GlueXWiki - Recent changes [en]

November 20, 2009 CDC Meeting

2009-11-20T18:40:33Z

Revision as of 18:40, 20 November 2009		Current revision
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	==New Action Items==		==New Action Items==
-		+	* Tim to pursue getting 10,00 Hall B crimp pins from Medelec since they have not completed the Hall B order yet
		+	* Curtis to check effect of 200 micron hole in crimp pin on resolution (vs 100 micron)
		+	* Slava to update Plastic wire insert drawing to match Hall B crimp pin
		+	* Tim to send some crimp pins, al donuts and feedthrus to CMU to check. JLAB will hold on to remainder until CMU ready.
		+	* Slava to produce drawings for swiss cheese plate and threaded insert for final review
		+	* Gary to machine and thread polycarbonate plate to verify that this is the proper material
		+	* Tim to update straw spec and drawings and get out to Lamina for quote.

	==Action Items/Decisions from Previous Meeting==		==Action Items/Decisions from Previous Meeting==
	* Slava to layout new setup to attach one connector stud to al plate and attach HV board directly to connector. will relocate connectors and check clearances with 8mm bend rad in wire		* Slava to layout new setup to attach one connector stud to al plate and attach HV board directly to connector. will relocate connectors and check clearances with 8mm bend rad in wire
		+	**<font color=blue> Complted work. Layout clearance good</font>
	* Tim to pursue Medelec 2 piece crimp pin quotes. Medelec said they could not make the one designed		* Tim to pursue Medelec 2 piece crimp pin quotes. Medelec said they could not make the one designed
-	**<font color=blue> Medelec will not make any more copper crimp pins of any design unless the order had already been placed. Tim Investigated other manufacturers to no avail. Hole/length ratio too small	+	**<font color=blue> Medelec will not make any more copper crimp pins of any design unless the order had already been placed. Tim Investigated other manufacturers to no avail. Hole/length ratio too small</font>
	* Beni to complete rad tests of straws in the next couple of weeks and send straws back to CMU for test		* Beni to complete rad tests of straws in the next couple of weeks and send straws back to CMU for test
-	**<font color=blue>s traws back at CMU	+	**<font color=blue>s traws back at CMU</font>
	* Have endplates delivered to JLAB for spot check of hole coordinates. Tim to arrange with survey group		* Have endplates delivered to JLAB for spot check of hole coordinates. Tim to arrange with survey group
-	**<font color=blue> Vendor to independently check with Faro arm. Do we still widh to bring these to JLAB?	+	**<font color=blue> Vendor to independently check with Faro arm. Do we still widh to bring these to JLAB?</font>
	* Fernando to look at stripping tools to reduce the need for large pcb on connector		* Fernando to look at stripping tools to reduce the need for large pcb on connector
	**<font color=blue> Stripping tool located, inner pad 3mm, 2mm gap , HV outer pad 6mm. Total wdth of pcb 30.5mm, 8mm bend rad required for cable</font>		**<font color=blue> Stripping tool located, inner pad 3mm, 2mm gap , HV outer pad 6mm. Total wdth of pcb 30.5mm, 8mm bend rad required for cable</font>
	== Notes ==		== Notes ==
-	# O-ring: The O-ring used on the prototype is a #103 BUNA-N Soft. The through-hole is 156 and the shoulder is a 9/32 into which the O-ring is forced.	+	* All agreed to pursue Hall B straight crimp pins. 200 micron hole, 12mm long, 1.47mm OD
-	# Small modifications to connector/grounding assembly [[Image:CDC Connector.pdf]]	+	* 3700 ea aluminum donuts and feedthru's received at JLAB
-	* Gary to check if he can still get conductive rubber boot used previously	+	* Will pursue threaded insert to compress o-ring to wire for sealing
-	* Slava to update layout of cable to crimp pin per discussion	+	* Lamina 300A alum on Mylar tubes passed radiation test. Will pursue procuring these straws.
		+	* Decided to have endplates shipped to JLAB fist for spot check
		+	* Fernando will ship some new preamp cards to CMU in January
		+	* Latest HV board connection layout accepted by all

November 23, 2009 (11AM), Physics Working Group

2009-11-20T17:33:55Z

/* Agenda */

Revision as of 17:33, 20 November 2009		Current revision
Line 9:		Line 9:

