7/12/09 CLIC Module WG:
“CLIC Quadrupoles Prototype Status”
Michele Modena – CERN TE/MSC
1): Main Beam Quadrupole prototypes (LONG and SHORT)
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1a) Procurement STATUS at TESLA– UK (coils manufacturing):
Drawings “for manufacturing: completed after an iteration due
to Tesla request (see after)
Materials (steel): delivered from CERN
Manufacturing plan: completed
Production: started
During the engineering of the coils exit, TESLA encountered some
problem in respecting the requested dimension. So, they required
to have slightly more space to develop the heads coils winding.
We accept it and slightly changed the length of the iron yoke to
leave unchanged the OVERALL length of the magnets (this apply
to the LONG and SHORT prototypes)
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1): Main Beam Quadrupole prototypes (LONG and SHORT)
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1b) Procurement STATUS at Heeze – NL (steel quadrants manufacturing):
Drawings “for manufacturing: completed after an iteration due to TESLA
request on coils longitudinal dimension: steel quadrants are now slightly
SHORTER (1844 1827 mm; 344  332 mm):
Materials (steel): delivered from CERN
High precision machining: started
It will be done in 2 steps: 1st at Heeze (machining), 2nd at “De Rooij Slijperij”
(final high-precision grinding)
Despite our request to have the LONG quadrants done before, the Company
strongly asked to produce some samples and the SHORT quadrants before.
We now expect to have the short quadrant ready for beginning of January
and the long for end of January…
By discussions (and samples) with the Company on how design the most
performing (most precise) quadrants assembly, we decided to have the short
quadrants machined with an alternative assembly solution (see photo and
samples).
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Standard (for LONG
proto)
Alternative (for
SHORT proto)
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2): EXTRA quadrant (LONG) procurement
Procurement status at OSTROJ – CZ (for one steel quadrant
manufacturing):
- LONG type quadrant, standard (CERN) drawing, no extra slots by
wire-erosion), no extra holes for transport, no changes…
They are starting the manufacturing; delivery expected also in
January.
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3): Dipole Corrector for MB quads
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Study for a dipole corrector to be integrated in each MB quad
(H. Smickler on September 09) :
Required kick strength: 4 mT∙m (ex. 0.4T over 1 cm of magnetic
length).
To be “attach” to each MB quad
First computation (A. Vorozhtsov) to investigate a design
compatible (ex. partially “nested”) with the MB quadrupole (see
next slides)
Detailed magnetic cross-talk computation (3D) ongoing.
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• DB Quadrupoles:
- Remind: in CLIC layout, DB quad gradient is varying from 8.12 to
81.2 T/m
- For CLIC and CLEX Test Program we propose to procure 6-8
prototypes eventually investigating different technologies and
design (Ex. standard EM design and Hybrid Permanent Magnet
design)
- In order to advance we need to decide which gradient will be
necessary in the CLEX layout: last news says it should be in the
range 0-8 T/m. Waiting a final confirmation from CLIC Physic Team.
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