======================================================================== Date: Mon, 24 Feb 2003 11:44:34 +0900 (JST) From: Samo Stanic Subject: RTDs inside W shield For complete information, here are the details about RTD sensors inside the W shield: LER (long) side: -------------! ----------- ! !---------- ! ! L1 L2 L3 L4 L5 ! !---------- ! ^ ----------- ! 0 -------------! Distances from beginning of W mask L1 11cm L2 16cm L3 21cm L4 26cm L5 29cm --- Close to cooling tubes, where no W mask is attached: L6 after Cu cooling block, In L7 2 cm before flange, In HER (short) side: !------- ! -------- ! ------! ! H4 H3 H2 H1 ! ! ------! ! -------- !------- Distances from beginning of W mask H1 8cm H2 13cm H3 18cm H4 21cm --- Close to cooling tubes, where no W mask is attached: H5 after Cu cooling block, Out H6 2 cm before flange, Out All sensors were tested and were found to be working after the masks were attached. -- Samo Stanic High Energy Accelerator Research Organization (KEK) ======================================================================== Date: Wed, 26 Feb 2003 20:56:49 +0900 From: Junji Haba Subject: Clearance of Monitor sensor Dear SVD Monitor friends: I put the figure which shows the clearances of the position where the monitor hybrids are located on the beam pipe. http://habapmac.kek.jp/svd2/Mechanical/monitor_hybrid_clearance.pdf We finally decided to place them at the following postions; FWD: IN horizontal at the cooper cooling block, (Clearnace to SVD cooling pipe is minimum) OUT-upper 60deg at the PF manifold, OUT-lower 60deg at the PF manifold. (Clearance to SVD hybrid is minimum) BWD: OUT horizontal at the copper cooling block, (Clearance to colling pipe of SVD is minimum) IN upper 60deg at hte PF manifold, In lower 60deg at the PF manifold. (Clearance to SVD hybrid is minimum) We gave up to have the sensors in front of the manifolds (original design) beacuse the position of either the monitor hybrid kapton film or the flex of the SVD ladder are not well-shaped with the precision better than 1 mm. Regrads; Haba ======================================================================== Date: Wed, 26 Feb 2003 22:27:56 +0900 From: Toru Tsuboyama Subject: SVD2 Radiation hybrids and RTDs were installed today Today, we (Stanic, Terazaki, T. Abe, Tsuboyama and new Tajima) installed all the radiation monitor hybrids and RTDs on the beryllium chamber. Unfortunately, we could not install the hybrids to where Zontar and Yamada originally designed, due to lack of clearance between SVD ladders and monitor hybrids. After intense discussion including Haba and Koike, we decided to mount hybrids on top of manifolds. Horizontal ones were still close to DSSD hybrids so they were put on the cooling blocks behind the manifolds. Although we were somewhat disappointed, we proceeded. At last we put 6 hybrids and 6 RTDs on the beryllium chamber as follows. Details positions and photos will be sent later. Forward 0 degrees #1 On the cooling block Forward 120 degrees #7 On the manifold Forward 240 degrees #8 On the manifold Backward 60 degrees #4 On the manifold Backward 180 degrees #6 On the cooling block Backward 300 degrees #2 On the manifold RTDs Be-1 90 10 mm from the backward manifold edge Be-2 150 38 Be-3 210 71 Be-4 270 104 Be-5 30 165 Be-6 330 137 Be-1,2 and 3 are read out from the backward region Be-4,5 and 6 are read out from the forward region. Best regards, Toru Tsuboyama Physics department, KEK ======================================================================== Date: Wed, 26 Feb 2003 16:25:56 +0100 (CET) From: Dejan Zontar Subject: SVD radiation monitors Dear Haba-san and Tsuboyama-san I first heard from Samo and then read on the mailing list that instead of at the designated position in front of the manifold the monitors have been mounted partially on an partially behind the manifold. I would like to point out that I am very unhappy with this last-moment change of the design. It was agreed long ago that in SVD 2.0 radiation monitors would be an integral part of the SVD design, with positions planned for