January 30, 2015 - Mott Group Meeting

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Folks,

Let's meet next Friday, January 30th at 1:30pm EST in TL-2236. Some topics are listed below.

In the meantime, the Run 1 wiki has been updated run a chronology of events/logbook entries and the final on-line spreadsheet of runs and on-line results: https://wiki.jlab.org/ciswiki/index.php/Run1_-_January_2015

Blue Jeans and Wiki

Toll Free Phone number: 1-888-240-2560
Int'l Call Phone numbers: http://bluejeans.com/numbers
Meeting ID: 175023762#
Web connection for desktop sharing: http://bluejeans.com/175023762
Wiki: https://wiki.jlab.org/ciswiki/index.php/January_30,_2015_-_Mott_Group_Meeting

Lessons learned from Run 1

  1. Small aperture mouts may be impractical. Thin foils on backing on larger aperture mount seemed okay.
  2. Improve capability for beam characterization (emittance, momentum, energy spread, bunch length)
  3. VWien+Solenoids more effective than HWien
  4. Make measurement, analysis, data logging as automatic and convenient as possible
  5. Learn how to analyze target video on-line and save for off-line
  6. Replace viewer with either gridded chromox or YAG crystal

Divvy-up analysis and summary writing

Analysis systematics
Energy and Time Cuts
Low and High Threshold
Polarimeter Systematics using "nominal" beam
Deadtime
Beam current
Target position
Beam position : 0.22um(1) and 1um(15)
Dump dipole
Polariimeter Systematics using "off-nominal" beam
PITA
Spin Dance
Spot size
Cavity phase
Beam measurements
Momentum
Harp calibration
Emittance
Energy spread
Target Thickness Extrapolation
High Threshold Foils : 2,4,5
Low Threshold Foils : 1,8,12,13,14,15

Goals/plans for beam test opportunity : Monday Feb 9 + Tuesday Feb 10

Test hardware TOF veto at 31MHz and 62MHz (6 hours)
Test FADC without TDC (2 hours)
Test FADC delayed operation (2 hours)
Measure emittance with Run 1 conditions (3 hours)

Simulation progress

Sibling thickness measurement status

FESEM measurements
profile of each target
profiles of 2-3 targets multiple foil locations (foil + preparation technique)
Sibling list
0.050 um, 6809-B (done)
0.225 um, 7029-B
0.350 um, 5613-D (changed from A)
0.500 um, 5275-C
0.625 um, 7028-B
0.750 um, 5134-B (done)
0.870 um, 3057-C
1.000 um, 5385-B
Notes
  • FESEM resolution is about 1.5 nm
  • Sibling list of foils used (note, 0.05um foil 12 does not have sibling and both 0.35um foils 8 and 14 have same sibling)
  • Images saved as TIFF (highest quality of TIFF, BMP, JPEG)
  • ImageJ is free image analysis software hosted by NIH
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