Survey 2002 Part II

Survey RUN-3

F.Videbæk

Analysis Note XX

March 29, 2003

The survey analysis for the RUN-3 has just started. The survey was done before the run but apart from the TOF2 slats nothings so far has been put into the database as of March 29.The note is basically written by taking the run-2 note and modifying as neede.

This note describes the procedure and I give a table which contains the first iteration on geometries that we should use. I recommend these get into the DB ASAP so we can look for difference in detail

Survey

The C-AD survey group carried out the survey during November 2002. The method employed were similar to the March 2002 survey also in terms of nomenclature.

Only tracking detectors and the move TOF slats were surveyed. It is assume that the other detectors as C1, RICH H1 and H2 and known accurately enough since they have not moved.

T3 is a good reference detector since it was not removed/re-installed between run-2 and run-3. All other tracking have been remounted, and repositioned.
TPC. As many corners of the Lucite box as possible was surveyed. This includes all 8 corners for MTP1 and MTP2, but fewer for T1 and T2. In addition T1 and T2 had some survey fixtures (1/2” markers) attached to either 3 or 4 positions on the top-plate; the positions are determined by a set of screw-holes.
DC. Various survey sighting balls were held on the survey positions, thus defining a point perpendicular to the survey marker and at a determined distance of ½, ¾ inch from the actual point. In some cases the survey ‘hole’ itself was sighted.
TOFW had 4 measurements per panel. Two at first and last slat at the edge, and at markers set top and bottom in the center of the slat. The markers were not placed symmetrically top and bottom, so those are only used to derive the x and z positions, not the height. The values derived is a grand average.
TOFW ha the first panel removed. In addition electronics for TOFW slats were later moved over to the TFW2 detector so depending on the run period various number of tow slats were present actively. The numbering though is unchanged, so a given slatno will in regard to geometry be determine as before (using the panel number).
The FS was surveyed at the nominal 4 deg position, while BFS was set at 11 for access reasons, not because we ever took any measurements there. It is unclear to me if the position was carefully set, rotating to 8 deg is close to the precious values but only to about 2 mm. The most important concern is the relative positions of T3-T4-T5 NOT the absolute and to T2.
MRS was measured for the TPCs at nominal 90 deg an the plate in nominal position. During the dA the plate was not move to the back position at all.
The TPM2 was move BACK by about 4 inches (as also reflected in the table) to make space for a MRS trigger counter (for Light HI and peripheral Au-Au).
T1 was also move somewhat closer to pivot by ~ 5 cm, to make space for a planned trigger counter. A same time it was attempted to push T1, and T2 as far towards the beam line as possible.
The were two independent survey of T2 apparently from different pos. The differences in Z,X in in the order of 1 mm indicating the accuracy.

In addition to the detectors many fiducial points of platforms, magnets and stands were recorded.

Analysis method

The data from the survey were put into spreadsheets based on the model used previous. The general idea is that say for the TPC with 8 corners measured one can construct 12 vectors, 4 in each direction x, y and z calculate units vectors, angles etc. From these one gets dimensions that can be checked as well as rotation angle, and center positions. Depending on the detector corrective terms (to adjust from external to internal centers are taken into account) The best center position and angles are evaluated based on these vectors, and position. In addition the spreadsheet will used dimension of the detector and calculate the positions of all corners, and a deviation from each measurement. This thus also enables one to check any different position, rotation that one might attempt to use e.g from software.

There are considerable changes in T1 an T2 geometry. The geometry for T3,T4 an T5 is quite close to that of last year.

The main change in MRS is the movement back by ~ 10 cm of TPM2.