and determined in advance. In line with this decision, a few months of planing, designing and re-designing, coordination and careful fitting has been spent. We have been warning with Yamada-san that the space is very tight and a few times I proposed to abandon the idea of 6 L1 monitors and replace it with 3, which could be fitted much more easily. However, the proposal has always been rejected so finally we came up with a design that should, though very tightly, fit into the available space. The design was finalized more than a year ago and was also available on the web. It should provide good angular coverage and information about the radiation field at low radius, enabling systematic studies of the radiation field in the low-radius beam-pipe environment. However, the subsequent additions to the beam-pipe and the consequent severe changes in positioning completely discarded all the previous decisions and efforts and repeated the previous practice of placing the monitors at any available space, which will make systematic studies of the radiation field much more difficult. Best regards, Dejan Zontar ======================================================================== Date: Thu, 27 Feb 2003 12:58:35 +0900 From: Junji Haba Subject: Re: SVD radiation monitors Dear Dejan; I like to say some remarks for the change. Major worry is very tight clearance between the flex and the monitor sensor as you know. We made a test seembly of the monitor sensor on the dummy beam pipe and found that the total extension of the tip of sensor is 11mm from the wall of the manifold (including thickenss of gold attached and its glue, this might not be considered in the discussion between you and Yamada). We also found that the sensor thickness including glue can be as much as 1.8 mm. With these consideration we checked the clearance between the flex (positioned as designed ) and the tip of the sensor. It was found that the minimum clearance is 1.5mm. Many times we have been warned that the flex should not be bent-down below the level of the DSSD and the assembled L1 mcuh or less satisfied the condition (This requirement is essential to avoid a possible interference among ladders with overlap. ) Instead the flex is positioned outward by 1 -1.5 mm from the original drawing. As You konw a flex circuit is FLEXible and the only thing we can do to control its length. It's VERY difficult or almost impossible to keep the desired shape of the flex with two constraints at the same time. Thus there are no clearance here. Further uncetainty is that your sensor would be attached extending outward from the base of manifold (I don't know why this strange design could be approved by the monitor group. As for me I thought by the alst moment that your sensor would be fitted with the base in width) The extension (no support beneath) may cuase additional bent-out. Let me remind you that the smallest clearance between the DSSD of L1 and beam pipe is designed to be about 3mm (FWD outside) and obviously we should have that much clearance everywhere. That is why I asked the monitor group working here to move the sensors. Even with the modification proposed by you (cut by 2mm), it seems not enough for me and not the right choice taken in rush at the last moment. Please don't blame anyone even if it should be true this could be foreseen much earlier. Poor communication among us was the problem. We should avoid a similar things to hapne in future when the components made by separate groups are assembled into one. Dejan Zontar wrote: > However, the subsequent additions to the beam-pipe and the consequent >severe changes in positioning completely discarded all the previous >decisions and efforts and repeated the previous practice of placing >the monitors at any available space, which will make systematic >studies of the radiation field much more difficult. > > > You are right. A systematic and consistent design and preparation are what I'm asking the monitor group. Best wishes; Haba ======================================================================== Date: Thu, 