Sophie Baron

TTC news

December 04

TTC 1

       TTCrq TTCoc TTCex TTC fibres TTC relocation TTC commissioning TTC upgrade

Summary

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 14 th 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:

MultiMode Fibers TTC crate TTCex MultiMode Fiber TTCoc MultiMode Fibers TTC receiver TTC receiver TTC receiver 1-16 or 1-32

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

TTC receiver TTC receiver TTC receiver

Sophie Baron TTC 5

-6 -8 0 -10 -12 -14 -16 -18 -20 -32 -33 0 -34 -35 -36 -37 -38 -39 -40 -41 -42

TTCoc



Output optical power and spread measured on the output of 4 TTCoc with TTCvx as optical source

5 5 10

Output # Output optical power and spread measured on the output of 4 TTCoc with TTCex as optical source +3dB SM attenuation

10 15 15 20 20 fibernet TTCocPrototype TTCoc19 TTCoc10 fibernet TTCocPrototype TTCoc19 TTCoc10 Consequences: • Insertion loss can be from -17 up to -5 dB on the outputs of the same 1/16 coupler (specs -14dB) • The signal timing is very sensitive to the motion of the first MM patch (between the laser and the coupler) • Multimode attenuators are not efficient because the signal is not really a multimode signal • Singlemode attenuator effect is ~x3 because of the diameter change • We can not specify the maximum spread of the coupler for this type of use

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.

Sophie Baron

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.

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 + MM2MM 16 Scrambler + MM2MM 32 Fibernet 840$ 633 € Comcore (China) 480$ 362 € FCI (CAN CH) 876 € Comcore via Laser 2000 (F) 532 € 1380$ 1041 € 799$ 603 € 1819 € 830 € 880$ 664 € 1420$ 1071 € 388+117= 505 € 950+117= 1067 €

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 - P5-PCR-P5 - 20 km - 30/11/04 - 7/12/04 Fibre Check B4-PCR-P5-PCR-B4: 30 km, between 12/11/04 and 18/11/04

-7.40E-09 -7.60E-09 1 -7.80E-09 -8.00E-09 -8.20E-09 -8.40E-09 -8.60E-09 -8.80E-09 145 289 433 577 721 865 1009 3.40E-09 3.35E-09 3.30E-09 3.25E-09 3.20E-09 3.15E-09 3.10E-09 3.05E-09 3.00E-09 2.95E-09 2.90E-09 1

1 mesure every 10 min. 144 measurements = 1 day

49 97 145 193 241 289

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 337

Sophie Baron TTC 11

TTCex – Clock generation

 40.09

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

40083300.00

40082800.00

40082300.00

40081800.00

40081300.00

40080800.00

40080300.00

0 10 20 30 40

temperature (C)

50 60 70 2V4 Diode 6V2 Diode Excess Jitter Points for crystal TTCex 6V2 diode range test 40.085

40.08

40.075

40.07

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

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 1 st quarter of 2005

Sophie Baron TTC 13

TTC relocation

 PCR - AB/CO lab – CCC • Relocation in the AB/CO lab on the 10 th • • • • New fibres installed on the 15 th of January for one year of January PCR computer room dismantled on the 24 th 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