	== Agenda ==		== Agenda ==
		+
		+	Possible plan of action for evaluating the effects of a smaller magnetic field:
		+
		+	*1. Scale the charged particle momentum resolution in HDParSim.
		+
		+	*2. Update the acceptance tables in HDParSim to account for changes in geometrical acceptance.
		+
		+	*3. Study the EM background levels in the FCAL, TOF, and FDC. The increased backgrounds will require either (a) running at lower luminosity (how much lower?), or (b) increasing the dead area of the FDC or widening the holes in the TOF and FCAL (how much wider?).
		+
		+	*4. Assuming the central holes of the FCAL, TOF, and FDC need to be widened due to EM background, the acceptance tables in HDParSim would need to be updated.
		+
		+	*5. Study missing mass resolution.
		+
		+	::One possible study would be to see how much the background from:
		+
		+	:::gamma p --> pi+ pi+ pi- Delta0; Delta0 --> pi0 n
		+
		+	::leaks into
		+
		+	:::gamma p --> pi+ pi+ pi- n
		+
		+	::for different missing mass resolutions. The size of the background could be used as a measure of our sensitivity to an exotic wave (e.g. if the background from the Delta reaction is 10%, it becomes pretty dubious to fish out a 5% signal from the pi+ pi+ pi- n reaction).
		+
		+	*6. Study the shapes of acceptances in Gottfried-Jackson angles for 3pi reactions for different magnetic fields.
		+
		+	*7. Use the kinematic fitter and the TOF to see how much PID degrades with worse resolution (and a potentially larger hole in the TOF).
		+
		+	*8. Perform a PWA on 3pi final states. (This might not be necessary if step 5 or 6 show unacceptable degradation).

Minutes-11-19-2009

2009-11-19T21:06:23Z

Revision as of 21:06, 19 November 2009		Current revision
Line 3:		Line 3:
	Date: November 19, 2009		Date: November 19, 2009

-	Participants: Daniel, Mark S., Beni, Bill, Casey, Simon, Mark I., Eugene, Glenn, Brian	+	Participants: Daniel, Roger, Mark S., Beni, Bill, Casey, Simon, Mark I., Eugene, Glenn, Brian

	Next Meeting: November 26, 2009 @ 1:30 a.m.		Next Meeting: November 26, 2009 @ 1:30 a.m.
Line 100:		Line 100:
	the three cathode boards that make up a single panel were starting		the three cathode boards that make up a single panel were starting
	to peel off. Casey has improved the design using copper tape.		to peel off. Casey has improved the design using copper tape.
		+	- Roger has been in contact with our cathode board material supplier
		+	to get an update on our order delivery. Stay tuned.
	- The current draft of the cathode construction document is located at:		- The current draft of the cathode construction document is located at:
	/u/group/halld/Engineering/PRELIMINARY DOCUMENTS.		/u/group/halld/Engineering/PRELIMINARY DOCUMENTS.

Special:Log/delete

2009-11-19T20:42:20Z

deleted "[[Image:Offline links.pdf]]": putting pdf file into halldweb1 directories

Offline Computing Project Management

2009-11-19T20:41:26Z

links created

Revision as of 20:41, 19 November 2009		Current revision
Line 1:		Line 1:
-	* [[Planner views]]	+	* [http://halldweb1.jlab.org/project/offline_links.pdf Planner views (PDF)]
-	* [http://halldweb1.jlab.org/planning/offline_links.html Costs]	+	* [http://halldweb1.jlab.org/project/offline_links.html Costs (HTML)]
	* [[Steps for Offline Activities, 12 Gev Project]]		* [[Steps for Offline Activities, 12 Gev Project]]

Special:Log/upload

2009-11-19T20:35:18Z

uploaded "[[Image:Offline links.pdf]]": output from the planner program

Offline Computing Project Management

2009-11-19T20:34:36Z

new page, a few links

New page

* [[Planner views]]
* [http://halldweb1.jlab.org/planning/offline_links.html Costs]
* [[Steps for Offline Activities, 12 Gev Project]]

Offline Software

2009-11-19T20:31:15Z

/* GlueX Offline Software */

Revision as of 20:31, 19 November 2009		Current revision
Line 49:		Line 49:
	* [[Needed Studies]]		* [[Needed Studies]]
	* [[Role of the Software Coordinator]]		* [[Role of the Software Coordinator]]
-	* [[Steps for Project Offline Activities]]	+	* [[Offline Computing Project Management]]

