From: Kenneth Long <k.long@imperial.ac.uk>
Subject: Notes from our meeting ...
Date: 4 July 2012 17:27:59 GMT+01:00
To: Cobb John <j.cobb1@physics.ox.ac.uk>, Hanlet Pierrick <hanlet@fnal.gov>, Mullacrane Ian <i.d.mullacrane@dl.ac.uk>, Fry Luke <Luke.Fry@stfc.ac.uk>, Bross Alan <bross@fnal.gov>, "<craig.macwaters@stfc.ac.uk> Macwaters Craig (STFC RAL" <craig.macwaters@stfc.ac.uk>, Hayler Tim <T.M.Hayler@rl.ac.uk>, Nichols Andy <andy.nichols@stfc.ac.uk>, Preece Roy <roy.preece@stfc.ac.uk>, Mike Courthold <mike.courthold@stfc.ac.uk>, Bayliss Victoria <victoria.bayliss@stfc.ac.uk>, Tarrant Jason <jason.tarrant@stfc.ac.uk>, Greenall Stewart <stewart.greenall@stfc.ac.uk>, Smith Paul <P.J.Smith@sheffield.ac.uk>

Notes on our meeting follow.  Next meeting next week: Wednesday 15:30.

K

- 15:30 (BST) Notes on magnetic field meeting: 04Jul12:
 -----------------------------------------------------
 Present: IM, CW, JW, PS, ABr, KL, AG, MC, CMacW, VB, TH, RP, JC

1. Status of magnetic model of Hall                        -- VB/MC
  - Model of quads was built in inventor which does not directly
    go into Vector Fields.  With update to software, need to move
    Vector Fields native format for the geometry.  Expect this to
    take a week or two.  Also, as the updated model is built will
    check information is correct;

  - Need to support VB in setting up geometry model given pressure
    of other work in this area;

  - MC will work with VB to make the translation to the new format
    for the geometry;

  - It was suggested that a scaling approach to estimating the 
    effect of iron on the field. Advice from VF would be valuable
    in assessing how to do this.

  - ABr reported that PH, ABr met with V.Koshinkin and M.Beuler at
    FNAL.  Similar analysis done for CC test stand at FNAL.  VK
    raised issue of lack of symmetry of the magnetic shield walls.
    Advice was that we need to determine whether the transverse
    loads can be accommodated by the cold-mass supports.

    - JC: comments that he had thought it out for the FC, and that
          his calculation indicated that 25-30 Tonnes could be
          supported;

    - MC: Commented that J.Rochford and H.Witte considered effect of
          non-symmetric forces.  It was not clear whether the
          transverse forces were calculated;

          MC offered to contact JR to check whether the calculations
          could be done.

    - VB: Has forces from VF and will circulate to the mailing list;

  - Actions: 
    - JT    : Provide VB information on quad geometries;
    - AG    : Find information on magnetic stands for input to VB;
    - VB    : Update geometry and add quads;
    - AN, KL: How to add effort (perhaps B.Sheppard);
    - JC    : Will ask if H.Witte might be available to support;
    - VB    : Send transverse forces to mailing list;
    - RP    : Consider how to set up information sharing WWW site;

2. Status of gathering information on list               -- JT, LF
  of magnetic equipment in Hall
  - JT explained that he had not yet been able to discuss with LF to
    see if he was available to support the inventory;

  - MC offers to check lists with LF, JT when list is done;

  - IM offers list of equipment not yet in MICE Hall for
    consideration;

  - Actions:
    - JT, MC: Carry out initial review of present list of magnetic
              items in the Hall;
    - JT    : With AN, make sure whether LF has the bandwidth to 
              support making the list of magnetic material and 
              contacting system owners;
    - RP    : Ask M.Glover about possible use of magnet test bed;
    - KL    : Test plan to go on agenda for next

3. Job description for consultant tender                 -- VB/MC
  - Consider asking N.Marks to support magnetic modelling work;

  - Two classes of support required;
    - First, need advice from VF to help simplify model etc.  MC can
      take this forward;

    - Expert person required to support analysis effort;

  - Actions:
    - IM    : Get N.Marks contact details to KL so that he can be
              asked if he is able to help;
    - MC    : Draft person specification for "new team member";

4. Discussion of options (re-prise, but hope we are brief, noting progress):
  - Compressors on West Wall (upstream compressors in north east);

  - Racks behind north magnetic shield wall where RF amps will be;

  - Some racks in the upper floor to the north east

  - Present scheme for compressors

  - Local return of magnetic field

  - ISIS plant room as a fall-back location for racks and
    compressors;

  - IM: Offers to work with JT to try and lay out racks in an
        appropriate arrangement for Step IV.  

  - Agreed:
    - Try and have an informed conversation next week of a Step IV
      solution with compressors on the West Wall (and to the north
      east); two-stories of racks behind the North Magnetic Shield
      Wall;

    - If we feel this is feasible, then we have two options (the
      second is with the compressors on the south as presently
      envisaged;

  - Actions:
    - MC        : Recheck assumptions that underlie the local
                  magnetic shielding quote;
    - JT, IM, AG: Try to devise a scenario as noted under "Agreed"

5. Summary of actions:
    - JT    : Provide VB information on quad geometries;
    - AG    : Find information on magnetic stands for input to VB;
    - VB    : Update geometry and add quads;
    - AN, KL: How to add effort (perhaps B.Sheppard);
    - JC    : Will ask if H.Witte might be available to support;
    - VB    : Send transverse forces to mailing list;
    - RP    : Consider how to set up information sharing WWW site;
    - JT, MC: Carry out initial review of present list of magnetic
              items in the Hall;
    - JT    : With AN, make sure whether LF has the bandwidth to 
              support making the list of magnetic material and 
              contacting system owners;
    - RP    : Ask M.Glover about possible use of magnet test bed;
    - KL    : Test plan to go on agenda for next
    - IM    : Get N.Marks contact details to KL so that he can be
              asked if he is able to help;
    - MC    : Draft person specification for "new team member";
    - MC        : Recheck assumptions that underlie the local
                  magnetic shielding quote;
    - JT, IM, AG: Try to devise a scenario as noted under "Agreed"

