Report on special ATF2 meeting held to

1
Report on special ATF2 meeting held to kick-off
France participation in ATF2.Held at LAPP,
Annecy, France 9-11 Oct 2006

• Cherrill Spencer, SLAC
• Member of ATF2 Magnet Team

2
Purpose and main topics of meeting

• The purpose of this meeting is to discuss the
  participation in the ATF2 project of the three
  IN2P3 groups at LAL-Orsay, LAPP-Annecy and
  LLR-Polytechnique, following approval and initial
  funding by the newly created French research
  funding agency ANR (Agence Nationale de la
  Recherche).
• The topics covered are
• beam tuning/optimization and participation in the
  commissioning,
• GEANT4 modeling of the beam line and simulations
  to estimate backgrounds from beam losses,
• support and active stabilization of the final
  doublet and equipment,
• related beam instrumentation,
• porting of results to the final focus of a
  linear collider and analysis of impact.
• The meeting agenda will revolve around these
  topics to review the current activities and
  status in each, and help orient and integrate the
  starting IN2P3 effort.
• ALL TALKS in the 3 day meeting CAN BE FOUND HERE
  
• http//ilcagenda.cern.ch/conferenceDisplay.p
  y?confId1176
• This report concentrates on the magnets for the
  final doublet region.

3
Main participants in the meeting.Plus 6 others
by phone or in person

• Andrea Jeremie (LAPP)
• Philip Bambade (Orsay)
• T. Tauchi (KEK)
• J. Urakawa (KEK)
• R. Sugahara (KEK)
• T. Kume (KEK)
• James Jones (ASTEC, UK)
• Frank Zimmerman (CERN)
• Cherrill Spencer (SLAC)

4
Most of the visitors at the meeting (another good
French dinner)
5
A French way of cooking meat(we need chopsticks
they said!)
6
View of lake Annecy and lower Alps from LAPP
conference room
7
13th century prison in old Annecy
8
CLIC table on loan to LAPP
9
Special foot of the stabilization table this is
the active part
10
Suggested spacing of 2 quads 2 sextupoles on
special CLIC table 26 Sept 06
NOTE 450mm is QD0 core length. Overall length
546.1mm. BPM fits at one end only. At other end
coils, fittings terminals stick out 72.5mm.
FD quads, QD0, QF1 using old FFTB quad QC-3
style.
Quad bore value under discussion- will be less
than 60mm
Sextupoles being designed. Bore ?
11
Suggested spacing of 2 quads 2 sextupoles on
special CLIC table 26 Sept 06
NOTE 450mm is QD0 core length. Overall length
546.1mm. BPM fits at one end only. At other end
coils, fittings terminals stick out 72.5mm.
FD quads, QD0, QF1 using old FFTB quad QC-3
style.
Quad bore value under discussion- will be less
than 60mm
Sextupoles being designed. Bore ?
12
Close-up of QC3 Mover showing LVDT parts not
shown on installation drawings
LVDTLinear Variable Differential Transformer
These 3 position sensors and their supports, not
shown on main installation drawing.
13
New Magnets Being Made for the ATF2 part 2/4

• Two final doublet quads QD0, QF1,being
  fabricated by enlarging bore of 2 existing quads
  of the FFTB QC-3 style.
• Remaining question Id like agreement on today
  size of enlarged bore. As explained in my Monday
  9th October talk Id like to make new bore 49mm
  in diameter.
• Will work on disassembly, EDMing poletips,
  re-assembly and magnetic measurements between now
  and March 2007.

14
New Magnets Being Made for the ATF2 part 3/4

• Five new sextupoles are needed 3 in the FF SD4,
  SF5 and SF6 and 2 in the final doublet
  (interleaved with final 2 quads) SF1 and SD0.
• Considerations of available Z space and height of
  ATF2 beam lead us to make new and different
  designs for the FF and FD sextupoles.
• SF1 SD0
• will have (large) S-band BPMs attached to their
  core
• their bore should match the QD0/QF1 bore ( 49mm)
• Cores can be somewhat longer than 90mm
• their cores may need to fit in with a wider FFTB
  mover than the QMAG style must put bore at
  1.2m from floor

15
New Magnets Being Made for the ATF2 part 4/4

• FF sextupoles another new design needs to be
  made with these features
• Bore to be same as adjacent QEA quads 32 mm
  diameter
• Coil end shape to be compatible with a C-band BPM
• Core to be 90mm long (OK with a 32 mm bore)
• Bottom of core to be flat, to sit directly on a
  QMAG mover T plate. Distance between core
  bottom and bore center to be 295mm
• Vertical distance between bottom of T plate
  (under a mover) and magnet bore center to be 541
  mm.
• Will be over 7 months from now (at earliest)
  before 5 sextupoles are designed, made and
  measured.

16
Two important questions about the FD magnets for
ATF2 we considered

• Question 1. Will the 4 FD magnets and their S
  band BPMs fit on the CLIC table?- overall length
  is the issue .
• Answer 1. Yes (Okugi analysis of layout).
• Question 2. Can they have FFTB magnet movers
  under them and have centers of their apertures
  match the 1.2m beam height off ATF2 floor?
• Answer 2. A new very short support has been
  designed that fits under the FD quads movers T
  plate and puts bore center at 1.2 m (see Nicolas
  Geffroy presentation this workshop 11 Oct 06)

17
What SLAC equipment LAPP needs to thoroughly test
the CLIC table

• A QC3 quad Spencer is negotiating with SABER
  project group at SLAC who suddenly think they
  might need the 3rd QC3 quad (we know where it is
  stored at SLAC). Could lend it to LAPP until Feb
  2007, maybe longer.
• The QC3-style FFTB mover (wider T plate) to go
  under the borrowed QC3 quad.
• Three other FFTB movers
• Electronics and cables to run the 4 movers
• 2 Streckeisen STS2 sensorsSpencer to enquire
  at SLAC

18
Electronics cables to control FFTB movers. Need
2 crates to control 16 movers
Interface between controller and stepper motors
Back and front of stepper motor resistor chassis
19
New design for wide mover support by N. Geffroy,
LAPP. With two possibilities for height
adjustment

• Use of spacer to adjust magnet height /
  inclination

• Very accurate base plate thickness for desired
  magnet height.

5
20
T-1 plate for QC-3, sits under FFTB mover. We
have only one QC-3 T plate for QF1
609.6 mm WIDE
Need to make at least one more wide T plate for
QD0. If FD sextupoles width demands it will need
2 additional wide T plates for them.
482.6mm LONG
21
Drawings of smaller T-plate that we will be using
under QEAs and FF sextupoles
If need wider movers would make new T plates and
use shafts, stepper motors, LVDTs etc from QMAG
movers to finish the wider mover.
Width 457.2mm
Length 482.6mm
22
Agreed Upon Movement of old FFTB movers

• Send 24 less wide movers their electronics and
  cables to KEK very soon
• Send one wide mover and 3 less wide movers
  their electronics and cables to LAPP very soon
  (John Seeman has to be convinced to lend us a
  spare QC3 for a few months)
• Keep one less wide mover at SLAC
• On 24th October 4 movers crated up for LAPP and
  awaiting shipping documentation