27 Feb 2003 22:17:41 +0900 From: Toru Tsuboyama Subject: some monitor cables were broken ... but repaired Dear colleagues, We (Nakano, Terazaki and Tsuboyama) soldered all the connectors to the RTDs which were installed yesterday. The practice of IP chamber transfer has started and the IP chamber is now supported with V-shape blocks at forward and backward tungsten masks. We inserted vinyl bubble sheet to protect monitor cables. However, after we started the soldering, we found some RTD cables were broken. In the end, we found one hybrid cable was also broken. Fortunately, after 3-4 hours efforts, all the broken cable were fixed I think all the hybrids and RTDs are now healthy. The hybrid uses a 0.5 mm-pitch 24-wire cable and repair was done with 0.3mm diameter wire. I am not 100% sure all the wires will be healthy until installation. We gave up to fix cables until the chamber is mounted on the transfer cage. Best regards, Toru Tsuboyama ======================================================================== Date: Mon, 3 Mar 2003 17:00:11 +0900 From: Yoshikazu Yamada Subject: RE: SVD radiation monitors Hello I am sorry that the monitors could not be attached in the designed position. I did not know the change of the position since I was in USA/Canada last week. In my drawing, the gap between the FLEX and the monitor is about 2.5 mm if monitor thickness is 2 mm and the extension of the tip of sensor is 10 mm (not 11 mm). Since the 2.5 mm is larger than the required minimum clearance of 1 mm (not 3 mm) between SVD and the beam pipe, I agreed the position. (The clearance between the end ring and the Cu cooling block of the beam pipe could be 1 mm.) However, the 300 micron thick gold and its glue was not included in the drawing because it was not well defined at that time. I warned Haba san that the FLEX should be in the shape same with the designed one in order to avoid the interference not only between them each other but also with the beam pipe. However, he said it is impossible and it is OK even if the FLEX touches the beam pipe because it is flexible. Thus, I stopped warring further and forgot this thing. Finally, the clearance might become less than 1 mm due to the FLEX shape, misalignment of the beam pipe and the thickness of the gold and glue. I had to be more careful and conservative about the clearance. Regards, Yoshikazu Yamada Institute of Particle and Nuclear Study High Energy Accelerator Research Organization (KEK) ======================================================================== Date: Mon, 3 Mar 2003 20:53:39 +0900 From: "Nakano Yuuki --Dear colleagues, 27 Thu 2003, we installed 6 radiation monitor hybrids. 28 Feb 2003, Terazakisan and I measured the position of each sensor. B60, B300, F120 and F240 hybrids are put on the cooling manifolds. B180 and F0 are put on the cooling blocks. The positions are shown in degrees (out-horizontal is 0). Measurement error will be 5 degrees. backward B60 B180 B300 RTD 83 213 341 P1 74 205 332 P2 64 193 322 F1 54 182 311 P3 33 158 290 P4 25 147 282 F2 16 138 274 forward F120 F240 F0 RTD 95 197 318 P1 100 205 328 P2 110 215 339 F1 122 224 353 P3 143 245 15 P4 150 251 29 F2 160 262 36 RTD--- Temperature sensor P1-P4 -- PIN diodes F1-F2 --- RADFETs Best regards, Y. Nakano ======================================================================== Date: Tue, 4 Mar 2003 13:42:01 +0900 From: terazaki@asanolab.bk.tsukuba.ac.jp Subject: Monitor hybrid Dear colleagues, We, SVD monitor group, finished mounting monitor hybrids. All of sensors can be used. we're glad that all RadFETs are alive because static electricity sometimes kills them. The following tables shows the status of sensors. (Two RTDs should be read out in 3-wire mode, since one of four wires is broken.) Each hybrid has four PIN diodes. The functions of each PIN diode was also confirmed. ======================================================================== Position(degree) RTD PIN diode RadFET's output(V) ch5 ch6 ch7 ch8 ------------------------------------------------------------------------ Foward 0 3-wire