Difference between revisions of "January 30, 2015 - Mott Group Meeting"

From Ciswikidb
Jump to navigation Jump to search
 
(27 intermediate revisions by 3 users not shown)
Line 15: Line 15:
 
==Lessons learned from Run 1==
 
==Lessons learned from Run 1==
  
−
==Divvy-up first round of off-line analysis==
+
# Small aperture mouts may be impractical.  Thin foils on backing on larger aperture mount seemed okay.
 +
# Replace viewer with either gridded chromox or YAG crystal, and learn how to use video and image tools
 +
# Make measurement, analysis, data logging as automatic and convenient as possible: [[Media:DataAnaScreen.pdf]] [[Media:DataAnaScreen.pptx]]
 +
# Improve or standardize our capability for beam characterization (emittance, momentum, energy spread, bunch length)
  
−
==goals/plans for beam test opportunity Feb. 6-9 weekend==
+
==Sibling thickness measurement status==
−
::Test hardware TOF veto at 31MHz and 62MHz
+
;FESEM measurements
−
::Test FADC without TDC
+
: profile of each target to sample thickness
−
::Test FADC delayed operation
+
: profiles of 2-3 targets multiple foil locations (tests uniformity + preparation technique)
−
::Measure emittance with Run 1 conditions
+
;Sibling list
−
 
+
'''::0.050 um, 6809-B (done)'''
−
==Simulation progress==
 
−
 
 
−
==Target thickness measurement status==
 
−
::0.050 um, 6809-B (done)  
 
 
::0.225 um, 7029-B
 
::0.225 um, 7029-B
−
::0.350 um, 5613-A
+
::0.350 um, 5613-D (changed from A)
 
::0.500 um, 5275-C
 
::0.500 um, 5275-C
 
::0.625 um, 7028-B
 
::0.625 um, 7028-B
−
::0.750 um, 5134-B (done)
+
'''::0.750 um, 5134-B (done)'''
 
::0.870 um, 3057-C
 
::0.870 um, 3057-C
 
::1.000 um, 5385-B
 
::1.000 um, 5385-B
 +
; Notes
 +
* FESEM resolution is about 1.5 nm @ 15keV  (l=h/p)
 +
* 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)
 +
* [http://imagej.nih.gov/ij/ ImageJ] is free image analysis software hosted by NIH
 +
 +
:Rough first analysis of two foils
 +
 +
[[File:thicknessAu5134b.pdf]]
 +
 +
[[File:asym_vs_thickness.pdf]]
 +
 +
==Divvy-up analysis and summary writing==
 +
 +
;Analysis systematics
 +
: Energy and Time Cuts
 +
* Suggestion described here [[File:ETCut.pdf]] and take from [ftp://ftp.jlab.org/pub/grames/thesis.pdf Grames thesis, pp.56-73]
 +
: 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==

Latest revision as of 19:19, 5 February 2015

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. Replace viewer with either gridded chromox or YAG crystal, and learn how to use video and image tools
  3. Make measurement, analysis, data logging as automatic and convenient as possible: Media:DataAnaScreen.pdf Media:DataAnaScreen.pptx
  4. Improve or standardize our capability for beam characterization (emittance, momentum, energy spread, bunch length)

Sibling thickness measurement status

FESEM measurements
profile of each target to sample thickness
profiles of 2-3 targets multiple foil locations (tests uniformity + 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 @ 15keV (l=h/p)
  • 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
Rough first analysis of two foils

File:ThicknessAu5134b.pdf

File:Asym vs thickness.pdf

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

Retrieved from "https://wiki.jlab.org/ciswiki/index.php?title=January_30,_2015_-_Mott_Group_Meeting&oldid=4377"