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					                Recent Activities
• Scheme for reducing beta and dispersion
  beating in the Main Injector
• MI collimation efforts
• Proton Driver efforts
• MI Wide aperture quad efforts




July 26, 2006      Dave Johnson    AP Dept   1
                           Meeting
    Scheme for reducing beta and dispersion
         beating in the Main Injector




                Current                             New




• Utilize trim coils in IQC and IQD quads to better
  match dispersion and lattice functions
July 26, 2006             Dave Johnson    AP Dept         2
                                  Meeting
       Scheme for reducing beta and dispersion beating
                     in the Main Injector
Q638       IQC
                 IQCF   IQCD   IQDF   IQDD
                                             Q338       IQC
                                                              IQCF   IQCD   IQDF   IQDD
                                                                                          • IQC(100”) 4 turns main, 16
                                                                                            turns trim, 2.3 W , 20 mH
Q639                                         Q339
Q640                                         Q340
Q641                                         Q341
Q100       IQC                               Q400       IQC


                                                                                          • IQD(116”) 4 turns main, 16
    mi10                                         MI40
Q104       IQC                               Q404       IQC
Q105                                         Q405


                                                                                            turns trim, 2.8 W , 23 mH
Q106                                         Q406
Q107                                         Q407
Q108       IQC                               Q408       IQC




Q216       IQC                               Q516       IQC
                                                                                          • WQB 7/18 turns
                                                                                          • Create 4 circuits for the trim
Q217                                         Q517
Q218                                         Q518
Q219                                         Q519
Q220       IQC                               Q520       IQC

Q223
Q224
    MI22
           IQC                               Q523
                                             Q524
                                                 MI52
                                                        IQC                                 coils IQCF, IQCD, IQDF, and
Q225
Q226
Q227       IQC
                                             Q525
                                             Q526
                                             Q527       IQC
                                                                                            IQDD
Q229
Q230
           IQC                               Q529
                                             Q530
                                                        IQC                               • Largest current in trim coil 11
Q231
Q232
Q301       IQC
                                             Q531
                                             Q532
                                             Q601       IQC
                                                                                            amps
                                                                                          • Required voltage < 1000 V ->
    MI30                                         MI60
Q309       IQC                               Q608       IQC
Q310                                         Q610
Q311
Q312
Q313       IQC
                                             Q611
                                             Q612
                                             Q613       IQC
                                                                                            Ling supply (we have)
Q315
Q316
Q317
           IQC                               Q615
                                             Q616
                                             Q617
                                                        IQC
                                                                                          • Settings could be included in
Q318
Q319
    MI32
           IQC
                                             Q618
                                             Q619
                                                 MI62
                                                        IQC                                 I2
Q322
Q323
Q324
           IQC                               Q622
                                             Q623
                                             Q624
                                                        IQC
                                                                                          • Currently for 8 Gev, can it be
Q325
Q326       IQC
                                             Q625
                                             Q626       IQC                                 extended to 120 Gev ?
                                                                                          • MTF measurements on
                                                                                            IQC/IQD trim coils

    July 26, 2006                                                    Dave Johnson    AP Dept                              3
                                                                             Meeting
                MI collimation efforts
     – Participate in MI Simulation and Collimation Design
       meetings (Bruce Brown, Sasha Drozhdin, Ioanis Kourbanis, Kiyomi
         Seiya, Ming-jen Yang, +others)
     – Created a single stage collimation scheme using a
       dynamic dispersion
     – June 30th review ->
                   »   develop 2 stage collimation
                   »   Introduce safety margin X2 or 3
                   »   Optimize placement of collimators
                   »   Parameter sensitivity studies
                   »   MI beam studies (loss vs tune, NL x, lattice errors, install
                       test primary/secondary for simulation comparison)




July 26, 2006                  Dave Johnson    AP Dept                                4
                                       Meeting
                Single stage collimation




                   V301          V303
                                                  ECOOL
                      K




                                                                     Kicker 309
                          H302          H304




                                                           Lam 308
                                               Q305                               H308

Vertical collimator/absorber
Horizontal collimator/absorber
Secondary mask (outside beam pipe) Trim coils either side of straight section
                                   Trim quads in straight section
                                   4 trim coil circuits in ring (for matching)
                                   Requires heavy metal absorbers
July 26, 2006                    Dave Johnson    AP Dept                                 5
                                         Meeting
    Loss Comparison of collimation schemes
                                           June 30, 2006
                                             A.Drozhdin




