Difference between revisions of "Spectrometer"

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|- bgcolor="#fbfeff"
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| [[Main_Page|MOLLER Main]]
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| [[Main_Page|MOLLER Wiki]]
 
|-
 
|-
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|[https://moller.jlab.org/cgi-bin/DocDB/private/DocumentDatabase|DocDB]
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|[https://moller.jlab.org/moller_root/ MOLLER page]
 +
|-
 +
|[https://moller.jlab.org/cgi-bin/DocDB/private/DocumentDatabase DocDB]
 +
|-
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| [https://moller.jlab.org/moller_root/moller_project/MOLLER_Project.html Project]
 
|-
 
|-
 
| [[Spectrometer_Meetings|Teleconferences]]
 
| [[Spectrometer_Meetings|Teleconferences]]
 +
|-
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| [https://bluejeans.com/7346097559 Bluejeans]
 
|}
 
|}
  
 +
== Milestones ==
  
−
  BlueJeans calling instructions:
+
# [[hybrid/segmented downselect]] - <b>November 15 - done</b>
−
  Toll-Free Number (U.S.& Canada):  888-240-2560
+
# [[collimators]]  <b>mid- December - done</b>
−
  International toll number:        408-740-7256
+
# [[Review irradiation papers]] <b>mid-December - done</b>
−
  Bluejeans CODE:                    734 609 7559
+
# [[beam pipes and enclosures]] - <b>start mid-February</b>
−
  Bluejeans link: https://bluejeans.com/7346097559
+
# 60% Design review to do a prototype (possible spare) <b>March 8th</b>
 +
## Freeze design (config 9) by <b>February 7th</b>
 +
## collimator 5, 6 dimensions needed <b>ASAP</b>
 +
## Envelopes - before <b>end of February</b> 
 +
# Dates for upstream 60% <b>Fall 2020?</b>
 +
# 90% Design (everything!) - <b>DirRev - July 2023</b>
 +
## Ready for CD2/3 Review
 +
  
  
 +
== Documentation ==
  
−
[[File:Both toroids.PNG|thumb|upright=2.5|alt=text|The MOLLER spectrometer in TOSCA]]
+
To be reviewed: <br><br>
−
[[File:Layout.png|thumb|upright=2.5|alt=text|Layout of the hybrid torus conductor]]
+
# [[Specifications document | Specifications]]
 +
# [[Nomenclature document | Nomenclature]]
 +
# [[ Radiation dose papers]]
 +
# [https://userweb.jlab.org/~kashy/Moller/Beamline%202D%20drawings/ Song sheet]
  
−
== Milestones ==  
+
== Ongoing Work ==
−
# [[hybrid/segmented downselect]] - November 15
+
  
 +
For both upstream and downstream coils, check with symmetric, asymmetric coils, and target motion
  
−
# Collimators  (mid- December)
+
# Number, z location and inner radii of collimators
−
## collimator 1, 2 merge
+
# Envelopes
−
## hot spots on upstream
+
## Actual envelop (what gets through a collimator)
−
### W plate
+
## Envelop for what hits the detector
−
### optimize the 2-bounce shield (Chandan, Naz)
+
## Less subjective algorithm
−
## collimator 4 (resculpting)
+
### 2D - integrate in x, y
−
## collimator 5 (including "septapus" for shielding)
+
### 1%, 10% of rate?
 +
# Beam vs.  ee and ep generators at detector plane with backgrounds
 +
# Careful evaluation of all sources in the deconvolution
 +
## Charge particles
 +
## Photons
 +
## Light guide background
 +
# Determine amount of background that is delta rays or air
 +
## All info from vertex in one "container"
 +
## Other info, like what detector it hit in another "target"
 +
## Secondary signal electrons vs. true background electrons
 +
# Add US and DS vacuum vessels, bellows, linkages, and US beamline to the simulation
 +
# Study rare backgrounds from bellows and the linkages between strongbacks in the downstream (which should be stainless steel?) (expensive ferrous-free materials)
 +
# Backgrounds as we degrade the vacuum (beam and acceptance)
  
