pdf | Document describing the measurement]] of wire tensions.
 
** [[Media:tension_measurement.pdf | Document describing the measurement]] of wire tensions.
 
* Q&A Documents
 
* Q&A Documents
** [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1532 Straw-tube acceptance checks]
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** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1532 Straw-tube acceptance checks]
** [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1533 Aluminum Donut acceptance checks]
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** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1533 Aluminum Donut acceptance checks]
** [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1534 Aluminum Feedthru acceptance checks]
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** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1534 Aluminum Feedthru acceptance checks]
  
 
=== Production Documents ===
 
=== Production Documents ===
* [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1537 Conducting Epoxy Order Schedule]  
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* [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1537 Conducting Epoxy Order Schedule]  
 
* [http://www.jlab.org/~vgr/CDC%20Design%202010/  Final Drawings]
 
* [http://www.jlab.org/~vgr/CDC%20Design%202010/  Final Drawings]
  
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*Preparatory work with straws
 
*Preparatory work with straws
** GlueX-doc-1531 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1531 Comparison of CDC straws from different vendors]
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** GlueX-doc-1531 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1531 Comparison of CDC straws from different vendors]
 
**[[CDC_Straw_Sag_photos]]
 
**[[CDC_Straw_Sag_photos]]
 
**Straw irradiation tests
 
**Straw irradiation tests
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***[[Inspection with an optical microscope]]
 
***[[Inspection with an optical microscope]]
 
***[[LAMINA thin Al not radiated - optical microscope]] <- measured at JLAB
 
***[[LAMINA thin Al not radiated - optical microscope]] <- measured at JLAB
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 +
=== Mechanical tests ===
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With the cooperation of Tim and Slava we plan to do a couple of mechanical tests. During the review it was mentioned that we need to do more of these tests.
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 +
[[Leak tests]]
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[[Wiring test]]
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[[Sag test]]
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 +
[[Measure the thickness of the Al inside the straw]]
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[[Sag, compression, and twist test]]
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===Electrical hookup pics===
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 +
[[CDC  Electrical Hook Up Photos]]
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== Prototype studies ==
 
== Prototype studies ==
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[[CDC_Photos_2008| Photographs of the older, larger, CDC Prototype]]
 
[[CDC_Photos_2008| Photographs of the older, larger, CDC Prototype]]
 
===New prototype===
 
===New prototype===
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[[Energy/Amplitude as a function of drift time]]
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 +
[[Gas leak tests]]
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 +
[[Setup and tests]]
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[[First signals]]
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[[Gas mixture tests]]
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[[Pictures of the prototype]]
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[[Dimensions]]
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[[Planned mechanical/construction tests]]
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[[Resolutions]]
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[[More resolution studies]]
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[[Heated gas measurements]]
 
== Tracking ==
 
== Tracking ==
 
[[ 22 February 2008 ]]
 
[[ 22 February 2008 ]]
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[[ASIC design optimizations]]
 
[[ASIC design optimizations]]
  
[http://argus.phys.uregina.ca/gluex/DocDB/0010/001079/006/cdcasic.pdf  ASIC design optimizations tests writeup]
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[https://halldweb.jlab.org/DocDB/0010/001079/006/cdcasic.pdf  ASIC design optimizations tests writeup]
  
 
[[Shaper gain]]
 
[[Shaper gain]]
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=====[[New HVB]]=====
 
=====[[New HVB]]=====
  
== New prototype ==
 
We are planning to produce one or more smaller prototypes of the CDC to test in magnetic fields/test beams.
 
  
[[Heated gas measurements]]
 
 
[[Energy/Amplitude as a function of drift time]]
 
 
[[Gas leak tests]]
 
 
[[Setup and tests]]
 
 
[[First signals]]
 
 
[[Gas mixture tests]]
 
  
[[Pictures of the prototype]]
 
 
[[Dimensions]]
 
 
[[Planned mechanical/construction tests]]
 
 
[[Resolutions]]
 
 
[[More resolution studies]]
 
 
 
 
== Mechanical tests ==
 
With the cooperation of Tim and Slava we plan to do a couple of mechanical tests. During the review it was mentioned that we need to do more of these tests.
 
 
[[Leak tests]]
 
 
[[Wiring test]]
 
 
[[Sag test]]
 
 
[[Measure the thickness of the Al inside the straw]]
 
 
[[Sag, compression, and twist test]]
 
 
 
== Electrical Hookup tests ==
 
[[CDC  Electrical Hook Up Photos]]
 
  
  
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=== CDC Documentation ===
 
=== CDC Documentation ===
  
*) GlueX-doc-990 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=990 The GlueX Central Drift Chamber]
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*) GlueX-doc-990 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=990 The GlueX Central Drift Chamber]
*) GlueX-doc-979 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=979 The CDC Design Layout]
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*) GlueX-doc-979 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=979 The CDC Design Layout]
*) GlueX-doc-1079 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1079 The CDC ASIC for GlueX]
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*) GlueX-doc-1079 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1079 The CDC ASIC for GlueX]
*) GlueX-doc-1243 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1243 Gas Flow in the CDC]
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*) GlueX-doc-1243 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1243 Gas Flow in the CDC]
  
 
=== CDC Bi-weekly Status Reports (2007-8) ===
 
=== CDC Bi-weekly Status Reports (2007-8) ===
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== March 2008: PID/tracking review ==
 
