Continuing the Balun exchange program:

We installed new v3 Baluns on the following signals in the CER:

ISC-C4(39-1) 79.4MHz "ALS DIFF VCO Return" exchanged v1-102 with v3-S006

ISC-C4(39-2) 79.4MHz "ALS COMM VCO Return" exchanged v1-094 with v3-S068

ISC-C4(26-2) 45.5MHz "PEM Readback for Antenna Demod"  exchanged v1-055 with v3-S009

ISC-C4(19-8) 9.1MHz "PEM Readback for Antenna Demod" exchanged v1-147 with v3-S116

Work was completed per WP8190.  WP was modified to reduce impact to the IFO during this weeks maintenance, we did not touch squeezer.

Balun status can be seen here E1900100.

Continuing the Balun exchange Program:

We installed new V3 baluns on the following 45MHz signals in the LVEA:

ISC-R1 (41-6) 45MHz Auxiliary Modulation (EOM Driver) exchanged v2-DG146 with v3-S152

ISC-R2 (41-2) 45MHz Distribution exchanged v2-DG083 with v3-S094

ISC-R3 (41-3) 45MHz Distribution exchanged v1-145 with v3-S117

Work was completed per WP8200, balun status can be seen here E1900100.

I have attached Insertion Loss and Leakage scans from the old baluns as well as the new ones.

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the PSL racks and at HAM6:

PSL-R2 (18-2) ISS AOM 80MHz exchanged DG-104 with v3-S069

ISC-R3 (41-2) Distribution 4th Harmonic exchanged v1-053 with v3-S160

ISC-R3 (41-4) Distribution 8th Harmonic exchanged v1-091 with v3-S040

ISC-R3 (39-4) Distribution 42.2MHz exchanged v1-125 with v3-S060

Work was completed per WP8215, balun status is in the same place it was last week, E1900100.

Attached is a comparision between the balun modified by hand (DG-104), and the new v3 balun which replaced it.

M. Pirello, P. King, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the PSL racks:

PSL-R2(17-1) FSS Modulation exchanged v1-043 with v3-S157

PSL-R2(17-2) FSS exchanged v1-014 with v3-S093

PSL-R2(17-4) PMC Modulation exchanged v1-021 with v3-S115

PSL-R2(17-5) PMC exchanged v1-050 with v3-S156

PSL-R2(17-6) Injection Locking exchanged v1-084 with v3-S095

ISC-R1(41-2) Distribution JAC Future exchanged v1-159 with v3-S092

** On the last one, the labels on the feed through may be more correct than the DCC.  I followed the cable path to the ALS VCO for the PSL.

If it is the ALS VCO, Peter told me that it is possibly 80MHz and in this case the difference between V1 and V3 is about 0.75dB more power, and no measurable difference in phase.  The PSL signals being under 45Mhz should be less than 1 degree difference in phase, and less than 0.25dB difference in power.

Work was completed per WP8208, balun status is in the same place it was last week, E1900100.

I have attached insertion loss and leakage scans of v1 vs v3 baluns.

We checked the ISC-R1 (41-2) Balun and determined this signal is the REFL_B demod, 9MHz.  There should be very little phase & power difference between V1 and V3 baluns at this frequency.

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the end stations.

EX-ISC-C1 (41-5) Return PLL Beat Note 39.5MHz exchanged v1-176 with v3-S050

EX-ISC-C1 (41-6) Return ALS Laser VCO 79.4Mhz exchanged v1-049 with v3-S042

EX-ISC-R1 (41-1) ALS Laser VCO 71MHz exchanged v1-189 with v3-S114

EX-ISC-C1 (41-5) Return PLL Beat Note 39.5MHz exchanged v1-137 with v3-S041

EX-ISC-C1 (41-6) Return ALS Laser VCO 79.4Mhz exchanged v1-199 with v3-S155

EX-ISC-R1 (41-1) ALS Laser VCO 71MHz exchanged v1-039 with v3-S059

Work was completed per WP8222, balun status is in the same place it was last week, E1900100.

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the Squeezer

ISC-R3 (39-1) 80MHz SQZ EOM (OPO) exchanged v1-178 with v3-S082

ISC-R3 (39-2) 35.5MHz SQZ EOM (SHG) exchanged v1-060 with  v3-S089

ISC-R3 (39-3) 200MHz SQZ EOM (CLF) exchanged v1-166 with v3-S031

SQZ-R1 (41-1) 80MHz OPO Demodulation exchanged v-122 with v3-S084

SQZ-R1 (41-2) 35.5MHz SHG Demodulation exchanged v1-020 with v3-S033

SQZ-R1 (39-3) 71MHz SQZ VCO Laser Locking exchanged v1-190 with v3-S083

Work was completed per WP8230, balun status is in the same place it was last week, E1900100.

