Scintillating Fiber, Ribbon Production, Cryo Update Alan Bross MICE Tracker Meeting IC November 8, 2006

Status  Ribbon Mirroring continues. 54 runs have been mirrored u Mean R = 76% RMS=4%

Mirroring Status  From Eileen u All fiber prep work is complete s Cutting s Inspection s Polishing u Approximately 55k fibers sputtered (mirrored) (about 2/3) u The expected rate from now is about 6000/week s Finish 3 rd week of November u A second sputtering system has been put together, but we are waiting for new sputtering gun (est. delivery 10/31) s Could speed things up a bit  Note: u The lock-in amplifier used for the reflective measurements died last week and a new setup was assembled. The RMS on the measurements is not as good as before and for some reason, the R measurement seems to be about 1% lower systematically (??)

Waveguide Fiber QC  Measurements continue on the waveguide fiber u So far so good u Will try to get measurements done before WG production starts = 8.8 m LOT 1

= 8.5 m LOT 2

= 8.8 m LOT 3

New Ribbons  Roger Hare was at Fermilab for about two weeks and helped a great deal u Prep’d fibers u Measured molds and confirmed number of grooves and pitch u Ribbon Layup  Production Ribbons u 10 are ready for shipment u Schedule s Have added some additional tech help s Still need one more person for fiber prep in order to keep up with ribbon layup s Goal is to finish by end of year

Cryogenic system status Prototype – conclusion Production cryostats Russ Rucinski

Prototype - Conclusion  Design iterations are concluded.  Improvements will be incorporated into the production cryostats. u Stronger clamping bars with ball bearing point contact. u Indium tape at thermal interface to envelope. u Invar washers and torque specifications for thermal connections of thermal links. u Reflective tape on all surfaces to reduce radiation heat load.

Prototype – Conclusion II  Total heat load on the cryocooler is about 60 Watts & 4 Watts at the upper and lower stages.  Cassette temps with no heaters are 7.0 K and 7.5 K for cassette #105 and #112.  Cassette heat load estimated 0.74 watts & 1.2 watts for cassette #105 and #112.  Expect to run about 0.3 K warmer at 50 Hz in UK.  The operating margin at 50 Hz will be about 1 Kelvin in temperature, or 2 Watts in heat load at the lower stage.

Production Cryostats I  All eight invar envelopes have been received from Ability Engineering. Initial warp problems on three envelopes were corrected. Five envelopes shown, three are in a different box. All parts from Ability have been received.

Production Cryostats II  The lid heater has been epoxied into the first lid.  The gas plumbing is in place.  The first lid heater controls box is almost built. The controls box also contains the low pressure alarm and condensate alarm. We can test the function of the box in a magnetic field in the future.

Production Cryostats III  We will continue to construct the first production cryostat. It should be done before the end of the year.  New parts for the additional two /DAQ controls racks have been ordered.  Everything looks optimistic and on schedule.!