Download ARIEL E-linac Quadrupoles Preliminary Engineering Designs

ARIEL E-linac Quadrupoles Preliminary Engineering Designs
Rick Baartman
August 8, 2011
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Scope of Supply
DPACE shall prepare preliminary quadrupole magnet designs according to breakdown (Table 1) and attached
TRIUMF design notes. The designs shall be undertaken in a manner which shall likely result in cost savings
to TRIUMF. The designs supplied by D-PACE shall not be exhaustive detailed design notes, but shall capture
the major engineering parameters of each magnet such as basic geometry including yoke and pole dimensions,
general coil layout and composition including maximum dimensions, considerations regarding air versus
water cooling, and supporting calculations sufficient to establish designated peak fields, effective length,
non-saturation, power supply requirements (voltage and current), cooling requirements. It is understood
that the purpose of these designs are to provide enough information for magnet manufacturers to be able to
quote on the magnets while leaving enough leeway for each supplier to achieve the fundamental function of
each magnet using their own techniques.
The work shall be the evaluation of three quadrupole magnet designs (weak, medium and strong) having
different integrated strength, Table 1. A proposal for the basic design style is given in TRI-BN-11-02 and
shall form the basis for the D-PACE consultancy. These three quadrupoles shall have similar (or equal)
yoke lengths measured along the electron beam line, but will differ in terms of current-turns and air or
water cooling and total physical length including coil over hangs. A goal of the design study is to determine
minimum insertion length, anticipated to be ≤ 20 cm.
The “weak” kind will have round cylindrical poles ending in spherical section surface, similar to the TRIUMF
“12Q12” type, as described in TRI-BN-11-02. The “strong” kind will be conventional. The “medium” kind
will be one or the other; its type will be one of the goals of the design work.
Type
Pole
weak
medium
strong
Round
?
Conventional
K = B 0 Leff
(Tesla)
0.2
0.5
1.2
Aperture
(mm ID)
52
52
52
Cooling
Air
Unknown
Water
Table 1: Quadrupole major parameters
D-PACE shall confirm whether the cooling methods are appropriate and make a recommendation for a cost
effective design including choice of cooling method for the medium strength quadrupole.
D-PACE shall include1 the following in each preliminary design document:
a) A record of engineering calculations similar to those in TRI-DNA-99-5 (or DPACE Note 2010027) but
modified according to whether air or water cooled designs are appropriate
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b) Relevant 2D projections of the magnets with important dimensions shall be given for the physical
magnet design
c) 2D Magnetic field plots illustrating magnetic flux density profiles in the pole pieces and the air gap.
Magnetic flux density in the yoke at maximum current conditions shall be illustrated as a 2D plot to
confirm that yokes are not saturated.
d) A brief synopsis of the work, including concise answers to the following questions:
i. Up to what strength can the short quad be air cooled?
ii. Is indirect or yoke cooling a possibility?
iii. What is the shortest practical length for the strongest quad needed?
iv. Can we find pole material that will keep remanent field below 10 Gauss?
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Terms
The following terms are proposed.
a) DPACE shall provide consulting design work at the engineering rate of $150/hour up to a maximum
total of 80 hours.
i. 50% down payment upon receipt of purchase order. Net 10 days.
ii. 50% payment upon receipt of design documents at TRIUMF. Net 30 days.
b) Completion date: 30th September 2011 or earlier.
c) If D-PACE anticipates that total hours shall exceed 80, then the scope above shall be reduced and
item c) 2D magnetic field plots shall be eliminated. It is more important to have preliminary designs
for all three magnet types than to have a more complete design for any one of them.
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Contact
Rick Baartman will be the primary TRIUMF contact during the course of this contract. D-PACE should
communicate directly with him at the commencement to verify that D-PACE understands the aims and
priorities in the scope of work. TRIUMF is open to negotiation of the completion date, but may withdraw
if D-PACE proposed delivery date is inconsistent with the ARIEL e-linac design schedule.
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