	==External Software Systems==		==External Software Systems==

November 20, 2009 CDC Meeting

2009-11-19T20:22:17Z

Revision as of 20:22, 19 November 2009		Current revision
Line 18:		Line 18:
	* Review Slava HV board mounting [[http://www.jlab.org/~vgr/CDC%2011-10-2009/]]		* Review Slava HV board mounting [[http://www.jlab.org/~vgr/CDC%2011-10-2009/]]
	* Straw testing		* Straw testing
		+	* Polycarbonate machining

	==New Action Items==		==New Action Items==
Line 25:		Line 26:
	* Slava to layout new setup to attach one connector stud to al plate and attach HV board directly to connector. will relocate connectors and check clearances with 8mm bend rad in wire		* Slava to layout new setup to attach one connector stud to al plate and attach HV board directly to connector. will relocate connectors and check clearances with 8mm bend rad in wire
	* Tim to pursue Medelec 2 piece crimp pin quotes. Medelec said they could not make the one designed		* Tim to pursue Medelec 2 piece crimp pin quotes. Medelec said they could not make the one designed
-	** Medelec will not make any more copper crimp pins of any design unless the order had already been placed. Tim Investigated other manufacturers to no avail. Hole/length ratio too small	+	**<font color=blue> Medelec will not make any more copper crimp pins of any design unless the order had already been placed. Tim Investigated other manufacturers to no avail. Hole/length ratio too small
	* Beni to complete rad tests of straws in the next couple of weeks and send straws back to CMU for test		* Beni to complete rad tests of straws in the next couple of weeks and send straws back to CMU for test
-	** straws back at CMU	+	**<font color=blue>s traws back at CMU
	* Have endplates delivered to JLAB for spot check of hole coordinates. Tim to arrange with survey group		* Have endplates delivered to JLAB for spot check of hole coordinates. Tim to arrange with survey group
-	** Vendor to independently check with Faro arm. Do we still widh to bring these to JLAB?	+	**<font color=blue> Vendor to independently check with Faro arm. Do we still widh to bring these to JLAB?
	* Fernando to look at stripping tools to reduce the need for large pcb on connector		* Fernando to look at stripping tools to reduce the need for large pcb on connector
	**<font color=blue> Stripping tool located, inner pad 3mm, 2mm gap , HV outer pad 6mm. Total wdth of pcb 30.5mm, 8mm bend rad required for cable</font>		**<font color=blue> Stripping tool located, inner pad 3mm, 2mm gap , HV outer pad 6mm. Total wdth of pcb 30.5mm, 8mm bend rad required for cable</font>
Line 35:		Line 36:
	# O-ring: The O-ring used on the prototype is a #103 BUNA-N Soft. The through-hole is 156 and the shoulder is a 9/32 into which the O-ring is forced.		# O-ring: The O-ring used on the prototype is a #103 BUNA-N Soft. The through-hole is 156 and the shoulder is a 9/32 into which the O-ring is forced.
	# Small modifications to connector/grounding assembly [[Image:CDC Connector.pdf]]		# Small modifications to connector/grounding assembly [[Image:CDC Connector.pdf]]
-	* Slava will layout Fernando's stud grounding option
-	**<font color=blue> Opted for connector to al plate standoff stud design</font>
-	* Gary to supply sketch of CMU grounding option
-	**<font color=blue> see below</font>
	* Gary to check if he can still get conductive rubber boot used previously		* Gary to check if he can still get conductive rubber boot used previously
	* Slava to update layout of cable to crimp pin per discussion		* Slava to update layout of cable to crimp pin per discussion
-	* Tim to see if cable restraint bushing can be made
-	* What needs to be done on al plate to ensure electrical connection? all
-	**<font color=blue> Decided on local cleaning and prep during assy</font>
-	* Gary to get sample of polycarbonate to test
-
-	==Ground HV Card Through Standoff==
-	Attached is a rough sketch showing the proposed stand-off scheme. [[Image:Standoff.pdf\| pdf file]]
-	#) A 6/32 blind threaded hole is drilled in the endplate.
-	#) A 6/32 set screw is screwed into the hole. We can use conducting epoxy to improve the connection if needed.
-	#) A 1/4 inch electrical standoff with a 6/32 tapped hole is screwed onto the set screw. There are three possible variations on this for the end in contact with the endplate.
-	##) There is room for the 1/4 inch, nothing specicial
-	##) There is not quite enough room for the 1/4 inch due to the heads of the feedthrus extending 1/10" above the surface of the plate. We can order a standard 1/4 standoff that has a diameter of 188 for the last .133 inches. This comes from McMaster-Carr.
-	##) Or we can make in house modifications:
-	###) we can (in house as needed) taper the end of the standof down to ~188 from 250 so it will fit,
-	###) we can (in house) as needed remove some material from the head of the feed throughs so that the 1/4 in can reach the endplate.
-	#) A .156 inch hole is drilled through the lucite plate.
-	#) A 6/32 set screw goes through the lucite plate and screws into the standoff.
-	#) Epoxy, or conducting epoxy in placed around the 6/32 set screw.
-	#) A 1/4 inch electrical standoff with blind 6/32 holes is screwed
-	#) The connector is attached to the standoff.
-
-	==Mounting the HV card==
-	We also would like to propose the standoffs that hold the HV card be on opposite sides of the card, rather than both on the same side. This gives less chance that the card will tilt during installation and removal.<br>
-	@=== High-voltage board<br>
-	O Standoff/set screw of installation/removal.<br>
-
-	O
-	@=============================@
-	O