alive 9.57 9.57 9.58 9.56 Foward 120 alive alive 9.58 9.58 9.56 9.49 Foward 240 3-wire alive 9.62 9.61 9.58 9.58 Backward 60 alive alive 9.62 9.87 9.58 9.58 Backward 180 alive alive 9.57 9.57 9.58 9.56 Backward 300 alive alive 9.70 9.69 9.55 9.54 ------------------------------------------------------------------------ In addition, all individual RTDs are also alive. ------------------------------------------------------------------------ Forward Tantalum 7 Forward Beryllium 3 Backward Tantalum 6 Backward Beryllium 3 ------------------------------------------------------------------------ The six sensors on the beryllium cover 6 positions in Z and 6 angles in phi with equal pitch. Best regards, Terazaki Hideaki ======================================================================== Date: Mon, 17 Mar 2003 12:18:44 +0900 From: Nakano Yuuki Subject: MOSFETs & PIN diodes Dear colleagues, On 11 March, We (Tsuboyama san & I) checked the MOSFETs for the SVD2 with the MOSFET reader made by Wollongong Univ. The result is as follows. connector RF1 RF2 RF3 CH# PIN# position (V) position (V) position (V) 1 1 F-L1-0-1 (9.5) F-L1-120-1 (9.5) F-L1-240-1 (9.6) 2 2 -2 (9.5) -1 (9.5) -2 (9.5) 3 4 -3 (9.5) -3 (9.4) -3 (9.5) 4 5 -4 (9.5) -4 (9.5) -4 (9.5) 5 7 L2-0-1 (-13) L2-120-1 (9.5) L2-240-1 (9.5) 6 8 -2 (-13) -2 (9.5) -2 (9.5) 7 10 L3-0-1 (9.6) L3-120-1 (9.3) L3-240-1 (9.6) 8 11 -2 (10.7) -2 (9.6) -2 (9.7) 9 13 B-L1-60-1 (9.6) B-L1-180-1 (9.6) B-L1-300-1 (9.7) 10 14 -2 (9.9) -2 (9.6) -2 (9.7) 11 16 -3 (9.6) -3 (9.6) -3 (9.6) 12 17 -4 (9.6) -4 (9.6) -4 (9.6) 13 19 L2-0-1 (9.7) L2-120-1 (-13) L2-240-1 (10.3) 14 20 -2 (9.7) -2 (9.6) -2 (10.4) 15 22 L3-0-1 (9.5) L3-120-1 (9.6) L3-240-1 (-13) 16 23 -2 (9.5) -2 (9.6) -2 (-13) Here RF1, 2 and 3 are cables for the RADFET reader made by Univ. Hawaii used in the experiment. Channels 1-8 are for the forward and 9-16 are used for the backward RADFETs. We think F-L2-0-1,2 ,B-L2-120-1,B-L3-240-1,2 are broken. On 13 March, we checked PIN diodes. We applied power supply to the preamplifiers and observed the noise level from each channel. (Unfortunately, we have no space to install LED light pulser) We confirmed noise levels are all reasonable. We also checked the connection for the ADC readout. The result is as follows. ADC ADC 1 F-A-1 2 F-M-1 3 F-A-2 4 F-M-2 5 F-A-3 6 F-M-3 7 F-A-4 8 F-M-4 9 F-A-5 10 F-M-5 11 F-A-6 12 F-M-6 13 B-A-1 14 B-M-1 15 B-A-2 16 B-M-2 17 B-A-3 18 B-M-3 19 B-A-4 20 B-M-4 21 B-A-5 22 B-M-5 23 B-A-6 24 B-M-6 25-34 No connection. Here, F and B mean forward and backward, A and M mean the channel is used for abort and measurement and 1-6 corresponds to the hybrid channels. The connection to the abort module is CH Cable1 Cable2 1 F-A-1 B-A-1 2 F-A-2 B-A-2 3 F-A-3 B-A-3 4 F-A-4 B-A-4 5 F-A-5 B-A-5 6 F-A-6 B-A-6 7 No connection 8 No connection as we expect. Best regards, Y Nakano (Tsukuba U.) ======================================================================== Date: Fri, 25 Jul 2003 11:09:56 +0900 From: Toru Tsuboyama Subject: Remaining jobs for SVD2. Remaining jobs for SVD2 monitor are as follows o Connect monitor cables to SVD2 o Connect cooling tubes to SVD2 o Prepare about 150 liter of purified water o Connect monitor cable to DATA loggers inside E-Hut. o Reconstruct the electric connections inside E-hut. Screwing cables to IOTECH cards. Digital cables between IOTECH and some modules. o Migrate the SPARC-GPIB program to PC-Linux. o Install the new abort hardware. A new abort module A PCI card for recording the abort pattern A new PCI ADC card for recording PIN diode analog pattern Programming in Windows environment. (The ADC card has only PC driver) The saved data will be converted to html data somehow. o Power supply interlock/reset module. A new PCI card for detecting/resetting errors in the SVD power supply. Programming on PC-Linux. o Data logging program. NSM -> Database Database -> Ntuple (root file?) conversion Ntpule (root file?) -> html conversion Best regards, Toru Tsuboyama ======================================================================== Date: Mon, 1 Sep 2003 12:08:20 +0900 From: Toru Tsuboyama Subject: RE: Another visit to KEK Remaining jobs 1) Confirmation of connections of monitors. The monitor cables are connected to the SVD monitor sensors. Does anyone help to measure and confirm the monitor sensors inside the E hut? The cables will be fixed inside CDC wall so that the cables do not come off the connectors. 