Difference between revisions of "Bubble Chamber Beam Test May 2018"

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(Created page with "= '''Bubble Chamber Turn On''' = * '''Fill with natural N<sub>2</sub>O – test bubble chamber systems operation''' * '''With beam on bubble chamber radiator:''' # How doe...")
 
 
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 +
= [[Beam Setup and Measurement - May 2018]] =
 +
 +
 +
 +
 
= '''Bubble Chamber Turn On''' =
 
= '''Bubble Chamber Turn On''' =
  
−
* '''Fill with natural N<sub>2</sub>O – test bubble chamber systems operation'''
+
* '''Fill with natural C<sub>3</sub>F<sub>8</sub> – test bubble chamber systems operation'''
 +
 
 +
 
 +
* '''Thresholds code for C<sub>3</sub>F<sub>8</sub>: [[media:ThresholdsC3F8.xlsx]]
  
  
Line 17: Line 25:
 
# Measure beam on background by looking outside fiducial volume
 
# Measure beam on background by looking outside fiducial volume
 
# Measure background with beam to Faraday Cup in CEBAF beamline (about two meters from chamber)
 
# Measure background with beam to Faraday Cup in CEBAF beamline (about two meters from chamber)
−
# Measure neutron events in chamber. Neutron radiation detectors in injector region will indicate if any neutrons are generated (especially at beam kinetic energies higher than 8.5 MeV).
+
# Measure neutron events in chamber. Neutron radiation detectors in injector region will indicate if any neutrons are generated
  
  
Line 24: Line 32:
 
= '''Bubble Chamber Beam Test''' =
 
= '''Bubble Chamber Beam Test''' =
  
−
* '''Chamber is filled with natural N<sub>2</sub>O'''
+
* Bubble Chamber Run Plan
 +
:: Draft Run Plan: [[media:bubble_runplan.pdf]]
 +
:: Systematics: [[media:bubble_systematics_May2018.pdf]]
 +
:: Joe's [https://logbooks.jlab.org/entry/3571368 Dispersive and Non-Dispersive Optics] for last week's beam study data
  
 +
----
  
−
* '''Cross sections:'''
 
  
−
The cross sections are shown in the following figure:
 
  
−
[[file:CrossSections.gif||500px|]]
+
<span style="font-size:150%"> '''Run Plan:''' </span>
  
 +
* ''Prebeam Checkout:''
 +
# Neutron source test at 0.7, 1, 2, 5m
 +
# Establish background rate with no beam
  
−
* '''Expected rates:'''
 
  
−
The expected rates are calculated with 3 cm cell thickness and Bremsstrahlung beam from copper radiator.
+
* ''Check if Bubble Chamber is working properly:''
 +
# Establish high rate checkout beam:  5.74 MeV/c, 1uA (1 event per 5s)
 +
# Determine the initial operational pressure and temperature
 +
# Establish fiducial region for beam
 +
# Measure activity with beam in high pressure
 +
# Move beam +/-3 mm and search for 10% lower rate
 +
# Change spot size to 2, 3mm; observe 30% lower rate at 3mm
 +
# Current scan:  0.5 uA for 1 hour, 0.25 uA for 2 hours
 +
## Normalized yields should be identical
  
  
−
* The expected rates are shown in the following figure:  
+
* Composite image python script: [[media:combinebubbles.txt]] (rename file, change ".txt" to ".py")
  
−
[[file:gNaturalN2O.gif||500px|]]
 
  
 +
* ''Run high energy to low energy:''
  
−
* The expected rates with the latest data are shown in the following figure:
+
{| class="wikitable"
 +
|-
 +
| '''Beam Momentum (MeV/c)'''
 +
| '''Beam Kinetic Energy (MeV)'''
 +
| '''Beam Current (µA)'''
 +
| '''Time (hour)'''
 +
|-
 +
| 5.24
 +
| 4.75
 +
| 50
 +
| 31
 +
|-
 +
| 5.34
 +
| 4.85
 +
| 50
 +
| 40
 +
|-
 +
| 5.44
 +
| 4.95
 +
| 20
 +
| 13
 +
|-
 +
| 5.54
 +
| 5.05
 +
| 10
 +
| 6
 +
|-
 +
| 5.64
 +
| 5.15
 +
| 4
 +
| 3
 +
|-
 +
| 5.74
 +
| 5.25
 +
| 1
 +
| 3
 +
|}
  
