Subject: Time: 3:47 PM OFFICE MEMO PET minutes 12/20/96 Date: 12/20/96 To: RFQ/PET Distribution From: Ralph J. Pasquinelli Subject: Meeting Notes 12/20/96 Lab G It would be very desirable to keep the RFQ and ion source under vacuum over the holidays. Kris Anderson will set up a meeting time today to see if SAIC staff can be in over the holidays to check on the vacuum system. The other alternative is to let the system up to inert gas such as Argon. The accelerator will be put in stand by for the holiday and should not be turned on until Jan.2, 1997. It was decided to tag out the RF systems which means the water and filaments could be turned off as well. Note turbo chiller water must stay on if we keep the system under vacuum. Nancy Grossman has made up lock out tags. The 4616 ion pump will remain on. Ion Source The ion source has now run continuously for over a week at a very stable current in excess of 20 mA. Chuck Schmidt presented the emittance data that was taken at the ion source output and at 1 MeV. The unnormalized emittances for the ion source are 230-250 pi mmmr, for the 1 MeV beam 35-38 pi mmmr, both for 90% beam. Chuck will prepare a schedule of work that needs to be performed for the ion source over the next few months. This work will be incorporated into the schedule for installing MEBT and RFQ's. Some of the items include adding ventilation holes and filters to the ion source relay rack, and the relocation of the gas bottles closer to the source itself. Beam Optics/Magnets/Solenoid The HEBT magnets are being tested at MTF. The quadrupole has developed a water leak. It is expected that the magnets will be completely tested and repaired after the holiday break. John Palkovic will keep up on progress. Frank Bieniosek will set up a meeting to discuss the extra power supplies that are required for the electron traps and the steering windings on the MEBT quads. Bob Vargo has completed the windings and they have been magnetically tested. All new power supplies should be in procurement by the end of January. The MEBT trim quad mounting brackets are being manufactured and should be ready for installation in early January. The correction dipole in the MEBT is being manufactured by SAIC in San Diego. All feed thru's to the MEBT box should be capable of handling the required current. RFQ The 4 vanes for either RFQ A or B have been delivered to Fermilab. Ding Sun and Steve Ringler have performed an inspection and found some damage. It appears to be a combination shipping damage and mishandling. Steve should contact the vendor and ask that subsequent shipping containers be mark "Fragile". There have been more plating problems with the RFQ C housing and it is being reworked for the third time. The 212 MHz RFQ vanes are 3-4 weeks from completion of fabrication. Steve Ringler needs to check the contour data with Ding Sun. It will be February before new 212 vanes are delivered. New pickup RFQ loops will be designed by Ding and put into the four quadrants of the RFQ. This does not require machining of the vane housing, but will require some machining of flanges for feed thrus. Brian Chase will assist with the design and ask Rene Padilla of RFI to help fabricate the loops. Kris Anderson is still waiting for the gun drilled aluminum test piece that will be used to test nickel plating to reduce future corrosion problems in the new RFQ vanes. Charge Stripper Frank Bieniosek reports that initial charge stripper tests have begun. The single fuel injector gas jet has been successfully run at 360 Hz and an initial stripping efficiency of 50% has been measured. Frank and Kris Anderson plan on continuing gas pressure testing as the new stripper is very different from the prototype. Initial feelings are that the nozzle and geometry of the jet may need redesign to improve stripping efficiency. Diagnostics All diagnostics required for the stripping tests have been installed and commissioned. Bob Webber indicated that all the hardware to build up the signal processing electronics for the diagnostics are in house. Complete modules will roll off the assembly line by mid January. All of the MEBT diagnostics are ready for installation. Steve Ringler needs to design the holders for the split Faraday rings that will replace the profile monitors. Low Level RF/High Level RF Bob Webber and Brian Chase have been steadily working on increasing the gradient in the 212 RFQ. A plot of beam current versus power was performed and at 80 KWatts, the slope increases steeply. Eight to ten milliamperes of beam current have successfully been accelerated to one MeV. The 4616 tetrode on the 212 RF station was replaced with a rebuilt tube. More stable operation of the system has been experienced since the change. All RF stations with the exception of RFQ C have been