Difference between revisions of "CDC"
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+ | The new CDC page is [[Central Drift Chamber]] | ||
+ | |||
+ | Up to [[Charged Particle Tracking]] | ||
+ | <table><tr><td width=200> | ||
+ | {| border="1" cellpadding="2" | ||
+ | |- | ||
+ | |width="200pt"|[[Image:Row_one_dry.jpg|thumb|none|250px| Row one in CDC.]] | ||
+ | | | ||
+ | |} | ||
+ | </td><td width=200> | ||
+ | {| border="1" cellpadding="2" | ||
+ | |- | ||
+ | |width="200pt"|[[Image:Sm soccer balls.jpg|thumb|none|250px| The aluminum endplate.]] | ||
+ | | | ||
+ | |} | ||
+ | </td></tr></table> | ||
== The GlueX Central Drift Chamber == | == The GlueX Central Drift Chamber == | ||
The CDC is a straw tube chamber that sits around the target in the | The CDC is a straw tube chamber that sits around the target in the | ||
GlueX experiment. The straws nominally run parallel to the beamline | GlueX experiment. The straws nominally run parallel to the beamline | ||
− | with readout on the upstream end of the chamber. About | + | 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 | 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 | 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 | about 30 degrees will also be tracked by the forward drift chamber system | ||
− | in the GlueX detector ([[ FDC ]]). | + | in the GlueX detector ([[FDC]]). |
− | The 1. | + | The 1.6 cm diameter straws are arranged in 28 radial layers. The inner-most |
− | layer is at about | + | 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 chamber is anticipated to achieve a 150 micron position resolution in | ||
the r-phi plane, which when conbined with the stereo information will yield | the r-phi plane, which when conbined with the stereo information will yield | ||
a number of z measurements with resolution of about a mm. | 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 | + | 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 were also | + | 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 | 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. | document number 764 is the budget justification information for the chamber. | ||
All older documents should be considered out of date and probably inaccurate. | 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 | The CDC is being built by the Medium Energy Physics group at Carnegie Mellon | ||
Line 27: | 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 | ||
− | == | + | [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1437 Draft v1.0 of CDC NIM paper]. |
− | + | ||
− | + | == CDC Construction == | |
+ | * [[CDC Fabrication Readiness Review]] (Pittsburgh, 21 October, 2010) | ||
+ | * [[CDC_Construction_Details | Details of the CDC Construction]] | ||
+ | * Submitted Documents | ||
+ | ** 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 === | ||
+ | * [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1537 Conducting Epoxy Order Schedule] | ||
+ | * [http://www.jlab.org/~vgr/CDC%20Design%202010/ Final Drawings] | ||
+ | |||
+ | === Photographs === | ||
+ | * [http://www.halld.org/CDC Photographs of the CDC Construction] | ||
+ | |||
+ | == More on construction == | ||
+ | *[[CMU_CLEAN_ROOM | Clean Room at CMU - Photos]] | ||
+ | *[[Assmbly Hub for the CDC | Hub assembly - Photos]] | ||
+ | |||
+ | *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 | ||
+ | |||
+ | === 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=== | ||
+ | [[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 == | ||
+ | [[ 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]] | ||
+ | |||
+ | [https://halldweb.jlab.org/DocDB/0010/001079/006/cdcasic.pdf 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) ===== | ||
+ | |||
+ | <div style="background:#e0f4fe"> | ||
+ | This section (blue background) contains links to data obtained when our gas mixer was not operating reliably. | ||
+ | |||
+ | <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. | ||
+ | |||
+ | |||
+ | * [[CDC_old_preamp_then_and_now]] | ||
+ | |||
+ | *[[CDC old & new preamp noise scope trace study]] | ||
+ | |||
+ | * [[New hv-plateau/efficiency curve]] | ||
+ | |||
+ | * [[Drift time comparison (gas check)]] | ||
+ | |||
+ | |||
+ | 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]] | ||
+ | |||
+ | 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]] | ||
+ | |||
+ | * [[Preamp 4: Comparison of 55Fe data with original preamp at lower voltage]] | ||
+ | * [[Preamp 4: 55Fe 'scope traces at lower voltage]] | ||
+ | |||
+ | <br> | ||
+ | (end of dodgy gas section) | ||
+ | </div> | ||
+ | <br> | ||
+ | |||
+ | * [[PreAmp tests with premixed gas]] | ||
+ | |||
+ | * [[Pedestal]] | ||
+ | |||
+ | * [[CDC_Preamplifier_Conclusion | Preamplifier Conclusions]] | ||
+ | |||
+ | * [[PreAmp_tests_with_premixed_90/10_Ar/CO2_-_software_threshold| Preamp tests with premixed 90/10 Ar/CO<sub>2</sub> - software threshold]] | ||
+ | |||
+ | |||
+ | |||
+ | [[Noise_studies|Noise studies]] | ||
+ | |||
+ | =====[[New HVB]]===== | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | == Misc == | ||
+ | |||
+ | === CDC Documentation === | ||
+ | |||
+ | *) GlueX-doc-990 [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=990 The GlueX Central Drift Chamber] | ||
+ | *) 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] | ||
+ | |||
+ | === 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 == | |
− | + | [https://halldweb.jlab.org/DocDB/0009/000990/010/cdc_dr.pdf GlueX CDC design and construction] | |
− | + | ||
− | + | [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
|
|
Contents
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
CDC Construction
- CDC Fabrication Readiness Review (Pittsburgh, 21 October, 2010)
- Details of the CDC Construction
- Submitted Documents
- The documentation provided by CMU to Jefferson Lab as part of the CMU Contract Submission.
Fabrication Documentation
- Assembly documents
- Q&A Documents
Production Documents
Photographs
More on construction
- Preparatory work with straws
- GlueX-doc-1531 Comparison of CDC straws from different vendors
- CDC_Straw_Sag_photos
- Straw irradiation tests
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.
Measure the thickness of the Al inside the straw
Sag, compression, and twist test
Electrical hookup pics
Prototype studies
Simulations
dE/dx 350 MeV pions/kaons/protons
Old prototype
Photographs of the older, larger, CDC Prototype
New prototype
Energy/Amplitude as a function of drift time
Planned mechanical/construction tests
Tracking
Electronics
Measuring Fe-55 X-rays with %2 interposer board
ASIC design optimizations tests writeup
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.
- Preamp 4 : Comparison of 'scope traces with earlier preamps
- Preamp 4: Comparison of 55Fe data with original preamp
- Preamp 4: Comparison of 55Fe data with original preamp at lower voltage
- Preamp 4: 55Fe 'scope traces at lower voltage
(end of dodgy gas section)
New HVB
Misc
CDC Documentation
- ) GlueX-doc-990 The GlueX Central Drift Chamber
- ) GlueX-doc-979 The CDC Design Layout
- ) GlueX-doc-1079 The CDC ASIC for GlueX
- ) GlueX-doc-1243 Gas Flow in the CDC