−
[[file:gNaturalN2OData.gif||500px|]]
 
  
  
−
* The expected rates from oxygen isotopes are shown in the following figure:
 
  
−
[[file:gNaturalO.gif||500px|]]
+
= '''Shift Schedule''' =
  
 +
[[media:ShiftSchedule_Bubble_May2018.pdf]] [[media:ShiftSchedule_Bubble_May2018.pdf]]
  
−
* The expected rate from <sup>14</sup>N(γ,p)<sup>13</sup>C with ThrCut = 50 keV is shown in the following figure:
 
  
−
[[file:g14Np_rate_ThrCut.gif||500px|]]
+
[[file:ShiftSchedule_Bubble_May2018.jpg||900px|]]
  
  
−
* Root macros to calculate <sup>14</sup>N(γ,p)<sup>13</sup>C with different threshold cuts (change .txt to .tar): [[media:Rate_14Ngp_ThrCut.txt]]
 
  
  
−
* <sup>17</sup>O(γ,n)<sup>16</sup>O cross section:
+
= '''Nominal Daily Plan''' =
  
−
[[file:cs17Ogn_new.gif||500px|]]
+
{| class="wikitable"
 +
|-
 +
!Thurday, May 10
 +
|-
 +
|Swing
 +
|'''p = 5.74 MeV/c, T = 5.25 MeV'''
 +
|-
 +
|
 +
|Establish beam in the injector
 +
|-
 +
|}
  
 +
{| class="wikitable"
 +
|-
 +
!Friday, May 11
 +
|-
 +
|Owl
 +
|p = 5.74 MeV/c, T = 5.25 MeV
 +
|-
 +
|
 +
|Start commissioning plan
 +
|-
 +
|Day
 +
|No beam
 +
|-
 +
|Swing
 +
|p = 5.74 MeV/c, T = 5.25 MeV
 +
|-
 +
|
 +
|Continue commissioning plan<br>Data for T = 5.25 MeV point
 +
|}
  
−
* The expected rate from <sup>17</sup>O(γ,n)<sup>16</sup>O is shown in the following figure:
+
{| class="wikitable"
 +
|-
 +
!Saturday, May 12
 +
|-
 +
|Owl
 +
|p = 5.74 MeV/c, T = 5.25 MeV
 +
|-
 +
|Day
 +
|'''p = 5.64 MeV/c, T = 5.15 MeV'''
 +
|-
 +
|
 +
|3+ hours for this point
 +
|-
 +
|Swing
 +
|p = 5.64 MeV/c, T = 5.15 MeV
 +
|-
 +
|
 +
|Set up for '''p = 5.24 MeV/c, T = 4.75 MeV''' when previous point done
 +
|-
 +
|
 +
|5.24 will be used to test if rates can be determined
 +
|-
 +
|}
  
−
[[file:g17On_rate.gif||500px|]]
+
{| class="wikitable"
 +
|-
 +
!Sunday, May 13
 +
|-
 +
|Owl
 +
|p = 5.24 MeV/c, T = 4.75 MeV
 +
|-
 +
|Day
 +
|'''p = 5.54 MeV/c, T = 5.05 MeV'''
 +
|-
 +
|
 +
|Call Mom
 +
|-
 +
|
 +
|6 hours data
 +
|-
 +
|Swing
 +
|'''p = 5.44 MeV/c, T = 4.95 MeV'''
 +
|-
 +
|
 +
|16 hours data
 +
|-
 +
|}
  
 +
{| class="wikitable"
 +
|-
 +
!Monday, May 14
 +
|-
 +
|Owl
 +
|p = 5.44 MeV/c, T = 4.95 MeV
 +
|-
 +
|Day
 +
|p = 5.44 MeV/c, T = 4.95 MeV
 +
|-
 +
|Swing
 +
|'''p = 5.34 MeV/c, T = 4.85 MeV'''
 +
|-
 +
|
 +
|48+ hours
 +
|-
 +
|}
  
−
* The expected rate from <sup>17</sup>O(γ,n)<sup>16</sup>O with ThrCut = 130 keV is shown in the following figure:
+
{| class="wikitable"
−
 
+
|-
−
[[file:g17On_rate_ThrCut.gif||500px|]]
+
!Tuesday, May 15
−
 
+
|-
−
 
+
|Owl
−
* Root macros to calculate <sup>17</sup>O(γ,n)<sup>16</sup>O with different threshold cuts (change .txt to .tar): [[media:Rate_17Ogn_ThrCut.txt]]
+
|p = 5.34 MeV/c, T = 4.85 MeV
−
 
