Primary Collimator Live Page
Katherine's Status Report
Tony's Status Report
Klaus's Status Report
Michael's Web Page
Burnham's Web Page
Burnham's collimator pics
Keep Out Zones a la Allena
Previous Reports
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Qweak elog at JLab
Qweak Simulation Forum
Virginia Tech Update for Tracking Group,
Beamline simulation/design:
Not enough progress here since Mark is responsible for the simulations now to allow Juliette to work on G0 for awhile.
1. Geometry of the tungsten pluts delivered to Pavel D. He will simulate the high energy neutrons from this configuration and will determine the power deposited in the plugs. We can compare his power estimate to ours to give us confidence that our power and background estimates are correct.
2. Mark owes Allena and Katherine information on mini-torus performance for primary collimator moved 12.5 and 25 cm upstream of where it is, to help make final decision about where it should be. He'll try to get the information to them by next Wednesday so final decision can hopefully be made before next tracking meeting (to be discussed there).
Drift chamber:
1. Results below show drift time distributions for two X planes with no leaks in the chamber. Single plane effiencies for the two planes are measured to be 99.5% and 99.7%.
2. The U and V planes were sparking at lower voltages (< 1500 V); they have been examined in a lucite "test box". They couldn't be recovered so we are making new U and V planes with wider spacing between the copper traces. The frames are done and stringing should be done early next week.
3. Near term goal is to do tracking with the X-X'-U-V chamber and measure real resolutions across the drift cell.
4. One of our electronic noise problems was determined to be 200 kHz noise from our power supply. It is a switching power supply, which Bill Vulcan had warned against, but after Norm had ordered it. We have solved the problem for now with a Faraday cage around the supply, but two new linear supplies are on order and should arrive in a couple weeks.
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Figure 1 - Arrival time distribution with only one hit per event, x3 plane. |
Figure 2 - Arrival time distribution with only one hit per event, x4 plane. |
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Figure 3 - GARFIELD simulation of arrival time distribution (0-220 ns). |
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Figure 4 - Arrival time distribution, x3 plane. |
Figure 5 - Arrival time distribution, x4 plane. |
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Figure 6 - Picture of new grounding and mechanical support for cards. |
