LINACs

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LINACs


Michael Bevins

May 17, 2007

12GeV Upgrade
-

Beam Transport

Injection, Linac, Extraction, &
Correctors

Preliminary Design and Safety Review

Outline


Introduction & Scope


Requirements & Specifications


New/Modified Linac
Elements/Girder Count


Beam Transport Layouts


Safety Considerations


Cost Estimates


Risk Assessment


Summary


Introduction & Scope


The12GeV upgrade requires an
additional ten cryomodules


Five in the north linac and five in
the south


NEW
modules are longer than the
original

CEBAF modules


Result: Warm region girders
downstream of the
new

modules
must be replaced with a
new

short
girder


Like downstream of SL21


12GeV field strength requirements force us to replace two QB quads at the
start of the linac with QCs


Songsheet level machine layouts, QB to QC mod, and the short warm region
girder will be presented along with cost estimates


Only
modified

sections of the LINACs will be included in this
presentation

Requirements & Specifications



Alignment specs


Quads positioned to +/
-
0.5mm in x & y, +/
-

1.0mm in z


Vacuum specs


Pre linac: (at MQB1L00 & 01)


Beam line partial pressure of hydrogen <10
-
6 torr


Total average pressure of all other constituents less than 5x10
-
7
torr


Warm region girders between cryomodules


UHV


Fabrication, welding, cleaning & handling, and leak checking specs still
apply


22631
-
S
-
001 Fabrication of Ultra
-
High Vacuum Equipment


22632
-
S
-
001 Cleaning and Handling of U.H.V. Components


22633
-
S
-
001 Welding Specification For U.H.V. Components


22634
-
S
-
001 Helium Leak Test For U.H.V. Components


Note an update and modernization of our vacuum specs is underway

New/Modified
Linac

Elements/Girder Count


Element
Qty
Element
Qty
Quads
12
Diagnostics
QB
10
BPM
12
QC
2
Viewer
2
Correctors
14
Vacuum
BT Horizontal
2
Ion Pump
18
BT Vertical
1
Convectron Gauge
1
DJ Vertical
5
Beam Valves
18
DB Horizontal
6
Fast Valve
2
DP Stations
2
Qty
Roughing Valve
10
New
Quad Girders
12
Warm Region Girders
10
Single Quad Girders
2
QC
2

Elements in red are part of I&C WBS

Beam Transport Layouts


N&S Linac


North Linac 1
st

Section


QB to QC change at MQB1L00 & 01


N&S Linac Sections 3 & 4


Add
new

modules in zones 22 through 25


Replace warm region girders with
new

short girder

North Linac

South Linac

Beam Transport Layouts


QB to QC change


MQB1L00 & MQB1L01 girder
modifications


Replace QB quads with higher strength
QCs


Shift MQB1L00 stand 4 inches upbeam
to improve girder stability


Shift MQB1L01 upbeam 7.6cm from
12GeV dimad position


View looking upbeam to MQB1L00 & 01 girders

MQB1L00

MQB1L01

Beam Transport Layouts


N&S Linac

New

module

Four
New

modules

Layout of new modules & girders in linac

Current Configuration (Zones 19


22)

12GeV Configuration (Zones 19


22)

Current Configuration (Zones 23


26)

12GeV Configuration (Zones 23


26)

Five
New

warm girders

DP station
moved to end
of linac

Replace module
baseplates

Beam Transport Layouts


Warm Region Girders

Old warm region girder

New
short warm region girder

Viewer & pump
drop cross

H&V nested
Air Core

correctors
over BPM

Quad

Existing
baseplate

New
stand


Warm girder design reviewed in Oct 2004


Prototyped and
installed

at SL21


Designed to accommodate multiple combinations of
cryomodule configurations


Quad, BPM, and alignment cartridges will be reused
on
new

short girders


Safety Considerations


Personnel Training


Jlab & sub
-
contractor


Radiation


Designated areas for containment and radiation survey
of material that will be removed from the tunnel