2) Water circulation We have not started the circulation of water for beam pipe and SVD end rings. The commissioning will start this afternoon. 3) Rearranging the paraffin tube. We found the air inside the paraffin tube remains since the velocity of paraffin in 3/4 inch tube is extremely slow. Since the tubes around the beryllium chamber is narrow, air can be purged with paraffin flow. The normal operation is not affected by the air. However, in order to operate the circulation system more stably, we would like to purge the air. For this, we will add a "T" connector at the highest point close to the IP chamber and purge air from the port. ======================================================================== Date: Fri, 5 Sep 2003 22:21:32 +0900 From: Toru Tsuboyama Subject: Circuit Dear colleagues, I made circuit diagrams for the important modules for the SVD2 monitor. I followed D. Zontar's explanations in http://www-f9.ijs.si/~zontar/Belle This schematics are really useful when we construct the monitor software. The abort module has been improve by Stanic and the schematic is rather obsolete. I am sad since the schematic of the monitor connection box, when printed, is unreadable to me. Tell me if there are corrections. ======================================================================== Date: Mon, 8 Sep 2003 19:00:37 +0900 From: Toru Tsuboyama Subject: Jobs this week: Integration of monitor system. Dear colleagues, I am sorry I forget to bring my PHS to KEK. I think it is the time for the abort decision module to be connected to a windows PC and debugged. (Stanic confirmed the analog functions last week.) The digital IO board has a windows driver program and a GUI program for test. I connected all RTDs to IOTECH. I found some RTDs are not stable. It means, I should check the white flex cable inside CDC and, if we are lucky, establish the good connection again. If I fail, we should read out them in 3-wire mode. Another job is to think about "which radiation sensor is connected to which IOTECH channel." We have a complete summary of the electric connections( http://www-f9.ijs.si/~zontar/Belle/distr_box_20.html ), however, we do not have a table for the geometrical positions of radiation sensors). Dear Stanic, if you have already started, please go ahead. Last week, Stanic debugged the RTD box and we are ready to start the test of PF200 sensor. The strain gauge on the backward IP chamber support were healthy on last Friday. Nakano can start the data acquisition program. Best regards, Toru Tsuboyama ======================================================================== Date: Wed, 17 Sep 2003 22:04:20 +0900 From: Toru Tsuboyama Subject: Important job Dear Stanic, I forgot a very important issue. The positions of the hybrid sensors. Each large hybrid has 2 FETs, 4 PINs and 1 RTD. The hybrids were glued on the manifold of the IP chamber. At the end of radiation hybrid installation, Nakano and Terazaki measured the position (angle) of each sensor (The result should be written in the SVD-monitor log notebook). However, we do not checked which sensor is connected which channel of IOTECH. I assigned names to IOTECH channel in "Hybridbox.BMP", however, the names are very doubtful. Electrical relationship between the hybrid, white cable, connector card and hybrid signal distribution box should be more or less correct. The hybrid circuit shown in "cables.BMP" shows the geometrical information of sensors. I think it is possible to follow the photos, log books and circuit schematics and finally solve the above problem. Samo, could you try this difficult job? Best regards, Toru Tsuboyama ======================================================================== Date: Thu, 18 Sep 2003 15:21:25 +0900 From: Toru Tsuboyama Subject: Log book. Dear colleagues, I had a chance to read the Monitor log book. I guess Nakano and Terazaki recorded the positions of the sensors of large hybrids. Let the order of sensors in each hybrid be RTD-PIN1-PIN2-FET1-PIN3-PIN4-F2, (I regret we did not assign parts number on the hybrid Kapton circuit.) then position of several sensors were measured to be F---0 hybrid (on the block) P1--330 degrees, P4----30 degrees F-120 hybrid (on the manifold) P2--120 degrees, P3---150 degrees F-240 hybrid (on the manifold) P2--210 degrees, P4---240 degrees B--60 hybrid (on the manifold) RTD--85 degrees, FET1--60 degrees B-180 hybrid (on the block) P4--150 B-300 hybrid (on the manifold) P2--330 I guess Samo has a similar information. I think you can inter- amd extrapolate the data to determin the positions of all sensors. Best regards, Toru Tsuboyama ======================================================================== Date: Thu, 18 Sep 2003 18:56:17 +0900 From: Toru Tsuboyama To: Stanic Samo Subject: Circuit schematic I forgot to explain "what signal we should send to Ikeda san. If you have not finished, please take a look at the attached diagram. The outputs of PIN diodes are summed with 10kOhm and 1Kohm resister the summed data is introduced to the analog driver MAX (I forgot the exact name). The differential output is connected to the cable after 50 Ohm resistor. Explanation ----------- By 10kOhm and 1Kohm resister, the signal is divided by about 10. Since we add 10 such signals, signal at MAX???? input is about the average of all inputs. The MAX???? amplifies the voltage with gain 2. There are 50 Ohm resisters in Out+ and Out- line. Since the impedance of twisted pair cable is about 100 Ohm, the voltage at the cable is about 100/(100+50+50)=1/2 of the (Out+ - Out-) voltage. Since the amplifier gain is 2, the voltage at the cable is same as the input voltage. The length of cable is about 2 km and signal arrives at Ikeda san's data logger. In SVD1.6, the Nakano's circuit successfully transferred the analog signal. By the way, you improved the PIN abort module significantly. Please modify the circuit schematic according to your modification. (You can ask Nakano to run the program.) Best regards, Toru Tsuboyama ======================================================================== Date: Mon, 22 Sep 2003 21:33:02 +0900 From: Samo Stanic Subject: works today Dear monitoring experts, Last week Tsuboyama san and I set thresholds for individual PINs to fire abort at -3V for all 12 PINs. We measured that each fired PIN contributes 0.3V to the summed signal at second stage comparator. The second stage comparator was set so that abort signal will be issued if there are >2 PINs over the threshold (at 0.7V). All this can be done easily by using the Abort module front pannel potentiometers and the built-in voltage meter. Today Tsukuba U. group did some concluding monitor related works in Ehut. - we set time constant of all 12 low pass filters in the Abort module to 800us using step pulse generator and oscilloscope. Necessary outputs are already included in the module so it was only necessary to connect the generator and oscilloscope, and to set the resistors to the correct values. - we confirmed that Ikeda (KEKB) will be able to see our PIN signal we will be sending to the KEKB abort logger by sending a signal from pulse generator instead - we started to work on the software which will drive the digital part of the Abort module (i.e. read out the configuration of PINs that fired at abort). Hardware functions were confirmed to be working last week. - we brought the parafin leak sensor module, which should be connected to "MISC." connector of the RTD distribution box. Outputs from this module are (1) leak sensors, (2) strain gauges. In the case of leak sensors, I added a switch to switch off the 100mA heater current when not necessary (so that there is no need to pull out the crate). - we labeled all yet not labeled modules and boxes with TEPRA One more thing: I noticed