APEX Overview

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APEXOverview

• Fulvia Pilat

APEX Workshop Science Education Center, November
2-3 2006
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Outline

• Goals (recall)
• Run-6 Stats and studies
• Program organization issues
• AEAC grading system
• (intentional) beam loss WEB form OPM 2.11
• APEX end effects (injectors, back2physics)
• explicit beam requests
• APEX spin-off
• operations, publications
• Preparation for Run-7
• program, proposals, AEAC, priorities

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APEX goals, recall

• GOALS
• Improve machine performance (longer time scale
  than now machine performance) - Class1
• support ERTAF, RHIC upgrades (RHIC-II, eRHIC)
• Development of beam diagnostics techniques
• Inter-lab collaborations
• Class 2 experiments general accelerator physics
  
• or for other projects (strictly none so far, WF
  will discuss
• one proposal)

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APEX statistics

• Run-5 Cu 9 (7 HE 2 LE) physics weeks
• Run-5 PP 10 physics weeks
• Run-6 PP 13 physics weeks

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APEX Run-6 1

• Studies focused on BPMs
• Beam-based alignment (Niedziela, Satogata)
• full data set taken, analysis in progress
• Orbit response matrix (Satogata, Niedziela)
• full data set taken, analysis done (?talk
  Todd)
• Auto-trigger vs. fixed trigger (Michnoff) (?talk
  Rob)
• tests

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APEX Run-6 2

• Operations related
• Beam-based sextupole polarity check (Luo)
• worked well, checked all sextupoles
  (operational now)
• Optics measurements with AC dipole (Bai)
• worked well, measured betas at all IPs
  (?talk Mei)
• Comparison rotator settings with model (MacKay)
• verification of rotator model
• Rotators at injection (MacKay)
• established possibility of ramping rotators to
  1/2 current a injection if needed
  (?talk Waldo)

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APEX Run-6 3

• Nonlinear dynamics
• Measured 2nd order chromaticity (Tepikian et al)
• operations now ( ? talk Yun)
• Measured skew chromaticity (? talk Steve)
• 2/3 resonance measurement and correction at
  injection (Bengtsson, Luo et al)
• use driving terms, difficult so far (?talk
  Johann)
• Operational 2/3 resonance correction (Calaga, et
  al)
• look at beam decay directly worked in yellow
  but not consistently

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APEX Run-6 4

• Instrumentation and developments
• Calibration tune, emittance and chromaticity
  measurements (Cameron, Connolly, Brown, etc.)
• RF phase modulation chromaticity measurement and
  calibration (Cameron et al) did not work well
• BTF and BBTF measurements with BBQ (Cameron)
• ?operational now (?talks Wolfram, Peter)
• PS balancing (Cameron, Schultheiss)
• in progress (? talk Peter)

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APEX Run-6 5

• PS ripple (Brown with Schottky, Cameron with BBQ)
• effort started with LF Schottky
• with BBQ measured an effect at the 10-4 level,
  considerably larger than expected (?talk Kevin)
• Stochastic cooling preparation (Brennan,
  Blaskiewicz)
• kicker alignment, etc. ?continued in operations
• 10 Hz orbit feedback (Montag)
• continuing in development (?talk Christoph)

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APEX Run-6 6

• Beam-beam
• Long range beam-beam (Fischer et al)
• goal establish feasibility of long range
  beam-beam measurements for compensation (LARP)
  not trivial to measure (? talk Wolfram)
• Beam-beam, only 1 IP (Montag et al)
• relevant for operations and eRHIC plans
• repeated, consistent dependence of beam lifetime
  with intensity of incoming beam

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APEX Run-6 7

• SPIN studies
• Snake resonances (Bai et al)
• Completed, study of snake resonances in blue and
  yellow. Interesting results. (? talk Mei)
• Spin tune measurements (Bai et al)
• attempted a few times because of technical
  glitches
• measurement done (? talk Mei)
• Polarization vs. source polarization (Huang,
  Zelenski)
• (? talk Haixin)
• Spin decoherence (MacKay)
• experiment rescheduled for next year (? talk
  Waldo)

