JIRS Motivation

1
JIRS Motivation

• LARP Joint IR Studies started in FY08,
  extending and bringing together connected tasks
  that were previously situated either in
  Accelerator Systems or in Magnet Systems.
• JIRS tasks were placed under LARP Program
  Management.
• to improve efficiency and communication between
  AS and MS tasks
• provide input for LARP strategic planning
• The framework of JIRS was determined by The
  mission of LARP Joint Interaction Region
  Studies.
• high level mission statements.
• specific goals in Task Sheets

2
LARP IR Studies (2001-2007)

• IR optics for beta-start25 cm (2001-2006)
• Single-bore triplet
• Double-aperture triplet and doublet
• Single-bore IR
• Effect of G and aperture (2001)
• Aperture limitations (2003)
• IRQ design shell-type and block-type (2004)
• Dynamic (field quality) aperture (2004)
• Temperature and operation margin (2002, 2006)
• Radiation heat load (2002, 2006)
• Heat transfer (2007)
• Cryostat quench protection (2007)
• Double aperture IR
• Radiation heat deposition in D1 (2003)
• D1 designs shell, open mid-plane (2003)
• Open mid-plane D1 (2005)
• Double aperture IRQ aperture limitations (2006)

3
JIRS Main Focus (Mission Statement)

• QA - accelerator quality Nb3Sn quadrupole
  suitable for LHC Phase I upgrade
• Define and evaluate a list of potential QA
  locations in LHC in communication with CERN.
• Develop specifications for QA magnets based on at
  least one of the potential locations.
• Examine the possibility of using LQ or HQ designs
  and tooling to build QA.
• Identify bench tests on QA or LQ or HQ to
  demonstrate accelerator quality performance
  (except radiation), to be performed within LARP
  or at CERN.
• QB - Nb3Sn quadrupole prototype for Phase II
  upgrade
• Generate a set of parameters for QB magnets based
  on 1 (or more) upgrade scenarios to guide magnet
  studies, well before CERN states the QB length,
  aperture, gradient and peak coil field.
• Estimate and simulate correction system
  parameters and possible issues in a QB
  implementation.
• Slim magnets - IR magnets inside ATLAS, CMS
  detectors
• Study parameters and operation conditions for
  slim magnets located inside ATLAS and/or CMS.
• Evaluate the usefulness of conventional (NbTi) or
  alternative (Nb3Sn, Nb3Al or HTS) magnet
  technologies in terms of operational margin,
  life-time, etc.

4
FY08 JIRS Tasks and Activities

• 3.3.2 Studies
• 3.3.2.1.Optics Layout - J. Johnstone (Fermilab)
• possibilities and limitations of using Nb3Sn
  quadrupoles in Phase I optics
• IR optics layout with crab cavities
• 3.3.2.2.Magnet Feasibility Studies - P. Wanderer
  (BNL)
• 90-130 mm Nb3Sn quadrupoles for Phase I
• Superconducting D1
• D1-D4 for Phase I-b for local crab cavity options
• 3.3.1 Simulation
• 3.3.1.1 Operating Margins - N. Mokhov (Fermilab)
• Radiation heat deposition, and temperature margin
  of NbTi and Nb3Sn quadrupoles in Phase I optics
• 3.3.1.2 Accelerator Quality Tracking - G.
  Robert-Demolaize (BNL)
• effect of body harmonics in Nb3Sn quadrupoles and
  its correction
• Geometrical harmonics and coil magnetization
• effect of coil ends
• Possibility of using two shorter (4 m) Nb3Sn
  quads in series
• Results
• Presentation to construction project committee
  April 1st

5
Interaction with CERN (Mission Statement)

• Joint IR Studies work must proceed in close
  communication with the AB and AT divisions at
  CERN, with the clear understanding that the LARP
  goal is to pursue magnet RD and to suggest
  magnet parameters, without unduly favoring one or
  another Nb3Sn upgrade design proposal.
• CERN will definitively state upgrade parameters,
  on a timescale that may be informed by, but will
  not driven by, the LARP magnet RD schedule.
• JIRS-CERN communication
• E-mail and phone discussions with Ranko Ostojic
  January
• ABP work packages for phase I from S. Fartoukh
  (draft 17.01.2008)
• Visit to CERN (J. Johnstone and N. Mokhov)
  March-April
• Visit to CERN (P.Wanderer and A. Zlobin) May

6
The future of JIRS discussion

• FY09 LARP WBS does not have JIRS!
• Questions for discussion
• Do we need these activities?
• If the answer is yes,
• Do we understand and agree with the present JIRS
  mission statement, task structure, work progress?
  
• What needs to be changed?
• Alternative approaches?
• How do we see the interaction of these studies
  with CERN (CERN and LARP views)?
• How will we support JIRS in FY09 without budget?

7
JIRS To Do List

• 1. Propose strong justification of Nb3Sn for the
  LHC Phase II upgrade
• Phase I IR upgrade with 120-mm NbTi quadrupoles
  will provide ß25 cm, enough room for absorbers,
  sufficient temperature margin (?)
• 2. Evaluate impact of present Nb3Sn magnets
  limitations
• Field quality
• Limited magnet length
• 3. Develop sound of Nb3Sn accelerator magnet
  technology demonstration and promotion plan
• Nb3Sn IR quadrupole model and prototype
  reliability test
• 4. Investigate possibilities of using Nb3Sn
  magnets before Phase II
• Magnets outside IR
• 5. Support integration of CRAB cavities into IR
  lattice
• optics, separation dipoles, impact on DA, etc.
• 6. Support of IR optics upgrade schemes based on
  slim magnets
• Magnet design and operation conditions,
  technology, interface with detectors

8
Potential US contributions for Phase I upgrade
CM11 in FNAL 27. 28. October 2008
Oliver Brüning/CERN AB-ABP 9
9
Some Recommendations

• The primary mission of JIRS is LARP mission
  support
• Studies in support of program strategic planning
• Present JIRS task structure is consistent with
  the proposed studies.
• JIRS group reinforcement is required
• optics
• simulations
• Personal interest and involvement of LARP Leader
  is critical
• - Serious consideration of JIRS recommendations
• Strong collaboration with CERN
• - serious commitments from both sides