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

Conference Room 4, R1

Present: LF, TH, CMacW, PH, JT, KL, PS, AG, JW, IM, JC

**** We agree to start in future at 15:00 ****

	1.	Actions:
	⁃	MC: Update geometry and add quads;
	⁃	Stands.  
	⁃	MC: Make prioritised list of items to be added to the magnetic model;
	⁃	Stands.
	⁃	AN,KL: How to add effort (perhaps B.Sheppard);
	⁃	KL to talk to Jim Clarke in DL tomorrow.
	⁃	MC: Send transverse forces to mailing list;
	⁃	Stands.
	⁃	RP: Consider moving Twiki to MICE twiki;
	⁃	Done.
	⁃	MC: Draft person specification for "new team member";
	⁃	Stands.
	⁃	MC: Recheck assumptions that underlie the local magnetic shielding quote;
	⁃	Stands.  Transferred to JT.
	⁃	JT/MC: evaluate cost and complexity of shielding compressors at south wall
	⁃	See above.  Transferred to JT.
	⁃	JT/IM: Evaluate cost and complexity of shielding compressors at west wall
	⁃	MC: evaluate effect of racks on field in RF area
	⁃	Stands.  KL to talk to MC;
	⁃	RP/AG: evaluate the installation of the RF amplifier
	⁃	In progress.
	⁃	TH, JT, IM, MC, AG, RP: Write paper for presentation to the TB for positioning of the racks behind north wall;
	⁃	RP has created a first draft.  RP will send to TH.
	⁃	IM has documented a number of issues for the implementation of racks and compressors in the various proposed locations.
	⁃	JC: Review transverse section and send comments to this group and HW
	⁃	Done, see below.
	⁃	CMacW, LF: Look into siting upstream spectrometer solenoids in the north-east mezzanine.
	⁃	Done.
	⁃	IM: define limitations on cabling etc. for the racks for control etc. to inform discussion of revised locations.
	⁃	EMail conversations have been carried out.  Result is that there are no pressing (electrical) cable-length issues.
	2.	Status of review of items in Hall and contacts with system owners:		LF/MOM
	•	Spreadsheet now broken down into sub-system owners in separate tabs.  Some items are not assigned to owners.  Can be posted on the TWiki, LF has passed to Roy to upload.;
	•	KL: Offer that LF should present list to MICO;

	3.	Status of magnetic model of MICE Hall								MC
	⁃	Agenda item is moved to PS;
	⁃	PS has taken model from VB and is beginning to tame the model and to tidy so that he can understand the elements better;
	⁃	PS proposes that CMacW and MC will learn to run OPERA so that details of the model can be checked.  Later this will also benefit the information exchange from the model to those who need to understand the output.

	4.	Discussion of options:											All
	⁃	Racks: 
	⁃	Behind north magnetic shield wall;
	⁃	7 racks drawn behind the north shield wall;
	⁃	Paper prepared for the Technical Board;
	⁃	Goa complete the paper in two weeks and pass to TB;
	⁃	On the mezzanine level to the north east;
	⁃	Compressors:
	⁃	Along west wall;
	⁃	LF and CMacW measured cable routing to west wall which looks reasonably favourable.  Expect that the length of the run can be less than 30m.  This seems to indicate the west wall is a possible solution;
	⁃	Present scheme, i.e. inside south magnetic shield wall;
	⁃	On hold until the shielding quote has been returned;
	⁃	Local shielding of magnetic field (return yokes):
	⁃	Local shielding of solenoids and FC
	⁃	JC:
	⁃	JT's cross section of channel was sent to H.Witte with copy to JT.  There is a phone meeting on Friday afternoon to discuss the issue;
	⁃	PH:
	⁃	See slides;
	⁃	Agree that PH will partner with H.Witte.
	⁃	ISIS plant room:
	⁃	Compressors;
	⁃	Racks;
	⁃	Both;
	⁃	Postpone until other options have been worked through.
	⁃	North-east corner:
	⁃	CMacW and LF checked length of run to NE corner.  Worst case, the length of the hose run will be 34m.  This is a problem as it takes the Sumitomo cryocooler beyond the companies safe limit;
	⁃	In addition, need to service two regions with electricity, water, and air;
	⁃	Conclude:
	⁃	North-east option is dis-favoured.
	⁃	Igloo:
	⁃	Closure of ends of shield wall
	⁃	Still on hold.
	⁃	
	5.	Exposure of equipment to magnetic field							CMacW,RP
	⁃	CMacW: RP has some ideas for how to measure equipment.  For the moment it is not the top priority;
	⁃	CMacW: Will look into companies that could help us develop solutions to magnetic testing;

	6.	List of specific items to check									MC
	⁃	 Q9 power supply
	⁃	HV rack
	⁃	Control rack for compressors, vacuum etc.
	⁃	Vacuum pumps
	⁃	Substation:
	⁃	IM: Check content and limit on operation of the substation;
	⁃	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
	⁃	PH: Tracker electronics;
	⁃	Consider splitting tracker rack into smaller pieces;
	⁃	Also, consider design of buffer board for VLSB so that elements of the tracker rack can be removed;

Summary of actions: