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The UIUC ATLAS TileCal Project. Project Head - Dr. Steven Errede. Niall Nethercote UIUC High Energy Physics Summer 1998. Contents. Background on Experimental Particle Physics The World-Wide ATLAS Project The UIUC ATLAS TileCal Project Sub-Module Fabrication

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The uiuc atlas tilecal project

The UIUC ATLAS TileCal Project

Project Head - Dr. Steven Errede

Niall Nethercote

UIUC High Energy Physics

Summer 1998


  • Background on Experimental Particle Physics

  • The World-Wide ATLAS Project

  • The UIUC ATLAS TileCal Project

    • Sub-Module Fabrication

    • Photomultiplier Tube (PMT) Testing

  • Our Web Site

Experimental particle physics

Topic 1

Experimental Particle Physics

Particle accelerating facility
Particle Accelerating Facility

  • Accelerating Ring

  • Detector

How is a particle detected
How is a Particle Detected?

  • Accelerate some matter (e.g. the quarks of protons)

  • Collide the quarks (and get a mess of gluons)

  • Interesting particles may form (e.g. top quark)

  • Detect the residual particles (e.g. w/ a PMT)

The world wide atlas project

Topic 2

The World-Wide ATLAS Project


  • CERN is the European Laboratory for Particle Physics

  • CERN is located in both France and Switzerland

  • It is very near Geneva, Switzerland

The lhc project
The LHC Project

  • Large Hadron Collider (LHC) Ring

  • Compact Muon Solenoid (CMS) Detector

  • AToroidal LHC Apparatus (ATLAS) Detector

  • CERN is upgrading in three major ways

The atlas project
The ATLAS Project

  • 144 institutes world-wide are collaborating on the ATLAS project

  • ATLAS is 5 stories tall!

  • ATLAS will detect proton-proton collisions

  • Its center of mass energy is 14 TeV!

  • ATLAS will start taking data in 2005

The uiuc atlas tilecal project1

Topic 3

The UIUC ATLAS TileCal Project

Uiuc and atlas

  • What part of ATLAS does the UIUC group work with?

  • The Scintillating Tile Hadron Calorimeter (pictured green)

  • Sub-modules are made of alternating layers of steel and scintillating tile (shown in next slide)

  • Groups of sub-modules are modules

  • Groups of modules form the Hadron Calorimeter

What does the uiuc group do
What Does the UIUC Group Do?

  • The UIUC ATLAS project is two-folded

    • Sub-Module Fabrication

    • Photomultiplier Tube (PMT) Testing

Hadron detection
Hadron Detection

  • How are hadrons detected with sub-modules and PMTs?

    • Hadron flies through scintillating tile and photons are released

    • Fiber optics route some photons to a PMT

    • Photons hit PMT and convert to photoelectrons (via photoelectric effect)

    • Electrons are multiplied inside PMT and a detectable signal results

Sub module fabrication
Sub-Module Fabrication

  • UIUC’s sub-module assignment

  • Glue machine

  • Prototype sub-module production

The sub module assignment
The Sub-Module Assignment

  • UIUC is responsible for producing 200 extended barrel sub-modules

  • In the extended barrel 9 sub-modules make up a module (and also recall that there are 64 modules circling around the beam axis)

  • So when you do the math it turns out that we are making about 1/3 of an extended barrel

Glue machine
Glue Machine

  • The glue machine will be used to apply very precise amounts of glue to the sub-modules

  • It is currently being constructed and will be ready for early 1999 when we begin to make some more sub-modules

  • Dr. Errede and Fred Cogswell (our machinist) have put the most work into the glue machine

Sub module prototype production
Sub-Module Prototype Production

  • During the Winter of 1996-1997 we constructed some prototype sub-modules

Photomultiplier tube pmt testing
Photomultiplier Tube (PMT) Testing

  • General

    • UIUC’s PMT testing assignment

    • Our PMT testing setup

  • The work that we did this summer

    • Dark Box modification

    • PMT Aging experiments

The pmt testing assignment
The PMT Testing Assignment

  • When ATLAS begins data taking it will be using approximately 10,000 PMTs!

  • Here at UIUC it is our job to test over 3,000 of those PMTs (i.e. about 1/3 of ATLAS’s PMTs)

Our laboratory
Our Laboratory

  • Here is a shot of Dr. Errede’s Laboratory

  • Note the crates and the dark box

Our dark box
Our Dark Box

  • Here the crates are on the left, the dark box is on the right, and that’s Jori walking into the lab

  • The mess of wires that run in and out of the dark box

  • The dry nitrogen system can also be seen

Inside the dark box
Inside the Dark Box

  • This is our PMT testing layout that is housed in the dark box

Dark box modification
Dark Box Modification

  • Our group needs to prepare for the testing of the over 3,000 PMTs

  • The biggest task is modifying the dark box so that it can test 30-40 PMTs at one time

  • The dark box modification projects are:

    • Adjusting the layout of the dark box

      • Stepper Motor

      • Filter Wheel

    • Increasing the amount of light to the Photodiode

      • Faster Transistor for the Pulsing Circuit

      • Charge Cable

      • Optics

The stepper motor
The Stepper Motor

  • The stepper motor will be used to move components around inside the dark box

  • Before this summer Jori Ruppert-Felsot worked with the stepper motor

  • Then when the summer began John Patti and Mike Griswold finished up the task

The filter wheel
The Filter Wheel

  • The filter wheel will be used to vary the intensity of the light goes to the PMT

  • The stepper motor will rotate the filter wheel

The photodiode needs more light
The Photodiode Needs More Light

  • Three different attempts at supplying the Photodiode with more light have been attempted this summer

  • Mainly Jori Ruppert-Felsot, Dan Dombeck, and I have been working on this

  • For the most part all attempts have been unsuccessful

    • Using a faster transistor or a circuit that incorporates two transistors

    • Hooking a charge cable up to the LED

    • Setting up an optics system that can focus light onto the Photodiode

Pmt aging experiment
PMT Aging Experiment

  • About one month ago we received a new 4th generation PMT (8C28R3) from CERN

  • We proceeded to test its aging characteristics

  • The new PMT was pulsed at a number of different frequencies for one week

  • The tests on this PMT ran for time intervals of approximately 24 hours

  • During our testing, the PMT experienced an equivalent of 50 years of running at ATLAS

  • Important Quantities: Npe and the Gain

Conclusions and then continuation
Conclusions and Then Continuation

  • We concluded that the gain of the new 4th generation PMT actually increased slowly while it was being pulsed for 50 equivalent years

  • This is rather odd. The PMT’s performance is seemingly improving as it ages?!

  • Possible explanation: charge may be collecting on the walls of the PMT, thus creating an electric field that focuses the e-

  • We then proceeded to perform more aging experiments on older 3rd generation PMTs that we had available in our lab

The uiuc atlas tilecal web site

Topic 4

The UIUC ATLAS TileCal Web Site

A new look
A New Look

  • During the middle of the summer I completely revamped our ATLAS Web Site

  • The URL for our Site is:

  • But lets first check out what the Old Site looked like

Thank you s
Thank You’s

  • I would like to thank the following people for teaching me so much this summer:

  • Jori Ruppert-Felsot

  • John Patti

  • Mike Griswold

  • Daniel Dombeck

  • And especially:

  • Dr. Steven Errede

The musings of john patti
The Musings of John Patti

  • This was John’s reaction when I told him how much work I was going to put into my presentation