Agenda
|
Time (CST) |
Dur (min) |
Lead |
Topic |
|---|---|---|---|
|
Installation |
|||
|
3:00 |
5' |
Call setup |
|
|
Chuck Brown |
BEAMS |
||
|
Mike Heffner |
Beam CKOV |
||
|
Jim Ellermeier |
Magnets |
||
|
Bob Wands |
JGG Fringe Field Analysis for CKOV Cart |
||
|
Mark Messier |
RICH |
||
|
Gary Smith |
NCAL Stand Drawings |
||
|
Raja |
Chamber Readout Plan |
||
|
Bob Wands |
Rosie Fringe Field Analysis for TOF |
||
|
Virgil Bocean |
Floor Survey |
||
|
AOB |
|||
Leon Beverly's meeting summaries in italics.
BEAM - Beamline
Chuck is developing a beam sheet as he has not found any historical record. Chuck also notes he is going to install a 90 degree monitor at the primary target. A monitor that may be needed for future experiments.
Opening of the MC target pile may begin as soon as April 22nd.
UBL - Upstream Beamline Detectors
Beam CKOV
Per Jim Kilmer, Larry Spires will produce a document indicating what needs to be done to convert the manually operated CKOV to remotely controlled, and how to interface with camac.
TGTW - Target Wheel
CTGT - Cryogenic Targets
NTGT - NuMI (MINOS) Target
Ron Soltz:
DAQ:
2 ppc modules ordered and in hand at LLNL
Currently testing boot sequence with linux kernelTPC:
Planning return trip to LBNL to pickup components and documentation
Resumption of readout tests await current DAQ workRon Soltz reports progress on the DAQ system. He expresses a desire to power the TPC in MC7 about the end of May.
Jim Kilmer has enough information to begin design of equipment needed to handle the TPC for insertion and removal from the JGG aperture.
Sign-off on installation procedures will begin this week.JGG - Jolly Green Giant
From the bottom of the bottom steel of Rosie [should be in reference to JGG?] to the center line is 68 1/2". The surface of the bottom of the bottom steel is irregular by 1/4" to 3/8". Therefore, if we shim the base steel to 1/2", which sits on top of a 12" base concrete slab, the beam height will be 81" &endash; and increase of 1/2" from past discussions.
Rosy
Ingrid Fang:
CKOV Stand - The inner frame design is completed. The remaining work includes the outer frame connection and the cart itself. Gary can start to make drawings for the inner frame.
The inner frame design is ready for drawing - Gary will draw.
Bob Wands calculated the force on the base support of CKOV due to the fringe field of JGG is only about 10 pounds. Therefore, there is no need to change from steel to stainless steel for base fabrication. The steel base will be anchored to the concrete floor.
Testing continues at Lab 6.
Tim Bergfeld:
First, the DOE stockpile application is in. Maybe we'll actually get money to build the TOF.
We have received the fringe field maps from Bob Wands. I will be getting back in touch with him for some more information but the results look like we will have a 100 Gauss field in the region of the phototubes. Also I have asked Pat Richards to give a count of the small 31mm phototubes available in Lab 6. There are about 130 of these tubes. Not quite enough for 100 bars of scintillator.
We have used a small piece of new scintillator(BC408) from Saint-Gobain to compare the light output of the old CLEO scintillator with new scintillator. We see 60% increase in the light production with the new scintillator. The measurement was taken with a requirement that the cosmic passed within 1in of the end of the bar so attenuation length should no be a component of the difference. If we can use new scintillator we should be able to get a 30% improvement in the timing resolution.
Finally, we have ordered new 2inch phototubes with very good timing properties and these should arrive Thursday. We have also ordered a sample of UVT plastic for the creation of light guides to collect more of the light from the scintillator into the phototubes. We are also starting the process of getting some new scintillator bars for testing as well. Note we are not ordering the full detector quantities at this time.
The fringe field in the vicinity of the TOF due to its proximity to Rosie is 100 gauss.
Waiting on a quote for stand procurement.The cooling unit for RICH electronics needs chilled water. The HV voltage supplies contribute 1kW of power. In the E781 run, the electronics contributed 2kW of power. Re-design of electronics will reduce the 2kW to (?), a low number.
Ingrid Fang:
I just received the part drawings this morning [Wednesday April 10, 2002]. I have not had time to check them yet. If the beam height changes, these drawings will have to be revised.
Stand detail draws are complete. Assembly draws next.
Alignment
Virgil Bocean:
Please see the attached file [not yet posted] containing:
- The E907 beam absolute elevation (height) in MC7 as per yesterday‚s installation meeting (80.5 inches above the average of 50 feet of floor heights on beamline immediately upstream of the concrete pad).
- The floor height survey on the MC7 concrete pad (5 ft grid).
- The thickness of the grout/concrete pour under the two analysis magnets based beam height, floor elevations, and magnets half size from drawings.
All the elevations are in the Fermilab absolute height system and in inches. Please let me know if you need more details and/or information.
Peter Barnes:
Thanks for forwarding the measurements. A couple of items:
- I think there is an error in the formula for the leading edge (i.e., 6' position for JGG) grout thickness for each magnet. The formula refers to the down stream elevation in column D, not the upstream elevation in column B
- I'd like to see the entire data set, not just the pad.
- It looks like the largest effect is a systematic tilt, -0.1 in per 5 ft down the beam line. The next largest effect is a bowl centered on the beam at the downstream end, under Rosie.
- So, we need to raise the beam at least 0.5 in, to get some grout under JGG, correct? This will leave 0.228 in at the thinnest spot.
Virgil Bocean
I attached the file [not yet posted] containing the results of the entire MC7 floor height survey.
Besides the raw survey data set, in the other worksheets I summarized:
- The floor elevations along the beamline throughout the enclosure, including the (highlighted) points considered for the computation of the beam height, and also a longitudinal profile.
- The elevations of the concrete pad in 5 ft spacing grid pattern. A couple of details: the length of the concrete pad is 46 ft, our crew measured the first raw of points starting with the downstream edge so, going in 5 ft increments, 1 ft is left at the upstream. Please note that the highlighted columns for the JGG and Rosie represent only the general area where the two are located, but cover their base plates footprints (7.25x16 ft and respectively 5x15.20 ft). More precisely, the stations of the upstream/downstream base plates for the two magnets with respect to the upstream edge of the concrete pad are: JGG 7.26ˆ14.51 ft, and Rosie 28.49ˆ33.49 ft. If needed, one can obtain better values for the thickness of the grout/concrete pour under the two analysis magnets by interpolating between the grid points. Thank you, I already corrected the formula in column L (which I forgot to update after switching some columns around to make the worksheet more compact).
- The floor elevations upstream and downstream of the concrete pad in a similar 5 ft spacing grid pattern. Please note that the cross sections measured at beamline survey points 61 and 15 are adjacent upstream, and respectively downstream, to the concrete pad.
If we need to raise the beam height to get some grout under JGG, now is a good time to decide.
In support for the installation of the experiment, we completed today:
- The layout of the E907 (in fact E871) beamline in MC7 (including checking the existing control points, and providing a reference chalk line throughout the entire length of the enclosure).
- The layout of the two analysis magnets base plate footprints.
Please let me know if you need more details and/or information.
Virgil has marked the location of both analysis magnets on the MC7 concrete slab.
Ellie Arroyo:
The E907 [budget codes] have been established and are ready to use.
The next call will be Thursday, 18 April, at 3:00 CDT in WH 11SW.