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Elias Métral, RLC meeting, 02/12/2005
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E. MétralE. Métral
ENGINEERING DESIGN REVIEW (EDR) FOR THE
TOTEM ROMAN POTS (Thursday 24 Nov. 2005)
Charge to the Review Committee (from E. Tsesmelis, TS/LEA)
Check that the TOTEM Roman Pots perform according to the intended specifications
Endorse the general scenario for the engineering design, assembly and mounting of the TOTEM Roman Pots
Approve the TOTEM Roman Pot concept to allow detailed engineering drawings and technical specifications to proceed
Check the project organization, safety issues and compatibility with neighboring (machine) systems
Elias Métral, RLC meeting, 02/12/2005
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AGENDAAGENDA 1. Introduction (10') EMMANUEL TSESMELIS (TS-LEA)
2. Roman Pot Design (35') ( Slides ) MARCO ORI UNNO (PH-TOT)
3. RF Issues (20') ( Slides ) MARI O DEI LE (PH-TOT)
4. Thin window design (20') ( Slides ) SERGE MATHOT (TS-MME)
09:55 Coffee break
5. Vacuum integration at 147 m and 220 m (20') ( Slides ) CHRISTI AN RATHJ EN (AT-VAC)
6. Vacumm issues (20') ADRIANA ROSSI (AT-VAC)
7. Radiation environment and energy deposition in the thin window (20') ( Slides )
EVANGELIA DI MOVASI LI (TS-LEA)
8. Planning and installation (20') MARCO ORI UNNO (PH-TOT)
9. ATLAS Roman Pots at IR1 (20') ( Slides ) BENI AMINO DI GI ROLAMO (PH-ATT)
12:05 Lunch break
10. Closed session (1h00') Review Committee
11. Comments from the Review Commitee (30') EMMANUEL TSESMELIS (TS-LEA)
Elias Métral, RLC meeting, 02/12/2005
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The TOTEM Experiment at LHCThe TOTEM Experiment at LHC
Forward Physics at Interaction Point 5
Elastic p-p scattering Total p-p cross section Diffractive physics Absolute luminosity measurement
Needs detection of leading protons with very small scattering
angles (few μrad)
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (1/13)ROMAN POT DESIGN (1/13)TOTEM+CMS Detector Configuration
RP1RP1 RP2RP2 RP3RP3
220 m220 m(180 m)(180 m)147 m147 m
~14 m
T1: 3.1 < < 4.7
T2: 5.3 < < 6.5
10.5 m T1T1 T2T2
HF
Symmetric experiment: RPs on both sides!
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (2/13)ROMAN POT DESIGN (2/13)
1. The Roman Pot, an historically proven technique for near beam physics: ISR, SPS, TEVATRON, RICH, DESY
2. A CERN in-house technology: ISR, SPS-UA4, CDF
Primary Vacuum
Detector
Thin window
Beam
Secondary Vacuum
Vacuum Chamber
Bellow
Beam
CERN for CDFCERN for SPS (UA4)
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (3/13)ROMAN POT DESIGN (3/13)
• Very close to the beam operation (10σ ~ 0.8mm)
• Secondary vacuum separation for detectors and cables (no outgassing)
• High mechanical reliability of the thin window on the pot
• Shielding of RF pick-up on the detector/electronics
• High resolution, precision and repeatability of the movements
Constraints/Requirements for TOTEM
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (4/13)ROMAN POT DESIGN (4/13)
Roman Pots are in many aspects identical to the LHC collimators
Movable devices in the LHC beam
Almost the same requirements for vacuum and RF
Close to the beam operation ~ 10σ
Same Engineering Team (TS-MME group at CERN)
Same movements (motors, resolvers, positioning detectors, drivers)
Same controls hardware/software through the LHC Control room
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (5/13)ROMAN POT DESIGN (5/13)
Horizontal Pot : physics, overlap for tracks alignment
Integrated beam position monitor
Interconnection vacuum bellow : bake out and RF
Primary Vacuum
Detector
Thin window
Beam
Secondary Vacuum
Vacuum Chamber
Bellow
Beam
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (6/13)ROMAN POT DESIGN (6/13)