** The 200MHz SQZ EOM CLF signal may require a slight phase change, about 8 degrees difference and 2dB more power with the V3.

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the Squeezer and the PSL racks:

SQZ-R1 (41-3) 3.125MHz SQZ Angle Demodulation exchanged v1-171 with v3-S108

SQZ-R1 (41-4) 3.125MHz SQZ Angle Demodulation exchanged v1-145 with v3-S109

SQZ-R1 (41-5) 6.25MHz CLF Demodulation exchanged v1-183 with v3-S085

ISC-R1 (41-1) 71MHz Distribution exchanged DG-02 with v3-S086

ISC-R1 (41-3) 15th Harmonic Modulation exchanged DG-01 with v3-S058

TCS-MEZ (41-1) TCS exchanged v1-153 with v3-S079

Work was completed per WP8240, balun status is in the same place it was last week, E1900100.

M. Pirello, D. Gustafson

Continuing the Balun exchange Program:

We installed new v3 baluns on the following signals at the field racks near the PSL:

ISC-R2 (41-1) 9MHz Distribution exchanged v1-047 with v3 S019

ISC-R2 (41-3) 2nd Harmnonic Distribution exchanged v1-098 with v3-S019

ISC-R2 (41-4) 3rd Harmonic Distribution exchanged v1-157 with v3-S015

ISC-R2 (41-5) 10th Harmonic Distribution exchanged v1-179 with v3-S016

ISC-R2 (41-6) 15th Harmonic Distribution exchanged v1-074 with v3-S132

ISC-R1 (41-4) 24MHz MC Distribution exchanged v1-040 with v3-S017

ISC-R1 (41-5) 9MHz Main Modulation exchanged v1-033 with v3-S018

Work was completed per WP8244, balun status located at this link: E1900100.  This concludes all "known" balun work at the corner station.  We are sprinting to next week where we intend to replace the remaining twelve v1 baluns at the end stations.

M. Pirello, D. Gustafson

Continuing the Balun exchange Program, we installed new v3 baluns on the following signals at both end stations:

EX

ISC-R1 (41-2) 24.4MHz Modulation exchanged v1-022 with v3-S074

ISC-R1 (41-3) 24.4MHz Demodulation exchanged v1-184 with v3-S131

ISC-R1 (41-4) Not Connected exchanged v1-064 with v3-S078

ISC-R1 (39-1) 24.4 WFS A Demod exchanged v1-077 with v3-119

ISC-R1 (39-2) 24.4 WFS B Demode exchanged v1-026 with v3-S076

ISC-R1 (39-3) 71 CPS Timing Fanout exchanged v1-059 with v3-S020

EY

ISC-R1 (41-2) 24.4MHz Modulation exchanged v1-127 with v3-S073

ISC-R1 (41-3) 24.4MHz Demodulation exchanged v1-118 with v3-S011

ISC-R1 (41-4) Not Connected exchanged v1-013 with v3-S012

ISC-R1 (39-1) 24.4 WFS A Demod exchanged v1-126 with v3-S075

ISC-R1 (39-2) 24.4 WFS B Demod exchanged v1-161 with v3-S013

ISC-R1 (39-3) 71 CPS Timing Fanout exchanged v1-191 with v3-S135

Work was completed per WP8255, balun status located at this link: E1900100.  

** In the process of walking through the LVEA we found 4 more Baluns hidden among the TCS and SUS racks which need upgrading.  We were able to upgarde one of these with this Tuesday, and will finish the remainder next maintenance day.

SUS-R3 (40-1) CPS HAM 71MHz exchanged v1-011 with v3-S113

This additional work was started per WP8261

M. Pirello, H. Radkins

The final three baluns were exchanged at the corner this morning for a total of 64 baluns replaced over 14 weeks.

TCS-R2 (41-1) 71Mhz CPS Timing exchanged v1-088 with v3-S144

TCS-R2 (41-2) N/A Empty signal with Balun exchanged v1-081 with v3-S001

TCS-R1 (41-6) TCS Signal from Mechanical Room exhcnaged v1-143 with v3-S045

All work finished per WP8261.  This completes work done per FRS9794 and ECR-E1700404 at LHO.