1. HIE-ISOLDE HEBT vacuum system
M.Hermann on behalf of G.Vandoni
TE/VSC
G.Vandoni, HEBT Technical Design Review
6th July 2012

2. Vacuum layout Sectorization in 4 vacuum sectors
Diagnostics by cold cathode gauges of pirani type and passive penning gauges on T-pieces
Turbomolecular pumps (60 l/s) on diagnostic Boxes: ~1 every 2 DB
Primary dry scrolls or multiroot pumps for backing & roughing
Minimal displacement of core equipment between phases
Protection of SC linac vacuum by fast valve + cryotrap
Fast valves between cryomodules NOT in this review
fast acting valve
roughing
Pennings for
fast acting valve
backing
G.Vandoni, HEBT Technical Design Review
6th July 2012

3. Cryotrap and Fast Valves
SCOPE:
Protect the SC linac against leak propagation from the experiments, sweeping (non-clean room) vacuum chambers with air towards the cold cavities.
air leak propagation speed*:
~ K
fast valves reaction time:
≤ 20 ms
minimal distance:
~ 20 m
*Experience gained in LHC 3-4 accident: dust particles are dragged at the velocity of the gas (air) flow
In SR light sources, fast valves + acoustic delay lines (ADLs) are used to protect the machine from vacuum loss in the beam lines. ADLs are stacks of diaphragms, ~12 m long.
 Single diaphragm is used as delay device in SR sources, when space is not sufficient for ADLs.
TRIUMF ISAC II uses cryotraps at ~ 77K to separate dry (hydrocarbon free) vacuum from non-dry conventional vacuum.
courtesy D.Yosifov
Propagation speed, goes with r:
 To be determined, if factor of 3.75 gained by a cold section
Dynamical MC and experimental verification needed to assess reaction time of fast valves and delay by diaphragms or cold-trap
G.Vandoni, HEBT Technical Design Review
6th July 2012

4. Vacuum chambers TECHNICAL CHOICES
Based on the requested beam aperture, modulated by tolerance considerations (see next table)
Flanges are ISO-KF: nearly zero-length installation in a tight layout
Seals will be all-metal
Material is 316L
PROCUREMENT STRATEGY
In-house, from drawing to vacuum tests
(small workpackage, know-how is readily available, agreed with EN/MME)
G.Vandoni, HEBT Technical Design Review
6th July 2012

5. Table of tolerances, quadrupoles and drift chambers
HIE-Isolde HEBT LINES BEAM PIPES - "STANDARD" ALIGNMENT (SU for magnets and instrumentation, VAC for pipes)
MQF/MQD Pipe Ø42/45
Free Pipe Ø51.2/57
Comments
Magnet aperture (diameter) 50
Value given by J.Bauche (MSC).
Magnet aperture tolerance (diameter)
0.1
Min. Gap between pipe and magnet aperture (pipe centered in the magnet)
5.8
Pipe insulation thickness (diameter)
no insulation
Pipe thickness (diameter)
1.5
2.9
Value given by MME design office.
Pipe nominal internal diameter 42
51.2
Value proposed by MME design office, from standard hollow shaped blanks, 45/38mm.
Pipe nominal external diameter 45 57
Maximum diameter loss due to pipe manufacturing tolerances
1.2
2.8
Value given by MME main workshop. Configuration worst cases.
Maximum diameter loss due to vacuum deformation (constant value)
Value given by MME design office (negligible).
Maximum diameter loss due to gravity deformation (constant value)
Value calculated by MME design office (negligible)
Minimum mechanical aperture (diameter)
41.4
49.8
Tolerance of position between magnet axis and theoretical beam axis (alignment by SU at 3 sigma)
±0.6
Table of alignment tolerances given by A.Parfenova/B.Goddard. Value at 2.4sigma.
Maximum diameter loss due to the tolerance of position between magnets and theoretical beam axis
Table of alignment tolerances given by A.Parfenova/B.Goddard.
Maximum diameter loss due to the tolerance of coaxiality between pipe and magnet axis
0.4
Value given by MME design office according to components tolerances.
Maximum diameter loss due to the tolerance of position between pipe and theoretical beam axis (manual alignment using ground marking out)
13.5
Maximum estimated value, M.Jones (SU), J.Hansen (VAC) for Linac4; may be improved.
Minimum diameter available for beam (loss = sum of tolerances)
39.8
36.3
Diameter centered on theoretical beam axis.
Quadratic diameter loss (sum of constants + root-mean-square of tolerances)
1.4
Calculated with the values of the table above.
Minimum diameter available for beam (loss = quadratic beam diameter loss)
40.6
37.7
G.Vandoni, HEBT Technical Design Review
6th July 2012
based on EDMS , B.Riffaud

