Difference between revisions of "Teller Light"
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Revision as of 14:42, 2 June 2017
5/31/2017
Run 6429 3 MeV 0.5 microsecond pulse width two toroids no Faraday cup PMT in cell 390 nm filter, HV = -1800, Shawn's mirror at 1 7/8 inches from downstream side of downstream toroid. PMT RMS/mean < 10%
Run 6430 Replaced 390 nm filter with 320 nm filter.
Run 6431 320 nm and 330 nm filters stacked.
Run 6432 Shawn's mirror on beam right which probes which part of the plume we are seeing moved to 18 inches. Still 320 + 330 nm filters in. Now just one planoconvex lens on accelerator side. Before we had two.
Run 6433 Now, just 320 nm filter in.
Run 6434. 390 nm filter in. ADC[5]/ADC[7] = 1.831
Run 6435. Beam right mirror moved to 5 feet. ADC[5]/ADC[7] = 1.55
Run 6436. 320 nm filter in.ADC[5]/ADC[7] = 1.765
We still have light from the extended plume getting to the PMT. We added some sewer pipe and black cloth to take care of this.
Run 6437. 329 filter in. Better optics to see just end of plume. Mirror 130.5 inches from toroid. ADC[5]/ADC[7] = 0.2176
Run 6438. Mirror now at 6.0 feet. ADC[5]/ADC[7] = 0.4202.
Run 6439. Mirror now at 7.5 inches.ADC[5]/ADC[7] = 0.8991
Run 6440. Looking at 18 inches. We changed several aspects of the optics. Board to block UV, no sewer pipe.
Run 6442. 0.5 usec wide beampulse, 80 mA peak, 320 nm filter, Removed sewer pipe, installed wall to block direct light from plume, removed mirror in the plume and sent light through 2" hole in plywood 18 inches downstream of toroid., used light at PMT to align light back to the beam line., ADC[5]/ADC[7] = 6.0 +/- 0.7
Run 6443. changed filter to 390 nm. ADC[5]/ADC[7] = 5.3 +/- 0.9
Run 6444. inserted 320 + 330 nm. ADC[5]/ADC[7] = 0.2 +/- 0.02
Run 6445. inserted 320 nm. hole in plywood is 29.5 inches from toroid, image from a light placed at the Cell PMT makes an image on the plywood. The plywood hole is upstream of the center of that image. ADC[5]/ADC[7] = 4.2 +/- 0.6Run
6446. hole in plywood is 40 inches from toroid, inserted two mirrors, ADC[5]/ADC[7] = 3.5 +/- 0.4
6447. hole in plywood is 51.75 inches from toroid, ADC[5]/ADC[7] = 3.085+/- 0.4
6448. hole in plywood is 88.5 inches from toroid, ADC[5]/ADC[7] = 2.8 +/- 0.37
6449. Aluminum tape is placed over the hole in the plywood board. hole in plywood is 88.5 inches from toroid as before, ADC[5]/ADC[7] = 1.965+/- 0.282
6450. Black cloth placed over hole in wall on accelerator hall side. Aluminum tape still placed over the hole in the plywood board. hole in plywood is 88.5 inches from toroid as before, ADC[5]/ADC[7] = 0.331+/- 0.04
Signal is from the accelerator hall
6451. Labeled mirrors A,B,C,D according to path of light from the beam line to the cell. Mirror "B" is poly blocked between mirror B and C, brick is closest to B. Black cloth off of hole to shielded cell.A DC[5]/ADC[7] = 1 +/- 0.2
6452. Mirror "B" is poly blocked between mirror B and C. Inserted poly brick between Mirror A and mirror B, closest to mirror B. ADC[5]/ADC[7] = 0.9 +/- 0.2
6453. Unblock the hole in the plywood. Mirror "B" is poly blocked between mirror B and C. Inserted poly brick between Mirror A and mirror B, closest to mirror B. ADC[5]/ADC[7] = 0.86 +/- 0.14
6/2/2017
We put in lots of collimation with sewer pipes, etc.
Run 645 320 nm filter in. z position (distance of hole in plywood to ) is .