−
# Review irradiation papers by mid-December
+
{| cellpadding=5 style="margin:7px 30px 0 30px; <!--
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## Cip, KK, Kent, Juliette
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## Can we live with higher doses on the epoxy than we have been assuming?
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|- bgcolor="#fbfeff"
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## Do we trust the results?
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| [[File:Both toroids.PNG|thumb|upright=1.5|alt=text|The MOLLER spectrometer in TOSCA]]
−
## Are the energies/species close enough?
+
|-
−
 
+
|[[File:Layout.png|thumb|upright=1.5|alt=text|Layout of the hybrid torus conductor]]
−
# beam pipes and enclosures - are major changes required? - Start mid-December
+
|}
−
## upstream enclosure and pipes (mid-December)
+
−
## clean beam transport due to the SAMs intrusions into the pipe
+
−
### Cip has a student designing the SAM intrusions
+
−
## aperture in the dump tunnel
+
−
 
+
−
# Supports at low radius
+
−
## inter-coil supports "under" the envelopes
+
−
## now 2-bounce shield is load bearing?
+
−
## DS torus "2-bounce" not needed, but septapus for shielding
+
−
 
+
−
# Specifications document
+
−
## KK and Juliette will look at red text  
+
−
## We should meet to discuss these
+
  
−
# Nomenclature documented (and used consistently)
+
* Tolerances
 +
** Physics - Done
 +
** Interference with envelopes - Done
 +
** Doses on coils
 +
*** [[Optimizing upstream coil shielding]] (Naz)
 +
** Clean transport to dump
  
 
== Working Group Members ==
 
== Working Group Members ==
  
 
* Internal Working Group
 
* Internal Working Group
 +
** James Fast (Project lead)
 +
** Juliette Mammei (collaboration lead)
 +
* External Working Group
 +
* Review Committee Members (as needed)
  
−
* External Working Group
 
  
−
* Review Committee Members
 
  
  

Latest revision as of 14:04, 24 February 2023

MOLLER Wiki
MOLLER page
DocDB
Project
Teleconferences
Bluejeans

Milestones

  1. hybrid/segmented downselect - November 15 - done
  2. collimators mid- December - done
  3. Review irradiation papers mid-December - done
  4. beam pipes and enclosures - start mid-February
  5. 60% Design review to do a prototype (possible spare) March 8th
    1. Freeze design (config 9) by February 7th
    2. collimator 5, 6 dimensions needed ASAP
    3. Envelopes - before end of February
  6. Dates for upstream 60% Fall 2020?
  7. 90% Design (everything!) - DirRev - July 2023
    1. Ready for CD2/3 Review


Documentation

To be reviewed:

  1. Specifications
  2. Nomenclature
  3. Radiation dose papers
  4. Song sheet

Ongoing Work

For both upstream and downstream coils, check with symmetric, asymmetric coils, and target motion

  1. Number, z location and inner radii of collimators
  2. Envelopes
    1. Actual envelop (what gets through a collimator)
    2. Envelop for what hits the detector
    3. Less subjective algorithm
      1. 2D - integrate in x, y
      2. 1%, 10% of rate?
  3. Beam vs. ee and ep generators at detector plane with backgrounds
  4. Careful evaluation of all sources in the deconvolution
    1. Charge particles
    2. Photons
    3. Light guide background
  5. Determine amount of background that is delta rays or air
    1. All info from vertex in one "container"
    2. Other info, like what detector it hit in another "target"
    3. Secondary signal electrons vs. true background electrons
  6. Add US and DS vacuum vessels, bellows, linkages, and US beamline to the simulation
  7. Study rare backgrounds from bellows and the linkages between strongbacks in the downstream (which should be stainless steel?) (expensive ferrous-free materials)
  8. Backgrounds as we degrade the vacuum (beam and acceptance)
text
The MOLLER spectrometer in TOSCA
text
Layout of the hybrid torus conductor

Working Group Members

  • Internal Working Group
    • James Fast (Project lead)
    • Juliette Mammei (collaboration lead)
  • External Working Group
  • Review Committee Members (as needed)




old wiki

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