+
|-
−
 
+
|Day
−
 
+
|p = 5.34 MeV/c, T = 4.85 MeV
−
----
+
|-
−
 
+
|Swing
−
 
+
|p = 5.34 MeV/c, T = 4.85 MeV
−
 
+
|-
−
<span style="font-size:150%"> '''Run Plan:''' </span>
+
|}
−
 
 
−
 
 
−
* ''Check if Bubble Chamber is working properly:''
 
−
# Start with K.E. of 7.7 MeV
 
−
# Determine the initial operational pressure and temperature
 
−
# Measure bubble rate. The expected rate is 1 bubble per sec at 10 µA
 
−
# Measure rate vs beam current (0.01, 0.1 and 1.0 µA)
 
−
# Measure the number of bubbles for 30 minutes per beam current
 
−
 
 
−
 
 
−
* ''Suppression of <sup>14</sup>N(γ,p)<sup>13</sup>C events:''
 
−
 
 
−
# Start with beam at K.E. 7.0 MeV
 
−
# Increase beam K.E. by 0.2 MeV steps all the way to 8.6 MeV
 
−
# Adjust beam current to maintain a bubble rate of few per minute
 
−
# Measure the number of bubbles for 30 minutes per energy
 
−
# Reproduce the overall rate shown above
 
−
# At K.E. of 8.6 MeV, increase the chamber threshold by increasing the pressure. Suppress the <sup>14</sup>N(γ,p)<sup>13</sup>C events.
 
−
# Once <sup>14</sup>N(γ,p)<sup>13</sup>C is suppressed, the rate should drop by three orders of magnitude
 
−
 
 
−
 
 
−
* ''Measuring rates from <sup>18</sup>O(γ,α)<sup>14</sup>C:''
 
−
 
 
−
# Now the chamber is at the new pressure
 
−
# Start with beam at K.E. 7.2 MeV
 
−
# Increase beam K.E. by 0.2 MeV steps all the way to 9.2 MeV
 
−
# Adjust beam current to maintain a bubble rate of few per minute
 
−
# Measure the number of bubbles for 30 minutes per energy
 
−
# Reproduce the overall rate from oxygen isotopes shown above
 
−
# Note the change in slope of rates vs. beam K.E. and the sharp kink around 7.6 MeV
 
−
 
 
−
 
 
−
* ''Measuring <sup>18</sup>O(γ,α)<sup>14</sup>C cross section:''
 
−
 
 
−
# Start with beam at K.E. 7.4 MeV
 
−
# Increase beam K.E. by 0.1 MeV steps all the way to 8.4 MeV
 
−
# Adjust beam current to maintain a bubble rate of few per minute
 
−
# Perform Penfold-Leiss unfolding
 
−
 
 
  
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
| '''Beam Kinetic Energy (MeV)'''
+
!Wednesday, May 16
−
| '''Beam Current (µA)'''
+
|-
−
| '''Time (hour)'''
+
|Owl
 +
|p = 5.34 MeV/c, T = 4.85 MeV
 +
|-
 +
|Day
 +
|'''p = 5.24 MeV/c, T = 4.75 MeV'''
 +
|-
 +
|
 +
|24+ hours
 
|-
 
|-
−
| 7.4  
+
|Swing
−
| 10
+
|p = 5.24 MeV/c, T = 4.75 MeV
−
| 10
 
 
|-
 
|-
−
| 7.5
+
|}
−
| 10
+
 
−
| 10
+
{| class="wikitable"
 
|-
 
|-
−
| 7.6
+
!Thursday, May 17
−
| 10
 
−
| 5
 
 
|-
 
|-
−
| 7.7
+
|Owl
−
| 2
+
|p = 5.24 MeV/c, T = 4.75 MeV
−
| 5
 
 
|-
 
|-
−
| 7.8
+
|Day
−
| 2
+
|p = 5.24 MeV/c, T = 4.75 MeV
−
| 5
 
 
|-
 
|-
−
| 7.9
+
|Swing
−
| 1
+
|p = 5.24 MeV/c, T = 4.75 MeV
−
| 5
 
 
|-
 
|-
−
| 8.0
+
|}
−
| 1
+
 
−
| 5
+
{| class="wikitable"
 
|-
 
|-
−
| 8.1
+
!Friday, May 18
−
| 0.8
 
−
| 5
 
 
|-
 
|-
−
| 8.2
+
|Owl
−
| 0.4  
+
|p = 5.24 MeV/c, T = 4.75 MeV
−
| 5
 
 
|-
 
|-
−
| 8.3
+
|Day
−
| 0.2
+
|~fin~
−
| 5
 
 
|-
 
|-
−
| 8.4
 
−
| 0.2
 
−
| 5
 
 
|}
 
|}
  
  
−
The expected yield (counts) is shown in the following figure:
 