6. Magnet vacuum chamber DIPOLES QUADRUPOLES PRE-STUDY
GSI magnets, Al chamber
courtesy J.Bauche
G.Vandoni, HEBT Technical Design Review
6th July 2012

7. Planning
HEBT Vacuum Workpackage
2012
2013
2014
Start
Resources Q1 Q2 Q3 Q4
Transfer Lines phase 1
Layout ready
25/04/2012
Integration
EN/MEF, EN/MME, TE/VSC, TE/MSC
Design of magnets ready
Kick-off design & production
30/06/2012
Design
Design & Integration preliminary work
Drafting office
Quadrupole chambers
01/09/2012
DB+steerer chambers
01/10/2012
Dipole chambers
01/11/2012
Drift vacuum chambers
01/03/2013
Production
Procurement raw material
Central Workshop
Procurement circular bellows
02/12/2012
Procurement racetrack bellows
01/01/2013
01/04/2013
chambers ready for installation in magnet
31/07/2013
01/05/2013
30/11/2013
Equipment
Vacuum equipment
01/07/2013
VSC
Installation
Installation of magnets, beam diagnostics, drift chambers
01/03/2014
Vacuum equipment procurement is all with existing framework contracts! No delay, no FC, no ITT
G.Vandoni, HEBT Technical Design Review
6th July 2012

8. Budget & procurement 6th July 2012
Vacuum equipment
143000
Item
Quantity
Estimated cost
Total
Delivery delay
strategy
risks
turbomolecular pumps 8
5000
40000
6 weeks
framework contract
none
HV isolation valves
3500
28000
Sector valves 5
7000
35000
Passive Pirani gauges
1200
6000
8 weeks
CERN catalogue
Passive Penning gauges
1000
(Active digital gauges) 10
unique supplier
no experience in VSC
Venting valves
500
2500
2 weeks
Leak detection valves
Primary pumps 2
12000
24000
Vacuum chambers
Sub-item
Unit
Unit cost
Total cost
Comment
risk
Normal drift and quad
Design office
hours
480 51
24480
~30 vacuum chambers
160h=1months, EN/mme
insourcing
interference with LS1
Raw material
Production
meter
24.6
61500
conical flanges, straight circular chambers
"
Cleaning
230
5658
normal cleaning for UHV
Testing 62
1525.2
normal chambers and bellows
Bending magnet chambers
160h=1month
Production, units
units
25000
50000
2 bending chambers
1150
310
Supports
22000
Normal chamber's supports 20
1100
Primary manifold
12300
pipework
Installation & tests
40040
Industrial support
520 77
TOTAL
386443
6th July 2012
G.Vandoni, HEBT Technical Design Review

9. Vacuum specification
All vacuum specifications for the HIE-ISOLDE linac and HEBT are written down in the document “Vacuum specification of components and equipment for the HIE linac”
The spec is currently being controlled in the group
It fixes limits to outgassing and states which are the correct procedures and norms applicable to leak testing
These tests are within the WP up to the limits given in the WP description
The spec further gives guidelines for sound vacuum design to avoid virtual leaks, minimize outgassing and reduce the risk of leaks
Additionally it gives the guidelines for materials suited for vacuum use
Currently reviewed: HIE ISOLDE vacuum spec, EDMS no
G.Vandoni, HEBT Technical Design Review
6th July 2012

10. Vacuum follows the HEBT project baseline
Conclusions
Vacuum layout close to being frozen
Cryotrap needs evaluation, but no showstopper
Solving integration conflicts to “close” vacuum
Circular vacuum chambers defined
Pre-study for dipole magnet vacuum chambers done
Vacuum follows the HEBT project baseline
G.Vandoni, HEBT Technical Design Review
6th July 2012

11. Thank you for your attention
G.Vandoni, HEBT Technical Design Review
6th July 2012