that the noise on low gain PINs (on the oscilloscope) is now less than last time I was at KEK (on Friday when we set the abort thresholds with Tsuboyama san). Ushiroda san suggests it is because the endcaps are now closed. Best regards, Samo ======================================================================== Date: Tue, 30 Sep 2003 12:39:23 +0900 (JST) From: Samo Stanic Subject: Strain Gauge Reader Yesterday we connected the strain gauge reader (PCD-300) to the Strain Gauge/Parafin Leak NIM Module. This module is connected to Misc. Connector of the RTD Distribution Box. Connection of the strain gauge part is as follows: Sensor Misc.con. Stain gauge PCD-300 loc. pin # con. pin # input # ----------------------------------------------------- UP-H 25 1 Channel 3 - A UP-H 26 2 Channel 3 - B UP-V 27 3 Channel 3 - B UP-V 28 4 Channel 3 - C DN-H 29 5 Channel 4 - A DN-H 30 6 Channel 4 - B DN-V 31 7 Channel 4 - B DN-V 32 8 Channel 4 - C -- Samo Stanic ======================================================================== Date: Tue, 30 Sep 2003 17:01:03 +0900 From: Toru Tsuboyama Subject: SVD monitors on WEB. The SVD2 monitor data is now displayed on web. I personally hate "password" system. Therefore I had to put the monitor data in my account. The pictures below are updated every 15 minutes. http://bsrv.fblocal.kek.jp/~tsuboy/svdmonitor/index.html (Inside KEK) The pictures below are somewhat delayed. http://belle.kek.jp/~tsuboy/svdmonitor/index.html License free PNG format is used for those graphs. Comments on the monitor data. o Chiller water temperature was changed at 10:00 29 September. Water temperature for DOCKs: from 20.0 to 16.0 C Reason: REBO temperatures exceeded 40 degrees. Water temperature for end rings and the IP chamber: from 16.0 to 14.0 C Reason: To improve the VA1TA performance, if any. o (Water stopped for 4 hours in the afternoon of 29 Sep. Strainers were inserted to the water line. Since we realized dusts blocked the DOCK3 tubes, a filter with ~5um has been operated in parallel to the water loads. Since the flow rate is 3 liter/minutes, almost all dusts must be filtered out already. o The strain gauge data was reset on 29 Sep afternoon. The spaghetti cable was replaced with a new connection module. The range of strain gauge read out module was <200ppm and the "upper" sensor exceeded the limit. The readout of the upper gauge is still drifting. o Stanic found the noise level of PIN system decreased since the IP chamber was connected to the accelerator chambers. Temperature dependence seems to be small. (We should see the result when beam is on). o Paraffin circulation system is working at 1.5 liter/min. The pressure at entrance is ~0.06 MPa and pressure drop is 0.08 MPa. which is within the rating of the chamber. o Water contamination in paraffin (Humidity) is 6% (relative-humidity- in-air equivalent). This value corresponds to 1.2 ppm contamination in paraffin (See note below). Besides this value, since the vapor pressure is far less than the saturation, there are little chance of water condensation in this system. o Temporary YAMADADA value is "AVERAGE of beryllium chamber temp(6 RTDs) - AVERAGE of manifold tempereature(6 RTDs)". The definition will change after we observe data. Note: The 1% RH at 18 degreesC in air corresponds to 0.00013 (g/g) absolute humidity. Since the density of the air and the normal-paraffin is 1.2 and 750mg/cm3, a 1 % RH equivalent corresponds to 0.21 ppm in paraffin. Best regards, Toru Tsuboyama ======================================================================== Date: Fri, 17 Oct 2003 15:34:23 +0900 From: Toru Tsuboyama Subject: Paraffin leak sensor. The paraffin-sensor data is now available on line. voltage[88] ---- Paraffin sensor for forward voltage[88] ---- Paraffin sensor for backward Their entries in N-tuple is nt/pl 10.beamint(5) --- Forward paraffin monitor nt/pl 10.beamint(6) --- Backward paraffin monitor It may take some time until the sensors become stable. Best regards, Toru Tsuboyama ========================================================================