  
−
[[file:csO18_Yield_Brem_bg.gif||500px|]]
 
  
 +
= '''Presentations'''=
  
−
The Penfold-Leiss unfolded cross section is shown in the following figure:
+
* MCC 8 am presentation
  
−
[[file:csO18_Brem_Unfold_bg.gif||500px|]]
 
  
−
*  Root macro files used to generate the figures above (change .txt to .tar): [[media:BubbleTest_Sept.txt]]
 
  
−
= '''Analysis Files''' =
 
  
−
* '''Presentations'''
+
= '''Run Summary'''=
  
−
* MCC 8 am presentation: [[media:FirstTests.pdf]] [[media:FirstTests.pptx]]
+
* Summary of run information: [[media:Jlab_Bubble_May18_RunSummary.pdf]]
  
−
* Filling Chamber with nitrous oxide: Movie [https://drive.google.com/file/d/0B9ShTslvnOaCeFplbDU5NjZTSWs/view?usp=sharing]
 
  
−
* MCC 8 am movie first event: [[media:FirstBubble.gif]]
 
  
−
* September 12, 2015 Morning work: [[media:sept12morning.png]]
 
  
−
* September 12, 2015 Morning work: [[media:corrected.png]]
+
= '''Analysis'''=
  
−
* Events in fiducial volume: [[media:comp.png]]
+
* Composite image of all bubbles: [[file:Bubble_May2018_composite_all.png|center|1000px|]]
  
  
 +
* Composite image of all bubbles: [[file:Bubble_May2018_composite_all_negative.png|center|1000px|]]
  
−
* '''Beam Current:'''
 
  
−
The following command dumps the archived current readback (-A) from Keithley Picoammeter K6485 to a file:
+
*  Tarball of composites for each run (change .txt to .tar.gz): [[media:Bubble_May2018_composite.txt]]
−
 
−
mySampler -b "2015-09-10 18:00:00" -s 1s -n 14400 IFY5D04K6485dataRead > BubbleCur_Sept10.txt
 
  
−
* Data file of beam current on Bubble Chamber Faraday Cup or Radiator/Dump (September 10, 18:00 - 22:00): [[media:BubbleCur_Sept10.txt]]
 
  
−
* Data file of beam current on Bubble Chamber Radiator/Dump (September 11, 17:00 - 24:00): [[media:BubbleCur_Sept11.txt]]
 
  
−
* Data file of beam current on Bubble Chamber Radiator/Dump (September 12, 9:00 - 24:00): [[media:BubbleCur_Sept12.txt]]
 
  
−
* Data file of beam current on Bubble Chamber Radiator/Dump (September 13, 9:00 - 19:00): [[media:BubbleCur_Sept13.txt]]
+
= '''EPICS Data'''=
  
−
* Data file of beam current on Bubble Chamber Radiator/Dump (September 14, 13:00 - 24:00): [[media:BubbleCur_Sept14.txt]]
+
The following command dumps the archived data – Dipole field (G.cm), Dipole Hall probe (G), Current readback from BCM0L02 Gigatronics (µA), High channel readback from BCM0L02 new receiver (µA), Low Channel readback from BCM0L02 new receiver (µA), 5D Dump current (A) and Beam positions (mm) – every second to a file:
 +
 +
mySampler -b "2018-05-10 00:00:00" -s 1s -n 86400 MDL0L02.BDL dtm151:field IBC0L02Current IBC0L02MAGA IBC0L02MAGB IFY5D04K6485dataRead IPM5D00.XPOS IPM5D00.YPOS IPM5D01.XPOS IPM5D01.YPOS > BubbleChamber_EPICS_10May2108.txt
  
  
 +
'''Notes:'''
 +
# The nominal momentum is calculated from the dipole field with: p [MeV/c] = BdL [G.cm] / 1412 (when beam is in 5D line).
 +
# Use IFY5D04K6485dataRead for beam currents in 5D line. Unfortunately, the KEITHLY 6485 picoammeter was on fixed gain during part of the run, then use IBC0L02MAGA instead. The picoammeter saturates if beam currents are higher than the fixed current value. You may want to examine both current readbacks and use the one that gives currents close to what in the shift logs.
  
