US ATLASPHASE II Upgrade

BASIS of ESTIMATE (BoE)

Date of Est: 15-Nov-2015

Prepared by: Bing Zhou

Docdb #:

WBS number: 6.6.5.3 WBS Title: sMDT chamber construction

WBS Dictionary Definition:

Construction and test of 48 small-tube MDT (sMDT) chambers for the ATLAS barrel MDT detector.Estimate Type (check all that apply – see BOE Report for estimate type by activity):

X Work Complete X Existing Purchase Order___ Catalog Listing or Industrial Construction Database___ Documented Vendor Estimate based on Drawings/ Sketches/ Specifications X Engineering Estimate based on Similar Items or Procedures X Engineering Estimate based on Analysis X Expert Opinion

Supporting Documents (including but not limited to):

Details of the Base Estimate (Explanation of the Work)

The present big sector MDT chambers in the inner barrel station of the ATLAS muon spectrometer need to be replaced with a combination of sMDT chambers with thin-gap RPC chambers in order to provide high efficiency muon trigger in the barrel region. There are 96 sMDT chambers that need to be built and we propose to build half of them at the University of Michigan. In total there are 24,000 thin-wall (0.4 mm) aluminum drift tubes with a wire diameter f 50 mm and a length of 1.67 m. The table below shows the cost and labor hours.

Construction budget profile 2019 2020 2021 2022 total (k$)

Manpower cost (in k$) 273 395 451 472 1,591

M&S cost (in k$) 515 365 290 290 1462

Total (in k$) 789 760 742 762 3,053

The material cost is based on inputs from MPI for tooling and chamber construction parts and materials cost based on the real set up and constructing the sMDT chamber (for sMDT 7-8 for Phase I upgrade). We expect to use the same venter to make the purchasing of the materials through CERN central purchasing as what has been done for Run 1 MDT construction. Manpower estimate is based on manpower cost rate at Michigan, and our previous experience in building the MDT muon detector at Michigan. We have used a factor of two less manpower in the cost estimation compared the manpower

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used for Run 1 MDT construction by taking into account that the BIS chamber size is more than a factor of 2 smaller, and should be easier to handle in construction. The construction clean rooms and infrastructure (such as granite table and electric tables and some other equipment, such as high precision He leaking detector) at Michigan for MDT construction can be used without additional cost for Phase II sMDT construction.

Risk Analysis

Risk of this construction project is very low since we built 32000 long drift tubes and 80 largest MDT chambers for the ATLAS Muon Spectrometer for the current running ATLAS detector. The quality of the MDT chambers built at Michigan is high and running reliably over the Run 1 and now in Run 2 operations. Moreover, Michigan kept the construction rooms and facilities and experienced engineers (Curtis Weavedyke, Tiesheng Dai and Bob Ball), and physicists (Bing Zhou, Dan Levin, Shawn McKee, Claudio Ferretti and Ed Diehl). In addition we have two young faculty members, Junjie Zhu and Tom Schwarz, that are heavily involved in Phase I and Phase II upgrades.

M&S Contingency Rules Applied

Rule 5: 40% based on our past experience with the present MDT construction at Michigan.

Labor Contingency Rules Applied

Rule 3: 30% contingency on labor for the sMDT chamber construction.

Comments:Figure 1 shows the tube and chamber structure (currently built at MPI for Phase I BIS7-8)

Details of the cost estimation listed here:1. Total M&S cost: $3,053k ($1,462k for M&S and $1,591k for manpower); Core contribution

to Phase II muon detector upgrade: $1,062k.

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2. Construction of tube/chamber assembly tooling – total cost $778.653kTotal tooling cost $400.0kTotal manpower cost to build tooling: $378.653k (1.5 FTE Mech. Engineer, 1.5 FTE Mech Tech. and 1 FTE engineer student for total 1.5 years: FY2019 – FY2020)

3. Materials and services for 48 sMDT cost $1,062k4. Manpower for tube construction and test (2.5 years): (2.5 FTE Mech. Tech. and 4 FTE

engineering students). Total cost (from 2020 – 2022) $452.519k.5. Manpower for Chamber construction and test (2.5 years): (total 1 FTE Mech engineer, 1

FTE Elec. Engineer, 4.5 FTE Mech. Tech, and 1.5 FTE engineer students). Total cost (from 2020 – 2022) $759.823.

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