PEP-II B-Factory AIP

1. PEP-II B-Factory AIP John Seeman SLAC Operations Review June 16, 2004

2. 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$

3. AIP funding has driven PEP-II luminosity increases!

4. 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.

5. 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.

6. 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.

7. AIP Upgrades from SLAC Field Task Proposal April 2004

8. AIP Upgrades for SLAC Lehman “Base 2%” June 2004

9. AIP Upgrades for SLAC Lehman “Flat-Flat” June 2004

10. 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%.

11. PEP-II Delivered Integrated Luminosity under Various Plans

12. 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.