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CLAS 12 R1 Statement of Work (SoW)


Probably need to delay schedule to start in February (takes 3 Months to arrange a contract)

Feb 27 deadline for ISU DC construction contract to be in place.

Stringing fixtures won't arrive by Nov 1.

Construction Phases

Week Date Description
0 April 4, 2011 Issue Construction contract
4 May 2,2011 Hire lead stringer send to JLab for training
14 July 11, 2011 Clean room installed at ISU, Readiness Review, Hire 1st stringing team
36 Dec. 12, 2011 Hire and begin training 2nd stinging team
40 Jan. 9, 2012 Begin stringing R1 Chamber 3
45 Feb. 13, 2012 Complete stringing R1 C2
66 July 9, 2012 Complete Stringing R1 C3
71 Aug. 13, 2012 Complete Stringing R1 C4
94 Jan. 21, 2013 Complete Stringing R1 C5
97 Feb 11, 2013 Complete Stringing R1 C6
104 April 1, 2013 Ship chambers, fixtures, platforms and crane to JLab

You can measure the tension on 100 wires in about 1 hour. (G. Jacobs)
Don't train stringers on sense wires, use guard wires
Need three people for tension measurements, sometimes a single stringer can string in case someone is sick and perhaps we could have one stringer be one of the three doing the tension measurement.


Lead stringer spends < 5 Months initially at JLab stringing 1/2 of a R1 chamber, then 2 years at ISU stringing the rest , and then the last few months back at JLab receiving and installing the chambers in the Hall.

Start Date End Date Position cost 21% Fringe 18% Overhead total
03/01/2011 10/31/2013 Lead Stringer (all construction tasks) 60,000/yr * 3 yrs = 180,000 37,800 32,400 250,200
06/04/2011 09/29/2012 Stringer 1 & 2 (A,C,E) (stringing and tension measurements) 2 x ($20/hr * 40 hr/week * 83 weeks) =132,800 27,888 23,904 184,592
08/02/2011 10/03/2012 Stringer 3 & 4 (B,D,F) (stringing, tension measurements, window installation) 2 x ($20/hr * 40 hr/week * 75 weeks) =120,000 25,200 21,600 166,800
03/01/2011 07/30/2012 Technician (computer systems, electronics, mechanical, instrument) 40,000/yr * 92 weeks = 70,770 14,861 12,738 98,369
Current total



The stringing, instrumentation, and testing of the R1 Drift chambers will require the hiring of 6 technicians. One technician, known as the "lead stringer", will be responsible for overseeing the remaining technicians, maintaining strict quality controls, updating progress reports, working towards solving problems which occur during the construction process, and assist with the R1 installation at JLab. Four technicians will be hired at a cost of $20/hr which will be responsible for stringing the wires in the Drift chambers. The last technician will test wire tension, attach electronic boards, and provide support for the other technicians as needed.

The workforce will be deployed in 3 stages. The first stage will be to hire the lead stringer and technician. The lead stringer will be trained at JLab for at least 3 weeks in the art of stringing, instrumenting and testing CLAS12 drift chambers. A technician, whose has a supporting role in the process will spend at least 1 week being trained on the use of the tension measurement apparatus and instrumentation procedure. Once training is complete, the lead stringer will return to ISU and begin the hiring process for 2 stringers. The second stage will be the training of two stringers by the lead stringer as the first R1 drift chamber (R1DCA) is strung. The third stage will be to hire 2 more stringers who will be trained during the stringing of the second R1 drift chamber (R1DCB). We expect to be stringing 2 chambers at a time after the first group of stringers has strung half of the wires for R1DCA. The technician will be spot checking tension during the first stage. Since instrumentation requires substantially less time than stringing, our expectation is that the technician will spend some time supporting the string tension measurements as well as instrumenting and testing strung drift chambers.

Operating Costs

Consumables $30,454

Cost Item
5,000 Clean room Frocks and Pants for 3 years
800 dedicated Clean room shoes for 4 stringers (stringers won't wear booties)
500 dedicated Clean room STEEL TOE shoes for 2 Riggers
1,500 Shoe covers for technicians, lead stringer, quality control inspector and other visitors
2,304 Head covers for all personnel
800 Face masks for stringers and technicians
2700 Nitrile Gloves for 3 years
4000 Lint Free Clean room wipes for 3 years
1800 Tacky Mates 3 locations for 3 years
500 Tacky roller replacement heads used daily to clean floor for 3 years
1600 Cleaning supplies, mops, buckets, solutions for 3 years
952 Hysol EA 9360 Epoxy
1300 Epon 826 Resin
800 Versamid 140 Hardener
100 Epoxy mixing supplies
400 Alcohol
50 Appllicator Rollers and putty knives
400 Glue Applicator Syringes, tips, plungers
400 Ultasonic Cleaner and solutions
4500 AR/CO2 gas bottles and rental fees for 3 years

Equipment $51,565

Cost Item
125 Gas bottle cart
1000 Gas bottle regulators and hoses
1530 Clean room quality work tables
2800 Clean room quality cabinets
1200 Clean room quality utility carts
1000 Dressing room frurniture
1500 Clean room tool chests
1000 4 clean room chairs
1000 Clean room fire save trash containers and 3 year supply of bags
500 Torque wrenches
50 pry bar
500 allen socket sets
500 wrench set
650 lifting straps
300 calibrated weight set for wire tension
180 micrometers
600 Crimping tool
3180 $53 precision wire cutters, 5 sets with 3 each x 4 stringers
6000 CAEN N1470 , 4 channel High voltage power supply
6000 2 Wire tension magnet power supply
1000 2 PCs, one for wire testing another for data base server
350 solder station
300 gram scale for glue mixing
1200 packing material for shipping
1200 shock absorbers for shipping boxes
300 guage to record shocks encountered during shipping
4000 shipping crates
10,000 Truck shipping fee (old quote needs to be updates)


File:SOW V1.doc

File:SOW V2.doc