Magnetic shielding meeting: 2012-07-25: 15:30 BST

Present: CMacW, RP, LF, AN, TB, JC, KL, JT, YK

	1.	Actions:
	⁃	MC: Update geometry and add quads;
	⁃	No update.
	⁃	MC: Make prioritised list of items to be added to the magnetic model;
	⁃	No update.
	⁃	AN,KL: How to add effort (perhaps B.Sheppard);
	⁃	In progress.
	⁃	MC: Send transverse forces to mailing list;
	⁃	Stands.  KL to remind MC.
	⁃	RP: Consider moving Twiki to MICE twiki;
	⁃	RP looked at the RAL based Twiki and has begun to set up the new site.
	⁃	MC: Draft person specification for "new team member";
	⁃	Stands. KL to remind.
	⁃	MC: Recheck assumptions that underlie the local magnetic shielding quote;
	⁃	Stands.  KL to remind.
	⁃	JT/MC: evaluate cost and complexity of shielding compressors at south wall
	⁃	Stands.  Is part of the previous action.
	⁃	JT/IM: Evaluate cost and complexity of shielding compressors at west wall
	⁃	Believe that there is no shielding requirement on the West Wall.  Would require racking and modification to the stairs.  JT is working on this.  IM is working on the electrical installation requirements.
	⁃	MC: evaluate effect of racks on field in RF area
	⁃	Stands. KL to remind.
	⁃	RP/AG: evaluate the installation of the RF amplifier
	⁃	No report this week -- stands.
	⁃	LF/MOM: produce list of components, responsible people, and status list for next week;
	⁃	List of small and large components is now available.  This includes what is in the trench.  Now need to categorise this into sheets by system.  WIll circulate the list once it has been divided into categories;
	⁃	TH, JT, IM, MC, AG, RP: Write paper for presentation to the TB for positioning of the racks behind north wall;
	⁃	No started.  RP volunteers TH as lead author for this paper.  RP to start the drafting.  KL to provide section headings.
	⁃	JT: Send transverse projection of experiment to JC;
	⁃	Done.
	⁃	JC: Review transverse section and send comments to this group and HW	
	⁃	Stands…JC has started to consider the issue.  JC's opinion is that it could be possible that some return iron could be added.  Discussion of issues raised by the drawings including south mezzanine, tracker waveguides.  JC will try and make a sketch and send it to HW.  JC's sketch would also be sent to JT for inclusion in the model.
	2.	Status of review of items in Hall and contacts with system owners:		LF/MOM
	⁃	Status noted above.  Spreadsheet will be circulated to the list for information while the categorisation noted above is carried;
	3.	Status of magnetic model of MICE Hall								MC
	⁃	No report this week.
	⁃	CMacW:
	⁃	PS and CMacW met with V.Bayliss to discuss the magnetic model.  Issues to do with the meshing was discussed.  It was felt that P.Smith should take stock of the model before beginning to run the model to produce more detailed information.
	4.	Discussion of options:											All
	⁃	Racks: 
	⁃	Behind north magnetic shield wall;
	⁃	No new information to report this week;
	⁃	On the mezzanine level to the north east;
	⁃	No new information to report this week--discussion indicated that this space probably should be used.  One natural use of this could be for the compressors for the upstream tracker and the upstream solenoid.
	⁃	CMacW, LF: Look into siting upstream spectrometer solenoids in the north-east mezzanine.
	⁃	IM: define limitations on cabling etc. for the racks for control etc. to inform discussion of revised locations.
	⁃	Compressors:
	⁃	Along west wall;
	⁃	See above.
	⁃	Present scheme, i.e. inside south magnetic shield wall;
	⁃	JT comments that cost of shielding in this area is likely to be £200k-£300k.
	⁃	Local shielding of magnetic field (return yokes):
	⁃	Local shielding of solenoids and FC
	⁃	Drawings etc. will be send to HW and JT by JC as described above.
	⁃	JC: preliminary commented that HW has circulated simulations of 600mm i/d 100mm thick cylinder extending beyond the end of Step IV by 1m at each end.  This reduces field outside the shielding by a factor of 10.  While not practical this indicates that local shielding might become an option.
	⁃	ISIS plant room:
	⁃	Compressors;
	⁃	Racks
	⁃	Both
	⁃	Postpone until other options have been worked through.
	⁃	Igloo:
	⁃	Closure of ends of shield wall
	⁃	Still on hold.
	5.	Exposure of equipment to magnetic field							CMacW,RP
	⁃	CMacW; small permanent tests: CMacW unconvinced about the practicality of the present test scheme without the predictions from better magnetic modelling.  May be able to re-start checks once D.Adey sets up the tracker DAQ again;
	⁃	RP: no progress on exploitation of the ISIS quad.  
	⁃	Implies need to expedite training of PS.
	6.	List of specific items to check									MC
	⁃	 Q9 power supply
	⁃	Control rack for compressors, vacuum etc.
	⁃	Vacuum pumps
	⁃	LF/MOM list has all items that are in the Hall.  Need a separate list of all items that are not in the Hall. Such items will be included in the single list.  When that exists, this agenda item can be removed.
	7.	AoB
	⁃	CR4 is the weekly location.

Summary of actions:
	⁃	MC: Update geometry and add quads;
	⁃	MC: Make prioritised list of items to be added to the magnetic model;
	⁃	AN,KL: How to add effort (perhaps B.Sheppard);
	⁃	MC: Send transverse forces to mailing list;
	⁃	RP: Consider moving Twiki to MICE twiki;
	⁃	MC: Draft person specification for "new team member";
	⁃	MC: Recheck assumptions that underlie the local magnetic shielding quote;
	⁃	JT/MC: evaluate cost and complexity of shielding compressors at south wall
	⁃	JT/IM: Evaluate cost and complexity of shielding compressors at west wall
	⁃	MC: evaluate effect of racks on field in RF area
	⁃	RP/AG: evaluate the installation of the RF amplifier
	⁃	TH, JT, IM, MC, AG, RP: Write paper for presentation to the TB for positioning of the racks behind north wall;
	⁃	JC: Review transverse section and send comments to this group and HW	
	⁃	CMacW, LF: Look into siting upstream spectrometer solenoids in the north-east mezzanine.
	⁃	IM: define limitations on cabling etc. for the racks for control etc. to inform discussion of revised locations.