Material handling


Provide provisions for lifting


Electrical Hazards


Package and support electronics, power leads and
terminal blocks to control electrical hazards


Cost Estimates


LINAC WBS Rollup

12GeV Beam Transport Scope, Labor & Procurement Estimate
D/PM & J
Material
1.3.4.3
LINACS
13.7
5.7
107.9
127.4
20.4
115.9
19.5
2.8
0.0
0.0
1.3.4.3.2
QUADS &
CORRECTORS
2.2
2.0
4.1
8.3
2.1
14.7
3.7
2.8
0.0
0.0
1.3.4.3.3
GIRDERS &
STANDS
2.2
0.7
0.2
3.1
0.6
73.4
11.6
0.0
0.0
0.0
1.3.4.3.5
VACUUM
1.0
1.5
10.5
13.0
2.1
20.4
2.2
0.0
0.0
0.0
1.3.4.3.6
INSTALLATION &
ALIGNMENT
8.4
1.5
93.2
103.1
15.7
7.5
2.0
0.0
0.0
0.0
Total
Contingency
Total
Contingency
LABOR [Man Wks]
PROCUREMENTS [$k]
EXPENSES [$k]
WBS
ELEMENT
ME
MD
MT
Total
Contingency
WBS Elements I have covered today

Cost Estimates
-

Highlighted WBS

12GeV Beam Transport Scope, Labor & Procurement Estimate
WBS
ELEMENT /
Activity ID
ACTIVITY DEFINITION / SCOPE ITEMS
Basis
D/PM
J
D/PM & J
Total [$k]
1.3.4.3.3
GIRDERS &
STANDS
73.4
11.6
1
Proc/Vend Fab Linac Stands (Linac Stands)
13.2
2.0
m
Procure new warm girder stands
1200
11
13.2
eng jud
0.15
2.0
2
Proc/Vend Fab Linac Girders (Linac Girders)
48.4
0.16
7.9
m
Procure warm region girders
3710
11
40.8
eng jud
0.15
6.1
m
Fab new girders to accommodate QB to QC change at
MQB1L00 & MQB1L01
2550
2
5.1
eng jud
0.25
1.3
m
CF flange pair gasket and hardware
27
35
1.0
catalog
0.10
0.1
m
Fab beamline tie-in spools
300
5
1.5
eng jud
0.25
0.4
3
Proc/Vend Fab Linac viewer Pump drops (Linac Girders)
11.8
1.8
m
Procure warm girder viewer pump drops
1076
11
11.8
eng jud
0.15
1.8
Contingency
QTY
Total
[$k]
PROCUREMENTS
Unit
Cost [$]
Girder & Stand Procurements

Girder Cost
[FY07$]
Typical LINAC Warm Region Girder & Stand
7746
Supports & Hardware
2350
Stand
1200
Vac (includes 40L/s ion pump & roughing valve)
4196
* Warm girder qty includes one spare

* Warm girder cost reviewed as part of Quad review on May 3
rd

2007

Risk Assessment


Technical

-

Low


Girders & Supports


very similar

designs exist and are
already proven


Warm region girder prototyped and installed at SL21


Alignment
-

same as existing machine


Procurement Schedule

-

Low


No long
-
lead items identified


Cost



Low


Linac warm region girder recently prototyped


Good cost estimates for machined parts


Vendor & Jlab shop budgetary estimates

Summary


Preliminary LINAC beam transport layouts, cost and installation
estimates to support CEBAF at 12GeV are complete based on
present scope


We are in a good position to support our DOE External Project
Reviews this summer


We will continue to work closely with our friends throughout the lab
(safety, CASA, installation, vacuum, alignment, RadCon, I&C,
magnet measurement, operations, procurement & facilities) as we
move forward


Detailed design will be completed to support assembly and
installation schedules


We look forward to comments & recommendations from the
committee