July 26, 2006    Dave Johnson    AP Dept              6
                         Meeting
                Proton Driver Efforts
     – Continued optimization of injection layout
     – Conceptual Design of injection absorber in
       conjunction with Igor Rakhno
     – MOU with BNL
           • Laser profile monitor
           • CDR Review
           • Optimization of foil stripping injection




July 26, 2006              Dave Johnson    AP Dept      7
                                   Meeting
                 Injection Lattice

                                                  Current MI-10




                                                    H-
• Flexible beta at foil
• Zero (Small) Dispersion in straight                    38 m
• 6 new quad circuits
• Power IQC/IQD trim coils in
  reminder of ring (with QF & QD) for
  tune control ->MTF measurements
• Minimal beta function distortion          MI-10 for H- Injection
July 26, 2006           Dave Johnson    AP Dept                      8
                                Meeting
                        Injection layout
• Fixed Chicane bump                                           558G 1.2T
• Phase space painting                                  Foil in front on 1.2T field
• Flexible injection optics in
  transport and ring                                      H-                            foil
• Zero (small) dispersion in                                                  H0 , H-     H+
                                                                                                     inj absorber


  ring and transport line                       start


• Parallel beams in ring and
                                                                                               end


  transport line @ foil (a = 0)
• HB3 dipole separates H+, H0                                  closed orbit
                                                               (DC bumps)

• Utilize HB3 fringe field
    – for prompt conversion of                                    Painting trims
      excited H0 (n>=2) to                                     38 meters
      protons (foil on rising field)
    – Lorentz stripping of H-
      missing foil (lifetime ~E-11
      s)
• Modification of MI
    – Allowed this design to
      proceed
 July 26, 2006                  Dave Johnson    AP Dept                                                      9
                                        Meeting
    Conceptual Design of Injection Absorber




                           Model/MARS calculations by: Igor Rakhno
                       • Assumed intensity 5E12/sec
                         (1E20/yr)
                       • Eliminate need for new civil
                         construction
                       • Utilize graphite core with contoured
                         W shield, external Fe, and
                         concrete/marble
                       • Max stars 4E-9 s/ml/p limit 8E-9
                         s/ml/p
                       • Next steps: optimize position, ANSYS
                         calculations
July 26, 2006    Dave Johnson    AP Dept                       10
                         Meeting
    MI Wide aperture quad efforts


                10
                mm

                       20
                      beam

                     40
                     mm




                                                    Picture from: Weiren Chou
July 26, 2006             Dave Johnson    AP Dept                        11
                                  Meeting
                               MI Wide aperture quad efforts
       12
                 MI522 scan
                                           I:LN521B                 BEFORE                                   •   MI52: replace Q522 (IQE->WQB), Q521
                                           I:LN522A
       10                                  I:LM522B                                                              (IQB->IQE), elliptical BP w/6”round
Loss, volts




         8                                                                                                       between 521&522)
         6                                                                                                   •   Blue curve (LM522B) loss monitor on
         4
                                                                                                                 quad:
                                                                                                                 – Field-free region increased increased by
         2
                                                                                                                   ~7 mm (due to WQB)
         0
          -60            -40         -20         0       20        40        60        80        100             – Field region saturated due to Lambertson
                                                         (mm)                                                      field being ON
                 12
                        MI522 scan
                                                 I:LN521A
                                                 I:LN521B
                                                 I:LM522B
                                                                        AFTER                                •   Red curve (LN521B) Entrance to LAM52A
                 10
          Loss, volts




                                                                                                                 – constant in field free region
                   8
                                                                                                                 – Increased in field region due to Q521 and
                   6                                                                                               beam pipe replacement
                   4                                                                                         •   Gold/Green curve (LN521A) downstream
                   2                                                                                             Q521 on beam pipe
                   0                                                                                             – Loss went away due to Q521 replacement
                   -60         -40         -20       0        20        40        60        80         100
                                                              (mm)
                        After WQB data: Ming-Jen Yang
                        July 26, 2006                                                       Dave Johnson    AP Dept                                      12
                                                                                                    Meeting

				
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