−
The following command dumps the archived current readback from BCM0L02 Gigatronics (µA) to a file:
 
 
   
 
   
−
mySampler -b "2015-09-15 15:00:00" -s 1s -n 18000 IBC0L02Current > BubbleCur_Sept15.txt
 
  
−
* Data file of beam current on Bubble Chamber Radiator/Dump (September 15, 15:00 - 20:00): [[media:BubbleCur_Sept15.txt]]
+
* Data file for May 10 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_10May2108.txt]]
  
−
* Data file of beam current on Bubble Chamber Radiator/Dump (September 16, 15:00 - 22:00): [[media:BubbleCur_Sept16.txt]]
 
  
−
* Data file of beam current on Bubble Chamber Radiator/Dump (September 17, 15:00 - 19:00): [[media:BubbleCur_Sept17.txt]]
+
* Data file for May 11 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_11May2108.txt]]
  
  
 +
* Data file for May 12 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_12May2108.txt]]
  
−
* '''Beam Energy:'''
 
−
 
−
The following command dumps the archived data relevant to measuring beam energy to a file:
 
−
 
−
mySampler -b "2015-09-10 18:00:00" -s 100s -n 6912 R027GSET R027GMES R027PSET R027PMES R028GSET R028GMES R028PSET R028PMES MDL0L02.BDL MDL0L02M > BubbleEne_Sept2015.txt
 
−
 
−
* Data file for beam energy measurements (September 10, 18:00 - September 18, 18:00): [[media:BubbleEne_Sept2015.txt]]
 
  
 +
* Data file for May 13 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_13May2108.txt]]
  
  
−
 
+
* Data file for May 14 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_14May2108.txt]]
−
= '''Logbook: List of Runs''' =
 
−
 
 
−
A copy of the paper logbook: [[media:Bubble_Chamber_Sept_2015_Runs_List.pdf]]
 
−
 
−
 
 
  
  
−
='''Things To Do Next'''=
+
* Data file for May 15 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_15May2108.txt]]
  
  
 +
* Data file for May 16 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_16May2108.txt]]
  
−
'''No Beam Checklist'''
 
−
* Survey and align 5D line
 
  
 +
* Data file for May 17 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_17May2108.txt]]
  
  
−
'''Beam Checklist'''
+
* Data file for May 18 (00:00:00 - 23:59:59): [[media:BubbleChamber_EPICS_18May2108.txt]]
−
* Calibrate 0L02 BCM
 
−
* Quad-center 0L02, 0L02A, 5D00, 5D01 and set BPM SOFs accordingly
 
−
* Measure beam position directly after radiator
 

Latest revision as of 16:24, 20 July 2018

Beam Setup and Measurement - May 2018

Bubble Chamber Turn On

  • Fill with natural C3F8 – test bubble chamber systems operation



  • With beam on bubble chamber radiator:
  1. How does CCD camera perform under beam-on conditions?
  2. Count rates on bubble chamber. Do we get single or multiple bubbles from Bremsstrahlung beam exposure?
  3. Measure gamma ray beam spatial profile as reflected by bubble distribution. Is collimator effective in defining the gamma-ray beam?
  4. Test the bubble chamber laser shutter (gumby shutter)


  • Background measurements:
  1. Measure beam off environmental background in chamber-injector area
  2. Measure beam on background by looking outside fiducial volume
  3. Measure background with beam to Faraday Cup in CEBAF beamline (about two meters from chamber)
  4. Measure neutron events in chamber. Neutron radiation detectors in injector region will indicate if any neutrons are generated



Bubble Chamber Beam Test

  • Bubble Chamber Run Plan
Draft Run Plan: media:bubble_runplan.pdf
Systematics: media:bubble_systematics_May2018.pdf
Joe's Dispersive and Non-Dispersive Optics for last week's beam study data


Run Plan:

  • Prebeam Checkout:
  1. Neutron source test at 0.7, 1, 2, 5m
  2. Establish background rate with no beam


