Difference between revisions of "CDC"

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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]]
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{| border="1" cellpadding="2"
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|-
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|width="200pt"|[[Image:Row_one_dry.jpg|thumb|none|250px| Row one in CDC.]]
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</td><td width=200>
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{| border="1" cellpadding="2"
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|-
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|width="200pt"|[[Image:Sm soccer balls.jpg|thumb|none|250px| The aluminum endplate.]]
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</td></tr></table>
 
== The GlueX Central Drift Chamber ==
 
== The GlueX Central Drift Chamber ==
  
Line 35: Line 47:
 
*) Gregg Franklin  gbfranklin@cmu.edu
 
*) Gregg Franklin  gbfranklin@cmu.edu
 
*) Yves Van Haarlem yvhaarle@ernest.phys.cmu.edu
 
*) Yves Van Haarlem yvhaarle@ernest.phys.cmu.edu
 +
*) Naomi Jarvis nsj@cmu.edu
 
*) 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].
+
[https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1437 Draft v1.0 of CDC NIM paper].
  
 
== CDC Construction ==
 
== CDC Construction ==
−
* [[CDC Fabrication Readiness Review]] (Pittsburg, XX XX, 2010)
+
* [[CDC Fabrication Readiness Review]] (Pittsburgh, 21 October, 2010)
 +
* [[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].
+
** 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 ===
 +
* Assembly documents
 +
** [http://www.jlab.org/~vgr/CDC%20Design%202010/  Final CDC Drawings]
 +
** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1451 End plate Alignment]
 +
** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1440 Straw Assembly and Insertion]
 +
** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1441 Wire String Details]
 +
** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1442 Summary of Tests]
 +
** [[Media:tension_measurement.pdf | Document describing the measurement]] of wire tensions.
 +
* Q&A Documents
 +
** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1532 Straw-tube acceptance checks]
 +
** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1533 Aluminum Donut acceptance checks]
 +
** [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1534 Aluminum Feedthru acceptance checks]
  
−
* Production Documents
+
=== Production Documents ===
 +
* [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1537 Conducting Epoxy Order Schedule]
 +
* [http://www.jlab.org/~vgr/CDC%20Design%202010/  Final Drawings]
  
−
== CDC Documentation ==
+
=== Photographs ===
 +
* [http://www.halld.org/CDC Photographs of the CDC Construction]
  
−
*) GlueX-doc-990 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=990 The GlueX Central Drift Chamber]
+
== More on construction ==
−
*) GlueX-doc-979 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=979 The CDC Design Layout]
+
*[[CMU_CLEAN_ROOM | Clean Room at CMU - Photos]]
−
*) GlueX-doc-1079 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1079 The CDC ASIC for GlueX]
+
*[[Assmbly Hub for the CDC | Hub assembly - Photos]]
−
*) GlueX-doc-1243 [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1243 Gas Flow in the CDC]
+
  
−
== CDC Bi-weekly Status Reports ==
+
*Preparatory work with straws
 +
** GlueX-doc-1531 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1531 Comparison of CDC straws from different vendors]
 +
**[[CDC_Straw_Sag_photos]]
 +
**Straw irradiation tests
 +
***[[Dose Calculation]]
 +
***[[Fe-55 spectra]]
 +
***[[Cut open straws]]
 +
***[[Inspection with an electron microscope]]
 +
***[[Inspection with an electron microscope II]]
 +
***[[Inspection with an optical microscope]]
 +
***[[LAMINA thin Al not radiated - optical microscope]] <- measured at JLAB
  
−
[[CDC_21_05_2008]]
+
=== 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.
  
−
[[CDC_09_04_2008]]
+
[[Leak tests]]
  
−
[[CDC_20_02_2008]]
+
[[Wiring test]]
  
−
[[CDC_06_02_2008]]
+
[[Sag test]]
  
−
[[CDC_23_01_2008]]
+
[[Measure the thickness of the Al inside the straw]]
  
−
[[CDC_19_12_2007]]
+
[[Sag, compression, and twist test]]
  
−
[[CDC_12_12_2007]]
+
===Electrical hookup pics===
  
−
[[CDC_28_11_2007]]
+
[[CDC  Electrical Hook Up Photos]]
  
−
[[CDC_21_11_2007]]
 
  
−
[[CDC_14_11_2007]]
+
== Prototype studies ==
 +
===Simulations===
 +
[[dE/dx 350 MeV pions/protons]]
  
−
== Photographs of the old CDC Prototype ==
+
[[dE/dx 350 MeV pions/kaons/protons]]
  
−
[[CDC_Photos_2008| Photographs of the CDC Prototype]]
+
[[dE/dx 250 MeV pions/kaons]]
 +
 
 +
[[H20 contamination tests]]
 +
===Old prototype===
 +
[[CDC_Photos_2008| 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 ==
 
== Tracking ==
 
[[ 22 February 2008 ]]
 
[[ 22 February 2008 ]]
−
 
−
== Wire tension measurement ==
 
−
[[Media:tension_measurement.pdf | Document describing the measurement]]
 
  
 
== Electronics ==
 
== Electronics ==
 +
 +
[[ASIC meeting June 14, 2010]]
  
 
[[Charge division]]
 
[[Charge division]]
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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]
+
[https://halldweb.jlab.org/DocDB/0010/001079/006/cdcasic.pdf  ASIC design optimizations tests writeup]
  
 
[[Shaper gain]]
 
[[Shaper gain]]
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[[ Pictures ]]
 
[[ Pictures ]]
  
−
== New prototype ==
+
[[Preamp 2]]
−
We are planning to produce one or more smaller prototypes of the CDC to test in magnetic fields/test beams.
+
  
−
[[Gas leak tests]]
+
[[Preamp 3]]
  
−
[[Setup and tests]]
+
===== Preamp4 (GlueXdoc1364 Tbl 2 Row 2) =====
  
−
[[First signals]]
+
<div style="background:#e0f4fe">
 +
This section (blue background) contains links to data obtained when our gas mixer was not operating reliably.
  
−
[[Gas mixture tests]]
+
<br>
 +
On June 23, we came to the conclusion that our <b>old</b> preamplifier <font color="red">bit the dust</font>. 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.
  
−
[[Pictures of the prototype]]
 
  
−
[[Dimensions]]
+
* [[CDC_old_preamp_then_and_now]]  
  
−
[[Planned mechanical/construction tests]]
+
*[[CDC old & new preamp noise scope trace study]]
  
−
[[Resolutions]]
+
* [[New hv-plateau/efficiency curve]]
  
−
[[More resolution studies]]
+
* [[Drift time comparison (gas check)]]
  
−
== Straw irradiation test ==
 
−
[[Dose Calculation]]
 
  
−
[[Fe-55 spectra]]
+
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.<br>
 +
* [[Preamp 4: Comparison of cosmic data with original preamp]]
 +
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).<br>
 +
* [[Preamp 4: Quick look at cosmic data with reduced fADC range]]
  
−
[[Cut open straws]]
+
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.
 +
* [[Preamp 4|Preamp 4 : Comparison of 'scope traces with earlier preamps]]
 +
* [[Preamp 4: Comparison of 55Fe data with original preamp]]
  
−
[[Inspection with an electron microscope]]
+
* [[Preamp 4: Comparison of 55Fe data with original preamp at lower voltage]]
 +
* [[Preamp 4: 55Fe 'scope traces at lower voltage]]
  
−
[[Inspection with an electron microscope II]]
+
<br>
 +
(end of dodgy gas section)
 +
</div>
 +
<br>
  
−
[[Inspection with an optical microscope]]
+
* [[PreAmp tests with premixed gas]]
  
−
[[LAMINA thin Al not radiated - optical microscope]]
+
* [[Pedestal]]
  
−
== Prototype simulations ==
+
* [[CDC_Preamplifier_Conclusion | Preamplifier Conclusions]]
−
[[dE/dx 350 MeV pions/protons]]
+
  
−
[[dE/dx 350 MeV pions/koans/protons]]
+
* [[PreAmp_tests_with_premixed_90/10_Ar/CO2_-_software_threshold| Preamp tests with premixed 90/10 Ar/CO<sub>2</sub> - software threshold]]
  
−
[[dE/dx 250 MeV pions/kaons]]
 
  
−
[[H20 contamination tests]]
 
  
−
== Mechanical tests ==
+
[[Noise_studies|Noise studies]]
−
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]]
+
=====[[New HVB]]=====
  
−
[[Wiring test]]
 
  
−
[[Sag test]]
 
  
−
[[Measure the thickness of the Al inside the straw]]
 
  
−
[[Sag, compression, and twist test]]
 
  
−
== March 2008: PID/tracking review ==
+
== Misc ==
−
[http://argus.phys.uregina.ca/gluex/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]
+
=== CDC Documentation ===
  
−
== Electrical Hookup tests ==
+
*) GlueX-doc-990 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=990 The GlueX Central Drift Chamber]
−
[[CDC Electrical Hook Up Photos]]
+
*) GlueX-doc-979 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=979 The CDC Design Layout]
 +
*) GlueX-doc-1079 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1079 The CDC ASIC for GlueX]
 +
*) GlueX-doc-1243 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1243 Gas Flow in the CDC]
  
−
== Endplate Layout ==
+
=== CDC Bi-weekly Status Reports (2007-8) ===
−
[[Assmbly Hub for the CDC]]
+
 
 +
[[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 ==
 +
[https://halldweb.jlab.org/DocDB/0009/000990/010/cdc_dr.pdf  GlueX CDC design and construction]
  
−
== Straws ==
+
[https://halldweb.jlab.org/DocDB/0010/001010/001/cdctalk_nopause.pdf GlueX CDC design and construction talk]
−
[[CDC_Straw_Sag_photos]]
+

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

Retrieved from "https://halldweb1.jlab.org/wiki/index.php?title=CDC&oldid=81451"