Tracking Meetings

2009-11-19T20:15:46Z

/* CDC Meetings in 2009 */

Revision as of 20:15, 19 November 2009		Current revision
Line 36:		Line 36:
	== CDC Meetings in 2009 ==		== CDC Meetings in 2009 ==
	<table><tr><td width=250>		<table><tr><td width=250>
-	* [[Talk:September 30, 2009 CDC Meeting]]
	* [[November 20, 2009 CDC Meeting]]		* [[November 20, 2009 CDC Meeting]]
	* [[October 12, 2009 CDC Meeting]]		* [[October 12, 2009 CDC Meeting]]

November 20, 2009 CDC Meeting

2009-11-19T20:15:30Z

New page

== Meeting Time and Place ==

Friday November 20, 2009 at 10:30am
At Jefferson Lab, the meeting will be held in room ARC 428

== Connections ==
To connect from the outside, please use ESNET 
1.) ESNET: 8542553 
2.) Phone: 
+1-800-377-8846 : US 
+1-888-276-7715 : Canada 
+1-302-709-8424 : International 
then enter participant code: 77438230# (remember the "#") 

== Agenda ==
* Discuss Crimp pin design and manufacture
* Review spacer tube sealing
* Review Slava HV board mounting [[http://www.jlab.org/~vgr/CDC%2011-10-2009/]]
* Straw testing

==New Action Items==

==Action Items/Decisions from Previous Meeting==
* Slava to layout new setup to attach one connector stud to al plate and attach HV board directly to connector. will relocate connectors and check clearances with 8mm bend rad in wire
* Tim to pursue Medelec 2 piece crimp pin quotes. Medelec said they could not make the one designed
** Medelec will not make any more copper crimp pins of any design unless the order had already been placed. Tim Investigated other manufacturers to no avail. Hole/length ratio too small
* Beni to complete rad tests of straws in the next couple of weeks and send straws back to CMU for test
** straws back at CMU
* Have endplates delivered to JLAB for spot check of hole coordinates. Tim to arrange with survey group
** Vendor to independently check with Faro arm. Do we still widh to bring these to JLAB?
* Fernando to look at stripping tools to reduce the need for large pcb on connector
** Stripping tool located, inner pad 3mm, 2mm gap , HV outer pad 6mm. Total wdth of pcb 30.5mm, 8mm bend rad required for cable
== Notes ==
# O-ring: The O-ring used on the prototype is a #103 BUNA-N Soft. The through-hole is 156 and the shoulder is a 9/32 into which the O-ring is forced.
# Small modifications to connector/grounding assembly [[Image:CDC Connector.pdf]]
* Slava will layout Fernando's stud grounding option
** Opted for connector to al plate standoff stud design
* Gary to supply sketch of CMU grounding option
** see below
* Gary to check if he can still get conductive rubber boot used previously
* Slava to update layout of cable to crimp pin per discussion
* Tim to see if cable restraint bushing can be made
* What needs to be done on al plate to ensure electrical connection? all
** Decided on local cleaning and prep during assy
* Gary to get sample of polycarbonate to test

