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					               TTC news

               December 04




Sophie Baron       TTC       1
                      Summary
 TTCrq
 TTCoc
 TTCex
 TTC fibres
 TTC relocation
 TTC commissioning
 TTC upgrade




Sophie Baron            TTC     2
                                     TTCrq
 Activity Dips problem, by Paulo:
 Prototype status (1):
       •   Production tests passed
       •   Jitter analysed




Sophie Baron                          TTC    3
                                   TTCrq
 Prototype status (2)
       •   Temperature test running – 2 prototypes validated
       •   Radiation tests scheduled for the 14th of December on 2 of these
           boards (F. Anghinolfi). Main targets: LVDS driver and regulator.
 Preproduction:
       •   200 boards for urgent needs
               o 50 for Atlas
               o ~80 for CMS
               o 10 for Alice
       •   PCB & assembly at Barco (Belgium)
       •   Scheduled for mid January
 Modifications of the previous version:
       •   If there is some interest, we can arrange a way to upgrade the old
           versions of the TTCrq at Millerin’s workshop

Sophie Baron                           TTC                                    4
                                                       TTCoc
    Problem description:


                                                                     TTC crate
                                                       TTCex



                                                          MultiMode Fiber

                                                                              TTCoc




                               MultiMode Fibers                                  MultiMode Fibers




                                                               1-16 or 1-32
                    TTC          TTC        TTC                                       TTC        TTC        TTC
                    receiver     receiver   receiver                                  receiver   receiver   receiver




       •   Single mode laser source
       •   Multimode system (including the coupler)



Sophie Baron                                                   TTC                                                     5
                                                                                          TTCoc
                                                                                                                 Consequences:
                                                                                                                  •
                                Output optical power and spread measured on the output of 4 TTCoc
                                                   with TTCvx as optical source
                                                                                                                      Insertion loss can be from
                      -32                                                                                             -17 up to -5 dB on the
                      -33 0                 5            10            15            20

                      -34
                                                                                                                      outputs of the same 1/16
                                                                                                                      coupler (specs -14dB)
Optical power (dBm)




                                                                                                                  •
                      -35
                      -36                                                                    fibernet
                                                                                             TTCocPrototype
                                                                                                                      The signal timing is very
                      -37
                      -38
                                                                                             TTCoc19                  sensitive to the motion of
                                                                                             TTCoc10
                      -39                                                                                             the first MM patch
                      -40                                                                                             (between the laser and the
                      -41
                                                                                                                      coupler)
                                                                                                                  •
                      -42
                                                       Output #                                                       Multimode attenuators are
                                                                                                                      not efficient because the
                                   Output optical power and spread measured on the output of 4
                                    TTCoc with TTCex as optical source +3dB SM attenuation
                                                                                                                      signal is not really a
                                                                                                                      multimode signal
                       -6

                       -8
                            0               5             10           15            20                           •   Singlemode attenuator
                                                                                                                      effect is ~x3 because of the
Optical power (dBm)




                      -10
                                                                                                                      diameter change
                                                                                                                  •
                                                                                             fibernet
                      -12

                      -14
                                                                                             TTCocPrototype
                                                                                             TTCoc19
                                                                                                                      We can not specify the
                                                                                             TTCoc10                  maximum spread of the
                      -16
                                                                                                                      coupler for this type of use
                      -18

                      -20
                                                       Output #



Sophie Baron                                                                                        TTC                                          6
                                             TTCoc
    Possible solutions (1):
       •   MM source
       •   Mode scrambler on the output of the laser source
               o Example from Newport – to be inserted on the input of the coupler




                                                         Figure 5: Mode scrambler from Newport
                                                         Newport Price: 794 CHF.




               o Proposed solution from FCI: “special jumper” to be inserted on the output of
                 the laser pigtail.
                    • Forces single mode signal (very directional and concentrated) to travel through
                      multiple paths and have a broader and more even spatial distribution in the jumper
                      fiber prior to reaching splitter.
                    • 117€ and no need to change the couplers.
                    • Samples have been ordered.

Sophie Baron                                       TTC                                                     7
                                            TTCoc
    Possible solutions (2):
       •   Single mode fibres up to the coupler, and then:
               o SM2SM coupler + SM fibres up to the TRR
               o SM2MM coupler + MM fibres up to the TRR. Samples ordered at Fibernet by Atlas.
    Offers:
               SM2SM 16     SM2SM 32 SM2MM 16           SM2MM 32   Scrambler +       Scrambler +
                                                                   MM2MM 16          MM2MM 32

Fibernet       840$         1380$       880$            1420$
               633€         1041€       664€            1071€

Comcore        480$         799$
(China)        362€         603€

FCI (CAN- 876€              1819€                                  388+117= 505€     950+117= 1067€
CH)

Comcore        532€         830€
via Laser
2000 (F)


Sophie Baron                                      TTC                                              8
                                     Fibres
 Long term tests (annual) – BA3-SR4, 18km
       •   Made by Donat Stellfeld




       •   ~ 10 ns for 18 km and 25°C outdoor variation



Sophie Baron                           TTC                9
                                     Fibres
 Short term tests (diurnal)
       •   Made by Donat Stellfeld




       •   ~270ps / 18km / 72 hours


Sophie Baron                           TTC    10
                                                                                                               Fibres
                                    Short term tests (diurnal) – P5-PCR-P5 - running
                                        •           Made by Jan Troska and Sophie Baron
                                          Fibre Check B4-PCR-P5-PCR-B4: 30 km, between 12/11/04 and                                                                            Fibre check - P5-PCR-P5 - 20 km - 30/11/04 - 7/12/04
                                                                  18/11/04
                                                                                                                                                                3.40E-09
                                    -7.40E-09                                                                                                                   3.35E-09




                                                                                                                            delay between clock reference and
                                                1      145       289       433      577       721      865     1009
delay between clock reference and




                                    -7.60E-09                                                                                                                   3.30E-09
                                                                                                                                                                3.25E-09




                                                                                                                                     returned clock (s)
                                    -7.80E-09
         returned clock (s)




                                                                                                                                                                3.20E-09

                                    -8.00E-09                                                                                                                   3.15E-09

                                                                                                                                                                3.10E-09
                                    -8.20E-09
                                                                                                                                                                3.05E-09
                                    -8.40E-09                                                                                                                   3.00E-09
                                                                                                                                                                2.95E-09
                                    -8.60E-09
                                                                                                                                                                2.90E-09
                                    -8.80E-09                                                                                                                              1         49        97        145       193       241       289   337
                                                             1 mesure every 10 min. 144 measurements = 1 day                                                                           1 measurement every 30 min. 48 measurements = 1 day




                                        •           200ps / 10 km / 48 hours for small temperature change (max 6°C/48h)
                                        •           Could probably be up to 400 ps/ 48h for wider changes - test are still
                                                    running
                                        •           Is it a problem?
                                        •           Temperature compensated fibres still exist on the market : divide by 15
                                                    the change against T
Sophie Baron                                                                                                          TTC                                                                                                                     11
                                                              TTCex – Clock generation
                       Option 1: TTCex module modification to make the standalone clock
                        fit with the TTCrq locking range (40.075-40.082MHz)
                              •       VCXO voltage reference diode 6V2 => 2V4
                                                                                                                                               TTCex with 2V4/6V2 diodes
                                                                                                                                         standalone frequency versus temperature

                                                                                                                       40085300.00

                                                                                                                       40084800.00

                                                                                                                       40084300.00

                                                                                                                       40083800.00




                                                                                                      frequency (Hz)
                                                                                                                       40083300.00
                                                                                                                                                                                         2V4 Diode
                                                                                                                       40082800.00
                                                                                                                                                                                         6V2 Diode
                                                                                                                       40082300.00

                                                                                                                       40081800.00

                                                                                                                       40081300.00

                                                                                                                       40080800.00

                                                                                                                       40080300.00
                                                                                                                                     0   10      20     30       40      50    60   70
                                                                                                                                                       temperature (C)
                                        Excess Jitter Points for crystal TTCex 6V2 diode range test
                    40.09




                   40.085
 Frequency [MHz]




                    40.08




                   40.075




                    40.07
                        -10       0       10           20          30            40           50                   60            70
                                                             Temperature [C]




Sophie Baron                                                                                                                                           TTC                                           12
                  TTCex – Clock generation
 Option 2: New VME form-factor module with clock
     generator. 40.0787MHz with ECL fanout.
       •   1 quartz 80.1574MHz : 19-50 CHF (QuartzCom-Fordahl) (features from
           Per Gallno)
       •   Could be done 1st quarter of 2005




Sophie Baron                           TTC                                      13
                            TTC relocation
 PCR - AB/CO lab – CCC
       •   Relocation in the AB/CO lab on the 10th of January for one year
       •   New fibres installed on the 15th of January
       •   PCR computer room dismantled on the 24th of January
       •   Simulated 40.078MHz will be available end of January
       •   4 fibres available for the experiments. Possibly more punctually if
           needed (share with AB/CO)




Sophie Baron                            TTC                                  14
           Commissioning in the experiments
 OTDR requested for fibres measurements
       •   Precision?
               o >=1 m : classical OTDR (5000-20000 €)
               o < 1 m : photon counting technique (22000-26000 €)
       •   Wavelength?
       •   Single-mode or Multi-mode?
       •   Can be purchased by the pool
 Other needs?




Sophie Baron                              TTC                        15
                               TTC upgrade
 Define upgrade of modules with AB/CO on Q1 of 2005
       •   Same principle
       •   VME form factor (?)
       •   Remote monitoring & diagnosis
       •   Maintenance simplified
       •   Spares easier to produce
       •   NEED TO FIND A WAY FOR: extra TTCrx chips for receivers
               o PCR
               o Experiments




Sophie Baron                        TTC                              16

				
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