Scintillating Fiber, Ribbon Production, Cryo

Update

Alan BrossMICE Tracker Meeting

IC November 8, 2006

Status

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

Frequency

0

20

40

60

80

100

120

140

160

0.6

0.62

50.

650.

675

0.7

0.72

50.

750.

775

0.8

0.82

50.

850.

875

0.9

0.92

5M

ore

Frequency

Mirroring Status

From Eileen All fiber prep work is complete

Cutting Inspection Polishing

Approximately 55k fibers sputtered (mirrored) (about 2/3) The expected rate from now is about 6000/week

Finish 3rd week of November A second sputtering system has been put together, but we

are waiting for new sputtering gun (est. delivery 10/31) Could speed things up a bit

Note: 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 So far so good Will try to get measurements done before WG production starts

Chart Title

y = 8.5226e-0.1141x

R2 = 0.995

0

1

2

3

4

5

6

7

8

0 1 2 3 4 5 6 7 8 9 10 11 12

Length (m)

Lig

ht

Yie

ld Light Yeild at Length

Expon. (Light Yeild atLength)

= 8.8 m

LOT 1

Att Length Section 1

y = 10.282e-0.1178x

R2 = 0.998

0123456789

0 5 10 15

Fibre Length

Lig

ht Series1

Expon. (Series1)

= 8.5 m

LOT 2

Att Length Section 2

y = 11.084e-0.1131x

R2 = 0.9787

2

3

4

5

6

7

8

9

10

0 2 4 6 8 10 12

Fibre Length

Lig

ht

Yie

ld

Series1

Expon. (Series1)

= 8.8 m

LOT 3

New Ribbons

Roger Hare was at Fermilab for about two weeks and helped a great deal

Prep’d fibers Measured molds and

confirmed number of grooves and pitch

Ribbon Layup Production Ribbons

10 are ready for shipment Schedule

Have added some additional tech help

Still need one more person for fiber prep in order to keep up with ribbon layup

Goal is to finish by end of year

Cryogenic system status

Prototype – conclusionProduction cryostats

Russ Rucinski

Prototype - Conclusion

Design iterations are concluded. Improvements will be incorporated into

the production cryostats. Stronger clamping bars with ball bearing point

contact. Indium tape at thermal interface to envelope. Invar washers and torque specifications for

thermal connections of thermal links. 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.!