==Ground HV Card Through Standoff==
Attached is a rough sketch showing the proposed stand-off scheme. [[Image:Standoff.pdf| pdf file]]
#) A 6/32 blind threaded hole is drilled in the endplate.
#) A 6/32 set screw is screwed into the hole. We can use conducting epoxy to improve the connection if needed.
#) A 1/4 inch electrical standoff with a 6/32 tapped hole is screwed onto the set screw. There are three possible variations on this for the end in contact with the endplate.
##) There is room for the 1/4 inch, nothing specicial
##) There is not quite enough room for the 1/4 inch due to the heads of the feedthrus extending 1/10" above the surface of the plate. We can order a standard 1/4 standoff that has a diameter of 188 for the last .133 inches. This comes from McMaster-Carr.
##) Or we can make in house modifications:
###) we can (in house as needed) taper the end of the standof down to ~188 from 250 so it will fit,
###) we can (in house) as needed remove some material from the head of the feed throughs so that the 1/4 in can reach the endplate.
#) A .156 inch hole is drilled through the lucite plate.
#) A 6/32 set screw goes through the lucite plate and screws into the standoff.
#) Epoxy, or conducting epoxy in placed around the 6/32 set screw.
#) A 1/4 inch electrical standoff with blind 6/32 holes is screwed
#) The connector is attached to the standoff.

==Mounting the HV card==
We also would like to propose the standoffs that hold the HV card be on opposite sides of the card, rather than both on the same side. This gives less chance that the card will tilt during installation and removal. 
@=== High-voltage board 
O Standoff/set screw of installation/removal. 

O
@=============================@
O

Tracking Meetings

2009-11-19T20:14:59Z

/* CDC Meetings in 2009 */

Revision as of 20:14, 19 November 2009		Current revision
Line 36:		Line 36:
	== CDC Meetings in 2009 ==		== CDC Meetings in 2009 ==
	<table><tr><td width=250>		<table><tr><td width=250>
		+	* [[Talk:September 30, 2009 CDC Meeting]]
		+	* [[November 20, 2009 CDC Meeting]]
	* [[October 12, 2009 CDC Meeting]]		* [[October 12, 2009 CDC Meeting]]
	</td><td width=250>		</td><td width=250>

Talk:September 30, 2009 CDC Meeting

2009-11-19T20:08:33Z

New page

Minutes-11-19-2009

2009-11-19T19:46:56Z

New page

FDC Weekly Meeting

Date: November 19, 2009

Participants: Daniel, Mark S., Beni, Bill, Casey, Simon, Mark I., Eugene, Glenn, Brian

Next Meeting: November 26, 2009 @ 1:30 a.m.
-----------------------------------------------------------------------
==General Construction Updates==
- We are still battling with leak isses associated with the gas spacers.
We have two different versions. One uses a harder o-ring (50 durometer)
and the other a softer o-ring (8 durometer) built up with an 8-mil tape
shim down in the o-ring trough. On frame P1, which is installed in the
single-layer prototype, it also has a few gas leaks up through the vias on
one protion of the STB. Casey has attempt to seal these up. Given also
that the spacer ring must pass across signal traces that stick up by 3 to
4 mils (!), it may be that we will just have to do the best we can and make
do. But there has got to be a better design solution so that we are not
forced to battle a leaky chamber until the end of time.
- Fernando has completed his test plan on the single layer prototype using
a single anode preamp board and a single cathode preamp board, both
stuffed with the new GAS-II preamps. He is preparing a write-up of his
results that will be distributed soon. Fernando did not encounter any
surprises and all seemed to follow expectations (chamber and preamp boards).
As a quick summary, the signal-to-noise levels on the cathode strip signals
were about 20 to 1. This is likely due to the jury-rigged readout connection
and use of an oscilloscope that was known to generate significant EMF.
Firmer numbers will be extracted at a later time. It looked like the
performance of the long wires and the short wires was very similar. Same for
the long cathode strips and the short cathode strips.
- A comparison of the single-layer FDC prototype in a horizontal vs. a
vertical configuration revealed no obvious differences in performance.
This is good news as a sizeable portion of our test plan calls for using
cosmic rays with the chamber in a horizontal orientation.
- The issue with the voltage differences between the full-scale prototype
and the small-scale prototype has been fully resolved. We took a sense
wire sample from a small-scale prototype wire plane and measured its
diameter to be 25 um. We have 20 um diameter wire in the full-scale
prototype. This size difference explains the different plateau voltages.
DSC verified this with GARFIELD calculations of the chamber gain.
- It turns out that only a portion of the production wire order for the FDC
and CDC has arrived. 4 spools of 20 um W wire and 4 spools of 80 um Cu-Be
wire. Each spool holds 1000 m. DSC and Bill met with the SEM folks for an
information exchange meeting. We prepared a set of testing instructions and
circulated it to Curtis and Eugene. It has been turned over to the SEM folks
who are working on a quote.
- The plan for the next several days is to add the second layer to the
prototype. The system will be leak checked and HV checks will be performed.
We will spot check some of the wire and cathode signals to be sure that
there are no gross differences with what we have already seen. We expect
to be ready to add the third layer after that.
- The parts n' pieces for the third full-scale prototype layer will not be
ready until after Thanksgiving unless Mark and Casey can finish cathode
preparations and cathode to wire frame lamination next week. The plan is
to have the full-scale prototype assembly completed by December 4.
- The preliminary FDC stack assembly document draft is located at:
/u/group/halld/Engineering/PRELIMINARY DOCUMENTS. The document will
continue to be fleshed out during the assembly procedure for the
full-scale prototype. We will have to add steps in our construction plans
for leak checking.