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APEX Run-6 8

• High intensity studies (Zhang Huang)
• E-cloud, emittance
• (?Talk SY)

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Organizational issues

• Review and prioritization criteria (AEAC)
• Studies with intentional beam loss
• WEB form OPM 2.11
• APEX end effects (injectors, back2physics)
• explicit beam requests add detailed request for
  beam conditions in the scheduling for APEX to
  allow for optimum operation support

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AP Experiment Categories (old)

• Class
• 0 likely to immediately benefit RHIC
  machine performance, or crucial to RHIC hardware
  decision making
• 1 directly benefiting RHIC machine
  performance
• 2 benefiting general accelerator
  community
• Priority
• A a) benefiting RHIC operation b)
  well prepared and c) likely to succeed
• B has at least two of the above
• C has at least one of the above
• D has none of the above
• NEED TO STREAMLINE THIS ? AEAC Committee
• Peer review in place
• APEX Experiments Workshop
• APEX Weekly Meeting

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AP Experiment Categories (new)

• Class
• 0 likely to immediately benefit RHIC
  machine performance, or
• crucial to RHIC hardware decision making
• 1 directly benefiting RHIC machine
  performance
• 2 benefiting general accelerator
  community
• Priority
• A MUST DO
• B Recommended
• C Considered
• D Declined
• Priority is assigned by AEAC Committee
• The AEAC will not distribute a written record of
  deliberations, only the final outcome. However it
  will be available to discuss the outcome if
  requested by the experiment spokespersons

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Studies with intentional beam loss

• On the APEX form
• Revised (APEX) OPM 2.11, approved now ? read and
• acknowledge by ALL experimenters

Field to input the observation/authorization from
RSC Chair
Beavis, or
After the experiment
spokesperson
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APEX End effects

• Before maintenance days
• injectors will go offline at 6AM
• Ramp will be reverted and systems reset just
  after APEX
• APEX experimenters are responsible to leave the
  system operational, and will be available for
  consultation if needed when operations are
  restored after maintenance
• On non maintenance days
• 1 h will be allocated (as always) for back to
  physics operations
• Before the end of the run
• APEX will present earlier an explicit end-plan
  with priorities (request from Retreat)

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APEX Spin-offs

• Run1-Run3
• IR corrections skew quadrupole (IR coupling)
• Chromaticity measurement on the ramp, radial
  wigglePLL
• Octupoles around transition
• PLL, feedback, high resolution tuning
• Tune scans in collision ? working points
• Run-4
• IR corrections (across IR, sextupole, octupole)
• Tune scans (store, injection) ? working point
• AC dipole, optics measurements (coupling in
  progress)
• Pressure rise ? confirm NEG pipes, solenoids
• Beta squeeze ? beta85-90cm in Phenix, Star
• Decoupling via skew modulation

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APEX Spin-offs

• Run-5
• Decoupling on the ramp
• AC dipole (coupling)
• Local beta squeeze (Brahms)
• IR corrections skew sextupole
• JET optical emittance measurement
• BBQ developments
• stochastic cooling
• Run-6
• Sextupole polarity checks
• 2nd order chromaticity
• BTF technique and application
• Beam-based alignment
• ORM
• AC dipole optics
• Orbit feedback

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APEX Spin-offs my wish list for
Run-7(discussion?priorities)

• Linear optics corrections
• Resonance corrections
• Schottky
• Demonstration of IBS lattice
• AC dipole ?non expert system
• BBQ ? less expert system

APEX Spin-offs publications
List of all papers, conference proceedings,invited
talks generated by APEX DEADLINE NOVEMBER 30
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Prep for Run-7

• Deadline APEX Pubs November 30
• Deadline APEX Proposals December 15
• AEAC end December
• (the latter 2 contingent on beginning of the run)

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