Yesterday Grant Minor (me), Maico Dalla Valle, Dan Louie, and Arthur Leung worked with Operations to perform the Cyclotron Lid-Up task for the 2014 winter maintenance.

Work Permit 2014-01-22-2 was issued for this job.

In general, the lid up operation was rough at the beginning.  The system began to trip-out within about 500 counts on the mechanical counter, just when the jacks started taking the load, then continued to trip within the first ~ 3 inches of travel.  Multiple station jogs, complete lowerings, and complete raisings were required to get beyond the rough spot. 

I tried as best as possible to record the mechanical counters for each trip event, as well as confirm the master synchro count and culprit station with Arthur.  The data I collected is summarized below:

Start of Operation: All stations were indexed with yoke gaps within .005" and .010" of the .250" nominal shim stock (see previous e-logs).  Mechanical counters were all set to 100 counts (each count is approximately .001").

1. First lid up attempt tripped at less than 1" of travel.  Station 9 was found to be lagging adjacent stations.  It as jogged in local mode as shown:

2. Lid was raised again and stalled.  Station 11 was found to be lagging and was jogged:

3. Lid was raised again and stalled.  The decision was made to lower completely and raise again.  All station counters were recorded before lowering:

4. Lid stalled on the way down.  Station 9 was found to be lagging and was jogged:

5. Lid was lowered completely and then raised again.  It tripped at Station 9.  It was examined and found not to be lagging a great deal.

6. System was reset and lid was raised further.  It continued to trip.  Station 9 was examined and not found to be out.

7. Lid was lowered completely and then raised again.  It tripped again, and Station 9 was found to be out.  It was jogged with some intentional overshoot.

8. Lid was raised again and tripped.  The decision was made to lower lid completely.  Some counter values were recorded when the lid had reached the lower limit, for comparison to the starting reference.

9. Lid was raised again and traveled more smoothly until tripping at around 850 counts.  6 counter values were recorded.  Station 9 was found to be lagging and was jogged:

10. Lid was raised again and tripped.  Station 9 was found to be lagging and was jogged:

11. Lid was raised again and tripped.  Station 9 was found to lag very slightly (but within the normal variation band), and was jogged:

12. Lid was raised further and tripped again.  Four of the counters recorded and the group broke for lunch (approximately 1 hr).  The lid was left at this position over lunch.

13. After lunch, the lid was raised up to about 1090 counts with 4 trips.  Counters were read as below:

14.  Lid was raised but tripped almost immediately.  Decision was made to lower again.  Counters at bottom limit were read again:

15. Lid was raised with 3 trips.  Station 9 was found to be lagging and was jogged:

16. Lid was lowered completely, then raised.  It went up fairly smoothly and tripped out at about 1350 counts.  All counters were recorded:

17.  A few more attempts were made to raise the lid with a few more trips.  The system traveled in longer bursts and more smoothly between trips.  Counters were recorded and stations 9 and 11 were jogged:

18. System was reset and lid was raised again with a few more trips close together.  The decision was made to lower the lid completely and raise again.  Master synchro was recorded at 2285 before lowering.

19. Lid was lowered completely and raised fairly smoothly up to a master count of 2363 before tripping out on stations 1 & 9.

20. A few attempts were made to lower the lid slightly (not all the way) and then raise again.  This did not seem to reduce the frequency of trips.  The system tripped out around 2820 and all counters were recorded before taking a short break to allow the contactors to cool down:

21. After the break, there was a raise and lower cycle within about 3600 counts that I was not present for.  When I had returned the system was still rising in small bursts and tripping out on station 9 mostly.  Over a span of 5 trips, Station 9 was jogged 5 times by between 20 and 50 counts, with 20-count overshoot.

22. The master synchro passed 3600 counts and then the system tripped.  Stations 9 and 10 were recorded and Station 9 was jogged:

23.  The master passed 3800 counts, and then they system went up smoothly for the first time by about 1500 counts before stopping. Some counters were recorded:

24.  Lid was raised again and stopped around 6350.  The group paused to check the tank seal and all counters were recorded:

25. The lid was raised further with 2 trips at station 9.  Stations 9 and 10 were checked and station 9 was jogged:

26. Lid was raised again with 2 trips initially and then smooth travel up to a Master count of 9600.  After 3 more trips and resets, I began recording just the station trips and master counts at each trip.  No jogs were required during this period.

27. Jacks 1 & 5 tripped at 10,200 counts on the master.

28. Jacks 1 & 9 tripped at 11,500 counts on the master.

29. Jack 9 tripped at 13,400 counts on the master.  Several trips occurred immediately after this.  Counter readings were taken and station 1 was jogged:

30. Lid was raised again with trips at station 1, 5, 7 & 9.  Master synchro count was 15,600.

31. Lid was raised again with trip at stations 1 & 7.  Master synchro count was 18,800.

32. Lid was raised again with trips at stations 5, 7, and 9.  Master synchro count was 21,650.

33. Lid was raised again with trips at stations 1, 3, 5, 7, 9, 11.  Master synchro count was 23,360.

34. Lid was raised again with trips at stations 1, 5, 7, 9. Master synchro count was 23,700.

35. Lid was raised again with trip at station 9.  Master synchro count was 25,420.

36. Lid was raised again with trip at station 7. Master synchro count was 27,700.

37. Lid was raised again with trip at station 5.  Master count was 27,700.

38. Lid was raised again with trip at station 7. Master count was 30,300.

39. Lid was raised again with trip at stations 1 & 3. Master count was 33,650.

40. Lid was raised with trip at station 7.  Master count was 37,400.

41.  A moaning / groaning noise was heard from the structure around 38,000 counts.  This noise was also observed during the 2013 lid-up.

42. Lid was raised with trip at station 7. Master count was 39,722.

43. Lid was raised with trip at station 1.  Master count was 41,600.

44. Lid was raised with trip at station 9.  Master count was 42,857.

45.  All counters were read and selected stations were jogged:

46. Lid was raised but tripped at station1.  Station one count was found to be behind and was jogged from 42,804 to 42,880.

47. Lid was raised until limit switches were contacted.  All final counter readings were recorded:

***

Photos of the limit switches and the reference "stick" relative to the roof beam are attached.  The stick appears to be between 1/16" and 1/8" clear of the roof beams.