==Wire Frame Update==
- Wire frame P4 has completed its electrical QA check after several minor
repairs associated with soldering problems with the preamp connectors.
The components and regions that gave us HV breakdown problems on P1 have
been potted in Humaseal. Wire frame P3 will then follow.
- Wire frame P4 has been laminated to its associated cathode (that is part
of a cathode sandwich). This frame structure is ready for inclusion as
part of the second layer of the stack.
- We need to have a dedicated meeting to design what the schedule for
work on the Phase 3 wire winding will be. The highest priority for
work scheduling will be doing work on upgrades of the wire winding
facility. This includes a better strongback design, the design and
construction of precision combs, modification to the wire winding
table, and a list of other items with the system. Stay tuned, more
to come.
- The wire frame construction document is located at:
/u/group/halld/Engineering/PRELIMINARY DOCUMENTS. He will include
the information on the wire electroplating process as well.
- The parts of the jig to use for the wire electroplating operation
are in our hands. They will be assembled as we find time.
- We need to prepare a document for the electrical QA of the preamp
connectors on the wire boards.
- DSC, Bill, and Fernando will plan a meeting to go over the circuit
board design work for Kim.
- Kim is following up with the contacts obtained from Peter Monaghan
regarding large-area PCBs. Kim is still in back and forth with the
board house and the board material supplier. The outlook may be rosier
than it was a few years ago. Stay tuned.

==Cathode Update==
- Progress updates:
* Casey has been working on soldering rigid-flex assemblies to the
second of our two cathode sandwiches. Soldering work on the first
sandwich has been completed and electrical QA checks are done.
* Even though we are nearly done with the soldering of the rigid-flex
assemblies, we ordered another stencil and will use it for the
remaining soldering work.
* The conducting epoxy used to attach the cathode board grounds between
the three cathode boards that make up a single panel were starting
to peel off. Casey has improved the design using copper tape.
- The current draft of the cathode construction document is located at:
/u/group/halld/Engineering/PRELIMINARY DOCUMENTS.
- We need to prepare a document for QA/stuffing/cleaning for the cathode
boards and a similar document for the cathode daughter boards and ground
boards.

==Preamplifier Boards==
- An order for more ASIC chips is expected very shortly. Fernando expects
that we will have ~40 boards ready by the end of November.

==Cosmic Ray Test Stand==
- Several meetings ago we focussed on the wiggles seen in the reconstructed
wire position from the cathodes (see [http://www.jlab.org/htbin/PHYSICS/halld/enote112.pl?nb=notebook&action=view&page=419 log entry 419]) in the
FDC logbook. We believe that the periodicity seen is due to the algorithm
Beni is using to determine the U and V centroids. Beni get back to this
soon. Stay tuned.

==Work List==
- The FDC short-term work list has been posted on the [http://www.jlab.org/Hall-D/detector/fdc/ FDC web site].
This is continually being updated and DSC welcomes any feedback or
comments from the group.

