Proton Plan Director’s Review 8/15/06 Prebys Proton Plan Answers to Questions Director’s Review August 2006 Eric Prebys.

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Presentation transcript:

Proton Plan Director’s Review 8/15/06 Prebys Proton Plan Answers to Questions Director’s Review August 2006 Eric Prebys

Proton Plan Director’s Review 8/15/06 Prebys Questions 1 How many 7835 Amplifier tubes have been tested and meet specs? What is the plan for completing the testing.  Our testing so far has been keeping pace with our need to replace tubes  At the moment, we have 20 tubes, of which five have been tested. (Three of the new tubes have already been installed)  Yield has been extremely good in recent years. Only one new tube was returned for a bad ion pump. It has since been returned and tests fine.  Testing was slowed by the retirement of a key Technician. We have an offer out to a replacement, and it is believed that will allow us to increase the rate of testing.  We are also considering assembling a second test stand.

Proton Plan Director’s Review 8/15/06 Prebys Questions 2 Regarding the Linac RF, is the “feed forward” technology well enough understood to proceed with it now if so decided?  Defer to RF people

Proton Plan Director’s Review 8/15/06 Prebys Questions 3 Report (quantitatively) on the benefits of the work accomplished during the Booster  As we said, we were very methodical in coming up after the shutdown, and we are only now hitting the hourly rates that we were at before the shutdown.  Nevertheless, there are many indications that we have improved machine operation

Proton Plan Director’s Review 8/15/06 Prebys Question 3 (cont’d) Orbit relative to injection This was roughly 1 cm prior to shutdown

Proton Plan Director’s Review 8/15/06 Prebys Question 3 (cont’d) Batch size -> E12 5E E12 5E12 Efficiency (High is good) Normalized Energy Loss (low is good) 85% 20 J/E12 January June

Proton Plan Director’s Review 8/15/06 Prebys Question 3 (cont’d) Normalized radiation dose MiniBooNE NuMI Factor of ~15 in total proton rate

Proton Plan Director’s Review 8/15/06 Prebys Question 3 (cont’d) RF Regions

Proton Plan Director’s Review 8/15/06 Prebys Question 4 Do the test of the Booster corrector prototype magnet show it meets requirements  So far yes, unless the AC measurements hold unpleasant surprises.

Proton Plan Director’s Review 8/15/06 Prebys Question 5 Talk to the accelerator physics work that justifies what steps are being taken.  This is an area we are working to improve  In the Booster, we have a fairly accurate longitudinal model, which has driven our decision to cancel the 30 Hz harmonic and pursue the gamma-t system, for example  The transverse model does not quantitatively reproduce beam loss.  Our assumptions to date are strictly based on reduced scraping due to effectively increasing the aperture by reducing uncontrolled beam motion, which we believe has dominated our losses up until now.  The suggestions to look at other machines (particularly as to the effects of tune control) are appreciated.

Proton Plan Director’s Review 8/15/06 Prebys Question 6 Is the gamma-t jump decision ever going to be made?  Fair question, however…  More work has gone into understanding the gamma-t system in the last year than in probably the decade before.  Simulations look very compelling, so at the moment the assumption is that we are proceeding with the system.  Still some important problems to work out Beam position at transition Effect on coupled bunch instabilities Transition phase jump “subtleties”  Getting close to definitive test

Proton Plan Director’s Review 8/15/06 Prebys Question 6 (cont’d) J. Machlachlan, FNAL-BEAMS-DOC-2339-v1 (.3 unit) Out of 84 bunches

Proton Plan Director’s Review 8/15/06 Prebys Question 7 Describe MI collimation thoughts…  Defer to Ioanis  MI conceptual collimation review talks and committee report available at:

Proton Plan Director’s Review 8/15/06 Prebys Question 8 Speculate on (or remind us of) any hopes for benefits before the end of the 2007 shutdown  Our projections for NuMI only assume they will run (with more up time) in 2+5 mode as they were before the shutdown: A few percent increase in Booster batch size is projected, but this is small compared to the up time issues.  It is planned that the MI will have at least demonstrated full 2+9 operation at some intensity. Beam loss will determine whether we use it operationally prior to the collimation system.  The total Booster output is projected to increase by at least 20% due to the improvements made during the shutdown. This extra beam will go primarily to MiniBooNE.