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					SLAC Accelerator Department




  PEP-II B-Factory AIP

    John Seeman
SLAC Operations Review
    June 16, 2004
      SLAC Accelerator Department


                        Past AIP funding
• Accelerator Improvement Project (AIP)
  funding as proposed by the PEP-II staff
  over the years in order to increase the
  luminosity to remain competitive was about
  7000 k$ per year.
• Actual AIP funding for past years:
  –   FY99 = 3715 k$
  –   FY00 = 5800 k$
  –   FY01 = 6188 k$
  –   FY02 = 7100 k$
  –   FY03 = 3300 k$
       SLAC Accelerator Department


     AIP funding has driven PEP-II luminosity increases!

              Peak PEP-II Luminosity (x1E33) per Month
10


 9

 8


 7

 6


 5


 4

 3


 2

 1


 0
               Dec-99




                                 Dec-00




                                                   Dec-01




                                                                     Dec-02




                                                                                       Dec-03
     Jun-99




                        Jun-00




                                          Jun-01




                                                            Jun-02




                                                                              Jun-03
    SLAC Accelerator Department


 SLAC AIP Changes between Funding Plans
• The SLAC Field Task Proposal (April 2004) used
  the following funding profile for AIP: FY05-
  FY09: 8M$, 8M$, 7M$, 6M$, 6M$.
• The Lehman review proposed AIP funding profile
  for the “Base 2%” case (June 2004) : FY05-FY09:
  6M$, 6M$, 6M$, 6M$, 6M$.
• The Lehman review proposed AIP funding profile
  for the “Flat-Flat” case (June 2004): FY05-FY09:
  6M$, 6M$, 5M$, 4 M$, 3 M$.
• The details of these three cases are shown below.
    SLAC Accelerator Department


           Changes in AIP Work Scope
• To get from the Field Task Proposal to the
  Lehman “Base 2%” case:
  – One PEP-II RF station was delayed from 2005
    to 2006 installation.
  – The bunch shortening cavities in the HER were
    eliminated. (Reduces the PEP-II overall peak
    luminosity from 2.4E34 to about 2.2E34.)
  – Some PEP-II vacuum work was delayed which
    delays achievement of the ultimate peak
    luminosity.
  – Some non-PEP-II work was delayed.
    SLAC Accelerator Department


          Further changes in AIP Scope
• To get from the Lehman “Base 2%” case to
  the Lehman “Flat-Flat” case:
  – Some PEP-II vacuum work was delayed by a
    year from 2007 to 2008.
  – Some PEP-II magnet, feedback, and diagnostic
    work was delayed from 2007 to 2008.
  – Many non-PEP-II items were delayed.
• It is assumed that the early year PEP-II
  upgrades and people are “protected” except
  for the above.
        SLAC Accelerator Department


AIP Upgrades from SLAC Field Task Proposal April 2004
Fiscal Year   PEP-II       PEP-II     PEP-II         Linac, DR,   Total
              Radio-       Vacuum     Magnet, PS,    Gun, BSY,    (k$)
              Frequency    System     Instruments,   FFTB, PPS
              RF System               Feedback
2003          2234         300        766            0            3300


2004          2948         1396       2356           100          6800


2005          4900         2230       670            200          8000


2006          3465         2850       1585           100          8000


2007          1900         1800       2065           1235         7000


2008          1000         500        600            3900         6000


2009          0            0          0              6000         6000
        SLAC Accelerator Department


 AIP Upgrades for SLAC Lehman “Base 2%” June 2004
Fiscal Year   PEP-II       PEP-II     PEP-II         Linac, DR,   Total
              Radio-       Vacuum     Magnet, PS,    Gun, BSY,    (k$)
              Frequency    System     Instruments,   FFTB, PPS
              RF System               Feedback
2003          2234         300        766            0            3300


2004          2948         1396       2356           100          6800


2005          3248         1980       772            0            6000


2006          3332         1413       1255           0            6000


2007          1813         2537       1365           285          6000


2008          1087         500        500            3913         6000


2009          0            0          0              6000         6000
        SLAC Accelerator Department


  AIP Upgrades for SLAC Lehman “Flat-Flat” June 2004
Fiscal Year   PEP-II       PEP-II     PEP-II         Linac, DR,   Total
              Radio-       Vacuum     Magnet, PS,    Gun, BSY,    (k$)
              Frequency    System     Instruments,   FFTB, PPS
              RF System               Feedback
2003          2234         300        766            0            3300


2004          2948         1396       2356           100          6800


2005          3248         1980       772            0            6000


2006          3332         1413       1255           0            6000


2007          1813         1837       1065           285          5000


2008          1087         1200       800            913          4000


2009          0            0          0              3000         3000
     SLAC Accelerator Department


            Integrated PEP-II Luminosity
• The PEP-II integrated luminosity for each of the three AIP
  funding profiles was calculated month by month including
  the expected down times, turn-on schedules, and
  anticipated peak luminosities.
• The peak luminosity for each year was determined by the
  available installed hardware.
• A listing of the integrated luminosity by year is shown in
  the table below.
• These projections assume that the PEP-II staff for
  operation, maintenance, engineering, and construction
  remain at current levels.
• In summary: The “Base 2%” case reduces the overall
  integrated luminosity by about 8% compared to the Field
  Task Proposal and the “Flat-Flat” case an additional 2%.
       SLAC Accelerator Department


PEP-II Delivered Integrated Luminosity under Various Plans

Delivered as of    SLAC Field        SLAC Lehman   SLAC Lehman
end of fiscal year Task Proposal     “Base”        “Flat”
FY2004             253 /fb           253 /fb       253 /fb

FY2005             392               392           392

FY2006             545               534           534

FY2007             855               802           802

FY2008             1216              1130          1106

FY2009             1577              1462          1432

FY2010             1939              1795          1764
     SLAC Accelerator Department


                           Conclusions
• AIP projects have provided the hardware
  opportunities to successfully increase the
  luminosity in PEP-II over the past years.
• Future AIP project money is important for
  continued luminosity improvement of PEP-II.
• With potential future reductions in the AIP
  funding, accelerator projects (and the associated
  luminosity gains) will likely be delayed to later
  years.

				
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