Minutes prepared by Daniel. Send any comments or corrections along.

Special:Log/upload

2009-11-19T17:34:36Z

uploaded "[[Image:Lamina-thick-notused.jpg]]"

Cut open straws

2009-11-19T17:33:30Z

Revision as of 17:33, 19 November 2009		Current revision
Line 27:		Line 27:
	\|width="415pt"\|[[Image:Lamina-thick-irr.jpg\|thumb\|none\|400px\|Lamina-thick straw irradiated.]]		\|width="415pt"\|[[Image:Lamina-thick-irr.jpg\|thumb\|none\|400px\|Lamina-thick straw irradiated.]]
	\|width="415pt"\|[[Image:Lamina-thick-notirr.jpg\|thumb\|none\|400px\|Lamina-thick straw not irradiated.]]		\|width="415pt"\|[[Image:Lamina-thick-notirr.jpg\|thumb\|none\|400px\|Lamina-thick straw not irradiated.]]
		+	\|width="415pt"\|[[Image:Lamina-thick-notused.jpg\|thumb\|none\|400px\|Lamina-thick straw - not irradiated.]]
	\|-		\|-
	\|}		\|}

BCAL Readout

2009-11-19T04:36:48Z

/* Agenda/Minutes By Date */

Revision as of 04:36, 19 November 2009		Current revision
Line 1:		Line 1:
	== Agenda/Minutes By Date ==		== Agenda/Minutes By Date ==

-	* [[Nov 19, 2009 Readout]]	+	* [[Nov 19, 2009 Readout]] Cancelled
	* [[Oct 22, 2009 Readout]] Cancelled due to Bcal Readiness Review at Regina		* [[Oct 22, 2009 Readout]] Cancelled due to Bcal Readiness Review at Regina
	* [[Oct 22, 2009 Readout]]		* [[Oct 22, 2009 Readout]]

November 23, 2009 (11AM), Physics Working Group

2009-11-18T22:08:08Z

New page

== Connect Information ==

ESNET and EVO will be available:

1. ESNET: 85-42553 (85-HALLD)

2. An EVO room under GlueX will be reserved

== Agenda ==

Physics Working Group Meetings

2009-11-18T22:07:31Z

/* Meetings in 2009 */

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	== Meetings in 2009 ==		== Meetings in 2009 ==

		+	* [[November 23, 2009 (11AM), Physics Working Group]]
	* work done by Pawel (10/26/2009): [[Image:eta-sim-at-gluex-prot.pdf]]		* work done by Pawel (10/26/2009): [[Image:eta-sim-at-gluex-prot.pdf]]
	* [[October 12, 2009 (11:15AM), Physics Working Group]]		* [[October 12, 2009 (11:15AM), Physics Working Group]]

Action Items From Hall-D Software Meetings

2009-11-18T20:15:18Z

add 11/17 items

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	This is a cumulative Action item list from Hall-D software meetings. Items are added as a result of discussion at the bi-weekly software meetings and are marked off as they are completed.		This is a cumulative Action item list from Hall-D software meetings. Items are added as a result of discussion at the bi-weekly software meetings and are marked off as they are completed.
		+
		+	=== [[GlueX Offline Meeting, November 17, 2009\|November 17, 2009]] ===
		+	# Note the no-warning policy in the coding conventions.
		+	# Put the coding standards into version control system.
		+	----

	=== [[GlueX Offline Meeting, November 4, 2009\|November 4, 2009]] ===		=== [[GlueX Offline Meeting, November 4, 2009\|November 4, 2009]] ===

GlueX Offline Meeting, November 17, 2009

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/* Minutes */ first draft

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	=Minutes=		=Minutes=

-	aram david simon sasha craig mark	+	'''CMU''': Curtis Meyer<br>
-	matt	+	'''IU''': Matt Shepherd<br>
-	curtis	+	'''JLab''': Craig Bookwalter, Mark Ito (chair), David Lawrence, Sascha Somov, Simon Taylor, Aram Teymurazyan

-	euguene gave suggestion parmamtetrize in phi, keep map in r-z	+	==Review of the Minutes from the Last Meeting==
-	drop parametrization for now	+