calibrated. Joe Dey will see that the last station is done early in January and continue with the calibration of the test signals that connect the RF stations to the LLRF rack front panel. Interlocks Dave Peterson has received the flashing lights for "RF on" indicators. Bob Vargo will install the four units on top of the main RF station relay racks. Dave will also meet with Chuck Schmidt to specify and replace the existing ion source interlock chassis. The chipmunk interlock hardware is already an approved safety device here at FNAL. FNAL approval for the vault interlock system is pending. Interlock documentation has been sent to Jerry Bida for submission to the Louisiana state regulators. Vacuum The turbo controller for the spectrometer pump has a read back problem that needs to be fixed. The analog to digital converters in the PLC do not read back the new thermocouple chassis channels. A meter in the new chassis has failed and requires replacement. New solid state relays are being procured for the roughing pump AC circuits. The rouging pumps are drawing twice the current expected due to the specification current data was for 220 VAC. We operate the pumps on 120 VAC. The gas bottle "farm" should be ready for installation by the third week of January. This gas system will have four circuits, one each for valves, vent, stripper and RF system. The pneumatic lines along the accelerator can be installed at any time. Radiation Shielding and Safety Nancy Grossman has relocate the chipmunks for the stripping tests. No measurable x-ray radiation has been seen outside the 212 RFQ vacuum vessel except near the top turbo pump and that was less than 0.5 mrem/hour. Measurements have been made at the 80 KWatt level. Nancy has done an extrapolation using x-ray data that shows dependence on the fifth power of voltage, tenth power of RF power. She estimates that further x-ray testing will be required at the 100 KWatt level. Jeff Johanning has placed orders for the HEBT vault wall shielding materials. He will keep tabs on the order and expedite if necessary. The vault door is in the final design stage and will be ordered at the beginning of the new year. Target Windows Richard DeHaas is starting to receive bids for the tantalum beam stop in the HEBT. He is continuing to design the collimator jaws for the HEBT. Water Systems Bruce Hoffman indicated that the outdoor chiller was shipped dry and is not in any danger of damage due to freezing. Bruce has obtained the water manifolds that will be used for the MEBT and HEBT. There has been a delay in getting pipe fitters to hook up the water system. A number of emergency water problems have surfaced in other parts of the laboratory that have priority. It is still hoped to have the system plumbed by the end of January 97. Power Supplies/Electrical Most of the power supply control wiring has been completed. The remainder of the job requires the magnets to be installed and wired. Obie has all of the required wire. MEBT installation is expected to begin the second week of January. As mentioned earlier above, Frank Bieniosek will coordinate the effort to obtain all necessary power supplies that have not yet been procured. The klixons on the solenoid have not yet been rewired to operate on 24 volts. This work could be performed during MEBT installation. Controls/Software Duane Voy has developed Lab View pages for reading out the profile monitors and the four segment Faraday rings. John Palkovic has Lab View software for the ion source that should be tested by Chuck Schmidt and Milorad Popovic. Bob Webber has been utilizing the data logger and finds it to be quite useful. It still has a number of bugs and is not that user friendly yet. More people should be using it and bringing suggestions to Elliott McCrory. The Sun computer has had more memory and disc space added. Bob Florian will look into finding another temporary Macintosh capable of running Lab View. Administrative Neatness counts! Your grade school teachers told you this all the time, and they were absolutely correct. I want everyone to be aware that neat installation is required if we intend to take this machine apart and put it back together again. You cannot be in such a hurry now because we can't ship this beast if we can't take it apart safely and quickly later this spring. I suggest that cables and hoses be dressed out neatly during the many installation down days that are scheduled for the coming months. The Phase II&III collaboration meeting in Shreveport last week emphasized the need for an operation plan that fits into the remaining budget. BRF and SAIC are working out a staffing plan that will support the 24 month chemistry effort. They will keep FNAL and UW in the loop. The next meeting will be Friday January 10, 1997, at 10 AM in the penthouse. RJP