Magnetic shielding meeting: 2012-07-18: 15:30 BST

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

	1.	Actions:
	⁃	VB: Update geometry and add quads;
	⁃	VB no longer working on magnetic modelling.  So, action transferred to MC;
	⁃	AN,KL: How to add effort (perhaps B.Sheppard);
	⁃	Ongoing; discussion now with MARS group leader J. Clarke at DL;
	⁃	VB: Send transverse forces to mailing list;
	⁃	Action transferred to MC;
	⁃	RP: Consider how to set up information sharing WWW site;
	⁃	Done.  Twiki at RAL set up.  Issue with external people solved by using VPN.  Continue to use RAL Twiki, in parallel consider using MICE Twiki.
	⁃	RP: Ask M.Glover about possible use of magnet test bed;
	⁃	Done.
	⁃	IM: Get N.Marks contact details to KL so that he can be asked if he is able to help;
	⁃	Done. Noted above.
	⁃	MC: Draft person specification for "new team member";
	⁃	Stands.
	⁃	MC: Recheck assumptions that underlie the local magnetic shielding quote;
	⁃	Stands.  Waiting for Magnetic Shields to responds.
	⁃	JT/MC: evaluate cost and complexity of shielding compressors at south wall
	⁃	Stands.  Need to get in contact with S. Locker.  Follows on from previous action.
	⁃	JT/IM: Evaluate cost and complexity of shielding compressors at west wall
	⁃	In progress.  IM and JT have studied fitting compressors along the west wall.  Will discuss later.
	⁃	MC: evaluate effect of racks on field in RF area
	⁃	In progress; see below.
	⁃	RP/AG: evaluate the installation of the RF amplifier
	⁃	In progress.
	⁃	LF/MOM: consider possible locations for HV rack for TOFs etc. to be remoted and positions for EMR rack and diffuser rack
	⁃	Have contacted CAEN.  Can guarantee up to 50G, most probably will work up to 100G.  
	⁃	For EMR, can't have cables longer than 15m between detectors and electronics.
	⁃	Agree this should be agenda item.
	⁃	KL: Note Q9 power supply position needs to be revisited.
	⁃	Noted: add to agenda;
	⁃	KL: Note, location of control rack for compressors and vacuum.  Second story north side or put them behind the beam stop
	⁃	Noted: added to agenda
	⁃	KL: Note location of vacuum pumps: is this magnetically blessed;
	⁃	Noted: add to agenda.
	2.	Status of review of items in Hall and contacts with system owners:		LF/MOM
	⁃	Model of all things on the Wall and the small components found in the Hall have been added to the model;
	⁃	Items in the trench not yet accounted for;
	⁃	Now need to contact the system owners.
	⁃	Agreed:
	⁃	LF/MOM: produce list of components, responsible people, and status list for next week;
	3.	Status of magnetic model of MICE Hall								MC
	⁃	Model in a state of flux because VB has made some updates which now need to be completed by MC.  Some revisiting of experts may be required.
	⁃	Agreed:
	⁃	Make living document
	4.	Discussion of options:											All
	⁃	Racks: 
	⁃	Behind north magnetic shield wall;
	⁃	MC:
	⁃	Explained that presently believe that the location behind the north wall is low; 0-5G.  So, working assumption is that this location is suitable for the racks;
	⁃	MC needs to check for distortions of field if ferrous material is added;
	⁃	Consider use of scaffolding to produce mezzanine level;
	⁃	Agreed:
	⁃	Working assumption: racks, except for the tracker racks and perhaps the EMR racks, will be located being the north magnetic shield wall for Step IV only;
	⁃	Actions:
	⁃	MC: Check that when racks are placed behind wall;
	⁃	TH, JT, IM, MC, AG, RP: Write paper for presentation to the TB;
	⁃	Goal for first draft 2 week;
	⁃	On the mezzanine level to the north east;
	⁃	LF: reviewed possibility of placing racks on the second level in the north east corner.  Advantages: use space not ear-marked for other equipment.  Disadvantages: building new structure; supply of power and water;
	⁃	Continue to evaluate as an option;
	⁃	Compressors:
	⁃	Along west wall;
	⁃	IM, JW: For step 4, need to put 19 compressors: stack 10 on the ground floor and 9 on the next level;
	⁃	Need to review re length of cable and high-pressure hoses;
	⁃	JT has discussed making channel in the floor.  Other options have been disused.  Need to continue to evaluate and cost the scheme;
	⁃	Consider "going over the top" for the services;
	⁃	MC: reports that, for Step IV, the compressors can be placed at the West end of the Hall;
	⁃	Requires to move the stairway to north mezzanine;
	⁃	Consider building a structure with scaffolding;
	⁃	Present scheme, i.e. inside south magnetic shield wall;
	⁃	Advantage, preserves existing services; Disadvantages: requires additional shielding.  Could be £15k per cabinet.  That is 19*£15k, i.e. still very expensive.
	⁃	Review this scheme when revised quotes from Magnetic Shields are available;
	⁃	Local shielding of magnetic field (return yokes):
	⁃	Local shielding of solenoids and FC
	⁃	No contribution from FNAL or BNL.
	⁃	JC has contacted H.Witte.  ABr discussed with Bob Palmer who has given permission for HW to take part;
	⁃	JC asks for transverse plot of equipment in Step IV from JT:
	⁃	JT: Send transverse projection of experiment to JC;
	⁃	JC: Review transverse section and send comments to this group and HW
	⁃	ISIS plan room:
	⁃	Compressors;
	⁃	Racks
	⁃	Both
	⁃	Igloo:
	⁃	Closure of ends of shield wall
	⁃	Parked for now
	6.	Exposure of equipment to magnetic field							CMacW,RP
	⁃	RP:
	⁃	ISIS has a quad (as Q4-9) which can be used to test small items in a known field.  A power supply to be fixed up to do this.  S. Ruddle has been asked to fit up the power supply.  Proposal is to test components in fields in air. 
	⁃	CMacW and RP:
	⁃	Have also made investigated effect on the Weiner module of small permanent magnets.  Some increase in noise was observed.  Effect depends on the area over which the power supply was exposed to the magnetic field.
	⁃	Already seem to have identified the fans as a critical item.
	⁃	Work in progress.
	7.	List of specific items to check									MC
	⁃	 Q9 power supply
	⁃	Control rack for compressors vacuum etc.
	⁃	Vacuum pumps
	8.	AoB
	⁃	AG:
	⁃	For Step IV seems to be compressors on west wall and racks behind the north wall.  Additional costs look minimal.  This clearly needs to be studied.

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
	⁃	LF/MOM: produce list of components, responsible people, and status list for next week;
	⁃	MC: Check that when racks are placed behind wall;
	⁃	TH, JT, IM, MC, AG, RP: Write paper for presentation to the TB;
	⁃	JT: Send transverse projection of experiment to JC;
	⁃	JC: Review transverse section and send comments to this group and HW