-	coding suggestions incorporated	+	We went over the [[GlueX Offline Meeting, November 4, 2009#Minutes\|minutes of the meeting on November 4]]. David mentioned that he did get a suggestion from Eugene Chudakov on how he might approach a parametrization of a three-dimensional magnetic field.
-	virtual destructors, compilers do not give errors, left it in	+

-	dave will send mail saying that	+	==Next Action on Coding Rules==

-	warning-free code policy of collaboration	+	David reported that he incorporated all suggestions made at the last meeting, with the exception of the suggestion to drop the "virtual destructor" rule. He could not generate a compiler error when the rule is violated, and so the rule has been retained.
		+
		+	We decided to vote on formal adoption of the rules at the next meeting. David will write to the email list announcing this.
		+
		+	==Warning-Free Code Policy==
		+
		+	Craig proposed that we make it a policy that code build without warnings. There was some discussion:
		+
		+	* David noted that when the code is tried on a new platform, warnings may arise. Often the original developer will have difficulty getting access to the new platform, a complication if warning-free code is the policy. We thought that if a good-faith effort is made in these cases the collaboration would be satisfied.
		+	* There may be cases where the warnings on some platforms require a substantial amount of effort to fix while causing no real problem in code excecution. Mark thought that in those cases, an exception to the policy could be made. This would have to be noted in the comments inside the code. This addresses the concern in the previous bullet (to some extent).
		+
		+	With these caveats in mind, we adopted the policy.
		+
		+	==Action Item Review==
		+
		+	We went over the [[Action Items From Hall-D Software Meetings\|list]].
		+
		+	* Mark promised to present the new "Offline Computing" project plan at the next meeting.
		+	* Richard has promised to give us a presentation on the OSG soon.
		+	* There were several items that need to the crossed off the list.
		+
		+	==New Action Items==
		+
		+	# Note the no-warning policy in the coding conventions.

Time-of-Flight/Start-Counter/Target Meeting, November 13, 2009

2009-11-18T16:10:35Z

/* Minutes */ add link

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	* A 4 ns delay cable is being used on the Phillips discrimintor as suggested by Beni Zihlmann.		* A 4 ns delay cable is being used on the Phillips discrimintor as suggested by Beni Zihlmann.
	* With the new set-up he is seeing 100 ps resolution on the time difference. This is to be compared with the 124 ns he saw with the CAEN VME discriminator.		* With the new set-up he is seeing 100 ps resolution on the time difference. This is to be compared with the 124 ns he saw with the CAEN VME discriminator.
-	* He is now running cosmic tests with an Ortec CF 8000??? discriminator.	+	* He is now running cosmic tests with an [http://www.ortec-online.com/electronics/disc/cf8000.htm Ortec CF8000 discriminator].
	* No time walk corrections have been applied to any of the tests so far.		* No time walk corrections have been applied to any of the tests so far.
	* Sascha S. raised the possibility that rate considerations might argue for leading-edge discriminators. David pointed out that with a time-walk corrections, the leading-edge discriminator might do as well in offline reconstruction as a constant-fraction model.		* Sascha S. raised the possibility that rate considerations might argue for leading-edge discriminators. David pointed out that with a time-walk corrections, the leading-edge discriminator might do as well in offline reconstruction as a constant-fraction model.
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	* The version in HDGeant presently is pretty close to Werner’s latest thinking.		* The version in HDGeant presently is pretty close to Werner’s latest thinking.
	* Essential features of the current design are 40 sectors, 2 cm diameter opening for beam in forward direction.		* Essential features of the current design are 40 sectors, 2 cm diameter opening for beam in forward direction.
-	* Need a way to align HDGeant and Tim’s/Chuck’s (I-DEAS???) drawings	+	* Need a way to align HDGeant and Tim’s/Chuck’s (I-deas) drawings
	* Need to establish an authority for changing the geometry of the target. Some start counter design considerations might depend on the possibility of changing target geometry choices.		* Need to establish an authority for changing the geometry of the target. Some start counter design considerations might depend on the possibility of changing target geometry choices.

-	Probably the easiest way to keep things in alignment would be if Werner could interface with both Tim/Chuck (on the I-Deas??? side) and Sascha S. (on the HDDS side).	+	Probably the easiest way to keep things in alignment would be if Werner could interface with both Tim/Chuck (on the I-deas side) and Sascha S. (on the HDDS side).

	==Target Status==		==Target Status==

Special:Log/upload

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Cut open straws

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