== March 2008: PID/tracking review ==
[http://argus.phys.uregina.ca/gluex/DocDB/0009/000990/010/cdc_dr.pdf  GlueX CDC design and construction]
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[https://halldweb.jlab.org/DocDB/0009/000990/010/cdc_dr.pdf  GlueX CDC design and construction]
  
[http://argus.phys.uregina.ca/gluex/DocDB/0010/001010/001/cdctalk_nopause.pdf GlueX CDC design and construction talk]
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[https://halldweb.jlab.org/DocDB/0010/001010/001/cdctalk_nopause.pdf GlueX CDC design and construction talk]

Latest revision as of 12:39, 14 March 2017

The new CDC page is Central Drift Chamber

Up to Charged Particle Tracking

Row one in CDC.
The aluminum endplate.

The GlueX Central Drift Chamber

The CDC is a straw tube chamber that sits around the target in the GlueX experiment. The straws nominally run parallel to the beamline with readout on the upstream end of the chamber. About half of the straws are tilted with a 6 degree stereo angle to provide a measurement of the z position in two regions along the track. Tracks going more forward than about 30 degrees will also be tracked by the forward drift chamber system in the GlueX detector (FDC).

The 1.6 cm diameter straws are arranged in 28 radial layers. The inner-most layer is at about 10 cm and the outermost is at about 57 cm from the beamline. The chamber is anticipated to achieve a 150 micron position resolution in the r-phi plane, which when conbined with the stereo information will yield a number of z measurements with resolution of about a mm.

The most up-to-date description of the CDC is found in GlueX-document 990 which can be found on the portal http://portal.gluex.org . There are also up-to-date geometry tables in GlueX-document 979. There were also changes to this design that have been documents in GlueX-doc 744 and in document number 764 is the budget justification information for the chamber. All older documents should be considered out of date and probably inaccurate.

General information on charged particle tracking in Hall-D can be found on the Charged Particle Tracking wiki page.

The CDC is being built by the Medium Energy Physics group at Carnegie Mellon University http://www.cmu.edu . The current members of the CMU group involved in this effort are:

  • ) Curtis A. Meyer cmeyer@ernest.phys.cmu.edu
  • ) Gregg Franklin gbfranklin@cmu.edu
  • ) Yves Van Haarlem yvhaarle@ernest.phys.cmu.edu
  • ) Naomi Jarvis nsj@cmu.edu
  • ) Gary Wilkin wilkin@ernest.phys.cmu.edu

Draft v1.0 of CDC NIM paper.

CDC Construction

Fabrication Documentation

Production Documents

Photographs

More on construction

Mechanical tests

With the cooperation of Tim and Slava we plan to do a couple of mechanical tests. During the review it was mentioned that we need to do more of these tests.

Leak tests

Wiring test

Sag test

Measure the thickness of the Al inside the straw

Sag, compression, and twist test

Electrical hookup pics

CDC Electrical Hook Up Photos


Prototype studies

Simulations

dE/dx 350 MeV pions/protons

dE/dx 350 MeV pions/kaons/protons

dE/dx 250 MeV pions/kaons

H20 contamination tests

Old prototype

Photographs of the older, larger, CDC Prototype

New prototype

Energy/Amplitude as a function of drift time

Gas leak tests

Setup and tests

First signals

Gas mixture tests

Pictures of the prototype

Dimensions

Planned mechanical/construction tests

Resolutions

More resolution studies

Heated gas measurements

Tracking

22 February 2008

Electronics

ASIC meeting June 14, 2010

Charge division

Measuring Fe-55 X-rays with %2 interposer board

Electronic chain simulation

ASIC design optimizations

ASIC design optimizations tests writeup

Shaper gain

fADC timing

125 MHz Clock test

CDC High Voltage Board (HVB)

Pictures

Preamp 2

Preamp 3

Preamp4 (GlueXdoc1364 Tbl 2 Row 2)

This section (blue background) contains links to data obtained when our gas mixer was not operating reliably.


On June 23, we came to the conclusion that our old preamplifier bit the dust. Detailed pictures showing how its performance has changed over the last several months are below. These clearly show that the gain increased by a factor of at least four and that there is substantially more noise. This later turned out to be confusion caused by a faulty mix of gas.



The following link points to comparisons of cosmic data taken with the old preamplifier several months ago and with the new preamplifier. They clearly show that the signals (for the same gas and voltage settings) are larger with the new preamplifier.

The following plots are taken using the new preamplifier with our FADC range decreased to match the lower maximum output voltage from the new preamplifier (about 500mV). The old preamplifier had a higher limit (~1V).

Based on the fact that our old preamplifier died, the following plots should not be used to make comparisons between the old and new preamplifier.


(end of dodgy gas section)



Noise studies

New HVB

Misc

CDC Documentation

CDC Bi-weekly Status Reports (2007-8)

CDC_21_05_2008

CDC_09_04_2008

CDC_20_02_2008

CDC_06_02_2008

CDC_23_01_2008

CDC_19_12_2007

CDC_12_12_2007

CDC_28_11_2007

CDC_21_11_2007

CDC_14_11_2007

March 2008: PID/tracking review

GlueX CDC design and construction

GlueX CDC design and construction talk