Difference between revisions of "Spectrometer"

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== Teleconference Logistic information ==
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{| cellpadding=5 style="margin:7px 30px 0 30px; <!--
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  BlueJeans calling instructions:
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  --> float:right; border:1px solid #AA6633"
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  Toll-Free Number (U.S.&  Canada):  888-240-2560
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|- bgcolor="#fbfeff"
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  International toll number:        408-740-7256
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| [[Main_Page|MOLLER Wiki]]
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  Bluejeans CODE:                 734 609 7559
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|-
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  Bluejeans link: https://bluejeans.com/7346097559
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|[https://moller.jlab.org/moller_root/ MOLLER page]
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|-
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[[File:Both toroids.PNG|thumb|upright=2.5|alt=text|The MOLLER spectrometer in TOSCA]]
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|[https://moller.jlab.org/cgi-bin/DocDB/private/DocumentDatabase DocDB]
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[[File:Layout.png|thumb|upright=2.5|alt=text|Layout of the hybrid torus conductor]]
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|-
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| [https://moller.jlab.org/moller_root/moller_project/MOLLER_Project.html Project]
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|-
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| [[Spectrometer_Meetings|Teleconferences]]
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|-
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| [https://bluejeans.com/7346097559 Bluejeans]
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|}
  
 
== Milestones ==  
 
== Milestones ==  
  
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# Iterations for hybrid/segmented downselect - November 15
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# [[hybrid/segmented downselect]] - <b>November 15 - done</b>
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## November 20, December 4th meeting
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# [[collimators]]  <b>mid- December - done</b>
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## Change control board meeting mid-December
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# [[Review irradiation papers]]  <b>mid-December - done</b>
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## prioritize recent blocky models for this
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# [[beam pipes and enclosures]] - <b>start mid-February</b>
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### Will new SC4 work cooling water tubes extra 4mm?
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# 60% Design review to do a prototype (possible spare) <b>March 8th</b>
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## remove hump, tail angle - probably not needed right now
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## Freeze design (config 9) by <b>February 7th</b>
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## Checks for
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## collimator 5, 6 dimensions needed <b>ASAP</b>
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### full distributions (1D and 2D)
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## Envelopes - before <b>end of February</b> 
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### optimization of tiles - deconvolution (is this necessary)
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# Dates for upstream 60% <b>Fall 2020?</b>
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#### use the current optimization of the tiles and run deconvolution code
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# 90% Design (everything!) - <b>DirRev - July 2023</b>
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### checking envelopes (probably not necessary for downselect)
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## Ready for CD2/3 Review
 +
  
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# Collimators  (mid- December)
 
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## collimator 1, 2 merge
 
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## hot spots on upstream
 
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### W plate
 
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### optimize the 2-bounce shield (Chandan, Naz)
 
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## collimator 4 (resculpting)
 
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## collimator 5 (including "septapus" for shielding)
 
  
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# Review irradiation papers by mid-December
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== Documentation ==
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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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## Do we trust the results?
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## Are the energies/species close enough?
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# beam pipes and enclosures - are major changes required? - Start mid-December
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To be reviewed: <br><br>
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## upstream enclosure and pipes (mid-December)
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# [[Specifications document | Specifications]]
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## clean beam transport due to the SAMs intrusions into the pipe
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# [[Nomenclature document | Nomenclature]]
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### Cip has a student designing the SAM intrusions
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# [[ Radiation dose papers]]
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## aperture in the dump tunnel
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# [https://userweb.jlab.org/~kashy/Moller/Beamline%202D%20drawings/ Song sheet]
  
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# Supports at low radius
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== Ongoing Work ==
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## inter-coil supports "under" the envelopes
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## now 2-bounce shield is load bearing?
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## DS torus "2-bounce" not needed, but septapus for shielding
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# Specifications document
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For both upstream and downstream coils, check with symmetric, asymmetric coils, and target motion
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## KK and Juliette will look at red text
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## We should meet to discuss these
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# Nomenclature documented (and used consistently)
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# Number, z location and inner radii of collimators
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# Envelopes
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## Actual envelop (what gets through a collimator)
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## Envelop for what hits the detector
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## Less subjective algorithm
 +
### 2D - integrate in x, y
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### 1%, 10% of rate?
 +
# Beam vs.  ee and ep generators at detector plane with backgrounds
 +
# Careful evaluation of all sources in the deconvolution
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## Charge particles
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## Photons
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## 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
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# Study rare backgrounds from bellows and the linkages between strongbacks in the downstream (which should be stainless steel?) (expensive ferrous-free materials)
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# Backgrounds as we degrade the vacuum (beam and acceptance)
  
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#  
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{| cellpadding=5 style="margin:7px 30px 0 30px; <!--
 +
  --> float:right; border:1px solid #AA6633"
 +
|- bgcolor="#fbfeff"
 +
| [[File:Both toroids.PNG|thumb|upright=1.5|alt=text|The MOLLER spectrometer in TOSCA]]
 +
|-
 +
|[[File:Layout.png|thumb|upright=1.5|alt=text|Layout of the hybrid torus conductor]]
 +
|}
 +
 
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* Tolerances
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** Physics - Done
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** Interference with envelopes - Done
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** Doses on coils
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*** [[Optimizing upstream coil shielding]] (Naz)
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** Clean transport to dump
  
 
== Working Group Members ==
 
== Working Group Members ==
  
 
* Internal Working Group
 
* Internal Working Group
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** Juliette Mammei (Leader)
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** James Fast (Project lead)
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** Krishna Kumar
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** Juliette Mammei (collaboration lead)
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** Jim Kelsey
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* External Working Group
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** Ernie Ilhoff
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* Review Committee Members (as needed)
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** Jason Bessuille
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** Seamus Riordan
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** Rakitha Beminiwattha
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* Students
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** Cameron Clarke
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** Sakib Rahman
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** Tyler Kutz
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* External Working Group
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* 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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