Kenneth Long
    EMail:   K.Long@Imperial.AC.UK      
    Phone:   +44-(0)20-7594-7812      [at RAL: +44-(0)1235-445646]
                                      [at DL : +44-(0)1925-864356]
    Fax:     +44-(0)870-706-0215      [at RAL: +44-(0)1235-446733]
    Mobile:  +44-(0)7890-595-138
    WWW:     http://www.hep.ph.imperial.ac.uk/~longkr/
    Address: Department of Physics
             Blackett Laboratory
             Imperial College London
             Exhibition Road, London, SW7 2AZ

On 4 Jul 2012, at 15:20, Kenneth Long wrote:

Dear all,

15:30 BST.

K

Kenneth Long
   EMail:   K.Long@Imperial.AC.UK      
   Phone:   +44-(0)20-7594-7812      [at RAL: +44-(0)1235-445646]
                                     [at DL : +44-(0)1925-864356]
   Fax:     +44-(0)870-706-0215      [at RAL: +44-(0)1235-446733]
   Mobile:  +44-(0)7890-595-138
   WWW:     http://www.hep.ph.imperial.ac.uk/~longkr/
   Address: Department of Physics
            Blackett Laboratory
            Imperial College London
            Exhibition Road, London, SW7 2AZ

On 4 Jul 2012, at 13:25, John Cobb wrote:

15:30 BST or GMT ? 
jhc
-----Original Message-----
From: Kenneth Long [mailto:k.long@imperial.ac.uk] 
Sent: Wednesday, July 04, 2012 6:27 AM
To: Hanlet Pierrick; Mullacrane Ian; Fry Luke; Bross Alan; 
<craig.macwaters@stfc.ac.uk> (STFC RAL Macwaters Craig; Hayler 
Tim; Nichols Andy; Preece Roy; Mike Courthold; Bayliss 
Victoria; Tarrant Jason; John Cobb; Greenall Stewart; Smith Paul
Subject: Magnetic shielding meeting

Dear All,

My notes on last week's meeting are appended.  

We agreed to meet 15:300 each wednesday ... phone in details are 
attached for today's meeting.

For the agenda I'd like to propose:

1. Status of magnetic model of Hall                            
                                -- VB/MC
2. Status of gathering information on list of magnetic 
equipment in Hall -- JT, LF
3. Job description for consultant tender                       
                              -- VB/MC
4. Discussion of options (re-prise, but hope we are brief, 
noting progress):
- Compressors on West Wall
- Racks behind north magnetic shield wall where RF amps will be
- Some racks in the upper floor to the north east
- Present scheme for compressors
5. AoB/Discussion

K

Kenneth Long
EMail:   K.Long@Imperial.AC.UK      
Phone:   +44-(0)20-7594-7812      [at RAL: +44-(0)1235-445646]
                                  [at DL : +44-(0)1925-864356]
Fax:     +44-(0)870-706-0215      [at RAL: +44-(0)1235-446733]
Mobile:  +44-(0)7890-595-138
WWW:     http://www.hep.ph.imperial.ac.uk/~longkr/
Address: Department of Physics
         Blackett Laboratory
         Imperial College London
         Exhibition Road, London, SW7 2AZ

---------------------------------------------------------------
--------------------------------------
- Notes on magnetic field meeting: 28Jun12:
-----------------------------------------
- Present, RAL: TH, JT, VB, KL, AN, CMacW
        Ggo: JC, MC, PS, PH

1. Outcome of technical board discussion was summarised:
- Parallelise looking at alternatives:
- US will look at shielding field at source by adding a 
  flux return path to the magnets;

- UK will look at options for re-siting equipment in the
  Hall or applying local shielding;

- Develop first a robust Step IV strategy;

- Constraint:
- Solution needs to be developed that preserves as far as
  possible present Step IV schedule;

- Tracker rack have limitted distance from patch-pane to 
cryostat, and cryostat to tracker rack.  Assume, therefore
that tracker equipment must be locally shielded;

- Hall options to study:
- Compressors on West Wall
- Racks behind north magnetic shield wall where RF amps will be
- Some racks in the upper floor to the north east
- Present scheme for compressors

2. Evaluation of field maps from MC              -- JC
- Regions found below 200 G in the vicinity of the North Wall and
the west wall.  VB and MC agreed.

3. We agreed:
- Regular meeting Wednesdays 15:30;
- We need a WWW page, a wiki would be ideal

- Vacuum pumps can be considered in a second pass since it was
felt that the problems were not as accute as for the racks and
compressors;

- Forces on the shield walls and other ferrous objects would be 
revisitted as part of the calculation;

- For options considered would also seek to find the upper limit
on the field that could be tolerated and whether flip/non-flip
both cause the field to be too high;

- Paul Smith will learn the modelling environment and focus on
the tracker-specific issues;

- Magnetic simulation must now become part of design loop

4. Discussion of next steps: agreed actions only:
- Completing the inventory:                         LF, JT
i. Inventory taken to mean large items 
   (e.g. Q9, beam stop) as well as 
   equipment serving detectors);

ii. Feasibility of racks behind North magnetic     VB, MC
   shield wall
   [taken to be of higher priority than compressors]

iii. Feasibility of compressors along west wall     VB, MC

iv. Job spec for consultant effort on modelling    VB, MC

v. Solicit information on SS experience           RP

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