  • Check if Bubble Chamber is working properly:
  1. Establish high rate checkout beam: 5.74 MeV/c, 1uA (1 event per 5s)
  2. Determine the initial operational pressure and temperature
  3. Establish fiducial region for beam
  4. Measure activity with beam in high pressure
  5. Move beam +/-3 mm and search for 10% lower rate
  6. Change spot size to 2, 3mm; observe 30% lower rate at 3mm
  7. Current scan: 0.5 uA for 1 hour, 0.25 uA for 2 hours
    1. Normalized yields should be identical



  • Run high energy to low energy:
Beam Momentum (MeV/c) Beam Kinetic Energy (MeV) Beam Current (µA) Time (hour)
5.24 4.75 50 31
5.34 4.85 50 40
5.44 4.95 20 13
5.54 5.05 10 6
5.64 5.15 4 3
5.74 5.25 1 3



Shift Schedule

media:ShiftSchedule_Bubble_May2018.pdf media:ShiftSchedule_Bubble_May2018.pdf


ShiftSchedule Bubble May2018.jpg



Nominal Daily Plan

Thurday, May 10
Swing p = 5.74 MeV/c, T = 5.25 MeV
Establish beam in the injector
Friday, May 11
Owl p = 5.74 MeV/c, T = 5.25 MeV
Start commissioning plan
Day No beam
Swing p = 5.74 MeV/c, T = 5.25 MeV
Continue commissioning plan
Data for T = 5.25 MeV point
Saturday, May 12
Owl p = 5.74 MeV/c, T = 5.25 MeV
Day p = 5.64 MeV/c, T = 5.15 MeV
3+ hours for this point
Swing p = 5.64 MeV/c, T = 5.15 MeV
Set up for p = 5.24 MeV/c, T = 4.75 MeV when previous point done
5.24 will be used to test if rates can be determined
Sunday, May 13
Owl p = 5.24 MeV/c, T = 4.75 MeV
Day p = 5.54 MeV/c, T = 5.05 MeV
Call Mom
6 hours data
Swing p = 5.44 MeV/c, T = 4.95 MeV
16 hours data
Monday, May 14
Owl p = 5.44 MeV/c, T = 4.95 MeV
Day p = 5.44 MeV/c, T = 4.95 MeV
Swing p = 5.34 MeV/c, T = 4.85 MeV
48+ hours
Tuesday, May 15
Owl p = 5.34 MeV/c, T = 4.85 MeV
Day p = 5.34 MeV/c, T = 4.85 MeV
Swing p = 5.34 MeV/c, T = 4.85 MeV
Wednesday, May 16
Owl p = 5.34 MeV/c, T = 4.85 MeV
Day p = 5.24 MeV/c, T = 4.75 MeV
24+ hours
Swing p = 5.24 MeV/c, T = 4.75 MeV
Thursday, May 17
Owl p = 5.24 MeV/c, T = 4.75 MeV
Day p = 5.24 MeV/c, T = 4.75 MeV
Swing p = 5.24 MeV/c, T = 4.75 MeV
Friday, May 18
Owl p = 5.24 MeV/c, T = 4.75 MeV
Day ~fin~



Presentations

  • MCC 8 am presentation



Run Summary



Analysis

  • Composite image of all bubbles:
    Bubble May2018 composite all.png


  • Composite image of all bubbles:
    Bubble May2018 composite all negative.png




EPICS Data

The following command dumps the archived data – Dipole field (G.cm), Dipole Hall probe (G), Current readback from BCM0L02 Gigatronics (µA), High channel readback from BCM0L02 new receiver (µA), Low Channel readback from BCM0L02 new receiver (µA), 5D Dump current (A) and Beam positions (mm) – every second to a file: 

mySampler -b "2018-05-10 00:00:00" -s 1s -n 86400 MDL0L02.BDL dtm151:field IBC0L02Current IBC0L02MAGA IBC0L02MAGB IFY5D04K6485dataRead IPM5D00.XPOS IPM5D00.YPOS IPM5D01.XPOS IPM5D01.YPOS > BubbleChamber_EPICS_10May2108.txt


Notes:

  1. The nominal momentum is calculated from the dipole field with: p [MeV/c] = BdL [G.cm] / 1412 (when beam is in 5D line).
  2. Use IFY5D04K6485dataRead for beam currents in 5D line. Unfortunately, the KEITHLY 6485 picoammeter was on fixed gain during part of the run, then use IBC0L02MAGA instead. The picoammeter saturates if beam currents are higher than the fixed current value. You may want to examine both current readbacks and use the one that gives currents close to what in the shift logs.










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