Difference between revisions of "GlueX Target Meeting, May 17, 2011"
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# Review [[GlueX Target Meeting, April 12, 2011#Minutes|minutes from previous meeting]]: all | # Review [[GlueX Target Meeting, April 12, 2011#Minutes|minutes from previous meeting]]: all | ||
# Target Work Reports: all | # Target Work Reports: all | ||
| − | #* Target Requirements [ | + | #* Target Requirements [https://halldweb.jlab.org/talks/2011-2Q/Hall%20D%20Target%20Requirements.docx Target Requirements] [https://halldweb.jlab.org/talks/2011-2Q/GlueX%20Target%20General%20Layout-Sketch-1.pdf Target Layout] |
| − | #* Target P&I Diagrams | + | #* [https://halldweb.jlab.org/talks/2011-2Q/p_and_i_target.pdf Target P&I Diagrams] |
# MOU status: Mark | # MOU status: Mark | ||
| Line 25: | Line 25: | ||
==Slides== | ==Slides== | ||
| − | Talks can be deposited in the directory <code>/group/halld/www/ | + | Talks can be deposited in the directory <code>/group/halld/www/halldweb/html/talks/2011-2Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2011-2Q/ . |
=Minutes= | =Minutes= | ||
| − | Present: Hovanes Egiyan, Jim Fochtman, Mark Ito, Chris Keith, Tim | + | Present: Hovanes Egiyan, Jim Fochtman, Mark Ito, Chris Keith, Tim Whitlatch |
| − | + | ==Requirements== | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | We went over the [https://halldweb.jlab.org/talks/2011-2Q/Hall%20D%20Target%20Requirements.docx target requirements list] that Tim prepared. The following items came up in discussion: | |
| − | + | * Five hundred Gauss on the cold head is maximum according to the manufacturer. Is this OK? | |
| − | + | * We want to be able to cool the target in one shift. | |
| − | + | * The average diameter of the target is spec'ed at 2 cm. Is that OK? | |
| − | + | * Length of target is 40 cm: can this be finalized? | |
| − | + | * The maximum OD of the scattering chamber driven by start counter and that is driven in turn by the CDC. | |
| − | + | * What is the alignment requirement for target? | |
| − | + | * How well do we have to know the density of the liquid? | |
| − | + | Additional requirements were raised in the discussion: | |
| − | + | * specification of quality of scattering chamber vacuum (prevent freezing material on target) | |
| − | + | * flammable gas compatibility of system | |
| − | + | * interlock of nearby electrical systems and/or ignition sources if target cell ruptures | |
| + | ** hydrogen gas sensors will be needed | ||
| + | ** pressure switch on vacuum chamber | ||
| + | * specify stainless steel tubing | ||
| + | * specify welding whenever possible | ||
| − | + | ==Drawings== | |
| − | + | Tim showed the current [https://halldweb.jlab.org/talks/2011-2Q/GlueX%20Target%20General%20Layout-Sketch-1.pdf drawing of the target, scattering chamber, and start counter area] from Slava. | |
| − | + | ==P&ID== | |
| − | + | We looked over the two versions of a [https://halldweb.jlab.org/talks/2011-2Q/p_and_i_target.pdf piping and instrumentation diagram] for the target that Chris prepared | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | * Hydrogen and deuterium tanks outside connect to a single line going to the Hall. | |
| + | * A vent line goes outside hall; a manual valve is provided. | ||
| + | * The vacuum pump needs an explosion-proof motor. | ||
| + | * In the second version, the gas panel is mounted outside hall so changing gas could be done without access to the Hall. It would still be manual operation. | ||
| − | + | Other considerations: | |
| − | + | ||
| − | + | * We could put gas panel and control electronics in the "target" rack. | |
| + | * Electronics needed: | ||
| + | ** temperature controller | ||
| + | ** local visual read-back for pressure transducers would be nice to have | ||
| + | ** turbo controller for scattering chamber | ||
| + | ** vacuum gauge controller | ||
| + | * These designs allow automatic transition to cold gas in the target cell, but not to vacuum. | ||
| + | |||
| + | ==Next Area of Work== | ||
| + | |||
| + | * The next step is to work on the mechanical design for target condenser, cell, scattering chamber. | ||
| + | * We may not want to have the cold head provide any mechanical support; copper braid could provide flexible thermal coupling. | ||
| + | * Jim will contact Chris to work out issues before the next meeting | ||
Latest revision as of 20:36, 31 March 2015
Contents
Location, Time
Tuesday, May 17, 2011
1:00 pm EST
JLab: CEBAF Center, Room F224/225
Agenda
- Review minutes from previous meeting: all
- Target Work Reports: all
- Target Requirements Target Requirements Target Layout
- Target P&I Diagrams
- MOU status: Mark
Communication
Telephone
To connect by telephone:
- dial:
- US and Canada: (866)740-1260 (toll free)
- International: (303)248-0285 (toll call) or look up toll-free number at http://www.readytalk.com/intl
- enter access code followed by the # sign: 3421244#
Slides
Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2011-2Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2011-2Q/ .
Minutes
Present: Hovanes Egiyan, Jim Fochtman, Mark Ito, Chris Keith, Tim Whitlatch
Requirements
We went over the target requirements list that Tim prepared. The following items came up in discussion:
- Five hundred Gauss on the cold head is maximum according to the manufacturer. Is this OK?
- We want to be able to cool the target in one shift.
- The average diameter of the target is spec'ed at 2 cm. Is that OK?
- Length of target is 40 cm: can this be finalized?
- The maximum OD of the scattering chamber driven by start counter and that is driven in turn by the CDC.
- What is the alignment requirement for target?
- How well do we have to know the density of the liquid?
Additional requirements were raised in the discussion:
- specification of quality of scattering chamber vacuum (prevent freezing material on target)
- flammable gas compatibility of system
- interlock of nearby electrical systems and/or ignition sources if target cell ruptures
- hydrogen gas sensors will be needed
- pressure switch on vacuum chamber
- specify stainless steel tubing
- specify welding whenever possible
Drawings
Tim showed the current drawing of the target, scattering chamber, and start counter area from Slava.
P&ID
We looked over the two versions of a piping and instrumentation diagram for the target that Chris prepared
- Hydrogen and deuterium tanks outside connect to a single line going to the Hall.
- A vent line goes outside hall; a manual valve is provided.
- The vacuum pump needs an explosion-proof motor.
- In the second version, the gas panel is mounted outside hall so changing gas could be done without access to the Hall. It would still be manual operation.
Other considerations:
- We could put gas panel and control electronics in the "target" rack.
- Electronics needed:
- temperature controller
- local visual read-back for pressure transducers would be nice to have
- turbo controller for scattering chamber
- vacuum gauge controller
- These designs allow automatic transition to cold gas in the target cell, but not to vacuum.
Next Area of Work
- The next step is to work on the mechanical design for target condenser, cell, scattering chamber.
- We may not want to have the cold head provide any mechanical support; copper braid could provide flexible thermal coupling.
- Jim will contact Chris to work out issues before the next meeting