Survey Summary

This first table gives the results as obtained from the survey directly, without any modifications to fine-tune geometries for the looking at tracking results. The Bold values are from run-3 the normal the RUN-2 surveys

All others from Run-2

Detector	#datapoints	x-center	z-center	Theta	y-center	Beta
		Cm	Cm	Degrees	Cm	Degrees
TPM1	8 6	94.90 95.13	0.13 0.13	90.10 90.03	--
TPM2	8 8	286.96 297.18	-0.11 -0.04	89.64 89.64
T1 (at 8deg) T1 (at 4deg)	4 4	-90.626 -54.98 *-89.92*	494.19 503.52 *488.46*	-10.03 -5.92 *-9.92*	Bottom==
T2 (at 8deg) T2 (at 4 deg)	3+3 at 4 rotate to 8	-151.36 -94.52 *-150.68*	799.55 808.39 *799.79*	-11.88 -8.30 *-12.20*	0.8 as before for bottom	--
H1	4	-164.36	857.57	-11.60	-0.4	~0
C1	6	-177.88	913.93	-11.94	-0.06
T3 T3 at 11 T3 rot to 8	8+1 8	-209.53 -265.34 *-209.33*	1074.14 1061.49 *1073.94*	-11.72 -14.72 *-11.72*	0.2 0.16	~+.1
T4	7	-297.50 -372.51 *-297.64*	1438.21 1420.84 *1438.39*	-13.55 -16.57 *-13.57*	0.22	0.018+-0.005
T5		-386.32 -372.51 *-297.64*	1781.1 1758.42 *1781.07*	-15.61 -18.62 *-15.62*	0.38	-0.1->-0.2
H2	4	-399.13	1838.65	-15.45	-0.1
RICH	4	-435.243	1963.36	-15.45	-0.05	0
TOFW	(at 90 deg position)
TFP1	REMOVED	425.083	-66.323	104.941	-0.10
TFP2	4	430.597 428.21	-41.084 -53.22	99.336 102.10	-0.22 -0.21
TFP3	4	433.557 432.43	-14.748 -27.11	93.094 95.91	-0.25 -0.10
TFP4	4	433.554 433.98	11.816 -00.745	86.903 0.00	-0.40 0.0
TFP5	4	431.033 432.69	38.256 25.63	80.762 83.69	-0.45 0.11
TFP6	4	425.162 428.21	64.098 51.73	75.236 77.89	-0.40 0.21

Database information

Temporary values for TPM2 i.e. incrementing the values from RUN-II by 10 cm is quite close to actual values. They

Comparison with tracking

TO be done

Final Geometry Values

Note done yet…

RUN-II table. For reference.

Detector	x-center	z-center	Theta	y-center	Beta
	Cm	Cm	Degrees	Cm	Degrees
T1	-90.5791 -90.626	494.1821 494.19	-10.0160 -10.03	0.8	0
T2	-151.3170 -151.36	799.5387 799.55	-11.90 -11.88	0.8	0
H1	-164.36	857.57	-11.60	-0.4	~0
C1	-177.88	913.93	-11.94	-0.06
T3	-209.5258 -209.53	1074.1440 1074.14	-11.6860 -11.72	0.35 0.2	0.35 ~+.1
T4	-297.4249 -297.50	1438.2377 1438.21	-13.5870 -13.55	0.2795 0.22	0.02 0.018+-0.005
T5	-386.2449 -386.32	1781.1240 1781.1	-15.6387 -15.61	0.2380 0.38	-0.1446 -0.1->-0.2
H2	-399.13	1838.65	-15.45	-0.1
RICH	-435.243	1963.36	-15.45	-0.05	0

Detector	x-center	z-center	Theta	y-center	Beta
	Cm	Cm	Degrees	Cm	Degrees
TPM1	94.90	0.13	90.10
TPM2	286.96	-0.11	89.64	Dy =0
TPM1+50	145.13	0.15	90.12
TPM2+50	337.13	-0.08	89.67	Dy=+0.2
TOFW
TFP1	425.083	-66.323	104.941	-0.10
TFP2	430.597	-41.084	99.336	-0.22
TFP3	433.557	-14.748	93.094	-0.25
TFP4	433.554	11.816	86.903	-0.40
TFP5	431.033	38.256	80.762	-0.45
TFP6	425.162	64.098	75.236	-0.40