LHC counterflowbeam
Atmospheric pressure
Compensation System
By pass to the machine
vacuum
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (7/13)ROMAN POT DESIGN (7/13)
The Roman Pot unit
• Three measurement pots : two verticals, one horizontal
• Integrated beam position monitor
•Interconnection bellow between horizontal and vertical pots
•Vacuum compensation system interconnected to the machine vacuum
• Individual stepper motors to drive the pots
• Adjustable jacks to align the RP unit in the tunnel
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (8/13)ROMAN POT DESIGN (8/13)2 Roman Pot Units = 1 Roman Pot Station
c
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (9/13)ROMAN POT DESIGN (9/13)
The Roman Pot station in the tunnel
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (10/13)ROMAN POT DESIGN (10/13)
Layout around IP5
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (11/13)ROMAN POT DESIGN (11/13)
Roman Pot Parameters
80
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (12/13)ROMAN POT DESIGN (12/13)
0,000
0,100
0,200
0,300
0,400
0,500
0,600
0,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50
)( h(t) tsftc
The pot and the thin window
Optimal thickness
50mm
124mm
Thin window
Elias Métral, RLC meeting, 02/12/2005
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ROMAN POT DESIGN (13/13)ROMAN POT DESIGN (13/13)
• One Prototype of the Roman Pots has been installed and operated in the SPS during the 2004 runs,
• Installation in the sextant 5, sector 530
• Counting Room on surface in the blg.BB5
• Test Roman Pot mechanics, controls and cooling in a realistic beam environment
• Study RF influence of the beam bunch structure on the silicon detectors and their electronics
• Study trigger capability of the silicon detectors with the VFAT trigger chip.
Counting Room
Access Point
Roman Pot Location
Roman Pot tests in the SPS with coasting beam
Elias Métral, RLC meeting, 02/12/2005
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RF ISSUES (1/2)RF ISSUES (1/2)
Summary
• Beam coupling impedance of RP without ferrites: 1200 ZL/n 18 m @ 740 MHz resonanceQ P 200 W
• Good improvement with ferrites (factor 1/5)ZL/n 3.6 m Q P 40 W
• Ferrites included into the new RP design
Elias Métral, RLC meeting, 02/12/2005
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RF ISSUES (2/2)RF ISSUES (2/2)
Ferrite
Elias Métral, RLC meeting, 02/12/2005
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VACUUM ISSUESVACUUM ISSUES
Synchrotron radiation is the main gas source (referring to a paper by FZ: There is indeed SR in the outgoing line of the beam as well, due to reflection along the beam pipe)
Bakeout (150o C) mandatory NEG coating on the RP chamber (requires activation at 200o C)
Elias Métral, RLC meeting, 02/12/2005
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PLANNING AND INSTALLATION (1/3)PLANNING AND INSTALLATION (1/3)
Elias Métral, RLC meeting, 02/12/2005
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PLANNING AND INSTALLATION (2/3)PLANNING AND INSTALLATION (2/3)
Elias Métral, RLC meeting, 02/12/2005
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PLANNING AND INSTALLATION (3/3)PLANNING AND INSTALLATION (3/3)The installation procedure
Elias Métral, RLC meeting, 02/12/2005
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ATLAS ROMAN POTS AT IR1 (1/3)ATLAS ROMAN POTS AT IR1 (1/3)
Elias Métral, RLC meeting, 02/12/2005
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ATLAS ROMAN POTS AT IR1 (2/3)ATLAS ROMAN POTS AT IR1 (2/3)
Elias Métral, RLC meeting, 02/12/2005
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ATLAS ROMAN POTS AT IR1 (3/3)ATLAS ROMAN POTS AT IR1 (3/3)
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