1. H. Felice, M. Segreti,, J.M. Rifflet, D. Simon
Q4 update
Q4 update
H. Felice, M. Segreti,, J.M. Rifflet, D. Simon
WP3 April 20th 2016

2. Status on Q4 short model 2nd mock up in fabrication
WP3 April 20th 2016

3. Status on Q4 short model Layer jump appears too tight in mock-up #2
Several layer jump design are being tested
Coil fabrication tooling: drawings completed
Modification will be required for layer jump
Collaring press
Visit at CERN on 12/13th of April
Discussion with Glyn Kirby on thecnical aspects
Need to plan for another visit to discuss with Juan Carlos Perez
Collar drawings are being finalized
Discussion started and ongoing with Arnaud Foussat toward integration and procurement
WP3 April 20th 2016

4. Status on Q4 short model
Cable dimensions discrepancy from various sources:
ROXIE cadata: 0,78/0,91 => 0,845 mid thickness
LHC design report: 0,84 mid thickness
MQM cable spec: 0,77/0,91 => 0,840 mid thickness
In stock (from J. Fleiter):
Keystone deg   0.879
Width mm        8.819
mid thick mm  0.841
ROXIE case with 0,0825mm of insulation around the cable (to compensate): 0,89 units of b6
In reality: 0,085mm of insulation on the inner edge and 0,080 mm on the outer edge
Impact on field quality to be quantified
Impact on pre-stress => seems marginal
Width? => cable in stock seems out of spec
In any case, for consistancy => we think we need to rework the magnetic design
Could be available in ~3 weeks
Concern:
designer availability => in discussion at CEA
Back-up plan on CERN side?
Spec MQM cable
Inner edge
Outer edge
WP3 April 20th 2016

5. The short model design and fabrication is progressing but…
At CEA: Same resources for Q4 short model and QuaCo => strong impact (several months of delay) of QuaCo on short model progress
WP3 April 20th 2016